g(m1)-ganglioside and Colonic-Neoplasms

Prominin 1/CD133 is a marker of transplantable cancer stem cells. We have generated anti-peptide antibodies against a N-terminal epitope of CD133 belonging to a ganglioside-binding domain. The labelling of colon cancer cells with these antibodies was inhibited by various gangliosides including GM1 and GD3, but not GT1b. CD133 immunolabelling progressively decreased to undetectable levels in post-confluent cultures, possibly through ganglioside-mediated epitope masking since the staining was partially recovered after chemical disruption of lipid rafts. We suggest that selected gangliosides could modulate the accessibility of CD133 and regulate cell-cell contacts involving CD133(+) stem cells at the earliest steps of tumour development.

Topics: AC133 Antigen; Amino Acid Sequence; Antigens, CD; Binding Sites; Biomarkers, Tumor; Caco-2 Cells; Colonic Neoplasms; DNA, Complementary; G(M1) Ganglioside; Gangliosides; Glycoproteins; HT29 Cells; Humans; Membrane Microdomains; Molecular Sequence Data; Neoplastic Stem Cells; Peptides; Protein Structure, Tertiary

A novel cytokine interleukin-27 (IL-27), composed of p28 and Epstein-Barr virus-induced gene 3 (EBI3), is produced from activated dendritic cells and is involved in an early phase of T-helper type I differentiation. We examined whether Colon 26 murine colon carcinoma cells that were retrovirally transduced with the p28-linked EBI3 gene (Colon 26/IL-27) could produce antitumor effects in inoculated mice. Although proliferation in vitro of Colon 26/IL-27 cells was not different from that of parent cells, syngeneic BALB/c mice rejected Colon 26/IL-27 tumors inoculated and subsequently acquired tumor-specific protective immunity. In contrast, mice inoculated with Colon 26 cells transduced with either the p28 or EBI3 gene developed tumors and survival of the mice remained the same as that of the mice inoculated with parent cells. Syngeneic nude mice developed Colon 26/IL-27 tumors, but the growth was retarded compared to that of parent tumors. Depletion of natural killer cells from nude mice with anti-asialo GM(1) antibody diminished the growth retardation of Colon 26/IL-27 tumors. Survival of severe combined immunodeficient mice that received subcutaneous inoculation of Colon 26/IL-27 cells was not different from that of the immunodeficient mice inoculated with parent cells. Interferon-gamma was produced from CD4(+) and CD8(+) T, and natural killer cells of the mice that rejected Colon 26/IL-27 tumors and cytotoxic activity against Colon 26 cells were also detected from the mice. These data collectively suggest that expressed IL-27 in tumors produces T cell-dependent and-independent antitumor effects and is a possible therapeutic strategy for cancer.

Topics: Animals; CD4-Positive T-Lymphocytes; CD8-Positive T-Lymphocytes; Cell Line, Tumor; Cell Proliferation; Colonic Neoplasms; COS Cells; Cytotoxicity Tests, Immunologic; Female; G(M1) Ganglioside; Genetic Therapy; Genetic Vectors; Immunity, Cellular; Injections, Subcutaneous; Interferon-gamma; Interleukins; Killer Cells, Natural; Mice; Mice, Inbred BALB C; Mice, Nude; Mice, SCID; Retroviridae; Transduction, Genetic

Flow-cytometric fluorescence energy transfer (FCET) measurements between fluorescently labeled cell surface MHC-I and ICAM-1 molecules indicated similar receptor patterns in the plasma membrane of interferon-gamma (INF-gamma)-treated colon carcinoma cells as those observed earlier at the surface of lymphoid cells. INF-gamma activation significantly increased the density of MHC-I and ICAM-1 proteins in the membrane. This increase in receptor density was accompanied by decreased proximity level of the homo-associated MHC-I receptors. Hetero-association of MHC-I and ICAM-1 molecules was increased by INF-gamma treatment. INF-gamma changed neither hetero- nor homo-association of transferrin receptors. By staining the sphingomyelin/cholesterol-enriched lipid microdomains with fluorescently labeled cholera toxin B subunit, we found an increase in the amount of lipid-raft associated G(M1)-gangliosides due to INF-gamma treatment. Confocal microscopic results and FCET measurements show that MHC-I and ICAM-1 are components of G(M1)-ganglioside containing lipid-rafts and also support an increase in the size of these lipid-rafts upon INF-gamma treatment.

Topics: Carcinoma; Cell Membrane; Cholera Toxin; Colonic Neoplasms; Flow Cytometry; Fluorescein-5-isothiocyanate; G(M1) Ganglioside; Histocompatibility Antigens Class I; Humans; Intercellular Adhesion Molecule-1; Interferon-gamma; Membrane Microdomains; Microscopy, Confocal; Protein Binding; Receptors, Cell Surface; Receptors, Transferrin; Tumor Cells, Cultured

Injection of dendritic cells (DC) engineered with recombinant adenoviral vectors to produce interleukin-12 (IL-12) inside experimental murine tumors frequently achieves complete regressions. In such a system the function of CD8(+) T cells has been shown to be an absolute requirement, in contrast to observations made upon depletion of CD4(+) T cells, which minimally affected the outcome. The aim of this work was to study the possible involvement of natural killer (NK) cells in this setting.. Depletions with anti-AsialoGM1 antiserum showed only a small decrease in the proportion of complete regressions obtained that correlated with induction of NK activities in lymphatic tissues into which DC migrate, whereas combined depletions of CD4(+) and NK cells completely eliminated the antitumor effects. Likewise in vivo neutralization of interferon-gamma (IFN-gamma) also eliminated those therapeutic effects. Trying to define the cellular role played by NK cells in vivo, it was observed that injection of cultured DC inside the spleen of T- and B-cell-deficient (Rag1(-/-)) mice induced upregulation of NK activity only if DC had been adenovirally engineered to produce IL-12. In addition, identically transfected fibroblasts also activated NK cells, indicating that IL-12 transfection was the unique requirement. Equivalent human DC only activated in vitro the cytolytic and cytokine-secreting functions of autologous NK cells if transfected to express human IL-12.. Overall, these results point out an important role played by NK cell activation in the potent immunotherapeutic effects elicited by intratumoral injection of IL-12--secreting DC and that NK activation under these conditions is mainly, if not only, dependent on IL-12.

Topics: Animals; Antibodies, Monoclonal; CD4 Antigens; Cell Separation; Cells, Cultured; Colonic Neoplasms; Dendritic Cells; Fluorescein-5-isothiocyanate; Fluorescent Dyes; G(M1) Ganglioside; Genetic Engineering; Glycosphingolipids; Granulocyte-Macrophage Colony-Stimulating Factor; Humans; Immunotherapy; Interleukin-12; Interleukin-4; Killer Cells, Natural; Magnetics; Mice; Mice, Inbred BALB C; Mice, Inbred C57BL; Neoplasm Transplantation; Neoplasms, Experimental; Transfection

Bovine lactoferrin (bLF), a milk protein known to have bacteriostatic properties was examined for its preventive effects on colon and other organ carcinogenesis and experimental metastasis. (Experiment 1) The influence on colon carcinogenesis was investigated in male rats treated with azoxymethane (AOM), then received 2 or 0.2% bLF for 36 weeks. Significant reduction in the incidence (27% and 46% of the control, respectively) and number of adenocarcinomas of the large intestine was observed. (Experiment 2) In BALB/c mice bearing subcutaneous (s.c.) implants of colon carcinoma 26 (Co 26Lu). bLF demonstrated significant inhibition of spontaneous lung metastasis (approximately 43% of the control). Number of cytotoxic asialoGM1+ and CD8+ cells in white blood cells increased (171% and 122% of control, respectively) after treatment. Results of those experiments indicate that bLF remarkably prevents colon carcinogenesis and lung metastasis of colon carcinoma cells, possibly due to increasing cytotoxic cells in the peripheral blood.

Topics: Animals; Azoxymethane; Cattle; CD4-Positive T-Lymphocytes; CD8-Positive T-Lymphocytes; Coculture Techniques; Colonic Neoplasms; G(M1) Ganglioside; Lactoferrin; Leukocytes; Lung Neoplasms; Male; Mice; Mice, Inbred BALB C; Neoplasm Metastasis; Neoplasm Transplantation; Rats; Rats, Inbred F344; Tumor Cells, Cultured

The effects of oral administration of bovine lactoferrin (bLF) and its hydrolysate on the lung colonization by colon 26 carcinoma were investigated. At doses of 100 or 300 mg/kg/day for seven successive days, bLFs demonstrated a significant inhibitory effect on experimental metastasis, which indicated effectiveness before and after tumor implantation. Oral administration of bLFs augmented CD4+, CD8+, and asialoGM1+ cells in the spleen and peripheral blood. Their cytotoxic activities against Yac-1 and colon 26 carcinoma were enhanced by bLF. In the small intestinal epithelium, CD4+ and CD8+ cells were markedly increased, and, simultaneously, enhanced production of interleukin-18 (IL-18) was confirmed in the intestinal epithelial cells. In this model, intravenous injection of murine IL-18 showed significant inhibition of the lung colonization by colon 26 carcinoma. These results suggested that inhibition of experimental metastasis by oral administration of bLF and pepsin hydrolysate of bLF might be due to enhanced cellular immunity, presumably mediated by enhanced IL-18 production in the intestinal epithelium.

Topics: Administration, Oral; Animals; Carcinoma; CD4-Positive T-Lymphocytes; CD8-Positive T-Lymphocytes; Colonic Neoplasms; Fluorescent Antibody Technique; G(M1) Ganglioside; Humans; Immunity, Cellular; Interleukin-18; Intestinal Mucosa; Killer Cells, Natural; Lactoferrin; Lung Neoplasms; Male; Mice; Mice, Inbred BALB C; Mice, Nude; Neoplasm Transplantation; Specific Pathogen-Free Organisms; Spleen; Tumor Cells, Cultured

Surgical manipulation of a tumor may result in increased influx of tumor cells into the systemic and portal circulation and give rise to formation of metastases. In addition, major surgery has been reported to cause profound immunosuppression. In an attempt to increase the host-antitumor immune mechanisms following surgery we have studied the effect of preoperative administration of interferon-gamma, related to the antimetastatic effects of Kupffer cells (KC) and natural killer cells (NK-cells) in the early phase of liver metastasis formation. Colon carcinoma cells were injected into the superior mesenteric vein of syngeneic mice and after 17 days metastases were quantified by weight, number, and uptake of [125I]iododeoxyuridine. Unstimulated control mice developed 10.5 surface nodules per liver 17 days following injection of colon carcinoma cells into the superior mesenteric vein of syngeneic mice. This figure was only 2.6 in mice stimulated with a single dose of 1000 IU IFN-gamma 4 h prior to inoculation of tumor cells. Administration of GdCl3, which is reported to deplete and block the function of Kupffer cells, 24 h prior to tumor cell inoculation resulted in a 5-fold tumor mass increase relative to control. Injection of anti-asiolo-GM1 antiserum, which eliminates the hepatic NK-cells, induced a 10-fold increase in tumor mass. These results indicate an important early antimetastatic function of hepatic NK-cells and KC and that presurgical administration of IFN-gamma may be important for eliminating circulating tumor cells and inhibiting development of residual tumors.

Topics: Animals; Antibodies; Carcinoma; Colonic Neoplasms; G(M1) Ganglioside; Gadolinium; Immune System; Injections, Intravenous; Interferon-gamma; Killer Cells, Natural; Kupffer Cells; Liver Neoplasms; Mesenteric Veins; Mice; Mice, Inbred BALB C; Mice, SCID; Neoplasm Transplantation; Tumor Cells, Cultured

Although the liver is a potent tumor cell killing organ it is frequently the site of lethal metastases often signifying the endstage for patients with colorectal cancers. Enhancing hepatic-associated immunity remains elusive until the interactions among hepatic nonparenchymal cells (NPC) are deciphered. We sought to modulate the cellular components of the hepatic immune system of mice with anti-NK and anti-T-cell-neutralizing antibodies in order to determine the cell type most efficacious in preventing liver metastasis.. Liver-derived murine colon adenocarcinoma (LD-MCA-38) cells were injected into the ileocolic vein (ICV) of immunocompetent and immunodeficient C57BL/6 mice. Mice were pretreated 1 day prior to tumor cell injection with one of three antibodies: anti-AsGM1, Anti-NK1.1, or Anti-Thy1.2. On Day 21 laparotomy was performed to determine the extent of hepatic tumor foci. The number of hepatic tumor foci was recorded and compared by the Wilcoxon rank sum test.. Mice pretreated with anti-AsGM1 or Anti-NK1.1 developed a massive increase in the number of hepatic tumor foci and decreased survival compared to the control treated mice. Pretreatment with anti-Thy1.2 antibody resulted in a significant decrease in the number of hepatic tumor foci. LD-MCA-38 tumor cells were unable to colonize the liver of C57BL/6 athymic nude mice; however, anti-AsGM1 antibody abolished this antimetastatic effect. There was no difference in the extent of hepatic metastasis and survival between immunodeficient C57BL/6 bg/bg and their conventional littermates bg/+.. AsGM1+ NK cells exhibit a significant antitumor response in the absence of T-cells. The concept of stimulating NK cell activity and suppressing T-cell function may enhance liver-associated immunity and serve as a deterrent for blood-borne tumor cells metastasizing to the liver.

Topics: Adenocarcinoma; Animals; Antibodies; Antibodies, Monoclonal; Antigens; Antigens, Ly; Antigens, Surface; Colonic Neoplasms; G(M1) Ganglioside; Immunocompetence; Killer Cells, Natural; Lectins, C-Type; Liver Neoplasms; Lymphocyte Count; Mice; Mice, Inbred BALB C; Mice, Inbred C57BL; Mice, Nude; Neoplasm Invasiveness; Neoplasm Transplantation; NK Cell Lectin-Like Receptor Subfamily B; Proteins; T-Lymphocytes; Thy-1 Antigens; Tumor Cells, Cultured

Fucosyl-GM1 (Fuc-GM1) [Fucalpha1 --> 2Galbeta1 --> 3GalNAcbeta1 --> 4(NeuAcalpha2-3)Galbeta1 --> 4Glcbeta1 --> O-Cer] is a small-cell-lung-cancer (SCLC)-associated ganglioside initially defined by the murine monoclonal antibody F12. On the basis of its known distribution, Fuc-GM1 is a potential target for active immunotherapy in SCLC patients. Fuc-GM1 has been extracted and purified from bovine thyroid. The immunogenicity of Fuc-GM1 was tested in mice either alone, mixed with carrier protein keyhole limpet hemocyanin (KLH) or covalently linked with KLH, plus immunological adjuvant QS-21. The Fuc-GM1-KLH conjugate plus QS-21 adjuvant was found to be optimal. It induced consistent IgM and IgG enzyme-linked immunosorbent assay (ELISA) titers against Fuc-GM1. These antibodies were strongly reactive with the strongly Fuc-GM1-positive rat hepatoma cell line H4-II-E, and they were moderately reactive with the moderately positive human SCLC cell line H146 by flow cytometry and complement-mediated lysis. Both ELISA and fluorescence-activated cell sorting (FACS) reactions were inhibited with Fuc-GM1or H4-II-E but not with the structurally related ganglioside GM1 or Fuc-GM1-negative colon cancer cell line LS-C. On the basis of these results, a vaccine comprising Fuc-GM1-KLH plus QS-21 is being prepared for testing in patients with SCLC.

Topics: Adjuvants, Immunologic; Animals; Antibodies, Neoplasm; Cancer Vaccines; Carcinoma, Small Cell; Cattle; Colonic Neoplasms; Complement System Proteins; Cytotoxicity, Immunologic; Enzyme-Linked Immunosorbent Assay; Female; G(M1) Ganglioside; Humans; Immunization; Liver Neoplasms, Experimental; Lung Neoplasms; Mice; Organ Specificity; Rats; Saponins; Tumor Cells, Cultured

We have investigated the inhibitory effect of oral administration of Juzen-taiho-to, a Kampo Japanese herbal medicine, on liver metastasis by the inoculation of a liver-metastatic variant (L5) of murine colon 26 carcinoma cells into the portal vein. Oral administration of Juzen-taiho-to for 7 days before tumor inoculation resulted in dose-dependent inhibition of liver tumor colonies and significant enhancement of survival rate as compared with the untreated control, without side effects. We also found that liver metastasis of L5 cells was enhanced in BALB/c mice pretreated with anti-asialo GM1 serum or 2-chloroadenosine, and in BALB/c nu/nu mice, compared to normal mice. This indicates that NK cells, macrophages, and T-cells play important roles in the prevention of metastasis of tumor cells. Juzen-taiho-to significantly inhibited the experimental liver metastasis of colon 26-L5 cells in mice pretreated with anti-asialo GM1 serum and untreated normal mice, whereas it did not inhibit metastasis in 2-chloroadenosine-pretreated mice or T-cell-deficient nude mice. Oral administration of Juzen-taiho-to activated peritoneal exudate macrophages (PEM) to become cytostatic against the tumor cells. These results show that oral administration of Juzen-taiho-to inhibited liver metastasis of colon 26-L5 cells, possibly through a mechanism mediated by the activation of macrophages and/or T-cells in the host immune system. Thus, Juzen-taiho-to may be efficacious for the prevention of cancer metastasis.

Topics: 2-Chloroadenosine; Administration, Oral; Animals; Anticarcinogenic Agents; Antineoplastic Agents, Phytogenic; Colonic Neoplasms; Cytotoxicity, Immunologic; Drug Interactions; Drugs, Chinese Herbal; Female; G(M1) Ganglioside; Immune Sera; Killer Cells, Natural; Liver Neoplasms, Experimental; Macrophages, Peritoneal; Male; Mice; Mice, Inbred BALB C; Mice, Nude; Neoplasm Transplantation; Stimulation, Chemical

Either folic or folinic acid enhanced the antimetastatic activity of recombinant murine interferon beta (rMulFN beta) toward highly metastatic colon carcinoma 26 (Co 26Lu). Folinic acid administered with rMuIFN beta markedly increased asialoGM1+CD4+ and asialoGM1+CD8+ T cell production in the peritoneal cavity but not in the thymus and spleen. Peritoneal cells expressed killing activity toward Co 26Lu cells in vitro. In athymic nude mice, the above combination produced many asialoGM1+CD4+ and few asialoGM1+CD8+ T cells in the peritoneal cavity, but did not decrease lung metastatic colonies. AsialoGM1+CD4+ T cells would thus appear to have no or only very weak killing activity toward these tumor cells. The antimetastatic activity of folinic acid with rMuIFN beta was significantly decreased with anti-asialoGM1 and anti-CD8 antibodies. Inactivated CD8+ and asialoGM1+ cells cease to have killing activity toward Co 26Lu cells as shown by Winn's assay. AsialoGM1+CD8+ cell production was markedly induced in the peritoneal cavity by treatment with rMuIFN beta and folinic acid. AsialoGM1+CD8+ T cells may be inhibiting lung metastasis of Co 26Lu. Folinic acid and interferon are used in combination therapy with 5-fluorouracil for biochemical modulation. Folinic acid with interferon, as adjuvant therapy, may promote the induction of CD8+ T cell production with consequent prevention of metastasis.

Topics: Animals; Antineoplastic Agents; CD4-Positive T-Lymphocytes; CD8-Positive T-Lymphocytes; Colonic Neoplasms; Drug Combinations; Folic Acid; G(M1) Ganglioside; Interferon-beta; Leucovorin; Lung Neoplasms; Mice; Mice, Inbred BALB C; Neoplasm Transplantation; Peritoneal Cavity

Anti-asialo GM1 serum (AGM1) reduces natural killer (NK) activity in vitro and in vivo. We investigated the effect of ingestion of sugar beet fiber (SBF) on 1,2-dimethylhydrazine (DMH)-induced aberrant crypt foci (ACF) and whether the effect was maintained under NK-reducing conditions by AGM1 injection. The ingestion of SBF decreased the number of ACF in the colorectum at 4 weeks after treatment with DMH. Dietary SBF had a suppressive effect on the formation of ACF regardless of the administration of AGM1. These results suggest that the suppressive effect created by the ingestion of SBF may overwhelm the effect of AGM1 treatment on ACF formation.

Topics: Animals; Chenopodiaceae; Colon; Colonic Neoplasms; Colonic Polyps; Dietary Fiber; G(M1) Ganglioside; Intestinal Mucosa; Male; Organ Size; Precancerous Conditions; Rats; Rats, Wistar; Spleen

Sialyltransferase activities, SAT-3 (CMP-NeuAc:nLcOse4Cer alpha 2-3sialyltransferase) and SAT-4 (CMP-NeuAc:GgOse4Cer alpha 2-3sialyltransferase), in Colo 205 cells catalyze the transfer of sialic acid to the terminal galactose of GlcNc-- and GalNAc-containing glycolipid substrates, respectively. Competition kinetic studies with nLcOse4Cer and GM1 as substrates in a sialyltransferase assay show that these two activities are catalyzed by two different catalytic entities. The two enzymes were co-solubilized with taurochlorate and resolved by DEAE--Cibacron Blue--Sepharose column chromatography into two elution peaks. The column eluent with SAT-3 activity failed to transfer sialic acid to asialo alpha(1)-acid glycoprotein, indicating that this enzyme is different from the sialyltransferase (ST3N) that synthesizes NeuAc alpha 2-3Gal linkage in asparagine-linked oligosaccharides of glycoprotein. However, SAT-3 activity can be immunoprecipitated with a polyclonal antibody produced against a protein expressed in Escherichia coli as GST-fusion protein from an ECB cDNA homolog of an alpha 2-3 sialyltransferase SAT-3 or STZ) the has been cloned from human melanoma cell and human placenta. Thus a concentration-dependent decrease in the residual SAT-3 activity relative to SAT-4 activity was observed in the supernatant after precipitation of the immune complex. Expression of SAT-3 (STZ) cDNA was also detected in Colo 205 cell by RT-PCR, followed by sequence analysis of the RT-PCR product. Characterization of the catalytic reaction products of SAT-3 and SAT-4 with thin-layer chromatography, sialidase treatment, and binding to specific antibodies indicates that both SAT-3 and SAT-4 catalyze the formation of alpha 2-3 linkage between sialic acid and terminal galactose of glycolipid substrates.

Topics: Base Sequence; Carcinoma; Cell Line; Ceramides; Colonic Neoplasms; Cross Reactions; DNA, Complementary; Enzyme Inhibitors; G(M1) Ganglioside; Glycolipids; Humans; Models, Chemical; Molecular Sequence Data; N-Acetylneuraminic Acid; Sialic Acids; Sialyltransferases; Substrate Specificity

This study was conducted to examine the effect of gamma-interferon (IFN-gamma) on experimental metastasis formation by murine colon 26 adenocarcinoma in BALB/c mice. We found that the number of experimental lung metastases was increased after colon 26 cells were pretreated for 1 h with as little as 1 OIU/ml of IFN-gamma. 5-[125I] iodo-2'-deoxyuridine-radiolabeled colon 26 cells pretreated with IFN-gamma remained at higher level in the lung at 24h after intravenous injection than when the cells were not pretreated. In vivo elimination of asialo GM1-positive cells increased the number of lung metastases and, in such mice, there was no longer a difference in metastatic ability between control and IFN-gamma-treated cells. Colon 26 cells were completely resistant to lysis by isolated splenocytes. Splenocytes incubated in vitro with interleukin 2 exhibited moderate cytotoxicity against colon 26 cells, but there were no significant differences between control and IFN-gamma-treated cells. Colon 26 cells pretreated with IFN-gamma demonstrated resistance to tumor necrosis factor alpha-mediated growth inhibition. The enhancement of metastases by IFN-gamma was dependent on de novo protein synthesis since the enhancement was abolished by cycloheximide. Taken together, the data suggest that the metastatic ability of colon 26 cells pretreated with IFN-gamma is significantly higher due to the resistance to asialo GM1-positive cells accompanied with de novo protein synthesis.

Topics: Adenocarcinoma; Animals; Antibodies; Cell Survival; Colonic Neoplasms; Cycloheximide; G(M1) Ganglioside; Interferon-gamma; Killer Cells, Lymphokine-Activated; Lung Neoplasms; Male; Mice; Mice, Inbred BALB C; Osmotic Fragility; Tumor Cells, Cultured; Tumor Necrosis Factor-alpha

Colorectal cancer frequently disseminates through the portal vein into the liver. In this study, outbred Swiss nude mice were adapted to facilitate the induction of liver metastases by a pre-grafting treatment with 6 Gy total body irradiation and i.v. injection of anti-asialo GM1 antibody. One day later, cultured LS 174T human colon cancer cells were injected into the surgically exposed spleen, which was resected 3 min later. In 48 of 65 mice, a few to several hundred liver metastases were macroscopically observed at dissection 3 to 4 weeks after transplantation. Ten of 10 mice, followed-up for survival, died with multiple large confluent liver metastases. By reducing the radiation dose to 4 or 0 Gy, or omitting the anti-asialo GM1 antibody injection, only 60%, 37% or 50% of mice, respectively, had visible metastases 3 weeks after transplantation. Carcinoembryonic antigen (CEA) measured in tumour extracts was in the mean 25.6 micrograms/g in liver metastases compared with 9.2 micrograms/g in s.c. tumours. Uptake of radiolabelled anti-CEA monoclonal antibody (MAb) in the metastases 12, 24 and 48 hr after injection gave a mean value of 39% of the injected dose per gram of tissue (ID/g). In comparison, MAb uptake in s.c. and intrasplenic tumours or lung metastases gave a mean percentage ID/g of 20, 18 and 15, respectively. Laser-induced fluorescence after injection of indocyanin-MAb conjugate allowed direct visual detection of small liver metastases, including some that were not visible under normal light. Preliminary results showed that mice, pre-treated with 4 Gy irradiation and the anti-asialo GM1 injection, were tolerant to radioimmunotherapy with a total dose of 500 muCi 131I labeled anti-CEA intact MAbs given in 3 injections.

Topics: Animals; Antibodies; Antibodies, Monoclonal; Carbocyanines; Carcinoembryonic Antigen; Colonic Neoplasms; Fluorescence; Fluorescent Dyes; G(M1) Ganglioside; Humans; Immunohistochemistry; Lasers; Liver Neoplasms; Mice; Mice, Nude; Neoplasm Transplantation; Radioimmunotherapy; Tumor Cells, Cultured; Whole-Body Irradiation

This study is intended to demonstrate the versatility and feasibility of custom-made oligosaccharide-exposing neoglycoconjugates including histo-blood group epitopes in various human lesions, including nasal polyps. The binding of the biotinylated probes was determined on formalin-fixed paraffin-embedded sections from archive materials. The general aspects of our results may be interpreted as follows: the neoglycoconjugates used here can readily detect differences in the ability of cells to bind glycan residues in tissue sections, thereby enabling the extent of the binding capacity of various types of human lesions to be compared. Furthermore, the reactivity to glycan may reflect characteristics of the cells and their environment. The investigation into pathological disorders with respect to the binding capacity of these carrier-immobilized mono- or oligosaccharide structures derived from custom-made synthesis or biochemical purification is based on the prospect of translating progress in this field into the establishment of potentially beneficial procedures for medical diagnosis and pathological classification.

Topics: Adenocarcinoma; Binding Sites; Blood Group Antigens; Brain Neoplasms; Breast Neoplasms; Carcinoma, Ductal, Breast; Carcinoma, Transitional Cell; Colonic Neoplasms; Feasibility Studies; Female; Fibroadenoma; G(M1) Ganglioside; Glioblastoma; Glycoconjugates; Histocytochemistry; Humans; Hyaluronic Acid; Male; Melanoma; Nasal Polyps; Neoplasms; Prostatic Hyperplasia; Skin Neoplasms; Trisaccharides; Urinary Bladder Neoplasms

We investigated the influence of the administration of anti-asialo GM1 antibody on aberrant crypt foci (ACF) formation induced by a single injection of 1,2-dimethylhydrazine (DMH). At four weeks after the injection of DMH (20 mg/kg body weight), the number of ACF and aberrant crypts were counted. Most ACF appeared in the distal large bowel, accounting for approximately 60% of the total ACF in both groups. Rats administered anti-asialo GM1 had significantly more ACF in the distal colon, the rectum and the total large bowel as compared to control rats. A similar tendency was observed for the number of aberrant crypts. The increased number of ACF resulting from the administration of anti-asialo GM1 was not accompanied by the enlargement of ACF size in every part of the colon. This study demonstrated that the administration of anti-asialo GM1 at the initiation stage leads to an increase in ACF as well as aberrant crypts in the distal colon, rectum and total large bowel probably via the suppression of natural killer cells.

Topics: 1,2-Dimethylhydrazine; Animals; Carcinogens; Cocarcinogenesis; Colonic Neoplasms; Dimethylhydrazines; G(M1) Ganglioside; Immune Sera; Killer Cells, Natural; Precancerous Conditions; Rats; Rats, Wistar

We have previously demonstrated that administration of killed streptococcal preparation (OK432), a biological modifier, increased the number of asialo GM1-positive cells in the liver, enhanced NK activity of hepatic mononuclear cells, and reduced the number of hepatic metastases of colon 38 adenocarcinoma that were inoculated into the superior mesenteric vein of C57BL/6 strain mice. In the present study, to clarify the role of the spleen in immune surveillance of the liver, the effect of splenectomy on hepatic metastasis of colon carcinoma and on hepatic NK activity has been examined. The number of hepatic metastasis increased in the splenectomized mice, compared with that in sham-operated mice. Administration of OK432 increased the number of asialo GM1-positive cells in the liver and enhanced NK activity of hepatic mononuclear cells in both groups, but NK activity of hepatic mononuclear cells in the splenectomized mice was less than that of the sham-operated mice. An enhanced NK activity of these cells was abolished by treatment with anti-asialo-GM1 antibody plus complement in vitro. Interleukin-2 mRNA expression was increased in the spleen 2 hr after OK432 administration and persisted until 8 hr, but was scarcely noted in the liver. On the other hand, NK activity of hepatic mononuclear cells in the asialo GM1-positive cell-depleted (previous administration of antiserum against asialo GM1) mice was enhanced after OK432 administration in the sham operated and splenectomized mice, but an enhanced NK activity in these mice was only partially or not at all abolished by treatment with anti-asialo GM1 antibody plus complement in vitro, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)

Topics: Animals; Colonic Neoplasms; G(M1) Ganglioside; Interleukin-2; Killer Cells, Natural; Liver; Liver Neoplasms; Male; Mice; Mice, Inbred C57BL; Picibanil; RNA, Messenger; Spleen; Splenectomy

An experimental model for hepatic metastasis with a transplantation route of free-pedicled subcutaneous-embedded spleen was established in BALB/c mice. Colon-26 tumor cells to produce hepatic metastasis were inoculated into the spleen and the influence of surgical stress by means of a 20-min exposure of the abdominal cavity on the incidence of hepatic metastasis was examined. Hepatic metastasis was more promoted by the surgical stress in order when it was given on the same day, the 7th day and the 3rd day of the inoculation. Administration, without surgical stress, of ASGM 1, a specific inhibitor of the natural killer activity, also facilitated the hepatic disease. Administration of OK-432 prior to the surgical stress or ASGM 1 was at least partly effective for prevention of the hepatic metastasis and prolonged the survival of the inoculated mice. Preoperative immunotherapy utilizing OK-432 might be a possible means to prevent hepatic metastasis triggered in colorectal surgery for cancer.

Topics: Animals; Antibodies; Antineoplastic Agents; Colonic Neoplasms; Cytotoxicity, Immunologic; Disease Models, Animal; G(M1) Ganglioside; Killer Cells, Natural; Liver Neoplasms; Male; Mice; Mice, Inbred BALB C; Neoplasm Transplantation; Neoplastic Cells, Circulating; Picibanil; Stress, Physiological; Surgical Procedures, Operative

The metabolism of two radiolabelled glycosphingolipids, lactosylceramide and GM1 ganglioside, in differentiated and undifferentiated HT-29 cells is reported. Both lactosylceramide and GM1 ganglioside were demonstrated to be extensively catabolized in undifferentiated cells, as deduced by the relative amount of the compounds formed along the degradative pathway. Conversely, in differentiated cells both precursors were utilized as substrates for sugar-chain elongation. Furthermore we were unable to detect any significant difference in the activity of CMP-NeuAc:GM1 alpha 2-->3 sialyltransferase, a Golgi key enzyme for the glycosylation of glycosphingolipids, between the two cell populations. Taken together with our previous results on the differentiation-dependent trimming of high-mannose N-linked glycoproteins in HT-29 cells, one can suggest that common steps control the anabolic/catabolic balance of these two classes of glycoconjugates as a function of differentiation.

Topics: Antigens, CD; Cell Differentiation; Colonic Neoplasms; G(M1) Ganglioside; Glycosphingolipids; Glycosylation; Golgi Apparatus; Humans; Lactosylceramides; Sialyltransferases; Tumor Cells, Cultured

Doxorubicin (DXR) was encapsulated in long-circulating liposomes, composed of ganglioside GM1 (GM1)/distearoylphosphatidylcholine (DSPC)/cholesterol (CH) (0.13:1:1 in molar ratio) and sized to approximately 100 nm in mean diameter, with 98% entrapping efficiency by the transmembrane pH gradient method. Free DXR, DXR-DSPC/CH and DXR-GM1/DSPC/CH liposomes were injected intravenously into Colon 26 tumor-bearing Balb/c mice via the tail vein at a dose of 5.0 mg DXR/kg. DXR-GM1/DSPC/CH liposomes gave a higher blood level of the drug than did DXR-DSPC/CH liposomes or free DXR up to 24 hours after injection, and the area under the blood concentration-time curve (AUC) for DXR-GM1/DSPC/CH liposomes was 1.5 or 526 times higher than that for DXR-DSPC/CH liposomes or free DXR, respectively. DXR-GM1/DSPC/CH liposomes gave a decreased DXR concentration in the reticuloendothelial system (RES) of the liver and the spleen. Both liposomal formulations effectively reduced the DXR concentration in the heart as compared with that in the case of free DXR. At 6 hours after i.v. injection, DXR-GM1/DSPC/CH liposomes provided an approximately 3.3- or 9-fold higher peak DXR level in the tumor as compared with DXR-DSPC/CH liposomes or the free drug, respectively. These high tumor levels of DXR appear to reflect the prolonged residence time of the liposomes. The results suggest that encapsulation of DXR in GM1-bearing long-circulating liposomes will be useful for cancer chemotherapy.

Topics: Animals; Carcinoma; Cholesterol; Colonic Neoplasms; Doxorubicin; Drug Carriers; Drug Compounding; G(M1) Ganglioside; Hydrogen-Ion Concentration; Liposomes; Male; Mice; Mice, Inbred BALB C; Particle Size; Phosphatidylcholines; Tissue Distribution

Doxorubicin (DXR) was encapsulated in long-circulating, thermosensitive liposomes (180-200 nm), prepared from dipalmitoylphosphatidylcholine (DPPC)/distearoylphosphatidylcholine (DSPC) (9:1 (m/m)) and 6 mol% of ganglioside GM1 (GM1), with 95-98% entrapping efficiency by the pH-gradient method. 45% of the entrapped DXR was released from these GM1/DPPC/DSPC liposomes by incubation at 42 degrees C for 5 min in 20% serum or saline (this degree of release was lower than that of hydrophilic drugs such as cisplatin, due to the basic and amphiphilic nature of DXR). Inclusion of GM1 (6 mol%) endowed DPPC/DSPC liposomes with prolonged circulation ability, resulting in increased blood levels of liposomes and decreased reticuloendothelial system uptake over 6 h after injection. Concomitantly, DXR levels in blood remained high for long time. Accumulation of DXR into tumor tissue of tumor-bearing mice (mouse colon carcinoma 26) by local hyperthermia after injection of DXR loaded, long-circulating, thermosensitive (DXR-GM1/DPPC/DSPC) liposomes was 2.5-times or 6-times higher than that after treatment with DXR-DPPC/DSPC liposomes or free DXR in combination with hyperthermia, respectively. Furthermore, the treatment with DXR-GM1/DPPC/DSPC liposomes and hyperthermia resulted in effective tumor-growth retardation and increased survival time. Our results indicate that the combination of drug-loaded, long-circulating, thermosensitive liposomes with local hyperthermia at the tumor site could be clinically useful for delivering a wide range of chemotherapeutic agents in the treatment of solid tumors.

Topics: 1,2-Dipalmitoylphosphatidylcholine; Animals; Colonic Neoplasms; Dose-Response Relationship, Drug; Doxorubicin; Drug Carriers; G(M1) Ganglioside; Hydrogen-Ion Concentration; Hyperthermia, Induced; Liposomes; Male; Mice; Mice, Inbred BALB C; Phosphatidylcholines; Temperature; Tissue Distribution

This investigation aimed to develop a biologically relevant murine model of colorectal liver metastases and determine if Kupffer cells (KC) and hepatic natural killer cells (hNKC) regulate tumor growth. The model involves the injection of murine colon adenocarcinoma 26 (MCA 26) tumor cells into the portal vein of female-specific pathogen-free BALB/c mice. Metastases developed in all animals, and the growth was limited entirely to the liver. To determine if KC and hNKC control the development of liver metastases, the in vivo function of these hepatic effector cells was modulated. Tumor growth was quantitated by the uptake of 125I into tumor DNA. Stimulation of the KC and hNKC produced a significant (P less than 0.01) dose-dependent decrease in 125I uptake in the liver in both treatment groups, which was associated with a significant improvement in survival (P less than 0.05). The in vivo cytotoxic function of the liver was inhibited with an intravenous injection of gadolinium chloride (for KC) or asialo GM1 antiserum (for hNKC). Inhibition of KC and hNKC cytotoxic function led to a significant (P less than 0.01) increase in 125I uptake in the liver and a significant decrease in survival (P less than 0.05).

Topics: Adenocarcinoma; Animals; Antineoplastic Agents; Cell Division; Cell Line; Cell Survival; Colonic Neoplasms; Cytosine; Cytotoxicity, Immunologic; Female; G(M1) Ganglioside; Gadolinium; Immune Sera; Killer Cells, Natural; Kupffer Cells; Liver Neoplasms; Mice; Mice, Inbred BALB C; Propionibacterium acnes; Rectal Neoplasms

This study investigates the role of hepatic asialo GM1-positive cells in inhibiting hepatic metastasis of colon carcinoma (colon adenocarcinoma 38) in mice after administration of a biological response modifier, streptococcal derivative (OK432). Administration of OK432 increased the number of asialo GM1-positive cells in the liver, enhanced natural killer activity of hepatic mononuclear cells and reduced the number of hepatic metastases of colon carcinoma inoculated into the superior mesenteric vein. Administration of antiserum against asialo GM1 reduced the number of hepatic asialo GM1-positive cells, abolished natural killer activity of hepatic mononuclear cells and increased the number of hepatic metastases. In addition, administration of antiserum against asialo GM1 even after OK432 treatment also decreased the number of asialo GM1-positive cells, reduced natural killer activity of hepatic mononuclear cells and increased the number of hepatic metastases of colon carcinoma. However, administration of gadolinium chloride, which suppresses phagocytic function of Kupffer cells, did not influence the natural killer activity of hepatic mononuclear cells or the number of hepatic metastases. In vivo tumor-neutralization assay revealed that tumor growth was inhibited by the hepatic mononuclear asialo GM1-positive cells, but not by T lymphocytes or Kupffer cells after OK432 administration. These results suggest that an increased number of hepatic asialo GM1-positive cells after administration of OK432 plays an important role in protecting against metastasis of colon carcinoma in the liver.

Topics: Animals; Carcinoma; Colonic Neoplasms; G(M1) Ganglioside; Immunologic Factors; Killer Cells, Natural; Kupffer Cells; Liver Neoplasms, Experimental; Male; Mice; Mice, Inbred C57BL; Picibanil

Preincubation of murine colon 26 colon adenocarcinoma cells with gamma-interferon (IFN-gamma), but not alpha-interferon, produced a significant increase in experimental pulmonary metastases in syngeneic BALB/c and T-cell-deficient BALB/c nude mice. The enhancement was seen after as little as 1 h of exposure to 1 unit/ml of IFN-gamma and persisted for at least 72 h following removal of the cytokine. IFN-gamma exerted its effects by increasing the pulmonary retention of cells during the first 6 h following tumor cell injection. During this period all cells visualized in the lung were trapped in pulmonary capillaries. The enhancement was not due to modulations in class I major histocompatibility complex surface antigen expression; nor was it due to alterations in cell size, adhesion to components of the extracellular matrix in vitro, heterotypic or homotypic adhesion, sensitivity to lysis by activated peritoneal macrophages, osmotic fragility, enhancement of surface class II major histocompatibility complex antigen expression, or enhancement of intercellular adhesion molecule-1 (ICAM-1). Colon 26 was completely resistant to natural killer cell-mediated lysis in vitro, and IFN-gamma did not modulate the ability of colon 26 to form conjugates with isolated splenocytes. In vivo elimination of anti-asialo GM1 + cells increased pulmonary metastasis, and in such mice, there was no longer a difference in metastatic potential between control and IFN-gamma-treated cells. We conclude that low doses of IFN-gamma generated at the site of the tumor by host-infiltrating cells or during cytokine therapy could enhance the survival of tumor cells in the circulation and enhance their metastatic potential.

Topics: Adenocarcinoma; Animals; Antibodies; Cell Adhesion; Cell Division; Colonic Neoplasms; Extracellular Matrix; Female; G(M1) Ganglioside; Gene Expression; Glycosphingolipids; Histocompatibility Antigens Class I; Idoxuridine; Interferon-gamma; Iodine Radioisotopes; Killer Cells, Natural; Lung Neoplasms; Macrophages; Mice; Mice, Inbred BALB C; Mice, Nude; Neoplasm Metastasis; Oncogenes; Tumor Cells, Cultured

Exposure of the intestinal mucosa to Vibrio cholerae enterotoxin (CT) results in mucus secretion from intestinal goblet cells. On the other hand, there is evidence that elevation of intracellular adenosine 3',5'-cyclic monophosphate levels is not sufficient to induce rapid mucin secretion. To determine whether CT has direct effects on human goblet cells and whether CT alone can elicit rapid exocytosis of apical mucin granules, purified CT was applied to monolayer cultures of well-differentiated HT-29-18 N2 cells, a goblet cell subclone derived from the human colon carcinoma line HT-29. CT bound with high affinity (dissociation constant = 10.5 +/- 1.9 nM) to receptors on these cells (approximately 60,000/apical membrane). Binding of radiolabeled CT was inhibited by excess CT or B subunit but not by A subunit. Preincubation of goblet cells with CT blocked the subsequent CT-specific ribosylation of a 45-kDa protein in membrane fractions of the cells and increased the activity of adenylate cyclase by 2- and 10-fold after 1 and 20 h, respectively. Light micrographs revealed that goblet cells incubated with CT, like control cells, contained abundant apical mucin granules. In contrast, goblet cells incubated with Ca2+ inophore A23187 and phorbol ester were rapidly depleted of mucin granules. Thus CT has direct physiological effects on HT-29 goblet cells, but these do not lead to rapid mucin secretion. These results raise the possibility that CT may accelerate mucin secretion in intact mucosa by an indirect mechanism perhaps mediated by mucosal nerves or other cell types.

Topics: Cell Line; Cell Membrane; Cholera Toxin; Clone Cells; Colonic Neoplasms; Cyclic AMP; Cytoplasmic Granules; Exocytosis; G(M1) Ganglioside; Humans; Kinetics; Mucins; NAD; Receptors, Cell Surface; Receptors, Immunologic; Tumor Cells, Cultured

We have studied the effect of maturation to small intestinal-like epithelial cells of the human colonic carcinoma cell line HT29 on the lateral mobility of different representative membrane components (lipid, proteins), as assessed with fluorescence recovery after photobleaching (FRAP). Maturation was induced in vitro in the HT29 cells by replacing glucose (Glu) with galactose (Gal) in the growth medium (DMEM) during a 21-day period. Scanning electron microscopy revealed an increased number of microvilli in the apical cell membrane, and enzyme analyses (alkaline phosphatase, aminopeptidase) in combination with aqueous countercurrent distribution, indicated that maturation was induced with DMEM-Gal. In comparison to control cells grown in DMEM-Glu medium, the more small intestinal-like cells grown in DMEM-Gal displayed no alteration of the lateral mobility of either cholera toxin (B subunit)-labelled ganglioside GM1 (diffusion coefficient, D [x 10(8)] = 0.8-0.9 cm2s-1; mobile fraction, R = 50-60%) or antibody-stained Class 2 histocompatibility (HLA-DR) antigen (D [x 10(9)] = 2 cm2s-1; R = 60-70%). However, antibody-labelled beta 2-microglobulin of HLA Class 1 antigen displayed increased mobility in HT29-Gal cells; D was x 1.4 and R x 1.8 larger in the HT29-Gal cells. By contrast, the mobility of a neoplastic antigen was reduced; D and R were x0.60 and x0.69 of the values seen in HT29-Glu cells. It is thus concluded that DMEM-Gal-induced differentiation in confluent HT29 cells is accompanied by specific rather than general effects on the lateral mobility of different membrane components.

Topics: Carcinoma; Cell Compartmentation; Cell Differentiation; Cell Membrane; Colonic Neoplasms; Cytoskeleton; Diffusion; G(M1) Ganglioside; HLA Antigens; Humans; Intestine, Small; Membrane Fluidity; Membrane Glycoproteins; Membrane Lipids; Membrane Proteins; Microscopy, Electron, Scanning; Mucin-1; Tumor Cells, Cultured

The ability of the host-immune defense mechanism of nude mice and their immunocompetent littermates to prevent liver metastases from the murine colon carcinoma, colon-26, was assessed. Give thousand tumor cells suspended in 0.05 ml of Hank's balanced salt solution were inoculated into the spleens of BALB/c nu/+ and BALB/c nu/nu mice. On the 21st day after inoculation, all the mice were sacrificed, and the liver metastases counted and the livers weighed. All the BALB/c nu/+ mice were found to have developed hepatic metastases with a mean of 10 nodules, whereas no hepatic metastases were observed in any of the 10 BALB/c nude mice. On the other hand, 4 of 6 nude mice developed hepatic metastases after treatment with anti-asialo GM1 antibody. These results indicate that the BALB/c nude mouse has an excellent host-immune defense mechanism for preventing liver metastasis, with NK cells in the liver and/or blood circulation perhaps playing an important role.

Topics: Animals; Antibodies; Colonic Neoplasms; Evaluation Studies as Topic; G(M1) Ganglioside; Glycosphingolipids; Immunity, Innate; Killer Cells, Natural; Liver Neoplasms; Male; Mice; Mice, Inbred BALB C; Mice, Nude; Time Factors; Transplantation, Homologous

This investigation was undertaken in order to assess both the preventive and antiproliferative effects of tumor necrosis factor (TNF) in a hepatic metastasis model, by means of inoculation of mouse colon-26 tumor cells into the portal vein via the superior mesenteric vein in male CDF1 mice, aged 5 weeks. Continuous 10-day administration of natural human TNF-alpha (nHuTNF-alpha) following the tumor cell inoculation caused no reduction but rather an increase in the number of hepatic metastases. However, pretreatment with this preparation daily for 10 days before the inoculation caused a remarkable decrease in the number of hepatic metastases. This prophylactic effect was reversed by the intravenous administration of anti-asialo GM1 antibody 24 h before the inoculation. The result of immunoperoxidase staining of liver specimens suggested that organ-associated natural killer cells might play a role in the metastatic inhibition. An apparent antiproliferative effect on metastatic liver tumors was also recognized following injection of nHuTNF-alpha from the 10th day after the inoculation. Thus, TNF appears to have important effects upon the host immune system, acting against liver metastases.

Topics: Animals; Antigen-Antibody Reactions; Cell Division; Colonic Neoplasms; G(M1) Ganglioside; Glycosphingolipids; Immunoenzyme Techniques; Liver Neoplasms; Mice; Neoplasm Metastasis; Tumor Necrosis Factor-alpha

Human recombinant interleukin-2 (rIL-2) was administered to normal and tumor-bearing BDF mice for 1 to 3 weeks, and the hematologic, clinical chemistry, gross and histopathologic findings were evaluated. Vascular leak syndrome (pulmonary edema, pleural effusion, ascites), hepatocyte necrosis, elevated hepatic serum transaminases, hypoalbuminemia, tissue and peripheral eosinophilia, thrombocytopenia, and prerenal azotemia were the detrimental effects of rIL-2 treatment. Vascular leak syndrome and hepatocyte necrosis were causally associated with vascular-oriented lymphocytic infiltration of pulmonary and hepatic parenchyma. Pleural effusions contained up to 99,000 cells/mm3, most of which were large granular lymphocytes. Antiserum to the glycolipid asialo GM1 (ganglio-n-tetrosylceramide), given simultaneously with rIL-2, prevented overt toxicity of rIL-2 (mortality, vascular leak syndrome, and hepatic damage) and substantially reduced infiltration of pulmonary and hepatic vasculature by asialo GM1+ lymphocytes. Asialo GM1 antiserum did not inhibit lymphoid hyperplasia, tissue infiltration by Lyt 2+ lymphocytes, tissue and peripheral eosinophilia, or thrombocytopenia in rIL-2 treated mice. Additionally, asialo GM1 antisera prevented toxicity, but not anti-tumor efficacy, of high dose rIL-2 therapy in BDF mice bearing the colon 38 adenocarcinoma. These results suggest that, in BDF mice and with this tumor model, vascular leak syndrome and hepatocyte necrosis are mediated by an endogenous subset of rIL-2-stimulated lymphocytes which are asialo GM positive, that mechanisms of toxicity and efficacy associated with high dose rIL-2 therapy are not necessarily the same, and that these mechanisms can be therapeutically separated.

Topics: Adenocarcinoma; Animals; Antibodies, Monoclonal; Capillary Permeability; Colonic Neoplasms; G(M1) Ganglioside; Glycosphingolipids; Hyperplasia; Immunotherapy; Interleukin-2; Killer Cells, Natural; Liver Diseases; Lymphocyte Activation; Lymphocytes; Mice; Pleural Effusion; Pulmonary Edema; Recombinant Proteins; Spleen

DHD/K12 TRb (PROb) and DHD/K12 TSb (REGb) are two cancer cell variants originating from the same rat colon adenocarcinoma. They differ in their tumorigenicity: when inoculated into syngeneic BDIX rats, PROb cells induce progressive tumors whereas REGb cells induce tumors which always regress. As previously described, there is an inverse relation between their tumorigenicity and their susceptibility to NCMC mediated by syngeneic spleen or peripheral blood lymphocytes: PROb cells are significantly less sensitive to NCMC than REGb cells. This suggests a role for NCMC in the regression of REGb tumors. In this work the BDIX NCMC effector cells active in vitro against REGb cells were identified as NK cells according to four criteria: (1) efficacy in a 4-h 51Cr release assay, (2) sensitivity to anti-asGM1 antibody plus complement, (3) LGL morphology, and (4) ability to bind with the same affinity REGb and YAC-1 cells. In spleen, these NK cells were heterogeneous with respect to their asGM1 surface density and their morphology. PROb cells were not lysed by these NK cells in a short-term cytotoxicity assay, but only in a 16-h assay. It was shown that PROb and REGb cells were bound with the same affinity by NK cells, thus they certainly differ in their ability to resist to NK lytic mechanisms. This difference could play a role in the different tumorigenicity of the two variants.

Topics: Adenocarcinoma; Animals; Antibodies, Monoclonal; Binding, Competitive; Colonic Neoplasms; Complement System Proteins; Cytotoxicity, Immunologic; G(M1) Ganglioside; Glycosphingolipids; Killer Cells, Natural; Leukocyte Count; Leukocytes, Mononuclear; Male; Neoplasm Regression, Spontaneous; Neoplasms, Experimental; Rats; Rats, Inbred Strains; Spleen

We have studied the influence of interferons (IFNs) on the metastatic potential of mouse colon adenocarcinoma, COLON 26, cells. Pre-treatment of the cells in vitro for 24 hr with recombinant murine IFN-gamma (rMuIFN-gamma) significantly increased the number of lung tumour nodules when cells were injected i.v. into immunocompetent BALB/c mice and BALB/c nude mice. However, when MuIFN-gamma-pre-treated cells were injected into beige (NK-deficient) nude mice or anti-asialoGM 1 (asGM 1)-serum-treated BALB/c mice (NK-depleted) no enhancement of metastatic potential was seen. Pre-treatment of COLON 26 cells with recombinant human IFN-alpha A/D (Bg1 I), an IFN with equal activity on human and mouse cells, did not significantly enhance their subsequent metastases in immunocompetent or immunodeficient mice. In fact, there was a small but significant decrease in the number of tumour nodules in the lungs of beige nude and asGM 1-treated mice. The effects of rMuIFN-gamma on COLON 26 cells did not appear to be related to an alteration in MHC expression. COLON 26 cells constitutively express H-2D and H-2K antigens and both IFNs had equal enhancing (approx. 2-fold) activity on the expression of these antigens at the doses used in this experiment (10(3)U/ml). We conclude that pre-treatment with rMuIFN-gamma renders COLON 26 cells resistant to in vivo NK-cell lysis via a mechanism that does not involve changes in MHC expression.

Topics: Adenocarcinoma; Animals; Colonic Neoplasms; Cytotoxicity, Immunologic; G(M1) Ganglioside; Glycosphingolipids; H-2 Antigens; Immunologic Deficiency Syndromes; Interferon-gamma; Killer Cells, Natural; Lung Neoplasms; Macrophages; Mice; Mice, Inbred BALB C; Mice, Mutant Strains; Mice, Nude; Neoplasm Metastasis; Neoplasm Transplantation; Tumor Cells, Cultured

In a previous work, a cell line (DHD/K12) was established from a colon adenocarcinoma induced in a BDIX rat by 1,2-dimethylhydrazine. From this line, two cloned sublines, PROb and REGb, were then isolated. When subcutaneously inoculated into syngeneic rats, PROb cells yield progressive tumors, whereas REGb cells yield tumors which regress. In this study, in a 16-h 51Cr release assay, natural cytotoxicity mediated by BDIX splenic nonadherent lymphoid cells (NK cells) was shown to be much higher against REGb cells than against PROb cells. Whatever the target cells, NK cytotoxicity was always higher when the effector cells were obtained from males rather than from females. Treatment of BDIX splenic lymphocytes by anti-asGM1 serum plus complement revealed that both anti-asGM1 sensitive and non-sensitive NK cells exist. The activity of anti-asGM1 non-sensitive NK cells appeared to be minor and to be detected only when the level of cytotoxicity before treatment was sufficiently high. The difference between PROb and REGb tumor growth appears to be linked, at least in part, to a higher sensitivity of REGb cells to NK cells and especially to anti-asGM1-sensitive NK cells.

Topics: Adenocarcinoma; Animals; Antibodies; Clone Cells; Colonic Neoplasms; Complement System Proteins; Cytotoxicity, Immunologic; G(M1) Ganglioside; Glycosphingolipids; Killer Cells, Natural; Rats

The immunoreactivity of a monosialoganglioside antigen defined by monoclonal antibody 116NS19-9 (19-9) was studied in neoplastic and normal glandular and mucosal epithelia using an indirect immunoperoxidase method. In neoplastic mucosae, the antigen was detected in the majority of colorectal and endometrial carcinomas, predominantly in a focal staining pattern. A substantial proportion of gastric and pancreatic tumors and an occasional breast carcinoma also reacted with the monoclonal antibody. Expression of the monosialoganglioside in normal colonic mucosa appeared to be restricted to areas adjacent to tumor tissue. In gastric mucosa, the antigen was confined to some areas showing intestinal metaplasia. The antigen was also detected in the epithelium of normal mucosa of the gall bladder and endocervix, as well as in some ductal epithelia of the pancreas and salivary glands. Most other mucosae were negative for antigen expression.

Topics: Adenocarcinoma; Antibodies, Monoclonal; Antigens; Antigens, Neoplasm; Colonic Neoplasms; Female; G(M1) Ganglioside; Gangliosides; Humans; Immunoenzyme Techniques; Male; Neoplasms; Organ Specificity; Rectal Neoplasms; Uterine Neoplasms

Monoclonal antibodies were produced after immunization of mice with a colorectal adenocarcinoma cell line or liver metastasis membranes from a patient with colon adenocarcinoma. Many monoclonal antibodies were found to react with colorectal adenocarcinoma cells but not with normal colon mucosa, blood lymphocytes, myeloma cells or lung epithelial carcinoma cells. Three of these 'colorectal tumour-specific' antibodies appear to define different antigens that were found in the complex monosialoganglioside fraction from 60 to 90% of the colorectal and pancreatic adenocarcinoma tumours or metastases examined but essentially lacking in normal colon mucosa and other normal or tumour tissues tested.

Topics: Adenocarcinoma; Animals; Antibodies, Monoclonal; Antibodies, Neoplasm; Antibody Specificity; Antigens, Neoplasm; Binding Sites, Antibody; Colonic Neoplasms; Enzyme-Linked Immunosorbent Assay; G(M1) Ganglioside; Humans; Mice; Mice, Inbred BALB C