mercaptopurine and Escherichia-coli-Infections

The role of the immune response in pyelonephritis was investigated by manipulation of the host's immune capacity using the immunosuppressive drugs 6-mercaptopurine, cyclophosphamide and thiamphenicol. Treatment with 6-mercaptopurine depressed the humoral immune response but did not have an adverse effect on the course of renal infection. Thiamphenicol administration prevented the development of pathological lesions but this was due to the anti-bacterial activity of thiamphenicol and not to its immunosuppressive activity. Pyelonephritic animals treated with cyclophosphamide did not produce anti-bacterial antibody. Despite this, cyclophosphamide-treated animals were able to eliminate organisms more readily from the infected kidney than untreated animals with a normal humoral immune response. We believe that blocking of the phenomenon of immunological enhancement explains these unexpected results and that the immune response to renal infection may have an immunoenhancing role protecting the bacterial cell from otherwise effective host defence mechanisms.

Topics: Animals; Antibodies, Bacterial; Antibody Formation; Cyclophosphamide; Escherichia coli Infections; Female; Kidney; Mercaptopurine; Pyelonephritis; Rats; Thiamphenicol

Topics: Animals; Antigens, Bacterial; Escherichia coli; Escherichia coli Infections; Female; Immunosuppressive Agents; Male; Mercaptopurine; Mice; Muramidase

Topics: Adjuvants, Immunologic; Animals; Antibody Formation; Azathioprine; Escherichia coli Infections; Hemagglutination Tests; Immunosuppression Therapy; Mercaptopurine; Pyelonephritis; Rabbits

Topics: Chromatography; Chromatography, Gel; Drug Tolerance; Endotoxins; Escherichia coli Infections; Fever; Immunoelectrophoresis; Immunosuppressive Agents; Mercaptopurine; Rabbits; Research; Toxicology; Ultracentrifugation

Topics: Adolescent; Appendicitis; Child; Child, Preschool; Escherichia coli Infections; Female; Humans; Leukemia; Male; Mercaptopurine; Mortality; Pseudomonas aeruginosa; Pseudomonas Infections; Sepsis

Topics: Adolescent; Aminosalicylic Acid; Aminosalicylic Acids; Anti-Bacterial Agents; Antiemetics; Calcium Chloride; Child; Drug Therapy; Escherichia coli Infections; Gastroenteritis; Humans; Infant; Infant, Newborn; Infant, Newborn, Diseases; Mercaptopurine; Toxicology; Vomiting

Topics: Abscess; Anti-Bacterial Agents; Aspergillosis; Candidiasis; Clostridium; Electrocardiography; Escherichia coli Infections; Geriatrics; Heart Diseases; Humans; Klebsiella; Mechlorethamine; Mercaptopurine; Pathology; Proteus; Staphylococcal Infections; Statistics as Topic; Steroids; Streptococcal Infections; Surgical Procedures, Operative