n-(cyanomethyl)-4-(2-((4-(4-morpholinyl)phenyl)amino)-4-pyrimidinyl)benzamide and Disease-Models--Animal

Myeloproliferative neoplasms (MPNs) are diseases that carry the JAK2 (V617F) mutation in about 70% of the patients. The purpose of this review is to describe the recent advances in the therapy of MPNs with JAK2 inhibitors.. Many drugs are now under investigations targeting different pathways critical for MPN development, such as the JAK-STAT (JAK2 inhibitors: INCB018424 or ruxolitinib, TG101348 or SAR302503, CYT387, SB1518, CEP701 and LY2784544) and the PI3K/AKT/mTOR (everolimus) pathways, or act through remodeling of chromatin with a key role in epigenetics (givinostat, panobinostat and vorinostat). The most relevant effects were spleen size reduction and relief of constitutional symptoms.. Patients who might benefit from JAK2 inhibitors in clinical practice are mostly those with splenomegaly or with constitutional symptoms. We should alert patients with lower hemoglobin levels that these therapies might, although temporarily, favor the need for red blood cell transfusions.

Topics: Animals; Benzamides; Clinical Trials as Topic; Disease Models, Animal; Drug Evaluation, Preclinical; Humans; Janus Kinase 2; Janus Kinases; Mice; Myeloproliferative Disorders; Nitriles; Protein Kinase Inhibitors; Pyrazoles; Pyrimidines; Pyrrolidines; Sulfonamides

When Zika virus emerged as a public health emergency there were no drugs or vaccines approved for its prevention or treatment. We used a high-throughput screen for Zika virus protease inhibitors to identify several inhibitors of Zika virus infection. We expressed the NS2B-NS3 Zika virus protease and conducted a biochemical screen for small-molecule inhibitors. A quantitative structure-activity relationship model was employed to virtually screen ∼138,000 compounds, which increased the identification of active compounds, while decreasing screening time and resources. Candidate inhibitors were validated in several viral infection assays. Small molecules with favorable clinical profiles, especially the five-lipoxygenase-activating protein inhibitor, MK-591, inhibited the Zika virus protease and infection in neural stem cells. Members of the tetracycline family of antibiotics were more potent inhibitors of Zika virus infection than the protease, suggesting they may have multiple mechanisms of action. The most potent tetracycline, methacycline, reduced the amount of Zika virus present in the brain and the severity of Zika virus-induced motor deficits in an immunocompetent mouse model. As Food and Drug Administration-approved drugs, the tetracyclines could be quickly translated to the clinic. The compounds identified through our screening paradigm have the potential to be used as prophylactics for patients traveling to endemic regions or for the treatment of the neurological complications of Zika virus infection.

Topics: Animals; Antiviral Agents; Artificial Intelligence; Chlorocebus aethiops; Disease Models, Animal; Drug Evaluation, Preclinical; High-Throughput Screening Assays; Immunocompetence; Inhibitory Concentration 50; Methacycline; Mice, Inbred C57BL; Protease Inhibitors; Quantitative Structure-Activity Relationship; Small Molecule Libraries; Vero Cells; Zika Virus; Zika Virus Infection

Atopic dermatitis (AD) is a chronic recurrent skin disease dominated by T-helper 2 inflammation. Momelotinib (MMB) is a novel JAK1/JAK2 inhibitor suppressing the signal transduction of multiple pro-inflammatory cytokines. Recent studies indicated that JAK inhibitor could play a therapeutic role in AD disease. In this study, we evaluated the efficacy of MMB as a novel JAK1/JAK2 inhibitor in DNCB-induced AD mice and TSLP-activated dendritic cells. Our data showed that topical application of MMB reduced the skin severity scores and total serum IgE levels, and alleviated the histological indexes including epidermal thickness measurement and mast cell number. Also, it was demonstrated that MMB down-regulated the mRNA expression of IL-4, IL-5, IFN-γ and TSLP, and inhibited the phosphorylation of STAT1, STAT3 and STAT5 in skin lesions. Moreover, MMB reduced the expression of CD80, CD86, MHCII and mRNA of OX40L in TSLP-activated dendritic cells. In general, our study suggests that MMB can improve the symptoms of AD and topical application of MMB can become a promising new therapy strategy for AD.

Topics: Administration, Topical; Animals; Anti-Inflammatory Agents; Benzamides; Cytokines; Dendritic Cells; Dermatitis, Atopic; Dinitrochlorobenzene; Disease Models, Animal; Female; Gene Expression Regulation; Immunoglobulin E; Janus Kinase 1; Janus Kinase 2; Male; Mice, Inbred BALB C; Mice, Inbred C57BL; OX40 Ligand; Phosphorylation; Protein Kinase Inhibitors; Pyrimidines; RNA, Messenger; Skin; STAT Transcription Factors; Thymic Stromal Lymphopoietin

Topics: Animals; Benzamides; Cells, Cultured; Disease Models, Animal; Graft vs Host Disease; Humans; Janus Kinases; Mice; Mice, Inbred BALB C; Myeloproliferative Disorders; Protein Kinase Inhibitors; Pyrimidines; T-Lymphocytes

Activating alleles of Janus kinase 2 (JAK2) such as JAK2(V617F) are central to the pathogenesis of myeloproliferative neoplasms (MPN), suggesting that small molecule inhibitors targeting JAK2 may be therapeutically useful. We have identified an aminopyrimidine derivative (CYT387), which inhibits JAK1, JAK2, and tyrosine kinase 2 (TYK2) at low nanomolar concentrations, with few additional targets. Between 0.5 and 1.5muM CYT387 caused growth suppression and apoptosis in JAK2-dependent hematopoietic cell lines, while nonhematopoietic cell lines were unaffected. In a murine MPN model, CYT387 normalized white cell counts, hematocrit, spleen size, and restored physiologic levels of inflammatory cytokines. Despite the hematologic responses and reduction of the JAK2(V617F) allele burden, JAK2(V617F) cells persisted and MPN recurred upon cessation of treatment, suggesting that JAK2 inhibitors may be unable to eliminate JAK2(V617F) cells, consistent with preliminary results from clinical trials of JAK2 inhibitors in myelofibrosis. While the clinical benefit of JAK2 inhibitors may be substantial, not the least due to reduction of inflammatory cytokines and symptomatic improvement, our data add to increasing evidence that kinase inhibitor monotherapy of malignant disease is not curative, suggesting a need for drug combinations to optimally target the malignant cells.

Topics: Animals; Apoptosis; Benzamides; Cell Line, Tumor; Cytokines; Disease Models, Animal; Drug Screening Assays, Antitumor; Hematologic Neoplasms; Hematopoiesis; Janus Kinase 1; Janus Kinase 2; Mice; Mice, Inbred BALB C; Mutation, Missense; Myeloproliferative Disorders; Protein Kinase Inhibitors; Pyrimidines