title: Regulation of dendritic cell differentiation and antitumor immune response in cancer by pharmacologic-selective inhibition of the janus-activated kinase 2/signal transducers and activators of transcription 3 pathway.
abstract: Abnormal dendritic cell differentiation and accumulation of immunosuppressive myeloid cells in cancer is one of the major factors of tumor nonresponsiveness. We have previously shown that hyperactivation of the Janus-activated kinase 2/signal transducers and activators of transcription 3 (JAK2/STAT3) induced by tumor-derived factors (TDF) is responsible for abnormal dendritic cell differentiation. Here, using a novel selective inhibitor of JAK2/STAT3 JSI-124, we investigated the possibility of pharmacologic regulation of dendritic cell differentiation in cancer. Our experiments in vitro have shown that JSI-124 overcomes the differentiation block induced by TDF and promotes the differentiation of mature dendritic cells and macrophages. JSI-124 significantly reduced the presence of immature myeloid cells in vivo and promoted accumulation of mature dendritic cells. In addition to a direct antitumor effect in several animal models, JSI-124 significantly enhanced the effect of cancer immunotherapy. This indicates that pharmacologic inhibition of the JAK2/STAT3 pathway can be an important new therapeutic strategy to enhance antitumor activity of cancer immunotherapy.
authors.affiliation: Department of Interdisciplinary Oncology, University of South Florida, Tampa, FL 33612, USA.
authors.forename: Yulia
authors.initials: Y
authors.lastname: Nefedova
authors.forename: Srinivas
authors.initials: S
authors.lastname: Nagaraj
authors.forename: Amsler
authors.initials: A
authors.lastname: Rosenbauer
authors.forename: Carlos
authors.initials: C
authors.lastname: Muro-Cacho
authors.forename: Said M
authors.initials: SM
authors.lastname: Sebti
authors.forename: Dmitry I
authors.initials: DI
authors.lastname: Gabrilovich
mesh_terms: D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000187:drug effects / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000187:drug effects / Q000276:immunology; D002454:Cell Differentiation / Q000187:drug effects / Q000276:immunology; D045744:Cell Line, Tumor; D003110:Colonic Neoplasms / Q000188:drug therapy / Q000276:immunology / Q000628:therapy; D003713:Dendritic Cells / Q000166:cytology / Q000187:drug effects* / Q000276:immunology* / Q000378:metabolism; D018984:Epitopes, T-Lymphocyte / Q000276:immunology; D005260:Female; D016219:Immunotherapy, Adoptive / Q000379:methods*; D053614:Janus Kinase 2; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D022423:Myeloid Cells / Q000166:cytology / Q000187:drug effects / Q000276:immunology; D041681:NIH 3T3 Cells; D011505:Protein-Tyrosine Kinases / Q000037:antagonists & inhibitors* / Q000378:metabolism; D011518:Proto-Oncogene Proteins / Q000037:antagonists & inhibitors* / Q000378:metabolism; D050796:STAT3 Transcription Factor / Q000037:antagonists & inhibitors* / Q000378:metabolism; D012513:Sarcoma, Experimental / Q000188:drug therapy / Q000276:immunology / Q000628:therapy; D015398:Signal Transduction / Q000187:drug effects / Q000276:immunology; D014315:Triterpenes / Q000494:pharmacology*
chemical_list: D018984:Epitopes, T-Lymphocyte; D011518:Proto-Oncogene Proteins; D050796:STAT3 Transcription Factor; C494087:Stat3 protein, mouse; D014315:Triterpenes; D011505:Protein-Tyrosine Kinases; C507926:Jak2 protein, mouse; D053614:Janus Kinase 2; C038106:cucurbitacin I