title: Inhibition of dendritic cell differentiation and accumulation of myeloid-derived suppressor cells in cancer is regulated by S100A9 protein.
abstract: Accumulation of myeloid-derived suppressor cells (MDSCs) associated with inhibition of dendritic cell (DC) differentiation is one of the major immunological abnormalities in cancer and leads to suppression of antitumor immune responses. The molecular mechanism of this phenomenon remains unclear. We report here that STAT3-inducible up-regulation of the myeloid-related protein S100A9 enhances MDSC production in cancer. Mice lacking this protein mounted potent antitumor immune responses and rejected implanted tumors. This effect was reversed by administration of wild-type MDSCs from tumor-bearing mice to S100A9-null mice. Overexpression of S100A9 in cultured embryonic stem cells or transgenic mice inhibited the differentiation of DCs and macrophages and induced accumulation of MDSCs. This study demonstrates that tumor-induced up-regulation of S100A9 protein is critically important for accumulation of MDSCs and reveals a novel molecular mechanism of immunological abnormalities in cancer.
authors.affiliation: H. Lee Moffitt Cancer Center, University of South Florida, Tampa, FL 33612, USA.
authors.forename: Pingyan
authors.initials: P
authors.lastname: Cheng
authors.forename: Cesar A
authors.initials: CA
authors.lastname: Corzo
authors.forename: Noreen
authors.initials: N
authors.lastname: Luetteke
authors.forename: Bin
authors.initials: B
authors.lastname: Yu
authors.forename: Srinivas
authors.initials: S
authors.lastname: Nagaraj
authors.forename: Marylin M
authors.initials: MM
authors.lastname: Bui
authors.forename: Myrna
authors.initials: M
authors.lastname: Ortiz
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Nacken
authors.forename: Clemens
authors.initials: C
authors.lastname: Sorg
authors.forename: Thomas
authors.initials: T
authors.lastname: Vogl
authors.forename: Johannes
authors.initials: J
authors.lastname: Roth
authors.forename: Dmitry I
authors.initials: DI
authors.lastname: Gabrilovich
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells / Q000166:cytology / Q000502:physiology; D040502:Calgranulin B / Q000235:genetics / Q000378:metabolism*; D002454:Cell Differentiation / Q000502:physiology*; D003713:Dendritic Cells / Q000166:cytology / Q000502:physiology*; D053595:Embryonic Stem Cells / Q000166:cytology / Q000502:physiology; D005260:Female; D006412:Hematopoietic Stem Cells / Q000166:cytology / Q000502:physiology; D008264:Macrophages / Q000166:cytology / Q000502:physiology; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008822:Mice, Transgenic; D022423:Myeloid Cells / Q000166:cytology / Q000502:physiology*; D041681:NIH 3T3 Cells; D009369:Neoplasms / Q000276:immunology* / Q000473:pathology; D010641:Phenotype; D017382:Reactive Oxygen Species / Q000378:metabolism; D050796:STAT3 Transcription Factor / Q000235:genetics / Q000378:metabolism
chemical_list: D040502:Calgranulin B; D017382:Reactive Oxygen Species; D050796:STAT3 Transcription Factor