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Immune-Checkpoint Protein VISTA Regulates Antitumor Immunity by Controlling Myeloid Cell-Mediated Inflammation and Immunosuppression #MMPMID31340983
Xu W; Dong J; Zheng Y; Zhou J; Yuan Y; Ta HM; Miller HE; Olson M; Rajasekaran K; Ernstoff MS; Wang D; Malarkannan S; Wang L
Cancer Immunol Res 2019[Sep]; 7 (9): 1497-1510 PMID31340983show ga
Immune-checkpoint protein V-domain immunoglobulin suppressor of T-cell activation (VISTA) controls antitumor immunity and is a valuable target for cancer immunotherapy. This study identified a role of VISTA in regulating Toll-like receptor (TLR) signaling in myeloid cells and controlling myeloid cell-mediated inflammation and immunosuppression. VISTA modulated the polyubiquitination and protein expression of TRAF6. Consequently, VISTA dampened TLR-mediated activation of MAPK/AP-1 and IKK/NF-kappaB signaling cascades. At cellular levels, VISTA regulated the effector functions of myeloid-derived suppressor cells and tolerogenic dendritic cell (DC) subsets. Blocking VISTA augmented their ability to produce proinflammatory mediators and diminished their T cell-suppressive functions. These myeloid cell-dependent effects resulted in a stimulatory tumor microenvironment that promoted T-cell infiltration and activation. We conclude that VISTA is a critical myeloid cell-intrinsic immune-checkpoint protein and that the reprogramming of tolerogenic myeloid cells following VISTA blockade promotes the development of T cell-mediated antitumor immunity.
|*Immunomodulation[MESH]
|Animals[MESH]
|B7 Antigens/genetics/*metabolism[MESH]
|Cytokines/biosynthesis[MESH]
|Disease Models, Animal[MESH]
|Extracellular Signal-Regulated MAP Kinases[MESH]
|Humans[MESH]
|Immune Tolerance[MESH]
|Immunosuppression Therapy[MESH]
|Inflammation Mediators/metabolism[MESH]
|Inflammation/*etiology/metabolism[MESH]
|Intracellular Signaling Peptides and Proteins/metabolism[MESH]