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VISTA promotes the metabolism and differentiation of myeloid-derived suppressor cells by STAT3 and polyamine-dependent mechanisms [MDSC_SingleCell]

ABSTRACT: To investigate the function of VISTA in regulating the differentiation of MC38 tumor-associated MDSCs

ORGANISM(S): Mus musculus

PROVIDER: GSE244797 | GEO | 2024/01/02

REPOSITORIES: GEO

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VISTA promotes the metabolism and differentiation of myeloid-derived suppressor cells by STAT3 and polyamine-dependent mechanisms

Project description:To investigate the function of VISTA in regulating the differentiation of BM-derived MDSCs under normoxia conditions

2024-01-02 | GSE244545 | GEO

VISTA promotes the metabolism and differentiation of myeloid-derived suppressor cells by STAT3 and polyamine-dependent mechanisms.

Project description:Myeloid-derived suppressor cells (MDSCs) impair antitumor immune responses. Identifying regulatory circuits during MDSC development may bring new opportunities for therapeutic interventions. We report that the V-domain suppressor of T cell activation (VISTA) functions as a key enabler of MDSC differentiation. VISTA deficiency reduced STAT3 activation and STAT3-dependent production of polyamines, which causally impaired mitochondrial respiration and MDSC expansion. In both mixed bone marrow (BM) chimera mice and myeloid-specific VISTA conditional knockout mice, VISTA deficiency significantly reduced tumor-associated MDSCs but expanded monocyte-derived dendritic cells (DCs) and enhanced T cell-mediated tumor control. Correlated expression of VISTA and arginase-1 (ARG1), a key enzyme supporting polyamine biosynthesis, was observed in multiple human cancer types. In human endometrial cancer, co-expression of VISTA and ARG1 on tumor-associated myeloid cells is associated with poor survival. Taken together, these findings unveil the VISTA/polyamine axis as a central regulator of MDSC differentiation and warrant therapeutically targeting this axis for cancer immunotherapy.

| S-EPMC10851928 | biostudies-literature

VISTA promotes the metabolism and differentiation of myeloid-derived suppressor cells by STAT3 and polyamine-dependent mechanisms

Project description:VISTA promotes the metabolism and differentiation of myeloid-derived suppressor cells by STAT3 and polyamine-dependent mechanisms

| PRJNA1023526 | ENA

VISTA promotes the metabolism and differentiation of myeloid-derived suppressor cells by STAT3 and polyamine-dependent mechanisms [MDSC_SingleCell]

Project description:VISTA promotes the metabolism and differentiation of myeloid-derived suppressor cells by STAT3 and polyamine-dependent mechanisms [MDSC_SingleCell]

| PRJNA1024916 | ENA

RNA of murine macrophages and neutrophils treated with LPS and VISTA

Project description:V-domain immunoglobulin suppressor of T-cell activation (VISTA) has emerged as a unique immunoregulatory receptor on cells of the myeloid lineage. Agonizing VISTA on myeloid cells has recently been demonstrated to have a profound effect on dampening inflammatory responses. VISTA has been proposed to function both as a ligand and as a receptor, yet the role of VISTA as a ligand has been largely ignored. In this experiment, macrophages and neutrophils were isolated from mice and treated with LPS and VISTA to examine the effect of VISTA in dampening acute inflammation.

2022-12-02 | E-MTAB-10856 | biostudies-arrayexpress

Inhibition of lung tumorigenesis by a small molecule CA170 targeting the immune checkpoint protein VISTA

Project description:Expressed on cells of the myeloid and lymphoid lineages, V-domain Ig Suppressor of T cell Activation (VISTA) is an emerging target for cancer immunotherapy. Blocking VISTA activates both innate and adaptive immunity to eradicate tumors in mice. Using a tripeptide small molecule antagonist of VISTA CA170, we found that it exhibited potent anticancer efficacy on carcinogen-induced mouse lung tumorigenesis. Remarkably, lung tumor development was almost completely suppressed when CA170 was combined with an MHCII-directed Kras peptide vaccine. Flow cytometry and single-cell RNA sequencing (scRNA-seq) revealed that CA170 increased CD8+ T cell infiltration and enhanced their effector functions by decreasing the tumor infiltration of myeloid-derived suppressor cells (MDSCs) and Regulatory T (Treg) cells, while the Kras vaccine primarily induced expansion of CD4+ effector T cells. VISTA antagonism by CA170 revealed strong efficacy against lung tumorigenesis with broad immunoregulatory functions that influence effector, memory and regulatory T cells, and drives an adaptive T cell tumor-specific immune response that enhances the efficacy of the Kras vaccine.

2021-06-04 | GSE176091 | GEO

VISTA re-programs macrophage biology through the combined regulation of tolerance and anti-inflammatory pathways

Project description:1) BMDMs treated with anti-VISTA under tolerizing and immunizing conditions. 2) Time course analysis of anti-VISTA-induced alterations in human monocytes after anti-VISTA treatment. 3) Time course analysis of anti-VISTA-induced alterations in BMDMs after anti-VISTA treatment. 4) Single cell ATAC-seq of BMDMs tolerized in the presence or IgG or anti-VISTA.

2020-09-05 | GSE157518 | GEO

VISTA targeting of T cell quiescence and myeloid suppression overcomes adaptive resistance

Project description:VISTA is a premier target for cancer treatment due to its broad expression in many cancer types and enhanced expression upon development of adaptive immune checkpoint resistance. Mechanisms of enhanced anti-tumor immunity were investigated using scRNAseq of the tumor immune infiltrate.

2022-06-26 | GSE206835 | GEO

Myeloid-derived suppressor cells promote epithelial ovarian cancer cell stemness by inducing the CSF2/p-STAT3 signalling pathway

Project description:Myeloid-derived suppressor cells (MDSCs) are known to contribute to tumour immune escape, studies have verified that MDSCs can induce cancer stem cells (CSCs) and promote tumour immune evasion in breast cancers, cervical cancers and glioblastoma. However, the potential function of MDSCs in regulating CSCs in epithelial ovarian cancer (EOC) progression is unknown. Our results indicated that compared to nonmalignant ovarian patients, EOC patients showed a significantly increased proportion of MDSCs in the peripheral blood. In addition, MDSCs dramatically promoted tumour sphere formation, cell colony formation and CSC accumulation, and MDSCs enhanced the expression of the stemness biomarkers NANOG and c-MYC in EOC cells during co-culture. Moreover, the mechanisms by which MDSCs enhance EOC stemness were further explored, and 586 differentially expressed genes were found in EOC cells co-cultured with or without MDSCs; during co-culture, the expression level of colony stimulating factor 2 (CSF2) was significantly increased in EOC cells co-cultured with MDSCs. Furthermore, the depletion of CSF2 in EOC cells was successfully performed, the promotive effects of MDSCs on EOC cell stemness could be markedly reversed by downregulating CSF2 expression, p-STAT3 signalling pathway molecules were also altered, and the p-STAT3 inhibitor could markedly reverse the promotive effects of MDSCs on EOC cell stemness. In addition, the CSF2 expression level was correlated with EOC clinical staging. Therefore, MDSCs enhance the stemness of epithelial ovarian cancer cells by inducing the CSF2/p-STAT3 signalling pathway. Targeting MDSCs or CSF2 may be a reasonable strategy for enhancing the efficacy of conventional treatments.

2020-12-31 | GSE145374 | GEO

VISTA is an activating receptor that binds the proteoglycan Syndecan-2 on monocytes.

Project description:As indicated by its name, V-domain Ig suppressor of T cell activation (VISTA) is thought to primarily serve as an inhibitory protein that limits immune responses. VISTA-antibodies can dampen the effects of several concomitantly elicited activation signals including T cell receptor (TCR) and Toll-like receptor (TLR) activation, but it is currently unclear if VISTA agonism could singly affect immune cell biology. In this study, we discovered two novel agonistic VISTA antibodies and characterized their effects on human peripheral blood mononuclear cells (PBMC) by scRNA/CITE-seq. Both antibodies agonize VISTA in an Fc-functional manner to elicit transcriptional and functional changes in monocytes consistent with activation. We also used pentameric VISTA to identify Syndecan-2 (Sdc2) and several heparan sulfate proteoglycan (HSPG) synthesis genes as novel regulators of VISTA binding to monocytic cells adding further evidence of bidirectional signaling. Together, our study highlights several novel aspects of VISTA biology that have yet to be uncovered in myeloid cells and serves as a foundation for future research.

2021-05-04 | GSE173747 | GEO

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