mdscs

SX-682 是口服有效的 CXCR1和 CXCR2变构抑制剂，可以阻断肿瘤髓系抑制细胞募集并增强 T 细胞活化和抗肿瘤免疫，具有治疗去势抵抗性前列腺癌的潜力。

Baccatin III (Baccatin Ⅲ) 是一种分离自太平洋紫杉树和其近缘种中的天然产物，能够减少 MDSCs 积累并抑制其功能，延缓肿瘤发展进程。

CXCR2 antagonist 3 (compound 11h) is a highly effective antagonist of CXC chemokine receptor 2 (CXCR2). It displays potent activity in inhibiting neutrophil infiltration into the air pouch, with double-digit nanomolar potencies against CXCR2. Moreover, CXCR2 antagonist 3 reduces the infiltration of neutrophils and MDSCs, while enhancing the infiltration of CD3+ T lymphocytes into Pan02 tumor tissues [1].

CB-1158-analog, also known as Numidargistat-analog and INCB01158-analog, is a potent and orally active arginase inhibitor with IC50=89 nM) . CB-1158 blocked myeloid cell-mediated suppression of T cell proliferation in vitro and reduced tumor growth in multiple mouse models of cancer, as a single agent and in combination with checkpoint blockade, adoptive T cell therapy, adoptive NK cell therapy, and the chemotherapy agent gemcitabine. CB-1158 increased tumor-infiltrating CD8+ T cells and NK cells, inflammatory cytokines, and expression of interferon-inducible genes. CB-1158 may be potentially useful in renal cell cancer, breast cancer, non-small cell lung cancer, acute myeloid leukemia, and other tumor types where arginase-secreting MDSCs are known to play an immunosuppressive role. (see ADDITIONAL INFORMATION in this web page for CB-1158 structure confusion).

CSF1R-IN-22 (Compound C19) 作为一种口服有效的CSF-1R选择性抑制剂，其IC50值低于6 nM。该化合物通过促进M2型巨噬细胞分泌CXCL9，从而增强CD8+T细胞的浸润并提升anti-PD-1的抗肿瘤免疫反应，并促进细胞凋亡。此外，CSF1R-IN-22能有效重编程肿瘤相关的M2型巨噬细胞至M1表型，并通过募集CD8+T细胞至肿瘤区域，同时减少免疫抑制性Tregs MDSCs的浸润，从而重塑肿瘤微环境。