结直肠癌
生物
连环素
癌症研究
Wnt信号通路
癌症
连环蛋白
医学
细胞生物学
信号转导
内科学
作者
Toshiyasu Suzuki,Anna Kilbey,Nuria Casa-Rodríguez,Amy Lawlor,Αναστασία Γεωργακοπούλου,Hannah Hayman,Kyi Lai Yin Swe,Anna Nordin,Claudio Cantù,Pierre Vantourout,Rachel A. Ridgway,Ryan M. Byrne,Lei Chen,Michael P. Verzi,David M. Gay,Ester Gil Vázquez,Hayley L. Belnoue-Davis,Kathryn Gilroy,Anne Helene Køstner,Christian Kersten
标识
DOI:10.1158/2326-6066.cir-22-0644
摘要
Abstract Intraepithelial lymphocytes (IEL) expressing γδ T-cell receptors (γδTCR) play key roles in elimination of colon cancer. However, the precise mechanisms by which progressing cancer cells evade immunosurveillance by these innate T cells are unknown. Here, we investigated how loss of the Apc tumor suppressor in gut tissue could enable nascent cancer cells to escape immunosurveillance by cytotoxic γδIELs. In contrast with healthy intestinal or colonic tissue, we found that γδIELs were largely absent from the microenvironment of both mouse and human tumors, and that butyrophilin-like (BTNL) molecules, which can critically regulate γδIEL through direct γδTCR interactions, were also downregulated in tumors. We then demonstrated that β-catenin activation through loss of Apc rapidly suppressed expression of the mRNA encoding the HNF4A and HNF4G transcription factors, preventing their binding to promoter regions of Btnl genes. Reexpression of BTNL1 and BTNL6 in cancer cells increased γδIEL survival and activation in coculture assays but failed to augment their cancer-killing ability in vitro or their recruitment to orthotopic tumors. However, inhibition of β-catenin signaling via genetic deletion of Bcl9/Bcl9L in either Apc-deficient or mutant β-catenin mouse models restored Hnf4a, Hnf4g, and Btnl gene expression and γδ T-cell infiltration into tumors. These observations highlight an immune-evasion mechanism specific to WNT-driven colon cancer cells that disrupts γδIEL immunosurveillance and furthers cancer progression.
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