STAT5 and TET2 Cooperate to Regulate FOXP3-TSDR Demethylation in CD4+ T Cells of Patients with Colorectal Cancer

Abstract EN

The tumor-infiltrating Tregs are linked to colorectal cancer progression and outcome.

FOXP3 is regarded as a critical developmental and functional factor for Tregs.

FOXP3-TSDR demethylation is required for stable expression of FOXP3 and maintenance of Treg function.

In our study, we found specific DNA hypomethylation of FOXP3-TSDR in CD4+ T cells from colon tumor tissues as compared with normal colonic tissues.

Moreover, we also found that the expression of STAT5 and TET2 was increased in CD4+ T cells from colon tumor tissues, and the superfluous STAT5 and TET2 binding to FOXP3-TSDR resulted in DNA hypomethylation.

In conclusion, we have demonstrated that excessive amounts of STAT5 may bind more TET2 to the FOXP3-TSDR and upregulate FOXP3 expression via DNA demethylation.

Our study improved the mechanism of FOXP3-TSDR hypomethylation in tumor-infiltrating CD4+ T cells of CRC patients.