PSG9

Binds to the small latent transforming growth factor-beta complex, consisting of the N-terminal TGFB1 latency-associated peptide (LAP) and the mature form of TGFB1, thereby leading to the activation of TGFB1. The activation of TGFB1 leads to stimulation of naive CD4(+) T-cells to increase FoxP3 expression and to an increase in the number of FoxP3(+) regulatory T-cells. Induces the differentiation of a suppressive CD4(+)LAP(+)FoxP3(-) T-cell subset. Induces the secretion of TGFB1 in macrophages, but not in activated CD4(+) T-cells. May reduce the expression of several pro-inflammatory cytokines and chemokines by CD4(+) T-cells, including IL2 and IL6..

Function from UniProtKB (Q00887), read 2026-09-23. CC BY 4.0.