Technical Articles

MHC-Ia (major histocompatibility complex class Ia) molecules are widely distributed on the surface of nucleated cells and are responsible for presenting endogenous antigen peptides to CD8 ⁺ T cells. When cells are infected with viruses or undergo cancer, MHC-Ia displays abnormal peptide segments as a "danger signal" to activate cytotoxic T cells (CTLs) and initiate immune clearance.

In the adaptive immune response, MHC-Ia molecules are crucial for antigen presentation and CTL activation. While studies often focus on their classical role, a PNAS study by Shi Yufang and Wang Ying's team at the Chinese Academy of Sciences reveals new insights into the interaction between non-classical MHC-Ib molecules and CD8+ T cells.