MICB (MHC class I polypeptide-related sequence B) is a stress-inducible, heavily glycosylated transmembrane protein encoded by the MICB gene located on chromosome 6p21.33. It functions as a ligand for the NKG2D receptor, which is expressed on natural killer (NK) cells, CD8+ T cells, and 纬未 T cells. Upon binding, MICB activates the cytolytic response of these immune cells, promoting their ability to target and eliminate stressed or transformed cells, such as tumor cells or virus-infected cells. Unlike classical MHC class I molecules, MICB does not associate with 尾-2-microglobulin or bind peptides. Its expression is induced by cellular stress, including DNA damage and viral infections, making it a crucial component in both innate and adaptive immune responses. MICB is widely expressed in various tissues, including lymph nodes and bone marrow, highlighting its role in diverse physiological contexts.
中文
