CD8B基因编码CD8β链(CD8 beta chain),是CD8共受体(co-receptor)的重要组成部分,属于免疫球蛋白超家族(immunoglobulin superfamily)。CD8分子由α链(CD8A)和β链(CD8B)通过二硫键连接形成异源二聚体,主要表达于细胞毒性T细胞(cytotoxic T cells)和部分自然杀伤T细胞(NKT cells)表面。其功能是与MHC I类分子(主要组织相容性复合体I类)结合,增强T细胞受体(TCR)对抗原的识别信号,并参与T细胞活化。CD8B基因的突变可能导致CD8+ T细胞功能缺陷,表现为免疫应答减弱,与某些自身免疫疾病(如1型糖尿病)或病毒感染(如HIV)的易感性增加相关。若CD8B过表达,可能增强T细胞对抗原的敏感性,但过度活化可能导致自身免疫反应;若表达降低,则可能削弱免疫监视功能,增加肿瘤或病毒感染风险。该基因属于CD8基因家族,成员(CD8A和CD8B)均具有免疫球蛋白样结构域(Ig-like domain),共同参与T细胞的抗原识别与信号转导。CD8B在胸腺(thymus)中参与T细胞发育的选择过程,其表达异常可能影响T细胞亚群平衡。目前研究发现CD8B多态性与慢性病毒感染(如HBV、HCV)的病程进展相关,其机制可能与抗原提呈(antigen presentation)效率改变有关。
The CD8 antigen is a cell surface glycoprotein found on most cytotoxic T lymphocytes that mediates efficient cell-cell interactions within the immune system. The CD8 antigen, acting as a coreceptor, and the T-cell receptor on the T lymphocyte recognize antigens displayed by an antigen presenting cell (APC) in the context of class I MHC molecules. The functional coreceptor is either a homodimer composed of two alpha chains, or a heterodimer composed of one alpha and one beta chain. Both alpha and beta chains share significant homology to immunoglobulin variable light chains. This gene encodes the CD8 beta chain isoforms. Multiple alternatively spliced transcript variants encoding distinct membrane associated or secreted isoforms have been described. A pseudogene, also located on chromosome 2, has been identified. [provided by RefSeq, May 2010]
的CD8抗原是介导的免疫系统内有效的细胞 - 细胞相互作用最细胞毒性T淋巴细胞上的细胞表面糖蛋白。的CD8抗原,作为一个辅助受体,并且在T淋巴细胞的T细胞受体的MHC I类分子的上下文中认出显示通过抗原呈递细胞(APC)的抗原。官能辅助受体可以是两个α链组成的同型二聚体,或一种α和一个β链组成的异源二聚体。 α和β链分享显著的同源性免疫球蛋白可变轻链。这个基因编码的CD8β链同种型。多个可变剪接转录物变体编码不同膜相关或分泌同种型已被描述。假基因,也位于2号染色体上,已被确定。 [由RefSeq的,2010年5月提供]
CD8B基因(以及对应的蛋白质)的细胞分布位置:
CD8B基因的本体(GO)信息:
名称 |
---|
4514 Cell adhesion molecules (CAMs) [PATH:hsa04514] |
4640 Hematopoietic cell lineage [PATH:hsa04640] |
4612 Antigen processing and presentation [PATH:hsa04612] |
4660 T cell receptor signaling pathway [PATH:hsa04660] |
5340 Primary immunodeficiency [PATH:hsa05340] |
名称 |
---|
Adaptive Immune System |
Disease |
HIV Infection |
Host Interactions of HIV factors |
Immune System |
Immunoregulatory interactions between a Lymphoid and a non-Lymphoid cell |
Infectious disease |
Nef Mediated CD8 Down-regulation |
Nef-mediates down modulation of cell surface receptors by recruiting them to clathrin adapters |
The role of Nef in HIV-1 replication and disease pathogenesis |
疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
Progressive supranuclear palsy | 0.122367032 | 1 | 1 | GAD_GWASCAT |
Juvenile arthritis | 0.12 | 1 | 0 | CTD_human |
Tobacco Use Disorder | 0.002367032 | 1 | 0 | GAD |
Chronic Lymphocytic Leukemia | 0.001357209 | 5 | 0 | BeFree |
Lyme Disease | 0.000814326 | 3 | 0 | BeFree |
leukemia | 0.000542884 | 2 | 0 | BeFree |
Lymphoma | 0.000271442 | 1 | 0 | BeFree |
Lupus Erythematosus | 0.000271442 | 1 | 0 | BeFree |
Lupus Vulgaris | 0.000271442 | 1 | 0 | BeFree |
Lupus Erythematosus, Discoid | 0.000271442 | 1 | 0 | BeFree |
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