CD28是一种重要的免疫共刺激分子,属于免疫球蛋白超家族(Immunoglobulin Superfamily, IgSF),主要表达于T细胞表面。它的生物学功能是通过与抗原呈递细胞(APC)上的配体B7-1(CD80)和B7-2(CD86)结合,提供T细胞活化的第二信号(共刺激信号),这对T细胞的完全激活、增殖和存活至关重要。CD28的信号传导依赖于其胞内段与PI3K(磷脂酰肌醇3-激酶)和Grb2(生长因子受体结合蛋白2)等适配蛋白的相互作用,最终激活AKT和NF-κB等通路,促进细胞因子(如IL-2)的分泌。CD28的突变或功能缺失会导致T细胞无法有效激活,引发免疫缺陷,例如某些原发性免疫缺陷病(如CD28缺失患者易发生反复感染)。相反,CD28的过度激活可能与自身免疫疾病(如类风湿性关节炎)或慢性炎症相关,因其可能过度增强T细胞反应。CD28属于CD28家族,该家族还包括CTLA-4(细胞毒性T淋巴细胞相关蛋白4)、ICOS(诱导性共刺激分子)和PD-1(程序性死亡受体1)等成员,这些分子均参与调节T细胞免疫应答,但功能不同:CD28和ICOS主要提供正向刺激,而CTLA-4和PD-1则发挥抑制性作用。若CD28表达降低(如衰老或某些病毒感染后),T细胞反应会减弱,导致免疫应答不足;而过表达可能加剧炎症或自身免疫反应。在肿瘤免疫治疗中,针对CD28家族分子(如CTLA-4或PD-1)的抑制剂已被广泛应用,但直接靶向CD28的疗法需谨慎,因其可能引发过度免疫激活。CD28的共刺激机制是免疫检查点研究的核心内容之一,其平衡对维持免疫稳态至关重要。
The protein encoded by this gene is essential for T-cell proliferation and survival, cytokine production, and T-helper type-2 development. Several alternatively spliced transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Jul 2011]
由该基因编码的蛋白质是T细胞增殖和存活,细胞因子的产生,和T辅助2型发展至关重要。几个可变剪接转录变异体的编码不同亚型也发现了这种基因。[由RefSeq的,2011年7月提供]
CD28基因(以及对应的蛋白质)的细胞分布位置:
CD28基因的本体(GO)信息:
名称 |
---|
4514 Cell adhesion molecules (CAMs) [PATH:hsa04514] |
4660 T cell receptor signaling pathway [PATH:hsa04660] |
4672 Intestinal immune network for IgA production [PATH:hsa04672] |
5322 Systemic lupus erythematosus [PATH:hsa05322] |
5323 Rheumatoid arthritis [PATH:hsa05323] |
5320 Autoimmune thyroid disease [PATH:hsa05320] |
5330 Allograft rejection [PATH:hsa05330] |
5332 Graft-versus-host disease [PATH:hsa05332] |
5416 Viral myocarditis [PATH:hsa05416] |
4940 Type I diabetes mellitus [PATH:hsa04940] |
5162 Measles [PATH:hsa05162] |
名称 |
---|
Adaptive Immune System |
CD28 co-stimulation |
CD28 dependent PI3K/Akt signaling |
CD28 dependent Vav1 pathway |
Constitutive Signaling by Aberrant PI3K in Cancer |
Costimulation by the CD28 family |
DAP12 interactions |
DAP12 signaling |
Disease |
Diseases of signal transduction |
Downstream signal transduction |
Downstream signaling events of B Cell Receptor (BCR) |
Downstream signaling of activated FGFR1 |
Downstream signaling of activated FGFR2 |
Downstream signaling of activated FGFR3 |
Downstream signaling of activated FGFR4 |
Fc epsilon receptor (FCERI) signaling |
GAB1 signalosome |
HIV Infection |
Host Interactions of HIV factors |
Immune System |
Infectious disease |
Innate Immune System |
Nef mediated downregulation of CD28 cell surface expression |
Nef-mediates down modulation of cell surface receptors by recruiting them to clathrin adapters |
NGF signalling via TRKA from the plasma membrane |
PI-3K cascade:FGFR1 |
PI-3K cascade:FGFR2 |
PI-3K cascade:FGFR3 |
PI-3K cascade:FGFR4 |
PI3K events in ERBB2 signaling |
PI3K events in ERBB4 signaling |
PI3K/AKT activation |
PI3K/AKT Signaling in Cancer |
PIP3 activates AKT signaling |
Role of LAT2/NTAL/LAB on calcium mobilization |
Signal Transduction |
Signaling by EGFR |
Signaling by ERBB2 |
Signaling by ERBB4 |
Signaling by FGFR |
Signaling by FGFR1 |
Signaling by FGFR2 |
Signaling by FGFR3 |
Signaling by FGFR4 |
Signaling by PDGF |
Signaling by SCF-KIT |
Signaling by the B Cell Receptor (BCR) |
Signalling by NGF |
The role of Nef in HIV-1 replication and disease pathogenesis |
疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
Rheumatoid Arthritis | 0.136611493 | 29 | 0 | BeFree_CTD_human_GAD_LHGDN |
HIV Infections | 0.136034933 | 42 | 0 | BeFree_CTD_human_LHGDN |
Autoimmune Diseases | 0.122985861 | 13 | 0 | BeFree_CTD_human |
Berylliosis | 0.12 | 1 | 0 | CTD_human |
Peripheral T-Cell Lymphoma | 0.12 | 1 | 0 | CTD_human |
Adult T-Cell Lymphoma/Leukemia | 0.12 | 1 | 0 | CTD_human |
Chloracne | 0.12 | 1 | 0 | CTD_human |
Lymphoma, T-Cell, Cutaneous | 0.12 | 2 | 0 | CTD_human |
Lymphopenia | 0.083267234 | 4 | 0 | BeFree_LHGDN_RGD |
Experimental Autoimmune Encephalomyelitis | 0.080271442 | 2 | 0 | BeFree_RGD |
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