ITGB4(整合素β4)是整合素家族的重要成员,属于β亚基家族。整合素是一类跨膜受体蛋白,介导细胞与细胞外基质(ECM)的黏附,参与细胞信号传导、迁移、增殖和分化等过程。ITGB4通常与α6亚基(ITGA6)结合形成α6β4整合素异源二聚体,主要在上皮细胞和某些肿瘤细胞中表达,尤其在基底膜中发挥关键作用。ITGB4的独特之处在于其较长的胞内结构域,含有多个磷酸化位点,能与细胞骨架蛋白(如角蛋白)相互作用,形成半桥粒结构,维持上皮细胞的机械稳定性和极性。 ITGB4的功能异常与多种疾病相关。突变可导致遗传性大疱性表皮松解症(JEB),表现为皮肤脆弱、水疱形成,甚至影响胃肠道和泌尿系统。此外,ITGB4在多种癌症(如乳腺癌、肺癌、胰腺癌)中过表达,促进肿瘤侵袭和转移,因其能激活PI3K/AKT和Ras/MAPK等促生存信号通路。相反,ITGB4表达降低可能影响上皮组织的完整性,导致伤口愈合障碍或黏膜病变。 ITGB4的过表达可能增强肿瘤细胞的迁移和耐药性,同时影响其他基因(如MMPs、VEGF)的表达,促进血管生成和ECM降解。而敲低ITGB4可能抑制肿瘤进展,但也会削弱正常上皮的屏障功能。该基因属于整合素β亚家族,成员(如ITGB1、ITGB3等)均含有保守的胞外配体结合域和胞内信号转导结构,但ITGB4因较长的胞内尾端而具有独特的半桥粒组装功能。研究ITGB4有助于开发靶向癌症治疗或遗传性皮肤病的策略。
Integrins are heterodimers comprised of alpha and beta subunits, that are noncovalently associated transmembrane glycoprotein receptors. Different combinations of alpha and beta polypeptides form complexes that vary in their ligand-binding specificities. Integrins mediate cell-matrix or cell-cell adhesion, and transduced signals that regulate gene expression and cell growth. This gene encodes the integrin beta 4 subunit, a receptor for the laminins. This subunit tends to associate with alpha 6 subunit and is likely to play a pivotal role in the biology of invasive carcinoma. Mutations in this gene are associated with epidermolysis bullosa with pyloric atresia. Multiple alternatively spliced transcript variants encoding distinct isoforms have been found for this gene. [provided by RefSeq, Jul 2008]
整合素是由α和β亚基的异二聚体,即非共价相关联的跨膜糖蛋白受体。 α和β多肽的不同组合形成,在它们的配体结合特异性不同的复合物。整介导的细胞 - 基质或细胞 - 细胞粘附,以及调节基因表达和细胞生长转导信号。该基因编码的整合素4亚基,为层粘连蛋白的受体。此亚基倾向于用α-6亚基相关联,并有可能发挥浸润癌的生物学举足轻重的作用。在这个基因的突变与幽门闭锁表皮松解相关联。已发现该基因编码不同亚型多重选择性剪接转录变异体。 [由RefSeq的,2008年7月提供]
ITGB4基因(以及对应的蛋白质)的细胞分布位置:
ITGB4基因的本体(GO)信息:
名称 |
---|
4151 PI3K-Akt signaling pathway [PATH:hsa04151] |
4512 ECM-receptor interaction [PATH:hsa04512] |
4810 Regulation of actin cytoskeleton [PATH:hsa04810] |
4510 Focal adhesion [PATH:hsa04510] |
5410 Hypertrophic cardiomyopathy (HCM) [PATH:hsa05410] |
5412 Arrhythmogenic right ventricular cardiomyopathy (ARVC) [PATH:hsa05412] |
5414 Dilated cardiomyopathy (DCM) [PATH:hsa05414] |
名称 |
---|
Assembly of collagen fibrils and other multimeric structures |
Cell junction organization |
Cell-Cell communication |
Collagen formation |
Extracellular matrix organization |
Laminin interactions |
Non-integrin membrane-ECM interactions |
Syndecan interactions |
Type I hemidesmosome assembly |
疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
Epidermolysis bullosa with pyloric atresia | 0.563800186 | 17 | 11 | BeFree_CLINVAR_CTD_human_MGD_ORPHANET_UNIPROT |
Adult junctional epidermolysis bullosa (disorder) | 0.56 | 1 | 1 | CLINVAR_CTD_human_MGD_ORPHANET_UNIPROT |
Epidermolysis Bullosa | 0.125991584 | 4 | 0 | BeFree_CTD_human_LHGDN |
Pyloric Atresia | 0.121628651 | 8 | 0 | BeFree_CTD_human |
Junctional Epidermolysis Bullosa | 0.121357209 | 6 | 0 | BeFree_CTD_human |
Epidermolysis Bullosa Simplex With Pyloric Atresia | 0.12 | 0 | 0 | ORPHANET |
Ectodermal Dysplasia | 0.12 | 1 | 0 | CTD_human |
Gliosis | 0.12 | 1 | 0 | CTD_human |
Salivary Gland Neoplasms | 0.12 | 1 | 0 | CTD_human |
Epidermolysis Bullosa Simplex | 0.12 | 0 | 0 | CTD_human |
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