SDC4(Syndecan-4)是一种跨膜蛋白多糖,属于Syndecan基因家族(包含SDC1、SDC2、SDC3和SDC4四个成员)。该家族共性在于其核心蛋白均带有共价连接的硫酸乙酰肝素(HSPG)和硫酸软骨素(CSG)糖链,通过糖链与细胞外基质、生长因子及细胞黏附分子相互作用,参与细胞黏附、迁移、增殖和信号转导等过程。SDC4的生物学功能集中在调控细胞-基质相互作用,尤其在成纤维细胞和内皮细胞中,它通过整合素协同激活蛋白激酶Cα(PKCα)和RhoGTP酶通路,影响细胞骨架重组和机械应力响应。其表达产物作为共受体(co-receptor)可结合纤维连接蛋白(fibronectin)、生长因子(如FGF2、VEGF)及炎症因子(如CXCL12),参与伤口修复、血管生成和免疫调节。主要作用位点包括细胞膜、黏着斑(focal adhesion)及内吞体(endosome)。SDC4突变可能导致黏着斑形成障碍,表现为细胞迁移异常,与动脉粥样硬化、肿瘤转移(如乳腺癌、结肠癌)和纤维化疾病相关。过表达SDC4会增强PKCα信号,促进肿瘤细胞侵袭和血管增生,而敲低表达则导致伤口愈合延迟、血管发育缺陷。在疾病中,SDC4在心肌梗死后的心肌细胞中上调,通过调节炎症反应影响组织修复;在骨关节炎中,其表达降低导致软骨细胞外基质降解加速。该基因家族成员均具有保守的跨膜区和胞内结构域(C1、C2),但SDC4的胞内段含有独特的PKCα结合位点,使其在机械信号转导中具有特异性功能。
The protein encoded by this gene is a transmembrane (type I) heparan sulfate proteoglycan that functions as a receptor in intracellular signaling. The encoded protein is found as a homodimer and is a member of the syndecan proteoglycan family. This gene is found on chromosome 20, while a pseudogene has been found on chromosome 22. [provided by RefSeq, Jul 2008]
由该基因编码的蛋白质是一种跨膜(I型)的硫酸乙酰肝素蛋白多糖,其功能如同在细胞内信号传导的受体。所编码的蛋白质被发现作为同二聚体,并且是聚糖蛋白聚糖家族中的一员。该基因在20号染色体中发现,而假已经在[由RefSeq的,2008年7月提供] 22号染色体发现
SDC4基因(以及对应的蛋白质)的细胞分布位置:
SDC4基因的本体(GO)信息:
| 名称 |
|---|
| 4512 ECM-receptor interaction [PATH:hsa04512] |
| 4514 Cell adhesion molecules (CAMs) [PATH:hsa04514] |
| 5205 Proteoglycans in cancer [PATH:hsa05205] |
| 名称 |
|---|
| A tetrasaccharide linker sequence is required for GAG synthesis |
| Chondroitin sulfate/dermatan sulfate metabolism |
| Defective B3GAT3 causes JDSSDHD |
| Defective B4GALT7 causes EDS, progeroid type |
| Defective EXT1 causes exostoses 1, TRPS2 and CHDS |
| Defective EXT2 causes exostoses 2 |
| Disease |
| Diseases associated with glycosaminoglycan metabolism |
| Diseases of glycosylation |
| Extracellular matrix organization |
| Glycosaminoglycan metabolism |
| Heparan sulfate/heparin (HS-GAG) metabolism |
| HS-GAG biosynthesis |
| HS-GAG degradation |
| Metabolism of carbohydrates |
| Non-integrin membrane-ECM interactions |
| Retinoid metabolism and transport |
| Syndecan interactions |
| Visual phototransduction |
| 疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
| Non-Small Cell Lung Carcinoma | 0.12 | 1 | 0 | CTD_human |
| Bacterial Infections | 0.08 | 1 | 0 | RGD |
| Varicose Ulcer | 0.005362824 | 1 | 0 | BeFree_GAD_LHGDN |
| Leg Ulcer | 0.00272435 | 1 | 0 | LHGDN |
| Atherosclerosis | 0.002367032 | 1 | 0 | GAD |
| Psoriasis | 0.002367032 | 1 | 1 | GAD |
| melanoma | 0.000542884 | 2 | 0 | BeFree |
| Degenerative polyarthritis | 0.000542884 | 2 | 0 | BeFree |
| Dermatologic disorders | 0.000271442 | 1 | 0 | BeFree |
| Colon Carcinoma | 0.000271442 | 1 | 0 | BeFree |
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