CLDN8(Claudin-8)是紧密连接蛋白家族(Claudin家族)的成员之一,该家族由至少27个成员组成,主要功能是形成细胞间的紧密连接结构,维持上皮和内皮细胞的屏障功能,调控细胞旁通透性和离子选择性。CLDN8主要在肾脏、结肠和睾丸等组织中表达,其核心功能是参与细胞间紧密连接的组装,尤其对肾小管和肠上皮的离子选择性屏障至关重要。CLDN8通过与其他Claudin蛋白(如CLDN3、CLDN4)相互作用形成链状结构,选择性调控阴离子(如氯离子)的跨细胞旁途径运输,同时限制水分和溶质的被动扩散。CLDN8基因突变可能导致紧密连接功能异常,与多种疾病相关,例如家族性低镁血症伴高钙尿症和肾结石(由于肾脏镁离子重吸收障碍)、炎症性肠病(肠道屏障破坏)以及某些类型的癌症(如结肠癌中CLDN8表达下调与肿瘤转移相关)。若CLDN8过表达,可能增强上皮屏障的紧密性,减少离子泄漏,但过度抑制旁细胞运输可能影响电解质平衡;而表达降低则会导致屏障功能受损,增加肠道或肾脏的渗透性,引发慢性炎症或电解质紊乱。Claudin家族的共性包括:均具有4个跨膜结构域、两个胞外环(其中第一个环决定离子选择性)以及C端PDZ结合域(用于锚定细胞骨架)。CLDN8的第二个胞外环带有负电荷,是其阴离子选择性的关键。研究还发现,CLDN8在肿瘤中可能发挥双重作用,在某些情况下作为抑癌基因(如抑制结肠癌细胞迁移),而在前列腺癌中过表达却可能促进转移,这种组织特异性差异可能与微环境信号通路交互有关。
This gene encodes a member of the claudin family. Claudins are integral membrane proteins and components of tight junction strands. Tight junction strands serve as a physical barrier to prevent solutes and water from passing freely through the paracellular space between epithelial or endothelial cell sheets, and also play critical roles in maintaining cell polarity and signal transductions. This protein plays important roles in the paracellular cation barrier of the distal renal tubule, and in the paracellular barrier to prevent sodium back-leakage in distal colon. Differential expression of this gene has been observed in colorectal carcinoma and renal cell tumors, and along with claudin-7, is an immunohistochemical marker for the differential diagnosis of chromophobe renal cell carcinoma and renal oncocytoma.[provided by RefSeq, May 2010]
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CLDN8基因(以及对应的蛋白质)的细胞分布位置:
CLDN8基因的本体(GO)信息:
名称 |
---|
4514 Cell adhesion molecules (CAMs) [PATH:hsa04514] |
4530 Tight junction [PATH:hsa04530] |
4670 Leukocyte transendothelial migration [PATH:hsa04670] |
5160 Hepatitis C [PATH:hsa05160] |
名称 |
---|
Cell junction organization |
Cell-Cell communication |
Cell-cell junction organization |
Tight junction interactions |
疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
Muscle Weakness | 0.12 | 1 | 0 | CTD_human |
Down Syndrome | 0.12 | 1 | 0 | CTD_human |
Oxyphilic Adenoma | 0.003267234 | 3 | 0 | BeFree_LHGDN |
Colorectal Neoplasms | 0.00272435 | 1 | 0 | LHGDN |
Renal Cell Carcinoma | 0.00272435 | 1 | 0 | LHGDN |
Hurthle Cell Tumor | 0.000542884 | 2 | 0 | BeFree |
Oncocytic Neoplasm | 0.000542884 | 2 | 0 | BeFree |
Pancreatic carcinoma | 0.000271442 | 1 | 0 | BeFree |
Dermatitis, Atopic | 0.000271442 | 1 | 0 | BeFree |
Pseudohypoaldosteronism, Type I | 0.000271442 | 1 | 0 | BeFree |
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