紧密连接蛋白与磷酸化
Tight Junction Proteins and Phosphorylation
DOI: 10.12677/hjbm.2025.151015, PDF,   
作者: 龙运鸿：浙江师范大学生命科学学院，浙江 杭州
关键词: 紧密连接蛋白；磷酸化；PP2A；Tight Junction Protein； Phosphorylation； PP2A
摘要: 紧密连接(Tight Junctions, TJs)在维持上皮和内皮细胞的屏障功能中发挥着至关重要的作用。其主要组成成分包括Claudins、Occludins、ZO蛋白等，这些蛋白通过形成密闭性结构，调节物质的跨膜流动及细胞间的信号传导。磷酸化作为一种关键的翻译后修饰，能够调节紧密连接蛋白的结构与功能，影响其稳定性与细胞极性。特别地，蛋白磷酸酶2A (PP2A)在紧密连接蛋白的去磷酸化过程中发挥着核心作用，调节这些蛋白的功能，进而影响细胞屏障的完整性与细胞间的相互作用。磷酸化通过调节紧密连接蛋白与细胞骨架的结合，控制其动态变化，影响细胞极性、渗透性及迁移等过程。PP2A通过与不同激酶和信号分子的相互作用，精确调节紧密连接蛋白的磷酸化状态，保持细胞功能的稳定。在癌症和炎症等病理状态下，紧密连接蛋白的磷酸化失调与PP2A的功能紊乱密切相关，导致细胞屏障功能的丧失，进而促进肿瘤进展或加剧炎症反应。因此，研究PP2A在紧密连接蛋白磷酸化中的作用，不仅有助于理解细胞间屏障功能的调控机制，还可能为治疗相关疾病提供新的靶向策略。
Abstract: Tight junctions (TJs) play a crucial role in maintaining the barrier function between epithelial and endothelial cells. Its main components include Claudins, Occludins, ZO proteins, etc. These proteins regulate the transmembrane flow of substances and intercellular signal transduction by forming closed structures. Phosphorylation, as a key post-translational modification, can regulate the structure and function of tight junction proteins, affecting their stability and cellular polarity. Specifically, protein phosphatase 2A (PP2A) plays a central role in the dephosphorylation of tight junction proteins, regulating their functions and thereby affecting the integrity of cellular barriers and intercellular interactions. Phosphorylation regulates the binding of tight junction proteins to the cytoskeleton, controlling their dynamic changes and affecting processes such as cell polarity, permeability, and migration. PP2A precisely regulates the phosphorylation status of tight junction proteins and maintains the stability of cellular function through interactions with different kinases and signaling molecules. In pathological states such as cancer and inflammation, the phosphorylation disorder of tight junction proteins is closely related to the dysfunction of PP2A, leading to the loss of cellular barrier function and promoting tumor progression or exacerbating inflammatory reactions. Therefore, studying the role of PP2A in the phosphorylation of tight junction proteins not only helps to understand the regulatory mechanisms of intercellular barrier function, but may also provide new targeted strategies for the treatment of related diseases.
文章引用：龙运鸿. 紧密连接蛋白与磷酸化[J]. 生物医学, 2025, 15(1): 136-145. https://doi.org/10.12677/hjbm.2025.151015

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