Cl^-在鼻咽癌细胞调节性容积回缩中的作用

Role of Cl^- in regulatory volume decrease of nasopharyngeal carcinoma cells

目的 :研究鼻咽癌细胞的调节性容积回缩 (RVD)及Cl-在其中所起的作用。方法 :活细胞图像分析低分化鼻咽癌细胞 (CNE - 2Z)在细胞外低渗刺激时的细胞容积改变 ,用离子置换法和通道阻断法阐明Cl-在RVD中所起的作用。结果 :细胞外低渗刺激使细胞膨胀并诱发RVD。在 16 0 - 2 30mOsmol/L范围内 ,RVD与细胞膨胀程度正相关。用葡萄糖酸取代灌流液Cl-时RVD增强 ,细胞内Cl-耗竭时RVD消失。氯通道阻断剂阻抑RVD ,但不同的阻断剂对RVD的阻抑率有明显差异。结论 :Cl-是CNE - 2Z细胞RVD的关键离子 ,Cl-通道激活 ,Cl-外流是RVD的主要机制。

AIM: To clarify the role of Cl - in regulatory volume decrease (RVD) of nasopharyngeal carcinoma cells (CNE-2Z).METHODS: Analysis of living cell images was used to detect the volume changes following exposure to hypotonic solution. Iron replacement and block of iron channels were also applied in the present study. RESULTS: Extracelluar hypotonic treatment made the cells swell and induced RVD. The RVD was correlated positively to the swelling in the range of 160-230 mOsmol/L. Substitution of gluconate for Cl - in perfusing solutions markedly increased RVD. Depletion of cellular Cl - abolished, and chloride channel blockers inhibited RVD. CONCLUSION: Cl - is the key iron to establish the RVD in CNE-2Z cells. Activation of Cl - channels and Cl - efflux are the major mechanisms of RVD.