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Differential protein analysis in rat renal proximal tubule epithelial cells in response to acetazolamide and its relation with the inhibition of AQP1
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- Author:
- No author available
- Journal Title:
- ACTA PHARMACEUTICA SINICA
- Issue:
- 3
- DOI:
- 10.3321/j.issn:0513-4870.2003.03.003
- Key Word:
- 乙酰唑胺;水孔蛋白;肾脏近曲小管上皮细胞;肽质量指纹谱
Abstract： 目的研究乙酰唑胺抑制大鼠肾脏近曲小管上皮细胞水孔蛋白1(aquaporin-1,AQP1)表达的内源性机制.方法将原代培养的大鼠肾脏近曲小管上皮细胞分为两组,一组给予1×10-5 mol*L-1乙酰唑胺,另一组为阴性对照.待细胞长至亚融合状态时裂解细胞,用等电聚焦电泳对裂解物进行差异蛋白筛选,并对差异蛋白作肽质量指纹谱鉴定.结果给乙酰唑胺后细胞中出现两个差异蛋白,其中等电点(pI)为3.8的蛋白给药后的表达减少,数据库检索发现其氨基酸序列与来源于大鼠肝脏和睾丸的刷状缘肌球蛋白有21.4%的相似性;而与来源于大鼠脑的糖原磷酸化酶有27%相似性.另外一条pI为5.5的蛋白被诱导增多,它与来源于大鼠肺脏的α亚型磷脂酰肌醇转移蛋白的相似性为20%.结论乙酰唑胺可能通过影响pI 3.8蛋白或pI 5.5蛋白的表达来抑制AQP1的基因表达.
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