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Colocalization of 11β-hydroxysteroid dehydrogenase typeⅠand glucocorticoid receptor and its significance in rat hippocampus
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- Author:
- No author available
- Journal Title:
- ACTA PHYSIOLOGICA SINICA
- Issue:
- 6
- DOI:
- 10.3321/j.issn:0371-0874.2002.06.004
- Key Word:
- 11β-羟基类固醇脱氢酶Ⅰ型;糖皮质激素受体;海马神经元
Abstract： 本研究旨在探讨糖皮质激素代谢酶11β-羟基类固醇脱氢酶Ⅰ型(11β-HSD1)和糖皮质激素受体(GR)在大鼠海马神经元内的共同分布及其意义.用免疫细胞化学方法研究显示, 海马神经元内不仅存在11β-HSD1免疫反应物质, 还存在GR免疫反应物质, 而且11β-HSD1与GR共存于同一个海马神经元内.用Western印迹杂交和薄层层析(TLC)方法研究表明, 地塞米松(DEX)可以促进11β-HSD1蛋白表达及其酶的活性.利用11β-HSD1基因启动子区序列构建的以CAT酶为报告基因的pBLCAT6质粒转染PC12细胞, 证实DEX能够促进CAT酶的表达.以上糖皮质激素的作用均可为GR受体阻断剂RU38486所阻断.结果提示: 糖皮质激素(GC)与GR结合后, 可以作用于与其共存的11β-HSD1基因启动子区, 使11β-HSD1表达增加, 从而使更多的GC代谢产物转化为有活性的GC.此机制可能与保证GC在海马神经元内与亲和力较低的GR结合有关.
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