首页> 外文期刊>Life sciences >INTRA-ADRENAL 11-BETA-HYDROXYSTEROID DEHYDROGENASE PLAYS A ROLE IN THE REGULATION OF CORTICOSTEROID SECRETION - AN IN VITRO STUDY IN THE RAT
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INTRA-ADRENAL 11-BETA-HYDROXYSTEROID DEHYDROGENASE PLAYS A ROLE IN THE REGULATION OF CORTICOSTEROID SECRETION - AN IN VITRO STUDY IN THE RAT

机译:肾上腺内11-羟基糖皮质激素脱氢酶在调节糖皮质激素分泌中发挥作用-在大鼠中的体外研究

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The expression of 11 beta-hydroxysteroid dehydrogenase (11 beta-HSD) has been demonstrated in the adrenal glands, but until now little attention has been paid on its possible physiologic action. In-situ perfused rat adrenals released under basal conditions, in addition to mineralo- and glucocorticoids, notable amounts of 11-dehydrocorticosterone (DH-B), the inactive form to which corticosterone (the main glucocorticoid in rodents) is converted by 11 beta-HSD. The addition to the prefusion medium of glycyrrhetinic acid, a specific inhibitor of 11 beta-HSD, strongly reduced DH-B release, and simultaneously evoked a moderate rise in both mineralo- and glucocorticoid output. The bolus administration of ACTH strikingly enhanced mineralo- and glucocorticoid secretion, but it significantly depressed DH-B release Rat adrenal microsome preparations possessed 11 beta-HSD activity, that was inhibited by glycyrrhetinic acid. Conversely, ACTH was without any apparent effect, a finding indicating that the in vivo observed ACTH-induced inhibition of adrenal 11 beta-HSD activity is mediated by an indirect mechanism whose elucidation requires further investigation. In conclusion, our present findings suggest that adrenal 11 beta-HSD plays a role in the regulation of steroid secretion in rats under both basal and simulated conditions. [References: 29]
机译:已经在肾上腺中证实了11β-羟基类固醇脱氢酶(11β-HSD)的表达,但是到目前为止,对其可能的生理作用的关注很少。在基础条件下释放的原位灌注大鼠肾上腺,除了矿物质和糖皮质激素外,还有大量的11-脱氢皮质酮(DH-B),这是一种非活性形式,皮质酮(啮齿动物中的主要糖皮质激素)被11β- HSD。向甘草次酸的预融合培养基中添加一种11β-HSD的特异性抑制剂,可大大降低DH-B的释放,并同时引起矿物质和糖皮质激素输出的适度增加。推注ACTH可以显着增强矿物质和糖皮质激素的分泌,但可显着抑制DH-B释放大鼠肾上腺微粒体制剂具有11个β-HSD活性,而甘草次酸抑制了该活性。相反,ACTH没有任何明显的作用,这一发现表明体内观察到的ACTH诱导的肾上腺11β-HSD活性抑制作用是由一种间接机制介导的,其阐明尚需进一步研究。总之,我们目前的发现表明,在基础和模拟条件下,肾上腺11β-HSD在大鼠类固醇分泌的调节中均起作用。 [参考:29]

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