Activation of the aldosterone/mineralocorticoid receptor system and protective effects of mineralocorticoid receptor antagonism in retinal ischemia-reperfusion injury

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• 作者：Ye Liu^a ; ^d ; Kazuyuki Hirooka^a ; ^{kazuyk@med.kagawa-u.ac.jp} ; Akira Nishiyama^b ; Bai Lei^b ; Takehiro Nakamura^c ; Toshifumi Itano^c ; Tomoyoshi Fujita^a ; Jinsong Zhang^d ; Fumio Shiraga^a
• 关键词：mineralocorticoid receptor antagonist ; angiotensin II type 1 receptor ; retinal ischemia ; aldosterone
• 刊名：Experimental Eye Research
• 出版年：2012
• 期刊代码：293_00144835
• 类别：med
• 出版时间：March, 2012
• 卷：96
• 期：1
• 页码：116-123
• 文件大小：1843 K

摘要

The purpose of this project was to investigate the effects of the mineralocorticoid receptor antagonist against retinal ischemia-reperfusion injury and identify the aldosterone/mineralocorticoid receptor (MR) system in the rat retina. Retinal ischemia was induced by increasing intraocular pressure to 130聽mmHg. Rats were treated with the angiotensin II type 1 receptor (AT1-R) antagonist (candesartan), MR antagonist (spironolactone), or aldosterone. Retinal damage was evaluated at 7 days after the ischemia by measuring the retinal thickness and the number of retinal ganglion cells. Pretreatment with candesartan, spironolactone, or candesartan and spironolactone significantly inhibited retinal ischemic injury. However, there was no protective effect against retinal ischemia-reperfusion injury provided by the combined aldosterone with candesartan treatment. Additionally, pretreatment with aldosterone alone also did not provide any neuroprotective effects against retinal ischemia-reperfusion injury. When rats were treated via local administration of aldosterone in the absence of ischemia, the number of retinal ganglion cells decreased while the retinal thickness remained unchanged. The present findings demonstrated the existence of a local aldosterone/MR system in the retina. Our results also demonstrated that an MR antagonist can attenuate subsequent ischemic damage in the rat retina.