Central renin injections: effects on drinking and expression of immediate early genes.
This study investigated the drinking response and the expression of Fos- and Egr-1-immunoreactivity (Fos-ir; Egr-1-ir) in the brain induced by endogenous angiotensin generated by intracerebroventricular (i.c.v.) injection of renin. Renin induced Fos-ir in the subfornical organ (SFO), median preoptic (MnPO), supraoptic and paraventricular nuclei (SON and PVN), area postrema (AP), nuclei of the solitary tract (NTS) and lateral parabrachial nuclei (LPBN). Renin-induced Egr-1-ir exhibited a similar pattern of distribution as that observed for Fos-ir. The dose of i.c.v. renin that induced expression of immediate early gene (IEG) product immunoreactivity also produced vigorous drinking. When renin-injected rats were pretreated with captopril, an angiotensin converting enzyme inhibitor, drinking was blocked. With the same captopril pretreatment, both Fos- and Egr-1-ir in the SFO, MnPO, SON, PVN, AP and LPBN were also significantly reduced.
Xu
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Department of Psychology, University of Iowa, Iowa City 52242, USA.
Johnson
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AK
D000806:Angiotensin-Converting Enzyme Inhibitors / Q000494:pharmacology; D000818:Animals; D001921:Brain / Q000187:drug effects* / Q000378:metabolism; D002216:Captopril / Q000494:pharmacology; D004268:DNA-Binding Proteins / Q000378:metabolism; D004326:Drinking / Q000187:drug effects*; D051766:Early Growth Response Protein 1; D015870:Gene Expression / Q000187:drug effects*; D017781:Genes, Immediate-Early / Q000187:drug effects*; D017874:Immediate-Early Proteins; D007150:Immunohistochemistry; D007276:Injections, Intraventricular; D008297:Male; D016760:Proto-Oncogene Proteins c-fos / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D012083:Renin / Q000494:pharmacology*; D014157:Transcription Factors / Q000378:metabolism
D000806:Angiotensin-Converting Enzyme Inhibitors; D004268:DNA-Binding Proteins; D051766:Early Growth Response Protein 1; C486110:Egr1 protein, rat; D017874:Immediate-Early Proteins; D016760:Proto-Oncogene Proteins c-fos; D014157:Transcription Factors; D002216:Captopril; D012083:Renin