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pubmed-article:8238387pubmed:abstractTextThe purpose of the present studies was to evaluate directly the role of prostaglandins in macula densa-mediated renin release. Individual juxtaglomerular apparatus specimens were microdissected from rabbit kidney and perfused with a solution containing either high NaCl (Na+ = 141 meq/l; Cl- = 122 meq/l) or low NaCl (Na+ = 26 meq/l; Cl- = 7 meq/l) concentration. With a step decrease in perfusate NaCl (high to low), renin secretion rate was markedly stimulated (from 15.06 to 63.1 nGU/min, P < 0.01), and the response was almost fully reversible. When specimens were bathed with cyclooxygenase inhibitors flurbiprofen (10(-5) M) or flufenamic acid (10(-4) M), this macula densa-activated increase in renin release was largely or completely abolished (flurbiprofen, 3.5-10.5 nGU/min, not significant; flufenamic acid, 9.0-12.3 nGU/min, not significant). Exposing the macula densa to a step increase in perfusate NaCl concentration (low to high) resulted in a significant and reversible suppression of renin secretion in control specimens, but no significant suppression was seen in specimens treated with flufenamic acid. These data provide direct evidence to support the hypothesis that locally produced prostaglandins may act as a primary mediator of the renin response to macula densa activation.lld:pubmed
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pubmed-article:8238387pubmed:articleTitleEffect of prostaglandin synthesis inhibition on macula densa-stimulated renin secretion.lld:pubmed
pubmed-article:8238387pubmed:affiliationDepartment of Physiology, University of Michigan, Ann Arbor 48109.lld:pubmed
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