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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Calmodulin antagonists stimulate renin release from isolated rat glomeruli.

Effects of calmodulin antagonists on renin release from isolated rat glomeruli were examined. The calmodulin antagonists used were N-(6-aminohexyl)-5-chloro-naphthalene-1-sulfonamide (W-7), triflupromazine and trifluoperazine. These drugs induced renin release from isolated glomeruli in a dose-dependent manner. The threshold concentration for renin release in the calcium-containing medium was 50 microM for W-7, 5 microM for triflupromazine and 2 microM for trifluoperazine respectively. The threshold concentrations were 2-5 times less in the calcium-free medium. The maximum levels of renin release by the three antagonists were similar in both calcium-containing and calcium-free media. In the absence of these antagonists, the basal rate of renin release in the calcium-free medium was markedly higher than in the calcium-containing medium. These results suggest that the calcium-calmodulin system inhibits renin release and that renin release is regulated by a mechanism different from the calcium-stimulated exocytotic mechanism by which many hormones are released.[1]


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