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Regulation of nitric oxide (NO) formation is critical to ensure maintenance of appropriate cellular concentrations of this labile, signaling molecule. This study investigated the role exogenous and endogenously produced NO have in feeding back to regulate NO synthesis in intact cells. Two NO donors inhibited activation of neuronal NO synthase (nNOS) in response to the muscarinic receptor agonist carbachol...
Two brain soluble fractions, named peaks I and II, which respectively stimulate and inhibit neuronal Na+, K+-ATPase activity, have been isolated by gel filtration in Sephadex G-50. Since cholinergic transmission seems related to such enzyme activity, in this study we evaluated the effect of brain peak I, peak II, a more purified fraction II-E and commercial ouabain, on specific binding of the muscarinic...
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