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. 1994 Sep;94(3):1156–1162. doi: 10.1172/JCI117431

Cyclic guanosine monophosphate is the mediator of platelet-activating factor inhibition on transport by the mouse kidney thick ascending limb.

F Néant 1, M Imbert-Teboul 1, C Bailly 1
PMCID: PMC295187  PMID: 7521885

Abstract

Since we have previously shown a direct inhibitory effect of platelet-activating factor (PAF) on Cl reabsorption in the medullary thick ascending limb of Henle's loop (TAL), the aim of this study was to extend this effect to the whole TAL and to further investigate the signaling pathway involved. In microperfused cortical TALs, PAF significantly decreased Cl reabsorption by 50.3 +/- 6.5%. On the one hand, this effect was not modified in the presence of staurosporine and was not mimicked by phorbol ester; chelating cytosolic Ca by BAPTA/AM failed to suppress the inhibitory effect of PAF on Cl reabsorption; moreover, no significant increase in intracellular Ca concentration could be observed in the presence of PAF on isolated tubules. On the other hand, 8-bromo cyclic GMP mimicked the PAF effect on Cl reabsorption and prevented a further effect of this agent; the PAF effect was significantly reduced by H-8, a cyclic GMP-dependent protein kinase inhibitor; in medullary TALs, PAF significantly increased by twofold cyclic GMP content, an effect inhibited by the PAF antagonist BN 50730, whereas PAF did not significantly modify cAMP content in basal or stimulated conditions. Finally, inhibition of nitric oxide production by NAME or NMMA failed to prevent the effect of PAF on Cl reabsorption. It is concluded that the PAF-induced inhibition of Cl reabsorption in the TAL was mediated by cyclic GMP, likely independent of a nitric oxide synthesis.

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Selected References

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