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Cyclic GMP-linked pathway for renin secretion

A R Noble1, R A Abu-Kishk, M A D'Aloia

  • 1Department of Physiology & Pharmacology, University of Southampton, England, United Kingdom.

Kidney International
|December 1, 1994
PubMed
Summary
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Cyclic guanosine monophosphate (cGMP) acts as a stimulatory second messenger for renin secretion. However, high doses of cGMP-related drugs activate an unknown inhibitory pathway, opposing this effect.

Area of Science:

  • Physiology
  • Molecular Biology
  • Endocrinology

Background:

  • The role of cyclic guanosine monophosphate (cGMP) as a second messenger in regulating renin secretion remains debated.
  • Previous studies have not fully elucidated the direct effects of cGMP on renin release due to indirect influences.

Purpose of the Study:

  • To investigate the precise role of cGMP as a second messenger in renin secretion.
  • To determine the dose-dependent effects of cGMP and related compounds on renin release from rat kidney cortex cells.

Main Methods:

  • Utilized a superfused collagenase-dispersed rat kidney cortex cell preparation to minimize indirect influences.
  • Administered nitroprusside, atriopeptin II, and 8-Br-cGMP to assess dose-response relationships.
  • Employed guanylate cyclase inhibitors (methylene blue, LY83583) and a cGMP-specific phosphodiesterase inhibitor (MB22948).

Related Experiment Videos

Main Results:

  • Nitroprusside, atriopeptin II, and 8-Br-cGMP demonstrated biphasic dose-response curves, stimulating renin release at low doses and inhibiting it at high doses.
  • Methylene blue suppressed baseline renin release at low concentrations but stimulated it at a high concentration.
  • Inhibition of guanylate cyclase attenuated nitroprusside-induced renin release but did not affect 8-Br-cGMP-induced release.

Conclusions:

  • cGMP functions as a physiological stimulatory second messenger for renin release.
  • Low doses of cGMP-related agents mimic this stimulatory action.
  • High doses activate an unidentified inhibitory pathway that counteracts cGMP's stimulatory effect on renin secretion in a dose-dependent manner.