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Second messengers in renin secretion.

The American Journal of Physiology

|August 1, 1985

Summary

This summary is machine-generated.

Calcium and cAMP are key regulators of renin secretion. Calcium acts as a primary inhibitor, while cAMP is a stimulator, influencing electrolyte balance and blood pressure.

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Area of Science:

Physiology
Endocrinology

Background:

The renin-angiotensin-aldosterone system is crucial for electrolyte balance and blood pressure regulation.
Renin secretion by the kidneys is the primary determinant of this system's activity.

Purpose of the Study:

To review the roles of intracellular calcium (Ca2+) and cyclic adenosine monophosphate (cAMP) as second messengers in renin secretion.
To establish Ca2+ as the preeminent second messenger, primarily inhibitory, and cAMP as stimulatory.

Main Methods:

Review of existing literature on extracellular first messengers and their effects on intracellular second messenger concentrations.
Analysis of pathways controlling intracellular Ca2+ levels, including efflux (Na-Ca exchange, primary active Ca2+ transport) and influx/mobilization (voltage-sensitive Ca channels, receptor-operated channels).

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Main Results:

Extracellular signals modulate renin secretion by altering intracellular Ca2+ and cAMP levels.
Free ionic calcium (Ca2+) acts as an inhibitory second messenger, while cAMP acts as a stimulatory second messenger.
Ca2+ plays a predominant role in regulating renin secretion.

Conclusions:

Intracellular Ca2+ and cAMP are critical second messengers controlling renin secretion.
The balance between Ca2+ and cAMP signaling dictates the rate of renin release.
Understanding these pathways offers insights into managing electrolyte homeostasis and blood pressure.