# Protein Kinase A Signaling in Cortisol Production and Adrenal Cushing’s Syndrome

## TL;DR

This paper explores how disruptions in the cAMP-PKA signaling pathway in adrenal cells lead to Cushing’s syndrome, a condition marked by chronically high cortisol levels.

## Contribution

The paper synthesizes mutations and their effects to propose that elevated PKA activity drives adrenal pathology and cortisol overproduction.

## Key findings

- Disruptions in cAMP/PKA signaling in adrenal cells cause chronically elevated cortisol levels, known as Cushing’s syndrome.
- Elevated or misplaced PKA activity contributes to adrenal pathology by increasing cell proliferation and cholesterol processing.

## Abstract

What are the main findings?
Disruptions to cAMP/PKA signaling in adrenal cells can cause chronically elevated cortisol levels, known as Cushing’s syndrome.Synthesis of the mutations and their impacts suggests that elevated and/or ectopic PKA activity drives pathology, including augmented cell proliferation and overactive cholesterol processing.

Disruptions to cAMP/PKA signaling in adrenal cells can cause chronically elevated cortisol levels, known as Cushing’s syndrome.

Synthesis of the mutations and their impacts suggests that elevated and/or ectopic PKA activity drives pathology, including augmented cell proliferation and overactive cholesterol processing.

What are the implications of the main findings?
Elucidation of the specific roles for type I versus type II PKA, as well as which subcellular populations of the kinase control cortisol production and proliferation, will lead to improved understanding of pathology.

Elucidation of the specific roles for type I versus type II PKA, as well as which subcellular populations of the kinase control cortisol production and proliferation, will lead to improved understanding of pathology.

The adenosine 3′,5′-cyclic monophosphate–protein kinase A (cAMP-PKA) signaling pathway is highly utilized in human physiology. It is a crucial component of development and is vital to cellular function in nearly all tissues. Indeed, genetic mutations to cAMP-PKA machinery are found in many pathologies, including multiple cancers, cardiac myxoma, neurodevelopmental disorders, and hypercortisolism. Cyclic AMP and PKA were first identified as vital components in cortisol synthesis over 50 years ago, yet the cellular mechanisms connecting PKA to cortisol production are still not well understood. This article will review evidence for PKA’s roles in adrenal gland zona fasciculata steroidogenesis and consider recent studies of the stress hormone disease adrenal Cushing’s syndrome to synthesize a current model for cAMP-PKA actions in cortisol production.