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Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
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Insulin action is mediated through a receptor tyrosine kinase, akin to the IGF-1 receptor. The number of receptors per cell varies significantly, from 40 on erythrocytes to 300,000 on adipocytes and hepatocytes. The insulin receptor consists of linked α/β subunit dimers, forming a heterotetramer glycoprotein with two extracellular α subunits and two β subunits spanning the membrane. The α subunits inhibit the inherent tyrosine kinase activity of the β subunits, but...
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Updated: May 15, 2025

Mechanism of Regulation of Adipocyte Numbers in Adult Organisms Through Differentiation and Apoptosis Homeostasis
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Activin Actions in Adipocytes.

Luisina Ongaro1, Daniel J Bernard1

  • 1Department of Pharmacology and Therapeutics, McGill University, Montreal, QC H3G 1Y6, Canada.

The Journal of Clinical Endocrinology and Metabolism
|April 10, 2025
PubMed
Summary
This summary is machine-generated.

Activins, particularly activin E, play a key role in regulating fat metabolism and body weight. Understanding these mechanisms may lead to new obesity treatments beyond current drugs.

Keywords:
TGFβadiposeligandlipolysisobesity

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Area of Science:

  • Endocrinology and Metabolism
  • Molecular Biology
  • Obesity Research

Background:

  • Obesity is a global health issue with complex causes.
  • Current weight loss drugs like GLP-1 receptor agonists have limitations including cost, availability, side effects, and continuous use.
  • Novel therapeutic targets for obesity are needed.

Purpose of the Study:

  • To review the role of transforming growth factor β (TGFβ) superfamily ligands, specifically activins, in adiposity.
  • To highlight the function of the hepatokine activin E in lipolysis and diet-induced obesity.

Main Methods:

  • Literature review of recent research on activins and obesity.
  • Focus on studies investigating activin E's impact on fat cells (adipocytes) and metabolic processes.
  • Analysis of activin E's role in lipolysis and response to high-fat diets.

Main Results:

  • Activins influence adipocyte proliferation, differentiation, and function.
  • Activin E is identified as a key hepatokine involved in regulating fat metabolism.
  • Activin E impacts lipolysis and contributes to diet-induced obesity models.

Conclusions:

  • Activins, especially activin E, are important regulators of adiposity.
  • Further research into activin E pathways could reveal new therapeutic strategies for obesity.
  • Targeting activin E may offer an alternative approach to weight management.