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Mechanism of Regulation of Adipocyte Numbers in Adult Organisms Through Differentiation and Apoptosis Homeostasis

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Published on: June 3, 2016

Intermittent hypoxia suppresses adiponectin secretion by adipocytes.

U J Magalang¹, J P Cruff, R Rajappan

¹Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, The Ohio State University, Columbus, Ohio 43210, USA. magalang.1@osu.edu

Experimental and Clinical Endocrinology & Diabetes : Official Journal, German Society of Endocrinology [And] German Diabetes Association

|June 20, 2008

Summary

Intermittent hypoxia in obstructive sleep apnea disrupts adiponectin secretion, increasing cardiovascular disease risk. This study reveals a novel mechanism linking sleep apnea to heart issues via adiponectin dysregulation.

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Published on: May 19, 2023

Area of Science:

Cardiovascular Science
Endocrinology
Sleep Medicine

Background:

Obstructive sleep apnea (OSA) involves cyclic intermittent hypoxia (IH), a risk factor for cardiovascular disease (CVD).
Adiponectin (APN), particularly its high-molecular-weight (HMW) form, has antiatherogenic properties, and low levels are linked to increased CVD risk.

Purpose of the Study:

To investigate the hypothesis that IH dysregulates APN expression and secretion.
To explore a potential mechanism linking OSA to CVD through APN.

Main Methods:

3T3-L1 adipocytes were exposed to simulated IH (12 cycles/h for 6 h/d) for 48 hours.
Control adipocytes were maintained under identical conditions with normal oxygen levels (21% O2).
APN mRNA expression and APN secretion (total and HMW) were measured.

Main Results:

IH significantly upregulated APN mRNA expression in adipocytes.
Despite increased mRNA, IH caused a significant decrease in the secretion of both total and HMW APN.
This suggests a post-transcriptional or post-translational dysregulation of APN secretion.

Conclusions:

Cyclic hypoxia in OSA dysregulates APN secretion from adipocytes, potentially contributing to cardiovascular disease risk.
This study identifies a novel mechanism involving impaired APN release in OSA pathophysiology.
Further research is required to elucidate the precise molecular mechanisms underlying IH-induced reduction in APN release.