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Updated: Jul 14, 2026

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

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Published on: June 3, 2016

Relationship between tissue hypoxia and apoptosis: a preliminary observational study.

Bala Venkatesh¹, Glenda Gobe, T John Morgan

¹Department of Intensive Care, Princess Alexandra Hospital, Brisbane, QLD, Australia. bala_venkatesh@health.qld.gov.au

Critical Care and Resuscitation : Journal of the Australasian Academy of Critical Care Medicine

|June 1, 2007

Summary

Reduced tissue oxygen (PO2) below 30mmHg caused significant dysoxia in skin and gut tissues. This study did not identify a specific PO2 threshold for apoptosis development.

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Area of Science:

Physiology
Cell Biology
Pathology

Background:

Tissue hypoxia, a state of insufficient oxygen, is implicated in various pathological conditions.
Understanding the thresholds of tissue oxygen partial pressure (PO2) is crucial for diagnosing and managing conditions involving cellular stress.

Purpose of the Study:

To investigate the relationship between specific levels of tissue hypoxia (PO2 < 30mmHg and < 15mmHg) and the development of dysoxia and apoptosis.
To assess the impact of graded hypoxia and reoxygenation on cellular damage in ileal and cutaneous tissues.

Main Methods:

28 Sprague-Dawley rats were divided into control and experimental groups.
Graded hypoxia was induced, targeting subcutaneous PO2 levels below 30mmHg and 15mmHg.
Apoptosis and dysoxia markers (lactate concentration, energy charge) were analyzed in ileal and cutaneous tissues.

Main Results:

Interstitial PO2 < 30mmHg significantly increased skin and gut lactate concentrations, indicating dysoxia.
Hypoxia led to increased apoptosis in gut villi but not in skin tissues.
No significant correlation was found between gut lactate levels and gut apoptosis.

Conclusions:

Reductions in PO2 to < 30mmHg are associated with significant dysoxic changes in the gut and skin.
A clear PO2 threshold for initiating apoptosis was not identified in this pilot study.
Further research with refined models is needed to pinpoint critical PO2 thresholds for apoptosis.