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Model of Ischemia and Reperfusion Injury in Rabbits
Published on: November 3, 2023
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Cellular basis for burn-mediated cardiac dysfunction in adult rabbits
1Department of Surgery, University of Texas Southwestern Medical Center, Dallas 75235-9031, USA.
The American Journal of Physiology
|December 1, 1996
Summary
Cutaneous burn injury releases factors that harm heart cells. Burn serum and neutrophils significantly reduced cardiac myocyte viability, indicating circulating myocardial depressant factors contribute to cardiac injury after burns.
Area of Science:
- Physiology
- Toxicology
- Cardiovascular Research
Background:
- Cutaneous burn injury is known to impair cardiac contractile function.
- The precise mechanisms underlying this cardiac dysfunction post-burn remain largely undetermined.
Purpose of the Study:
- To investigate the mechanisms by which burn injury affects cardiac myocyte performance.
- To determine the role of circulating factors and inflammatory cells in burn-induced cardiac injury.
Main Methods:
- New Zealand White rabbits underwent a 30% total body surface area scald burn or a sham procedure.
- Serum and polymorphonuclear neutrophils (PMN) were isolated 24 hours post-burn.
- Isolated cardiac myocytes were incubated with burn or sham serum/PMN to assess viability and creatine kinase (CK) release.
Main Results:
- Incubation with burn serum significantly decreased cardiac myocyte viability and increased CK levels.
- Exposure to burn-derived PMN also significantly reduced myocyte viability.
- Control (sham) serum and PMN did not adversely affect myocyte viability or CK levels.
Conclusions:
- Circulating factors present in serum after burn injury contribute to cardiac myocyte injury.
- Burn-associated polymorphonuclear neutrophils also play a role in myocyte damage.
- These findings suggest that myocardial depressant factors released post-burn are significant contributors to cardiac dysfunction.
