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Correlation of mitochondrial function and ischemic contracture

J D Sink, W D Currie, G L Pellom

The Journal of Thoracic and Cardiovascular Surgery

|April 1, 1980

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This study links heart muscle dysfunction during ischemia to specific mitochondrial damage. It shows that as high-energy phosphates deplete, mitochondria structurally and functionally deteriorate, causing ischemic contracture.

Area of Science:

Biochemistry
Cell Biology
Physiology

Background:

Mitochondrial structural and functional changes are known after cardiac ischemia.
Mitochondrial abnormalities linked to acute muscular dysfunction are not well defined.

Purpose of the Study:

To investigate the relationship between high-energy phosphate levels, mitochondrial function, and ischemic contracture in an isolated rat heart model.
To define mitochondrial abnormalities associated with acute muscular dysfunction during ischemia.

Main Methods:

Isolated rat heart subjected to global ischemia.
Measurement of high-energy phosphate content, mitochondrial structure, and mitochondrial function.
Assessment at control, initiation of contracture, completion of contracture, and 20 minutes post-contracture.

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Main Results:

Ischemic contracture initiation and completion correlated with high-energy phosphate depletion.
Specific structural and functional mitochondrial deterioration was observed, corresponding to the degree of contracture.
The isolated heart model effectively demonstrates the interdependence of these parameters.

Conclusions:

Mitochondrial structure and function deteriorate in a manner directly related to the degree of ischemic contracture.
This model is suitable for studying interventions aimed at limiting ischemic injury by examining high-energy phosphate levels, contracture, and mitochondrial function.