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In vitro evaluation of isolated turkey cardiac muscle function
C D Miller1, F B Hembrough, J L Richard
1National Animal Disease Center, US Department of Agriculture, Ames, IA 50010.
Veterinary and Human Toxicology
|December 1, 1988
Summary
Turkey papillary muscles maintained function for 6 hours in a controlled lab setting. Varying calcium levels influenced muscle contraction and relaxation, offering a new system for cardiac drug and toxin testing.
Area of Science:
- Cardiovascular physiology
- Muscle biology
Background:
- Papillary muscles are crucial for heart valve function.
- Understanding their physiological responses in vitro is vital for cardiac research.
Purpose of the Study:
- To establish a functional in vitro assay for turkey papillary muscles.
- To investigate the impact of varying calcium concentrations on papillary muscle mechanics.
Main Methods:
- Utilized isolated turkey papillary muscles in a controlled, oxygenated Krebs-Henseleit solution.
- Maintained physiological conditions (pH-regulated) for up to 6 hours.
- Measured muscle contraction and relaxation parameters under different calcium concentrations.
Main Results:
- Papillary muscle function was sustained for extended periods (up to 6 hours).
- Calcium concentration significantly altered contraction/relaxation velocities, load values, and latencies.
- Demonstrated the viability of the in vitro assay system.
Conclusions:
- The developed assay system provides a reliable platform for studying cardiac muscle function.
- This system can be instrumental in evaluating the effects of cardiac toxins and drugs.
- Highlights the critical role of calcium in modulating papillary muscle contractile properties.