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Related Experiment Videos

Changes in force and calcium sensitivity in the developing avian heart.

R E Godt1, R T Fogaça, T M Nosek

  • 1Department of Physiology and Endocrinology, Medical College of Georgia, Augusta 30912.

Canadian Journal of Physiology and Pharmacology
|November 1, 1991
PubMed
Summary

Chicken heart muscle develops distinct contractile properties, with calcium sensitivity changing significantly during embryonic and post-hatching stages due to troponin isoform shifts.

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Area of Science:

  • Cardiology
  • Developmental Biology
  • Muscle Physiology

Background:

  • Cardiac muscle development involves complex changes in contractile properties.
  • Understanding these changes is crucial for comparative physiology between species.

Purpose of the Study:

  • To characterize the developmental changes in contractile properties of chicken heart muscle.
  • To compare these findings with developing mammalian heart data.

Main Methods:

  • Dissection of small trabeculae from chicken left ventricles at various developmental stages.
  • Measurement of twitch force in intact and chemically skinned trabeculae.
  • Assessment of calcium-activated force and calcium sensitivity.

Main Results:

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  • Twitch force peaked post-hatching and declined in adulthood.
  • Maximal calcium-activated force increased during embryonic development and plateaued.
  • Contractile apparatus showed incomplete activation during normal twitch, with higher calcium sensitivity in embryos, linked to troponin T isoform switching.

Conclusions:

  • Chicken heart muscle contractile properties mature significantly from embryonic to adult stages.
  • Age-dependent changes in calcium sensitivity, influenced by troponin T and I isoform switching, affect cardiac function.
  • Susceptibility to acidosis also changes with development, correlating with troponin I isoform shifts.