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Related Experiment Videos

Titin develops restoring force in rat cardiac myocytes

M Helmes1, K Trombitás, H Granzier

  • 1Department of Veterinary and Comparative Anatomy, Pharmacology, and Physiology, Washington State University, Pullman 99164-6520, USA.

Circulation Research
|September 1, 1996
PubMed
Summary

Cardiac titin acts as a bidirectional spring, generating restoring force during muscle relaxation. This titin-driven force aids in elastic diastolic recoil and ventricular filling in the heart.

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Area of Science:

  • Cardiovascular Biology
  • Muscle Physiology
  • Biophysics

Background:

  • The molecular mechanisms underlying passive relengthening (restoring force) in cardiac myocytes are not fully understood.
  • Previous research suggested titin's elasticity contributes to restoring force in cardiac myocytes.

Purpose of the Study:

  • To investigate whether titin contributes to the restoring force in cardiac myocytes.
  • To elucidate the role of titin as a bidirectional spring in cardiac muscle function.

Main Methods:

  • Isolated skinned rat cardiac myocytes were subjected to controlled shortening and relaxation.
  • Trypsin treatment was used to selectively degrade titin.
  • Gel electrophoresis and immunoelectron microscopy analyzed protein degradation and titin localization.

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  • Restoring force was measured before and after trypsin treatment.

    • Main Results:

    • Trypsin treatment abolished the ability of myocytes to relengthen and significantly degraded titin.
    • Immunoelectron microscopy confirmed the absence of titin's elastic segment in the I band after treatment.
    • Restoring force was significantly reduced in myocytes with degraded titin.
    • A substantial portion of cardiac restoring force originates intracellularly.

    Conclusions:

    • Cardiac titin generates restoring force in shortened cardiac myocytes, functioning as a bidirectional spring.
    • Titin plays a crucial role in elastic diastolic recoil and ventricular filling by harnessing systolic force.