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Related Experiment Videos

Decrease in heart peptide initiation during head-down tilt may be modulated by HSP-70

V Menon1, J Yang, Z Ku

  • 1Department of Physiology and Biophysics, University of Tennessee Health Science Center, Memphis 38163, USA.

The American Journal of Physiology
|June 1, 1995
PubMed
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Hindlimb suspension rapidly decreases cardiac protein synthesis by inhibiting initiation. This is linked to increased heat-shock cognate/heat-shock protein 70 (HSC/HSP-70) association with nascent polypeptides and reduced ATP levels.

Area of Science:

  • Cardiology
  • Molecular Biology
  • Physiology

Background:

  • Cardiac muscle protein synthesis is crucial for heart function.
  • Hindlimb suspension in rodents is a model for studying unloading effects on muscle.
  • Understanding protein synthesis regulation is key to cardiac health.

Purpose of the Study:

  • To investigate the mechanism behind reduced cardiac protein synthesis during hindlimb non-weight bearing.
  • To identify molecular changes in cardiac muscle under unloading conditions.

Main Methods:

  • Isolation of cardiac polysomes from rats subjected to hindlimb suspension.
  • Analysis of polysome size and RNA content.
  • Measurement of 70-kDa heat-shock cognate/heat-shock protein (HSC/HSP-70) association with polysomes.

Related Experiment Videos

  • Quantification of cardiac adenosine nucleotide pools, including ATP.

    • Main Results:

    • Hindlimb suspension led to decreased RNA in the polysome pool and smaller polysomes, indicating reduced protein synthesis initiation.
    • Cardiac polysomes showed increased association with HSC/HSP-70.
    • A significant decrease in ATP levels was observed after 18 hours of suspension.

    Conclusions:

    • A proposed mechanism suggests that increased HSC/HSP-70 association with nascent polypeptides inhibits protein synthesis initiation.
    • Reduced ATP levels may contribute to HSC/HSP-70 dissociation issues, further impairing protein synthesis.
    • These findings provide insights into cardiac adaptation to unloading and potential therapeutic targets.