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Related Experiment Videos

Myocardial cholinergic signaling changes with age.

E Birk1, R K Riemer

  • 1Department of Pediatrics, University of California, San Francisco 94143-0556.

Pediatric Research
|June 1, 1992
PubMed
Summary

Fetal sheep hearts have more muscarinic receptors linked to a signaling pathway than adult hearts. This difference in cholinergic receptor function may explain developmental changes in autonomic responses.

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Area of Science:

  • Cardiovascular Physiology
  • Autonomic Nervous System Research
  • Developmental Biology

Background:

  • Cholinergic receptors mediate autonomic responses.
  • The phosphoinositide signaling pathway is crucial for cellular signaling.
  • Understanding fetal vs. adult cardiac autonomic control is important.

Purpose of the Study:

  • To investigate the linkage between cholinergic receptors and phosphoinositide signaling in fetal and adult sheep myocardium.
  • To elucidate age-related differences in autonomic response mechanisms.

Main Methods:

  • Cholinergic stimulation with carbachol.
  • Measurement of inositol phosphates production.
  • Saturation binding analysis of muscarinic receptors using 3H-N-methylscopolamine.
  • Receptor subtype determination by Northern blot analysis.

Main Results:

  • Carbachol significantly increased inositol phosphates production in both fetal and adult myocardium, with a much greater response in fetal hearts.
  • Fetal myocardium exhibited significantly higher muscarinic receptor concentration compared to adult myocardium.
  • Northern blot analysis confirmed the presence of muscarinic receptor 2 (MR2) mRNA, with greater expression in fetal hearts, correlating with decreased carbachol-stimulated PLC activity in adults.

Conclusions:

  • Fetal and adult sheep myocardium differ in muscarinic cholinergic receptor concentration and their linkage to calcium-mobilizing signaling pathways.
  • Age-related decreases in MR2 subtype protein and mRNA levels correlate with reduced carbachol-stimulated phosphoinositide signaling in adult myocardium.
  • The studied pathway likely plays a distinct role in fetal versus adult cardiac function.

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