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Related Experiment Videos

Autonomic receptor--effector coupling during post-natal development

R B Robinson1

  • 1Department of Pharmacology, Columbia University, New York, NY 10032, USA. robinsr@cudept.cpmc.columbia.edu

Cardiovascular Research
|February 1, 1996
PubMed
Summary
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Age-dependent changes in myocardial autonomic signal transduction favor excitation in neonates, with distinct alpha 1-adrenergic, beta-adrenergic, and muscarinic responses developing with maturation and innervation.

Area of Science:

  • Cardiovascular Physiology
  • Autonomic Nervous System
  • Molecular Pharmacology

Background:

  • Cardiac autonomic signal transduction undergoes significant age-dependent alterations.
  • Neonatal myocardial responses to autonomic stimulation differ markedly from adult responses.

Purpose of the Study:

  • To investigate age-dependent changes in myocardial alpha 1-adrenergic, beta-adrenergic, and muscarinic signal transduction cascades.
  • To elucidate the role of sympathetic innervation and neuropeptide Y in these developmental changes.

Main Methods:

  • Analysis of signal transduction pathways in neonatal and adult myocardial tissue.
  • Investigation of receptor subtype involvement and G protein coupling.
  • Assessment of the impact of neural factors like sympathetic innervation and neuropeptide Y.

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Main Results:

  • Neonatal hearts exhibit predominantly excitatory responses via alpha 1-adrenergic, beta-adrenergic, and muscarinic pathways.
  • Maturation introduces inhibitory alpha 1-adrenergic responses, influenced by neuropeptide Y and sympathetic innervation.
  • Muscarinic and beta 2-adrenergic responses show complex developmental regulation, with altered sensitivity and functional effects in adults.

Conclusions:

  • Neonatal autonomic receptor systems are primarily geared towards excitation, likely to support cardiac output.
  • Development involves the emergence of inhibitory pathways and modifications in receptor sensitivity and function.
  • Innervation plays a critical role in shaping the mature autonomic control of myocardial function.