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Related Experiment Videos

Post-natal decrease in chronotropic sensitivity to acetylcholine in rat heart

H Tanaka1, T Matsuda, H Kawada

  • 1Department of Pharmacology, Toho University School of Pharmaceutical Sciences, Chiba, Japan.

General Pharmacology
|January 1, 1994
PubMed
Summary

Rat atrial sensitivity to acetylcholine decreases significantly between 4 and 8 weeks after birth, linked to increased cholinesterase activity. This developmental change impacts cardiac chronotropy in young rats.

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Area of Science:

  • Cardiovascular Physiology
  • Developmental Biology
  • Pharmacology

Background:

  • The chronotropic effects of neurotransmitters are crucial for regulating heart rate.
  • Understanding the developmental changes in cardiac autonomic regulation is important for pediatric cardiovascular health.

Purpose of the Study:

  • To investigate the developmental changes in the negative chronotropic effects of acetylcholine and carbachol on isolated rat right atria.
  • To determine the role of cholinesterase activity in the age-dependent sensitivity to acetylcholine.

Main Methods:

  • Isolated rat right atria from rats at 0, 4, 8, and 16 weeks of age were used.
  • Dose-response curves for acetylcholine and carbachol were generated to assess chronotropic effects.
  • The effect of neostigmine, a cholinesterase inhibitor, on acetylcholine sensitivity was evaluated.

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Main Results:

  • Acetylcholine consistently produced negative chronotropic responses across all ages, with maximum effective concentrations abolishing spontaneous beating.
  • Acetylcholine sensitivity (ED50) was significantly higher in younger rats (0 and 4 weeks) compared to older rats (8 and 16 weeks).
  • Neostigmine shifted the acetylcholine concentration-response curve leftward, with a more pronounced effect at 8 weeks, indicating increased cholinesterase activity post-natally.

Conclusions:

  • The chronotropic sensitivity to acetylcholine in rat atria decreases post-natally between 4 and 8 weeks of age.
  • This decrease is attributed to increased cholinesterase activity during this developmental period.
  • Carbachol sensitivity showed no developmental changes, as it is resistant to cholinesterase hydrolysis.