Related Experiment Videos
[3H]-acetylcholine release from rat atria in chronic chagasic cardiopathy
J Figuerêdo-Silva1, J Coutinho-Netto, R B Bestetti
1Departamento de Patologia, Universidade Federal de Pernambuco, Recife, PE, Brasil.
Insights
Parasympathetic control in rats with Chagas disease cardiomyopathy is impaired. Reduced acetylcholine release from infected rat atria suggests damage to cardiac nerves, impacting heart function.
Area of Science:
- Neurocardiology
- Parasitology
- Pharmacology
Background:
- Chagas disease, caused by Trypanosoma cruzi, can lead to cardiac complications.
- Cardiac autonomic dysfunction is a known complication of Chagas disease.
- The role of parasympathetic nerve function in Chagas cardiomyopathy requires further elucidation.
Purpose of the Study:
- To investigate functional alterations in cardiac parasympathetic control in a rat model of Chagas disease.
- To assess acetylcholine release from atrial tissue of infected rats.
- To correlate acetylcholine overflow with the presence of cardiomyopathy.
Main Methods:
- Isolated superfused rat atria were used.
- Depolarization was induced using 57 mM potassium.
- [3H]-acetylcholine overflow was measured in control and T. cruzi-infected rats.
Main Results:
- Rat atria release [3H]-acetylcholine upon depolarization.
- Depolarization-induced [3H]-acetylcholine overflow was significantly reduced in atria from chronically T. cruzi-infected rats.
- This reduction was observed in rats with electrocardiographically characterized cardiopathy.
Conclusions:
- Chronic T. cruzi infection leads to functional alterations in cardiac parasympathetic control.
- Reduced acetylcholine overflow suggests impaired cholinergic neurotransmission in the infected heart.
- Cardiac ganglion cell destruction is a likely cause of these functional deficits.
Abstract:
Isolated superfused rat atria release [3H]-acetylcholine when depolarized with 57 mM potassium. The depolarization-induced [3H]-acetylcholine overflow was significantly reduced in atria from chronically T. cruzi-infected rats with electrocardiographically characterized cardiopathy. This fact suggests the occurrence of functional alterations of cardiac parasympathetic control in these animals, probably related to cardiac ganglion cell destruction.