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Drugs Acting on Autonomic Ganglia: Stimulants01:23

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Ganglionic stimulants activate NM nicotinic receptors in autonomic ganglia, falling into two categories: nicotine mimetics [e.g., lobeline, dimethylpiperazine, tetramethylammonium] and muscarinic receptor agonists [e.g., muscarine, methacholine]. The first category's action is rapid and blocked by nicotinic receptor antagonists, while the second category's action is delayed and blocked by atropine-like agents. Nicotine, an alkaloid, affects the heart rate by stimulating...
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The autonomic nervous system (ANS) is a critical component of the peripheral nervous system, primarily responsible for regulating involuntary bodily functions and maintaining homeostasis. It functions in tandem with the central nervous system (CNS) to seamlessly coordinate various physiological processes without the need for conscious control.
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Antimuscarinic drugs have various therapeutic applications by inhibiting parasympathetic stimulation in different systems. Here are the key therapeutic uses of antimuscarinics:    
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Cholinergic neurotransmission involves the synthesis and the release of acetylcholine (ACh) in order to transmit nerve impulses across the synapse. The process begins with the synthesis of acetyl CoA, a precursor for ACh, from ATP, acetate, and coenzyme A in the mitochondria. Choline, another vital precursor, is transported inside the neuron through choline transporters, including high-affinity choline transporter CHT1, low-affinity choline transporter CTL1, and lower-affinity choline...
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The pharmacological actions of acetylcholine are elicited via its binding to two families of cholinergic receptors or cholinoceptors, namely, muscarinic and nicotinic receptors. Muscarinic receptors are G protein-coupled receptors and have five subtypes, M1–M5. All mAChR subtypes are activated by acetylcholine and blocked by the antagonist, atropine. 
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Myocardial Infarction in Neonatal Mice, A Model of Cardiac Regeneration
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Cholinergic Stimulation by Pyridostigmine Bromide Before Myocardial Infarction Prevent Cardiac and Autonomic

C A Barboza1, A R Fukushima2, N Carrozzi3

  • 1School of Physical Education, University of Campinas - UNICAMP, Campinas, SP, Brazil.

Scientific Reports
|February 23, 2019
PubMed
Summary
This summary is machine-generated.

Pre-treatment with pyridostigmine bromide (PYR) before myocardial infarction (MI) in rats preserved autonomic function and reduced inflammation. This approach demonstrated protective effects against cardiac dysfunction and autonomic imbalance post-MI.

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Area of Science:

  • Cardiovascular Research
  • Autonomic Nervous System
  • Inflammation and Immunology

Background:

  • Myocardial infarction (MI) is characterized by inflammatory processes and cardiovascular autonomic imbalance.
  • Acetylcholinesterase inhibitors, like pyridostigmine bromide (PYR), are explored for increasing parasympathetic tone post-MI.

Purpose of the Study:

  • To investigate the potential benefits of administering PYR prior to MI on autonomic function, inflammatory response, and cardiac function.
  • To evaluate left ventricular function, baroreflex sensitivity, autonomic modulation, and inflammatory profile in rats pre-treated with PYR before MI.

Main Methods:

  • Male Wistar rats were treated with PYR for 60 days before undergoing MI.
  • Post-MI, evaluations included autonomic and ventricular function, along with systemic, left ventricle, and adipose tissue inflammatory profiles.

Main Results:

  • PYR pre-treatment prevented heart rate increase, systolic dysfunction, and reduced baroreflex sensitivity post-MI.
  • Treated rats showed preserved pulse interval variance, RMSSD, blood pressure, and parasympathetic modulation compared to controls.
  • Reduced inflammatory markers (IFN-γ, IL-6, IL-1β) and increased IL-10 expression in the left ventricle were observed in PYR-treated rats.

Conclusions:

  • Prior administration of PYR effectively prevents autonomic nervous system impairment following MI.
  • These protective effects are potentially linked to attenuated inflammatory factor expression and reduced cardiac dysfunction.