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CGRP-mediated cardiovascular effect of nitroglycerin
1Department of Pharmacology, School of Pharmaceutic Sciences, Central South University, Changsha, People's Republic of China. liyj@public.cs.hn.cn
Medical Hypotheses
|April 25, 2003
Summary
Nitroglycerin, an organic nitrate, relaxes blood vessels by releasing nitric oxide (NO). This study reveals that nitroglycerin also activates sensory nerves to release calcitonin gene-related peptide (CGRP), contributing to its cardiovascular effects.
Area of Science:
- Cardiovascular Pharmacology
- Neuroendocrinology
Background:
- Organic nitrates like nitroglycerin induce vascular relaxation via nitric oxide (NO) release.
- Calcitonin gene-related peptide (CGRP) is a key neurotransmitter in cardiovascular tissues with potent vasodilatory and protective effects.
- CGRP release is modulated by autacoids, including NO.
Purpose of the Study:
- To investigate the role of endogenous calcitonin gene-related peptide (CGRP) in the cardiovascular effects of nitroglycerin.
- To elucidate the mechanism by which nitroglycerin influences CGRP release.
Main Methods:
- The study examined the interaction between nitroglycerin, nitric oxide (NO), cyclic guanosine monophosphate (cGMP), and calcitonin gene-related peptide (CGRP) in vascular tissues.
- Investigated the activation of sensory nerve fibers by nitroglycerin.
Main Results:
- Nitroglycerin activates sensory nerve fibers, leading to the release of CGRP.
- This activation is associated with the generation of NO and increased cyclic guanosine monophosphate (cGMP) levels.
- The cardiovascular effects of nitroglycerin are, in part, mediated by the endogenous release of CGRP.
Conclusions:
- Nitroglycerin's vascular effects are partly mediated by the release of CGRP from activated sensory nerves.
- This highlights a novel pathway involving CGRP in the action of organic nitrates.