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[Effect of nitric oxide on rabbit baroreceptor activity]
1Department of Cardiovascular Physiology, Capital University of Medical Sciences, Beijing.
Sheng Li Xue Bao : [Acta Physiologica Sinica]
|June 1, 1997
Summary
Exogenous nitric oxide (NO) excites rabbit carotid sinus baroreceptors (BR) in vitro. This NO-mediated excitation of baroreceptors is not dependent on cyclic guanosine monophosphate (cGMP) signaling.
Area of Science:
- Physiology
- Neuroscience
- Cardiovascular Research
Context:
- Baroreceptors (BR) in the carotid sinus (CS) are crucial for regulating blood pressure.
- The role of nitric oxide (NO) in modulating baroreceptor activity is not fully understood.
- Investigating NO's effect on BR activity provides insights into cardiovascular control mechanisms.
Purpose:
- To investigate the effect of exogenous nitric oxide (NO) on rabbit carotid sinus (CS) baroreceptor (BR) activity in vitro.
- To determine if NO's effect on BR activity is mediated by cyclic guanosine monophosphate (cGMP).
Summary:
- Rabbit carotid sinus nerve (CSN) basal discharge was analyzed, identifying high-amplitude (HA) signals of baroreceptive origin.
- L-arginine (L-arg) and nitroglycerin (NG), NO precursors/donors, dose-dependently excited BR activity (P < 0.01).
- Inhibition of soluble guanylate cyclase (GC) with methylene blue (MB) did not affect basal BR discharge or the response to L-arg/NG, suggesting cGMP-independent NO action.
Impact:
- Demonstrates that exogenous nitric oxide directly excites carotid sinus baroreceptors.
- Suggests a novel, cGMP-independent pathway for NO's influence on baroreceptor function.
- Provides a foundation for understanding NO's role in blood pressure regulation and potential therapeutic targets.