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Hydrogen sulfide facilitates carotid sinus baroreceptor activity in anesthetized male rats / 中华医学杂志(英文版)
Chinese Medical Journal ; (24): 1343-1347, 2007.
Article in English | WPRIM | ID: wpr-280436
ABSTRACT
<p><b>BACKGROUND</b>It has been reported that hydrogen sulfide (H(2)S) could relax vascular smooth muscle by direct activation of K(ATP) channels and hyperpolarization of the membrane potential. Recently, our study has shown that H(2)S facilitated carotid baroreflex. This study was conducted to investigate the effect of H(2)S on carotid baroreceptor activity (CBA).</p><p><b>METHODS</b>The functional curve of carotid baroreceptor (FCCB) was constructed and the functional parameters of carotid baroreceptor were measured by recording sinus nerve afferent discharge in anesthetized male rats with perfused isolated carotid sinus.</p><p><b>RESULTS</b>H(2)S (derived from NaHS) 25, 50 and 100 micromol/L facilitated CBA, which shifted FCCB to the left and upward. There was a marked increase in peak slope (PS) and peak integral value of carotid sinus nerve charge (PIV) in a concentration-dependent manner. Pretreatment with glibenclamide (20 micromol/L), a K(ATP) channel blocker, the above effects of H(2)S on CBA were abolished. Pretreatment with Bay K8644 (an agonist of calcium channels, 500 nmol/L) eliminated the role of H(2)S on CBA. An inhibitor of cystathionine gamma-lyase (CSE), DL-propargylglycine (PPG, 200 micromol/L) inhibited CBA in male rats and shifted FCCB to the right and downward.</p><p><b>CONCLUSIONS</b>Our results suggest that exogenous H(2)S exerts a facilitatory role on isolated CBA through opening K(ATP) channels and further closing the calcium channels in vascular smooth muscle. Endogenous H(2)S may activate CBA in vivo.</p>
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Full text: Available Index: WPRIM (Western Pacific) Main subject: Pharmacology / Physiology / Pressoreceptors / 3-Pyridinecarboxylic acid, 1,4-dihydro-2,6-dimethyl-5-nitro-4-(2-(trifluoromethyl)phenyl)-, Methyl ester / Carotid Sinus / Glyburide / Rats, Sprague-Dawley / Alkynes / Glycine / Hydrogen Sulfide Limits: Animals Language: English Journal: Chinese Medical Journal Year: 2007 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Main subject: Pharmacology / Physiology / Pressoreceptors / 3-Pyridinecarboxylic acid, 1,4-dihydro-2,6-dimethyl-5-nitro-4-(2-(trifluoromethyl)phenyl)-, Methyl ester / Carotid Sinus / Glyburide / Rats, Sprague-Dawley / Alkynes / Glycine / Hydrogen Sulfide Limits: Animals Language: English Journal: Chinese Medical Journal Year: 2007 Type: Article