Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0010200 (cough)
 23,843 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The effects of highly selective agonists of kappa-opioid receptors, namely U-50,488H and U-62,066E, on the capsaicin-induced cough reflex in rats were studied. Intracisternal (i.cist.) injection of U-50,488H and of U-62,066E significantly decreased the number of coughs in a dose-dependent manner. The antitussive potency of i.cist. injection of these two kappa-opioid agonists was similar to that of morphine. Intraperitoneal (i.p.) injection of U-50,488H and of U-62,066E also decreased the number of coughs, again in a dose-dependent manner. The antitussive effects of U-50,488H and U-62,066E were blocked by norbinaltorphimine, an antagonist of kappa-opioid receptors. Methysergide, administered i.cist. (3 nmol), antagonized the antitussive effects of U-50,488H and U-62,066E. However, ketanserin had no effect on the antitussive effects of these kappa-opioid agonists. These data suggest that U-50,488H and U-62,066E exert their antitussive effect on rats through stimulation of kappa-opioid receptors. Furthermore, with respect to the antitussive effects of kappa-opioid agonists, the system that involves 5-HT1 receptors may be more important than the system that involves 5-HT2 receptors.
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PMID:Antitussive effects of two specific kappa-opioid agonists, U-50,488H and U-62,066E, in rats. 227 63

The present study had two basic purposes: to observe the effect of methysergide on the cough reflex and to investigate the effect of methysergide on the antitussive effect of dextromethorphan. Male and female cats were anesthetized with pentobarbital-Na. Respiration and cough reflex were measured using a pneumotachograph via a cannula inserted into the trachea. The cough reflex was elicited by electrical stimuli to the superior laryngeal nerve. Methysergide (3 mg) injected into the vertebral artery increased the number of coughs and respiratory frequency. Dextromethorphan in a dose of 3 mg inhibited the cough reflex. Methysergide (1 and 3 mg) reduced the antitussive effect of dextromethorphan in a dose-dependent manner, but did not inhibit the excitatory effect on respiratory frequency. These findings might indicate that the central serotonergic system has an inhibitory role on the cough reflex and may be related to the antitussive mechanisms of dextromethorphan.
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PMID:Effects of methysergide on the cough reflex. 382 Aug 62

We have studied the role for 5-hydroxytryptamine (5-HT) in the modulation of the cough reflex by examining the effect of a selective 5-HT1A receptor agonist, 8-hydroxy-2-(di-n-propylamino) tetralin (8-OH-DPAT) on cough and respiratory rate in conscious guinea pigs. Animals were placed in a box and exposed to the tussive agent citric acid (0.5 M) for 10 min, 3 min after terbutaline (0.05 mg/kg i.p.) was administered to prevent bronchoconstriction. 8-OH-DPAT inhibited at low doses (0.008 and 0.016 mg/kg) but potentiated at high doses (0.25 and 0.5 mg/kg) the citric acid-induced number of coughs, but dose-dependently increased respiratory rate. Methysergide (0.05-5 mg/kg), a 5HT1 and 5HT2 receptor antagonist, and ketanserin (0.005 mg/kg), a 5HT2 receptor antagonist, had no effects on cough or respiratory rate. Methysergide inhibited the increased cough responses and respiratory rate induced by 8-OH-DPAT at high doses, while ketanserin was without effect. These results suggest that 8-OH-DPAT may induce both in inhibition and activation of the cough reflex, the latter involving central 5HT1-receptor activation.
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PMID:Effect of 5-HT1A receptor agonist, 8-OH-DPAT, on cough responses in the conscious guinea pig. 928 22