Animal Research: |
Pharmacol Biochem Behav. 1980 May;12(5):735-8. | The alpha-naphthoxyacetic acid-elicited retching involves dopaminergic inhibition in mice.[Pubmed: 7393967] | METHODS AND RESULTS: Alpha-naphthoxyacetic acid (alpha-NOAA), one of the jumping-inducers, elicited a dose-dependent retching behavior at doses ranging from 250 to 550 mg/kg in mice and vomiting at a dose of 550 mg/kg in pigeons. Protoveratrine-A (PV-A, 0.1 mg/kg), a veratrum alkaloid, also induced retching in mice and vomiting in pigeons, while apomorphine (2 mg/kg) produced neither retching in mice nor vomiting in pigeons though it induced feeding in pigeons. The retching elicited by alpha-NOAA or PV-A was not significantly affected by scopolamine, aminooxyacetic acid and gamma-butyrolactone, but was markedly inhibited by apomorphine (2 mg/kg), this inhibitory effect being antagonized without significance by haloperidol which did not itself augment the retching. CONCLUSIONS: These results imply that the retching elicited by alpha-NOAA or PV-A seems to involve at least in part an inhibition of dopaminergic neuron activity. | Journal of Pharmaceutical Practice, 2010, 28(5):348-51. | Effects of Protoveratrine A on cardiovascular and respiratory system in rats.[Reference: WebLink] | To observe the effects of Protoveratrine A(PA) on cardiovascular and respiratory system in rats. METHODS AND RESULTS: The experimental rats(n=40,m-f=1-1) were equally randomized into 4 groups: blank control group and groups of low dose(ig,0.25 mg/kg,single dose of PA),medium dose(ig,0.50 mg/kg,single dose of PA) and high dose(ig,1.00 mg/kg,single dose of PA).Carotid artery cannulation was established following anaesthesia in the rats and the effects of PA on the blood pressure,ECG,respiratory rate and width of rats were measured. The systolic blood pressure,diastolic blood pressure,mean arterial pressure,heart rate and respiratory rate of rats were decreased,the corrected QT(QTc) interval was prolonged and the respiratory width was increased in rats.The dose-effect relationships were observed for all the changes.However,these parameters returned to normal within 150 min. CONCLUSIONS: PA has some effects on cardiovascular and respiratory systems in rats in reducing the blood pressure and heart rate,prolonging the QTc interval,decreasing the respiratory rate and increasing the respiratory width. |
|