Abstract:
:Thoracic preganglionic sympathetic nerve activity, blood pressure, heart rate and femoral arterial conductance were recorded in anaesthetised, paralysed cats. Cumulative dose-response curves were constructed for 8-OH-DPAT, ipsapirone and clonidine. All three drugs caused dose-related falls in blood pressure which were associated with minimal changes in femoral arterial conductance. However, 8-OH-DPAT and ipsapirone differed from clonidine in that their hypotensive action was associated with moderate sympathoinhibition and a profound bradycardia, whereas clonidine caused profound sympathoinhibition and, as it did not increase central vagal tone, only a moderate bradycardia. 8-OH-DPAT also caused sympathoinhibition in bi-vagotomised cats and decreased carotid sinus nerve activity along with blood pressure. As 8-OH-DPAT and ipsapirone bind selectively to central 5-HT1A receptors it is concluded that central stimulation of these receptors causes sympathoinhibition and an increase in vagal tone, whereas stimulation of central alpha 2-adrenoceptors causes only sympathoinhibition. In addition, the present data suggest a peripheral vasodilator mechanism may also contribute to the hypotensive effects of 8-OH-DPAT and ipsapirone in the cat. The nature and relative importance of this remains to be established.
journal_name
Eur J Pharmacoljournal_title
European journal of pharmacologyauthors
Ramage AG,Fozard JRdoi
10.1016/0014-2999(87)90431-6subject
Has Abstractpub_date
1987-06-19 00:00:00pages
179-91issue
2eissn
0014-2999issn
1879-0712pii
0014-2999(87)90431-6journal_volume
138pub_type
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