Abstract:
:Acetonylgeraniin, an active principle isolated from the seeds of Euphoria longana Lam. (Sapindaceae), reversed the fall in arterial blood pressure in conscious hypertensive rats (SHRs) with orthostatic hypotension induced by injection of hexamethonium into animals subjected to 90 degrees head-up tilts for 60 seconds. However, acetonylgeraniin failed to affect prazosin-induced orthostatic hypotension. Plasma noradrenaline (NA) and mean blood pressure were elevated dose-dependently by an intravenous injection of acetonyl-geraniin into the rats; this increase in blood pressure was totally abolished by prazosin. Failure of hexamethonium or pentolinium, the blockers of ganglionic nicotinic receptors, to influence the NA releasing action of acetonylgeraniin ruled out the participation of ganglionic stimulation. This NA-releasing action of acetonylgeraniin was, however, totally abolished by the inhibitors of noradrenergic nerve terminals, guanethidine or bretylium. Also, the activity of this tannin was not modified by adrenalectomy. Thus, a direct release of NA from the noradrenergic nerve terminals by acetonylgeraniin seems responsible for the reversing of orthostatic hypotension.
journal_name
Planta Medjournal_title
Planta medicaauthors
Hsu FL,Lu FH,Cheng JTdoi
10.1055/s-2006-959487subject
Has Abstractpub_date
1994-08-01 00:00:00pages
297-300issue
4eissn
0032-0943issn
1439-0221journal_volume
60pub_type
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