Abstract:
:There is general agreement that the sympathetic nervous system is involved in the development of hypertension in spontaneously hypertensive rats (SHR). However, in a previous study we established that chronic administration of the selective alpha 1-adrenoceptor antagonist terazosin to SHR failed to prevent this phenomenon. In the present study, we extended that investigation further by examining the effects of another selective alpha 1-antagonist (doxazosin), an alpha 2-adrenoceptor antagonist (yohimbine), and a combination of these agents. Chronic administration of doxazosin and yohimbine produced receptor blockade, as determined by their effect on blood pressure (BP) responses to norepinephrine (NE) and phenylephrine. Chronic administration of either antagonist alone or the two in combination failed to prevent the development of hypertension in SHR, however. These findings suggest that although there may be a need for involvement of the sympathetic nervous system in the development of hypertension in SHR, its influence on this process is not mediated through activation of alpha-adrenoceptors.
journal_name
J Cardiovasc Pharmacoljournal_title
Journal of cardiovascular pharmacologyauthors
Young RL,Jonsson JR,Mano MT,Frewin DB,Head RJdoi
10.1097/00005344-199305000-00015subject
Has Abstractpub_date
1993-05-01 00:00:00pages
786-90issue
5eissn
0160-2446issn
1533-4023journal_volume
21pub_type
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