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The role of the sympathetic nervous system in oestrogen-induced hypertension in rats.

Abstract
Albino rats of either sex received chronic ethinyl oestradiol (EO) treatment (1.5 mg kg-1 daily, i.m.) for 3 weeks. Untreated control rats received arachis oil vehicle alone. Chronic EO treatment resulted in elevation of blood pressure in both sexes. Female rats exhibited significantly greater elevation in blood pressure than males. In chronic EO-treated rats pressor responses to low doses (0.5 micrograms kg-1) of noradrenaline were significantly increased, while those to angiotensin II, acetylcholine and isoprenaline were unaltered. Chronic EO treatment also sensitized the vascular bed of the rats' hindquarters to noradrenaline. EO-induced hypertension was associated with significant increase in dopamine-beta-hydroxylase activity of adrenal glands. Complete bilateral adrenalectomy or chemical sympathectomy prevented the development of EO-induced hypertension. It is suggested that chronic treatment of rats with EO induces and maintains hypertension. The peripheral sympathetic system plays an important role in this phenomenon.
AuthorsJ D Bhatt, O D Gulati
JournalBritish journal of pharmacology (Br J Pharmacol) Vol. 89 Issue 4 Pg. 685-91 (Dec 1986) ISSN: 0007-1188 [Print] England
PMID3814904 (Publication Type: Journal Article)
Chemical References
  • Ethinyl Estradiol
  • Dopamine beta-Hydroxylase
  • Norepinephrine
Topics
  • Adrenalectomy
  • Animals
  • Blood Pressure (drug effects)
  • Body Weight (drug effects)
  • Dopamine beta-Hydroxylase (metabolism)
  • Ethinyl Estradiol (toxicity)
  • Female
  • Hypertension (chemically induced, physiopathology)
  • Male
  • Norepinephrine (pharmacology)
  • Rats
  • Regional Blood Flow (drug effects)
  • Sympathectomy, Chemical
  • Sympathetic Nervous System (physiopathology)

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