Intravenous β-endorphin administration fails to alter hypothalamic blood flow in rats expressing normal or reduced nihic oxide synthase activity

Zoltán Benyó, Csaba Szabo, Mária H. Velkei, Béla Bohus, Michael Wahl, Péter Sándor

Research output: Contribution to journalArticle

4 Scopus citations


-Endorphin (β-END) significantly contributes to the maintenance of hypothalamic blood flow (HBF) autoregulation during hemorrhagic hypotension in rats. Recently, several natural and synthetic opioid peptides were reported to induce nitric oxide (NO)-mediated dilation in the cerebrovascular bed. In the present study, the effect of β-END was studied on HBF and hypothalamic vascular resistance (HVR) in vehicle-treated control rats and in rats after the pharmacological inhibition of the NO synthesis by chronic oral application of N(G)-nitro-L-arginine methyl ester. Intravenous β-END administration faired to alter HBF or HVR either in control or in NO-blocked animals, and its transient hypotensive effect was not inhibited by NO blockade, indicating that β-END may not have NO-mediated vasodilator effect in the hypothalamic or in the systemic circulation.

Original languageEnglish (US)
Pages (from-to)733-736
Number of pages4
Issue number4
StatePublished - 1996
Externally publishedYes



  • -Endorphin
  • Cerebral blood flow autoregulation
  • Hypertension
  • Hypothalamus
  • N(G)-Nitro-L-arginine methyl ester (L-NAME)
  • Nitric oxide synthase blockade
  • Rat

ASJC Scopus subject areas

  • Biochemistry
  • Endocrinology
  • Physiology
  • Cellular and Molecular Neuroscience

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