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ARTICLES

Vascular responses to vasopressin are tone-dependent in the cerebral circulation of the newborn pig.

W M Armstead, R Mirro, D W Busija, C W Leffler
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https://doi.org/10.1161/01.RES.64.1.136
Circulation Research. 1989;64:136-144
Originally published January 1, 1989
W M Armstead
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R Mirro
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D W Busija
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C W Leffler
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Abstract

The effects of lysine vasopressin (LVP) on pial arteriolar diameter and cortical periarachnoid fluid prostanoid concentrations were investigated in newborn pigs. Chloralose-anesthetized piglets were equipped with closed cranial windows over the parietal cortex for observation of pial arterioles and collection of cerebrospinal fluid (CSF) passing over the cerebral surface. Prostanoids in the CSF were determined by radioimmunoassay. LVP (10-1,000 microU/ml) elicited concentration-dependent increases in pial arteriolar diameter associated with increased levels of 6-keto-prostaglandin (PG)F1 alpha, PGE2, thromboxane B2, and PGF2 alpha. LVP-induced pial arteriolar dilation was unchanged after intravenous indomethacin (5 mg/kg). Conversely, LVP constricts pial arterioles previously dilated by physiological (hemorrhagic hypotension) and pharmacological (topically applied PGE2 or isoproterenol) intervention. This constriction is potentiated by indomethacin. Vascular and biochemical changes elicited by LVP were blocked by intravenous [1-(beta-mercapto-beta beta-cyclopentamethylene propionic acid),2,(O-methyl)-Tyr-AVP] (5 micrograms/kg), a putative V1 receptor antagonist, whereas vascular effects of norepinephrine and U46619, a thromboxane A2 mimic, were unchanged. Therefore, the degree of vascular tone appears to influence responses of the newborn pig cerebral circulation to LVP.

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Circulation Research
January 1, 1989, Volume 64, Issue 1
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    Vascular responses to vasopressin are tone-dependent in the cerebral circulation of the newborn pig.
    W M Armstead, R Mirro, D W Busija and C W Leffler
    Circulation Research. 1989;64:136-144, originally published January 1, 1989
    https://doi.org/10.1161/01.RES.64.1.136

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    Vascular responses to vasopressin are tone-dependent in the cerebral circulation of the newborn pig.
    W M Armstead, R Mirro, D W Busija and C W Leffler
    Circulation Research. 1989;64:136-144, originally published January 1, 1989
    https://doi.org/10.1161/01.RES.64.1.136
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