Effect of phenylarsine oxide on hepatic alpha 1-adrenoreceptor responsiveness. Dissociation between ionotropic and metabolic responses.
Life Sci
; 57(13): 1299-307, 1995.
Article
in En
| MEDLINE
| ID: mdl-7674822
ABSTRACT
The present studies analyze the effect of the tervalent arsenical compound phenylarsine oxide (PAO) on hepatic response to alpha 1-adrenoreceptor stimulation. PAO, while not significantly altering the rate of glycogen breakdown, was found to inhibit many characteristic alpha 1-adrenoreceptor mediated responses including H+ and Ca2+ release, increased energy production, and vascular smooth muscle contraction. PAO inhibited basal gluconeogenesis but failed to inhibit the alpha 1-agonist induced stimulation of glucose production. These data suggest that alpha 1-adrenoreceptor mediated stimulation of metabolism and rates of ion flux across the plasma membrane are separate processes and that exchange in ion homeostasis is not essential to elicit the receptor-mediated metabolic responses. The selective effect of PAO offers an interesting tool for studying the alpha 1-adrenoreceptor signaling mechanisms.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Arsenicals
/
Receptors, Adrenergic, alpha-1
/
Liver
Limits:
Animals
Language:
En
Journal:
Life Sci
Year:
1995
Document type:
Article
Affiliation country:
Spain