Reversal of cirazoline- and phenylpropanolamine-induced anorexia by the alpha 1-receptor antagonist prazosin. Academic Article

abstract

• Phenylpropanolamine (PPA) is a phenethylamine anorectic drug that exerts direct agonist effects predominantly on alpha 1-adrenoceptors, with some alpha 2-adrenergic activity. Microinjections of PPA, as well as the alpha 1-adrenergic receptor agonists cirazoline, methoxamine, and 1-phenylephrine, into rat paraventricular nucleus (PVN) suppress feeding. The present study further evaluates the alpha 1-adrenergic basis of PPA-induced anorexia by examining the effects of systemic injections of the alpha 1-adrenergic antagonist prazosin (PRAZ, 2 and 5 mg/kg, IP) on the anorexia induced by systemic injections of PPA (5, 10, and 20 mg/kg, IP), as well as cirazoline (0.05, 0.1, and 0.2 mg/kg, IP). Although neither PRAZ dose alone altered food intake in the present study, 2 mg/kg PRAZ effectively reversed the feeding-suppressive effects of both PPA and cirazoline. These results strongly support the hypothesis that alpha 1-adrenoceptor stimulation mediates the anorexia induced by drugs such as PPA and cirazoline.

authors

• Wellman, Paul

published proceedings

• Pharmacol Biochem Behav

author list (cited authors)

• Wellman, P. J., & Davies, B. T.

citation count

• 45

complete list of authors

• Wellman, PJ||Davies, BT

publisher

• Elsevier  Publisher

published in

• Pharmacology, Biochemistry and Behavior  Journal

keywords

• Adrenergic Alpha-Agonists
• Animals
• Appetite Depressants
• Drinking
• Eating
• Imidazoles
• Male
• Phenylpropanolamine
• Prazosin
• Rats
• Rats, Inbred Strains

Digital Object Identifier (DOI)

• 10.1016/0091-3057(92)90452-l

start page

• 97

end page

• 100

volume

• 42

issue

• 1

URL

• http://dx.doi.org/10.1016/0091-3057(92)90452-l