Activation of α 2-adrenoceptors suppresses excessive wheel running in the semistarvation-induced hyperactive rat
Identifieur interne : 002D41 ( Main/Exploration ); précédent : 002D40; suivant : 002D42Activation of α 2-adrenoceptors suppresses excessive wheel running in the semistarvation-induced hyperactive rat
Auteurs : T. Wilckens [Allemagne] ; U. Schweiger [Allemagne] ; K. M. Pirke [Allemagne]Source :
- Pharmacology, Biochemistry and Behavior [ 0091-3057 ] ; 1992.
Abstract
Male Wistar rats were housed in cages linked to running wheels and fed on a schedule designed to reduce their body weight by 20–30%. During this period of semistarvation, rats increased their daily running wheel activity (RWA) by up to 30 km/day. RWA could be kept at this level provided that body weight was kept constant. Different α-adrenergic agonists and antagonists were tested for their effects on RWA and it was found that RWA could be suppressed only by agonists that display high affinity for the α2-receptor (clonidine and guanfacine). Neither antagonist had an effect on RWA. Clonidine's inhibiting effect on RWA was prevented by pretreatment with yohimbine, which also has high affinity for α2-receptors. From these results, we conclude that semistarvation-induced hyperactivity can be blocked by α2-agonists. In view of this result and those that were obtained in previous studies, a theoretical model for the development of semistarvation-induced hyperactivity will be presented.
Url:
DOI: 10.1016/0091-3057(92)90402-2
Affiliations:
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<front><div type="abstract" xml:lang="en">Male Wistar rats were housed in cages linked to running wheels and fed on a schedule designed to reduce their body weight by 20–30%. During this period of semistarvation, rats increased their daily running wheel activity (RWA) by up to 30 km/day. RWA could be kept at this level provided that body weight was kept constant. Different α-adrenergic agonists and antagonists were tested for their effects on RWA and it was found that RWA could be suppressed only by agonists that display high affinity for the α2-receptor (clonidine and guanfacine). Neither antagonist had an effect on RWA. Clonidine's inhibiting effect on RWA was prevented by pretreatment with yohimbine, which also has high affinity for α2-receptors. From these results, we conclude that semistarvation-induced hyperactivity can be blocked by α2-agonists. In view of this result and those that were obtained in previous studies, a theoretical model for the development of semistarvation-induced hyperactivity will be presented.</div>
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