title: Increased shock-induced fighting with supersensitive beta-adrenergic receptors.
abstract: Adult male rats were treated chronically with haloperidol (1 mg/kg) daily or propranolol (10 mg/kg bid) and evaluated for changes in shock-induced fighting. Haloperidol suppressed fighting. Chronic propranolol facilitated fighting when rats were tested eight hours after injection. Acutely, either 5 or 10 mg/kg of d,1-propranolol suppressed shock-induced fighting. Chronic pindolol (10 mg/kg bid) and chronic 1-propranolol (5 mg/kg bid) administration increased fighting. Chronic d,1-propranolol, 1-propranolol or pindolol administration was associated with an increase in Bmax for beta-adrenergic receptors. No change in fighting or Bmax was observed with the chronic administration of d-propranolol (5 mg/kg bid) or metoprolol (10 mg/kg bid). This increase in shock-induced fighting appears to be a behavioral response developing as a consequence of increased beta-adrenergic receptors responding to endogenously released norepinephrine.
mesh_terms: D000374:Aggression / Q000187:drug effects*; D000818:Animals; D001921:Brain / Q000187:drug effects / Q000378:metabolism*; D002462:Cell Membrane / Q000378:metabolism; D004597:Electroshock; D006220:Haloperidol / Q000494:pharmacology*; D006801:Humans; D008297:Male; D008790:Metoprolol / Q000494:pharmacology*; D010869:Pindolol / Q000031:analogs & derivatives / Q000378:metabolism / Q000494:pharmacology*; D011187:Posture; D011433:Propranolol / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains; D011943:Receptors, Adrenergic, beta / Q000187:drug effects / Q000502:physiology*
chemical_list: D011943:Receptors, Adrenergic, beta; C011878:iodohydroxybenzylpindolol; D011433:Propranolol; D010869:Pindolol; D008790:Metoprolol; D006220:Haloperidol