BLOCKADE OF EFFECT OF STRESS ON RISK ASSESSMENT BEHAVIOR IN MICE BY ABETA-1 ADRENOCEPTOR ANTAGONIST

Previous studies have shown that acute stress impairs risk assessment behavior in mice. The present study was undertaken to determine the ro le of beta adrenoceptors, which are known to be stimulated by stress, in this effect. Mice were treated with either a beta-1 antagonist, bet axolol, a beta-2 antagonist, ICI 118551, an alpha-1 antagonist, prazos in, or an alpha-2 antagonist, yohimbine, and 30 min later were subject ed to a 1-h session of restraint stress. Thirty minutes after the stre ss the animals were tested for the entry latency, number of headpokes prior to entry, and the path of entry into a white open field from a s mall dark box. In agreement with previous findings, stress was found t o markedly reduce risk assessment behaviors as reflected by a reduced entry latency, a reduced number of headpokes and a changed entry path from wall hugging to central entry. Betaxolol was found to prevent all of the above effects of stress dose dependently, whereas ICI 118551, prazosin, and yohimbine had no reversal effects. It is concluded that beta-1 receptor activation and possibly brain glycogen depletion is in volved in the effects of stress on risk assessment behavior. Copyright (C) 1996 Elsevier Science Inc.