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  • Title: 5-HT1A receptor activation before acute stress counteracted the induced long-term behavioral effects.
    Author: Rioja J, Santín LJ, García M, Doña A, De Pablos L, Cuadrado MI, Alcalde FJ, González-Barón S, Aguirre JA.
    Journal: Ann N Y Acad Sci; 2004 Jun; 1018():333-8. PubMed ID: 15240387.
    Abstract:
    The long-term behavioral consequences of acute immobilization (IMMO) in rats and the effects of 5-HT(1A) receptor activation (8-OH-DPAT: 0.3 mg/kg, sc) were studied. Corticosterone levels after IMMO with previous 8-OH-DPAT treatment were also studied. Twenty-four hours after IMMO (3 h), rats performed conditioned (passive avoidance) and unconditioned (escape behavior) anxiety tests in the elevated T maze. Pre-exposure to IMMO induces long-term behavioral changes in contrast with control rats. These behavioral alterations include an increase of anxiogenic responses, such as exploratory behavior and passive avoidance response. This effect was counteracted by 8-OH-DPAT pretreatment and reversed by WAY-100635 when administered before 8-OH-DPAT. Serum corticosterone levels increased during the first hour of stress and after 8-OH-DPAT administration. Our results support the hypothesis that involvement of acute stress is crucial in the anxiety-like behaviors and in the potentiation of fear. The activation of 5-HT(1A) receptors counteracted the long-term effects induced by IMMO.
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