期刊
BRAIN RESEARCH BULLETIN
卷 80, 期 6, 页码 331-336出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.brainresbull.2009.09.005
关键词
Acute stress; Corticosterone; Immobility response; Rat
资金
- Instituto Politecnico Nacional (SIP-IPN) [20080779]
- Consejo Nacional de Ciencia y Tecnologia [SNI-16541, 202231, SNI-957]
The immobility response is an innate antipredatory behavior in a broad variety of species. The immobility response varies in its postural components but in general is characterized by an absence of movement and a relative unresponsiveness to stimuli. Experimentally in rats, clamping the neck followed by body inversion and manual restrain elicits a response called immobility by clamping the neck. Stress reactions protect animals against predators and are characterized by activation of the sympathetic and hypothalamic-pituitary-adrenal systems. However, in mammals, the role of acute stress as a modulator of immobility response has been less studied. The aim of our study was to assess the effects of acute stress and the injection of corticosterone (5 mg/kg, ip) on immobility by clamping the neck in rats. We observed that either previous acute stress caused by forced exposure to elevated open platform or application of a heat-pain stimulus to the rat's tail during the immobility increased the duration of the immobility response caused by clamping the neck. Also, the corticosterone produced a rapid increase (15 min after injection) in the duration of this immobility response. Our results show that the acute stress, in rats, is a facilitator of the immobility response and suggest a possible nongenomic rapid action of corticosterone over brain structures that control this behavior. (C) 2009 Elsevier Inc. All rights reserved.
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