Amphetamine Induced Sensitization in Acoustic Startle: Lack of Blockade by Adrenalectomy and Alpha-helical CRF(subscript 9-41)

Der-Yow Chen；K. C. Liang

adrenal cortex ； adrenal medulla ； corticosteroid ； epinephrine ； CRF ； emotion abnormality ； the hypothalamo-pituitary-adrenal axis

The Chinese Journal of Physiology

45卷2期（2002 / 06 / 30）

75 - 87

英文

The present study utilized the acoustic startle response to evaluate the sensitization effect of repeated administration of amphetamine (AMPH). Intraperitoneal injections of AMPH induced a dose-dependent enhancement of startle: 5.0mg/kg caused a robust effect, 1.0 or 3.0mg/kg caused a negligible effect. Sensitization was generated by repeated administration of 5.0mg/kg AMPH for 7 consecutive days and tested on the 8th and 9th days with challenge of saline and 3mg/kg AMPH. The results showed that rats receiving chronic injections of AMPH, but not saline, showed significant enhancement of startle to 3.0mg/kg AMPH, and this effect lasted at least for a month. To explore the role of the hypothalamopituitary-adrenal axis in this sensitization effect, rats received adrenalectomy, adrenal demedullation, or sham adrenal operation, and then were subjected to acute or chronic injections of 5.0mg/kg AMPH. Removal of the whole adrenal gland or only the medulla abolished neither the startle enhancing effect of AMPH injected acutely nor the sensitization effect of AMPH injected chronically. In addition, intracerebroventricular infusion of a CRF antagonist, a-helical CRF941, prior to the challenge test failed to alter the sensitization effect of AMPH. These findings suggest that neither adrenal hormones nor CRF was indispensable for induction/expression of AMPH-induced sensitization in acoustic startle.

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