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Chronic morphine treatment decreases acoustic startle response and prepulse inhibition in rats

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Abstract

The reward-related effects of addictive drugs primarily act via the dopamine system, which also plays an important role in sensorimotor gating. The mesolimbic dopamine system is the common pathway of drug addiction and sensorimotor gating. However, the way in which addictive drugs affect sensorimotor gating is currently unclear. In previous studies, we examined the effects of morphine treatment on sensory gating in the hippocampus. The present study investigated the effects of morphine on sensorimotor gating in rats during chronic morphine treatment and withdrawal. Rats were examined during treatment with morphine for 10 successive days, followed by a withdrawal period. Acoustic startle responses to a single startle stimulus (115 dB SPL) and prepulse inhibition responses were recorded. The results showed that acoustic startle responses were attenuated during morphine treatment, but not during withdrawal. PPI was impaired in the last 2 morphine treatment days, but returned to a normal level during withdrawal.

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Authors and Affiliations

  1. State Key Laboratory of Brain and Cognitive Science, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, China

    ZhiQiang Meng, DongMing Zhou, JianHong Wang & YuanYe Ma

  2. State Key Laboratory of Brain and Cognitive Science, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China

    DongMing Zhou & YuanYe Ma

  3. Graduate University of Chinese Academy of Sciences, Beijing, 100049, China

    ZhiQiang Meng

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  1. ZhiQiang Meng
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  2. DongMing Zhou
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  3. JianHong Wang
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  4. YuanYe Ma
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Correspondence to YuanYe Ma.

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Meng, Z., Zhou, D., Wang, J. et al. Chronic morphine treatment decreases acoustic startle response and prepulse inhibition in rats. Sci. China Life Sci. 53, 1356–1360 (2010). https://doi.org/10.1007/s11427-010-4077-2

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  • DOI: https://doi.org/10.1007/s11427-010-4077-2

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