Upregulation of L‐type Cav1 channels in the development of psychological dependence |
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Authors: | Masahiro Shibasaki Kazuhiro Kurokawa Seitaro Ohkuma |
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Affiliation: | Department of Pharmacology, Kawasaki Medical School, Kurashiki 701‐0192, Japan |
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Abstract: | Although L‐type voltage‐dependent Ca2+ channels regulate activity‐dependent processes including synaptic plasticity and synapse formation, there are few data on the changes of Cav1 channel expression in psychological dependence. This study investigated the role of L‐type Cav1 channel expression in the brain of mouse that was psychologically dependent on methamphetamine (2 mg/kg, subcutaneous injection [s.c.]), cocaine (10 mg/kg, s.c.), and morphine (5 mg/kg, s.c.) with the conditioned place preference paradigm. Intracerebroventricular administration of nifedipine (3, 10, and 30 nmol/mouse) dose‐dependently reduced the development of methamphetamine‐, cocaine‐, and morphine‐induced rewarding effect. Under such conditions, protein levels of both Cav1.2 and Cav1.3 in the frontal cortex and the limbic forebrain were significantly increased on methamphetamine‐, cocaine‐, and morphine‐induced psychologically dependent mice. These findings suggest that the upregulation of Cav1.2 and Cav1.3 participated in the development of psychological dependence. Synapse 64:440–444, 2010. © 2010 Wiley‐Liss, Inc. |
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Keywords: | drugs of abuse L‐type voltage‐dependent calcium channels neuronal plasticity |
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