The enhancement of FosB-positive neurons in the NAc or DG could be inhibited by microinjection of M5 muscarinic receptor AS-ONs into the VTA before the heroin-induced locomotor sensitization was performed.

• 海洛因诱导的行为敏化大鼠中NAc及DG中的FosB免疫反应阳性神经元的表达增加,而在VTA内注射M5AS-ONs能明显抑制NAc及DG中FosB阳性神经元表达的增加;