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- W1991036207 abstract "We have previously observed that chronic cocaine administration increases levels of adenylyl cyclase and cAMP-dependent protein kinase (PKA) in the nucleus accumbens (NAc). In the present work we directly examined the involvement of the cAMP system at the level of the NAc in cocaine-induced locomotor activity and sensitization. Groups of rats were pretreated on 3 consecutive days with cocaine (10 mg/kg, i.p.) concurrently with intraacumbens infusion saline, 8-bromo-cAMP (2 micrograms/side; a membrane permanent analogue of cAMP which activates PKA), or RP-CPT-cAMP (20 nmol/side; which inhibits PKA). In a separate experiment, control animals received total infusion of either 8-bromo-cAMP or saline plus i.p. saline. All animals were tested for locomotor activity on pretreatment days, and following an additional cocaine challenge ona subsequent day. Over pretreatment days, animals given 8-bromo-cAMP showed greater cocaine-induced activity, while animals given RP-CPT-cAMP tended to be less active, compared to saline infused animals. When subsequently challenged with cocaine, animals pretreated with intraaccumbens 8-bromo-cAMP showed greater locomotor activity during the last 30 min of the 60 min test session than animals pretreated with saline or RP-CRT-cAMP. No differences in locomotor activity were evident between the two control groups on pretreatment or challenge days. These data suggest that PKA activation at the level of the NAc may have a facilitative role with respect to acute and long-term stimulant-induced locomotor activity." @default.
- W1991036207 created "2016-06-24" @default.
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- W1991036207 date "1995-03-01" @default.
- W1991036207 modified "2023-09-23" @default.
- W1991036207 title "Behavioral sensitization to cocaine: modulation by the cyclic AMP system in the nucleus accumbens" @default.
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- W1991036207 doi "https://doi.org/10.1016/0006-8993(95)00030-t" @default.
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