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Neurosci Lett. 2016 Jan 26;612:126-131. doi: 10.1016/j.neulet.2015.11.024. Epub 2015 Nov 27.

Activation of AMPA receptor in the infralimbic cortex facilitates extinction and attenuates the heroin-seeking behavior in rats.

Author information

1
Laboratory of Behavioral Neuroscience, Ningbo Institute of Microcirculation and Henbane, Ningbo Addiction Research and Treatment Center, School of Medicine, Ningbo University, Ningbo 315010, Zhejiang Province, PR China.
2
Yinzhou Tongji High School, Ningbo 315175, Zhejiang Province, PR China.
3
The Children's Hospital Zhejiang University School of Medicine, Hangzhou 310003, Zhejiang Province, PR China.
4
Hwa Chong Institution, 661 Bukit Timah Road, Singapore 269734, Singapore.
5
Laboratory of Behavioral Neuroscience, Ningbo Institute of Microcirculation and Henbane, Ningbo Addiction Research and Treatment Center, School of Medicine, Ningbo University, Ningbo 315010, Zhejiang Province, PR China. Electronic address: whzhou@vip.163.com.
6
Laboratory of Behavioral Neuroscience, Ningbo Institute of Microcirculation and Henbane, Ningbo Addiction Research and Treatment Center, School of Medicine, Ningbo University, Ningbo 315010, Zhejiang Province, PR China. Electronic address: lihufen@163.com.

Abstract

Infralimbic cortex (IL) is proposed to suppress cocaine seeking after extinction, but whether the IL regulates the extinction and reinstatement of heroin-seeking behavior is unknown. To address this issue, the male SD rats were trained to self-administer heroin under a FR1 schedule for consecutive 14 days, then the rats underwent 7 daily 2h extinction session in the operant chamber. The activation of IL by microinjection PEPA, an allosteric AMPA receptor potentiator into IL before each of extinction session facilitated the extinction responding after heroin self-administration, but did not alter the locomotor activity in an open field testing environment. Other rats were first trained under a FR1 schedule for heroin self-administration for 14 days, followed by 14 days of extinction training, and reinstatement of heroin-seeking induced by cues was measured for 2h. Intra-IL microinjecting of PEPA at 15min prior to test inhibited the reinstatement of heroin-seeking induced by cues. Moreover, the expression of GluR1 in the IL and NAc remarkably increased after treatment with PEPA during the reinstatement. These finding suggested that activation of glutamatergic projection from IL to NAc shell may be involved in the extinction and reinstatement of heroin-seeking.

KEYWORDS:

AMPA receptor; Extinction; Frontal cortex; Heroin; Inhibitory memory

PMID:
26639425
DOI:
10.1016/j.neulet.2015.11.024
[Indexed for MEDLINE]

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