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Compulsive methamphetamine taking in the presence of punishment is associated with increased oxytocin expression in the nucleus accumbens of rats.
- Source :
-
Scientific reports [Sci Rep] 2017 Aug 21; Vol. 7 (1), pp. 8331. Date of Electronic Publication: 2017 Aug 21. - Publication Year :
- 2017
-
Abstract
- Methamphetamine addiction is mimicked in rats that self-administer the drug. However, these self-administration (SA) models do not include adverse consequences that are necessary to reach a diagnosis of addiction in humans. Herein, we measured genome-wide transcriptional consequences of methamphetamine SA and footshocks in the rat brain. We trained rats to self-administer methamphetamine for 20 days. Thereafter, lever-presses for methamphetamine were punished by mild footshocks for 5 days. Response-contingent punishment significantly reduced methamphetamine taking in some rats (shock-sensitive, SS) but not in others (shock-resistant, SR). Rats also underwent extinction test at one day and 30 days after the last shock session. Rats were euthanized one day after the second extinction test and the nucleus accumbens (NAc) and dorsal striatum were collected to measure gene expression with microarray analysis. In the NAc, there were changes in the expression of 13 genes in the SRvsControl and 9 genes in the SRvsSS comparison. In the striatum, there were 9 (6 up, 3 down) affected genes in the SRvsSS comparison. Among the upregulated genes was oxytocin in the NAc and CARTpt in the striatum of SR rats. These observations support a regional role of neuropeptides in the brain after a long withdrawal interval when animals show incubation of methamphetamine craving.
- Subjects :
- Amphetamine-Related Disorders
Animals
Central Nervous System Stimulants administration & dosage
Corpus Striatum drug effects
Corpus Striatum metabolism
Electroshock
Male
Nucleus Accumbens metabolism
Oligonucleotide Array Sequence Analysis methods
Rats, Sprague-Dawley
Self Administration
Methamphetamine administration & dosage
Nucleus Accumbens drug effects
Oxytocin genetics
Punishment
Transcriptome drug effects
Subjects
Details
- Language :
- English
- ISSN :
- 2045-2322
- Volume :
- 7
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Scientific reports
- Publication Type :
- Academic Journal
- Accession number :
- 28827541
- Full Text :
- https://doi.org/10.1038/s41598-017-08898-8