» Articles » PMID: 23785337

The Effects of Maternal Separation on Adult Methamphetamine Self-Administration, Extinction, Reinstatement, and MeCP2 Immunoreactivity in the Nucleus Accumbens

Overview
Specialty Psychiatry
Date 2013 Jun 21
PMID 23785337
Citations 41
Authors
Affiliations
Soon will be listed here.
Abstract

The maternal separation (MS) paradigm is an animal model of early life stress. Animals subjected to MS during the first 2 weeks of life display altered behavioral and neuroendocrinological stress responses as adults. MS also produces altered responsiveness to and self-administration (SA) of various drugs of abuse including cocaine, ethanol, and amphetamine. However, no studies have yet examined the effects of MS on methamphetamine (METH) SA. This study was performed to examine the effects of MS on the acquisition of METH SA, extinction, and reinstatement of METH-seeking behavior in adulthood. Given the known influence of early life stress and drug exposure on epigenetic processes, we also investigated group differences in levels of the epigenetic marker methyl CpG binding protein 2 (MeCP2) in the nucleus accumbens (NAc) core. Long-Evans pups and dams were separated on postnatal days (PND) 2-14 for either 180 (MS180) or 15 min (MS15). Male offspring were allowed to acquire METH SA (0.05 mg/kg/infusion) in 15 2-h daily sessions starting at PND67, followed by extinction training and cue-induced reinstatement of METH-seeking behavior. Rats were then assessed for MeCP2 levels in the NAc core by immunohistochemistry. The MS180 group self-administered significantly more METH and acquired SA earlier than the MS15 group. No group differences in extinction or cue-induced reinstatement were observed. MS15 rats had significantly elevated MeCP2-immunoreactive cells in the NAc core as compared to MS180 rats. Together, these data suggest that MS has lasting influences on METH SA as well as epigenetic processes in the brain reward circuitry.

Citing Articles

Early social isolation differentially affects the glucocorticoid receptor system and alcohol-seeking behavior in male and female Marchigian Sardinian alcohol-preferring rats.

Benvenuti F, De Carlo S, Rullo L, Caffino L, Losapio L, Morosini C Neurobiol Stress. 2023; 28:100598.

PMID: 38115888 PMC: 10727952. DOI: 10.1016/j.ynstr.2023.100598.


Sex differences in addiction-relevant behavioral outcomes in rodents following early life stress.

Rincon-Cortes M Addict Neurosci. 2023; 6.

PMID: 37101684 PMC: 10124992. DOI: 10.1016/j.addicn.2023.100067.


Early-life adversity increases anxiety-like behavior and modifies synaptic protein expression in a region-specific manner.

Hamdan J, Sierra-Fonseca J, Flores R, Saucedo Jr S, Miranda-Arango M, ODell L Front Behav Neurosci. 2022; 16:1008556.

PMID: 36338879 PMC: 9626971. DOI: 10.3389/fnbeh.2022.1008556.


Effects of prenatal opioid exposure on synaptic adaptations and behaviors across development.

Simmons S, Grecco G, Atwood B, Nugent F Neuropharmacology. 2022; 222:109312.

PMID: 36334764 PMC: 10314127. DOI: 10.1016/j.neuropharm.2022.109312.


Oxytocin as an adolescent treatment for methamphetamine addiction after early life stress in male and female rats.

Baracz S, Robinson K, Wright A, Turner A, McGregor I, Cornish J Neuropsychopharmacology. 2022; 47(8):1561-1573.

PMID: 35581382 PMC: 9206013. DOI: 10.1038/s41386-022-01336-y.


References
1.
Francis D, Champagne F, Liu D, Meaney M . Maternal care, gene expression, and the development of individual differences in stress reactivity. Ann N Y Acad Sci. 2000; 896:66-84. DOI: 10.1111/j.1749-6632.1999.tb08106.x. View

2.
Roth T . Epigenetics of neurobiology and behavior during development and adulthood. Dev Psychobiol. 2012; 54(6):590-7. DOI: 10.1002/dev.20550. View

3.
Murgatroyd C, Patchev A, Wu Y, Micale V, Bockmuhl Y, Fischer D . Dynamic DNA methylation programs persistent adverse effects of early-life stress. Nat Neurosci. 2009; 12(12):1559-66. DOI: 10.1038/nn.2436. View

4.
Skene P, Illingworth R, Webb S, Kerr A, James K, Turner D . Neuronal MeCP2 is expressed at near histone-octamer levels and globally alters the chromatin state. Mol Cell. 2010; 37(4):457-68. PMC: 4338610. DOI: 10.1016/j.molcel.2010.01.030. View

5.
Bolanos C, Nestler E . Neurotrophic mechanisms in drug addiction. Neuromolecular Med. 2004; 5(1):69-83. DOI: 10.1385/NMM:5:1:069. View