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MicroRNA expression signature of methamphetamine use and addiction in the rat nucleus accumbens

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Abstract

Methamphetamine (METH) is a highly addictive psycho-stimulant that induces behavioral changes due to high level of METH-induced dopamine in the brain. Nucleus accumbens (NAc) plays an important role in these changes, especially in drug addiction. However, little is known about the underlying molecular mechanisms of METH-induced addiction. The objective of this study was to establish a behavioral model of METH use and addiction using escalating doses of METH over 15 days and to determine the global miRNA expression profiling in NAc of METH-addicted rats. In the behavioral study, the experimental rats were divided into 3 groups of 9 each: a control group, a single dose METH (5 mg/kg) treatment group and a continuous 15 alternate days METH (0.25, 0.5, 1, 2, 3, 4, 5 mg/kg) treatment group. Following that, six rats in each group were randomly selected for global miRNA profiling. Addiction behavior in rats was established using Conditioned Place Preference task. The analysis of the miRNA profiling in the NAc was performed using Affymetric microarray GeneChip® System. The findings indicated that a continuous 15 alternate days METH treatment rats showed a preference for the drug-paired compartment of the CPP. However, a one-time acute treatment with 5 mg/kg METH did not show any significant difference in preference when compared with controls. Differential profiling of miRNAs indicated that 166 miRNAs were up-regulated and 4 down-regulated in the chronic METH-treatment group when compared to controls. In comparing the chronic treatment group with the acute treatment group, 52 miRNAs were shown to be up-regulated and 7 were down-regulated. MiRNAs including miR-496-3p, miR-194-5p, miR-200b-3p and miR-181a-5p, were found to be significantly associated with METH addiction. Canonical pathway analysis revealed that a high number of METH addiction-related miRNAs play important roles in the MAPK, CREB, G-Protein Couple Receptor and GnRH Signaling pathways. Our results suggest that dynamic changes occur in the expression of miRNAs following METH exposure and addiction.

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Abbreviations

miRNA:

microRNA

SEM:

standard error of the mean

qPCR:

real-time polymerase chain reaction

RIN:

RNA Integrity Number

MAPK:

mitogen-activated protein kinases

CREB:

cAMP response element-binding protein

GnRH:

Gonadotropin-releasing hormone

BDNF:

brain-derived neurotrophic factor

PKA:

protein kinase A

PKC:

protein kinase C

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Correspondence to Maw Shin Sim or Zahurin Mohamed.

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All procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted.

Financial disclosure

This work was supported by Research University Grant RG443/12HTM from the University of Malaya and High Impact Research (HIR) Ministry of Higher Education (MOHE) Grant H20001-E000025. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Statement of interest

All the authors declare that they have no conflicts of interest to report that could inappropriately influence, or be perceived to influence, this work. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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Sim, M.S., Soga, T., Pandy, V. et al. MicroRNA expression signature of methamphetamine use and addiction in the rat nucleus accumbens. Metab Brain Dis 32, 1767–1783 (2017). https://doi.org/10.1007/s11011-017-0061-x

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  • DOI: https://doi.org/10.1007/s11011-017-0061-x

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