The Investigation of MicroRNA Expression Levels in Postmortem Nucleus Accumbens of the Individuals with
Burcu Çaykara Peran1,2, Hani Alsaadoni3,4, İpek Esen Melez5
1Department of Molecular Medicine, Istanbul University, Aziz Sancar Institute of Experimental Medicine (ASDETAE), Istanbul, Turkey. burcu.caykaraperan@sbu.edu.tr.
Abstract:
MicroRNAs, small noncoding RNA molecules, are pivotal regulators of gene expression and have been increasingly implicated in the molecular mechanisms underlying addiction. In this study, we investigated microRNA expression profiles in postmortem nucleus accumbens tissue, a key brain region for reward and addiction, from individuals with 6-monoacetylmorphine confirmed heroin-associated polysubstance intoxication (6-MAM-HAPI) (n = 20) compared with non-user individuals (n = 20). Total RNA was isolated from the tissues with "RNAzol®RT," and cDNA was obtained and measured by qRT-PCR. MicroRNA expression levels were calculated by the 2-ΔΔCT method. Our study revealed a distinct pattern of dysregulation, with downregulation of miR-132, miR-140, miR-181a, miR-206, miR-212, and miR-339-5p, alongside a significant upregulation of miR-133b in nucleus accumbens of 6-MAM-HAPI. These findings provide preliminary postmortem evidence suggesting possible miRNA expression changes in the nucleus accumbens in the context of 6-MAM-HAPI.
Insights
MicroRNAs regulate gene expression and are linked to addiction. This study found specific microRNA changes in the nucleus accumbens of individuals with heroin-associated polysubstance intoxication, suggesting a role in addiction.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- MicroRNAs (miRNAs) are small noncoding RNA molecules that regulate gene expression.
- Emerging evidence implicates miRNAs in the complex molecular mechanisms of addiction.
- The nucleus accumbens is a critical brain region involved in reward processing and addiction.
Purpose of the Study:
- To investigate microRNA expression profiles in the nucleus accumbens.
- To compare miRNA expression between individuals with heroin-associated polysubstance intoxication and non-users.
- To identify potential miRNA biomarkers associated with heroin use.
Main Methods:
- Postmortem nucleus accumbens tissue samples were analyzed.
- RNA isolation was performed using RNAzol®RT.
- Quantitative reverse transcription polymerase chain reaction (qRT-PCR) was used to measure microRNA expression levels.
- The 2-ΔΔCT method was applied for quantification.
Main Results:
- A distinct pattern of miRNA dysregulation was observed in the nucleus accumbens of individuals with 6-monoacetylmorphine confirmed heroin-associated polysubstance intoxication (6-MAM-HAPI).
- Downregulation of miR-132, miR-140, miR-181a, miR-206, miR-212, and miR-339-5p was detected.
- Significant upregulation of miR-133b was found in the 6-MAM-HAPI group.
Conclusions:
- These findings provide preliminary postmortem evidence of altered miRNA expression in the nucleus accumbens.
- The observed miRNA changes may contribute to the molecular pathology of heroin addiction.
- Further research is warranted to elucidate the functional roles of these miRNAs in addiction.
