Abstinence from Escalation of Cocaine Intake Changes the microRNA Landscape in the Cortico-Accumbal Pathway

• Published in: Biomedicines Vol. 11; no. 5; p. 1368
• Main Authors: Kumaresan, Vidhya, Lim, Yolpanhchana, Juneja, Poorva, Tipton, Allison E., de Guglielmo, Giordano, Carrette, Lieselot L. G., Kallupi, Marsida, Maturin, Lisa, Liu, Ying, George, Olivier, Zhang, Huiping
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 05.05.2023; MDPI
• Subjects: Abstinence; Addictions; Addictive behaviors; Amphetamines; Animal cognition; Behavior; Biobanks; Biomarkers; Brain; Cocaine; DNA methylation; Drug overdose; Drug self-administration; Drug use; Drug withdrawal; Epigenetics; Gap junctions; Gene expression; Genetic diversity; Glutamatergic transmission; Human subjects; Laboratory animals; MAP kinase; MicroRNA; MicroRNAs; miRNA; Morphine; Nucleus accumbens; outbred heterogeneous stock rats; Post-transcription; Prefrontal cortex; protracted abstinence; rat brain miRNA; RNA sequencing; Signal transduction; small RNA sequencing; Transcriptomics; Withdrawal; United States > US; California; addiction index; rat brain miRNA; prefrontal cortex; outbred heterogeneous stock rats; nucleus accumbens; small RNA sequencing; protracted abstinence
• DOI: 10.3390/biomedicines11051368
• ISSN: 2227-9059

Cocaine administration alters the microRNA (miRNA) landscape in the cortico-accumbal pathway. These changes in miRNA can play a major role in the posttranscriptional regulation of gene expression during withdrawal. This study aimed to investigate the changes in microRNA expression in the cortico-accumbal pathway during acute withdrawal and protracted abstinence following escalated cocaine intake. Small RNA sequencing (sRNA-seq) was used to profile miRNA transcriptomic changes in the cortico-accumbal pathway [infralimbic- and prelimbic-prefrontal cortex (IL and PL) and nucleus accumbens (NAc)] of rats with extended access to cocaine self-administration followed by an 18-h withdrawal or a 4-week abstinence. An 18-h withdrawal led to differential expression (fold-change > 1.5 and p < 0.05) of 21 miRNAs in the IL, 18 miRNAs in the PL, and two miRNAs in the NAc. The mRNAs potentially targeted by these miRNAs were enriched in the following pathways: gap junctions, neurotrophin signaling, MAPK signaling, and cocaine addiction. Moreover, a 4-week abstinence led to differential expression (fold-change > 1.5 and p < 0.05) of 23 miRNAs in the IL, seven in the PL, and five miRNAs in the NAc. The mRNAs potentially targeted by these miRNAs were enriched in pathways including gap junctions, cocaine addiction, MAPK signaling, glutamatergic synapse, morphine addiction, and amphetamine addiction. Additionally, the expression levels of several miRNAs differentially expressed in either the IL or the NAc were significantly correlated with addiction behaviors. Our findings highlight the impact of acute and protracted abstinence from escalated cocaine intake on miRNA expression in the cortico-accumbal pathway, a key circuit in addiction, and suggest developing novel biomarkers and therapeutic approaches to prevent relapse by targeting abstinence-associated miRNAs and their regulated mRNAs.