Abnormal interhemispheric resting state functional connectivity of the insula in heroin users under methadone maintenance treatment. (30th September 2016)

• Record Type: Journal Article
• Authors: Wang, Peng-Wei; Lin, Huang-Chi; Liu, Gin-Chung; Yang, Yi-Hsin Connie; Ko, Chih-Hung; Yen, Cheng-Fang
• Is Part Of: Psychiatry research. Volume 255(2016)
• Page Start: 9
• Page End: 14
• Publication Date: 2016-09-30
• Subjects: Functional connectivity -- Heroin -- Insula; Psychiatry -- Periodicals; Brain -- Imaging -- Periodicals; Psychiatry -- Periodicals; Diagnostic Imaging -- Periodicals; Psychiatrie -- Périodiques; Cerveau -- Imagerie pour le diagnostic -- Périodiques; 616.890754
• DOI: 10.1016/j.pscychresns.2016.07.009
• Languages: English
• ISSNs: 0925-4927

Abstract

Abstract: Abnormal interhemispheric functional connectivity is attracting more and more attention in the field of substance use. This study aimed to examine 1) the differences in interhemispheric functional connections of the insula with the contralateral insula and other brain regions between heroin users under methadone maintenance treatment (MMT) and healthy controls, and 2) the association between heroin users' interhemispheric insular functional connectivity using resting functional magnetic resonance imaging (fMRI) and the results of urine heroin analysis. Sixty male right-handed persons, including 30 with heroin dependence under MMT and 30 healthy controls, were recruited to this study. Resting fMRI experiments and urine heroin analysis were performed. Compared with the controls, the heroin users had a significantly lower interhemispheric insular functional connectivity. They also exhibited lower functional connectivity between insula and contralateral inferior orbital frontal lobe. After controlling for age, educational level and methadone dosage, less deviation of the interhemispheric insula functional connectivity was significantly associated with a lower risk of a positive urine heroin analysis result. Our findings demonstrated that the heroin users under MMT had abnormal long-range and interhemispheric resting functional connections. Those with a less dysfunctional interhemispheric insula functional connectivity had a lower risk of a positive urine heroin test. Highlights: Heroin users with MMT showed decreased interhemispheric insular functional connectivity. Decreased connection between insula and contralateral inferior orbital frontal lobe developed. Increased interhemispheric insular connection linked with a lower positive urine analysis.