Regional homogeneity changes in heroin-dependent individuals: resting-state functional MR imaging study

Area of Science:

• Neuroscience
• Radiology
• Psychiatry

Background:

• Opioid use disorder, specifically heroin dependence, is a significant public health issue.
• Cognitive deficits, including impaired decision-making, are common in individuals with heroin dependence.
• Understanding the neural underpinnings of these deficits is crucial for developing effective treatments.

Purpose of the Study:

• To identify alterations in resting-state neural activity in individuals with heroin dependence (HDIs) using resting-state functional magnetic resonance (MR) imaging.
• To investigate the relationship between these neural activity changes, duration of heroin use, and decision-making impairments.

Main Methods:

• Prospective study involving 31 HDIs on methadone treatment and 24 control subjects.
• Resting-state functional MR imaging was employed to assess neural activity.
• Regional homogeneity analysis and voxel-based comparisons were conducted, alongside the Iowa Gambling Task (IGT) for decision-making assessment.

Main Results:

• HDIs exhibited reduced regional homogeneity in the medial orbitofrontal cortex (OFC), dorsal medial thalamus, cuneus, and lingual gyrus compared to controls.
• Diminished regional homogeneity in the medial OFC, cuneus, and lingual gyrus correlated negatively with the duration of heroin use.
• Increased regional homogeneity in the medial OFC showed a positive correlation with better performance on the IGT.

Conclusions:

• Resting-state functional MR imaging reveals significant neural abnormalities in HDIs.
• These findings suggest that altered resting-state neural activity in specific brain regions is associated with cognitive impairments and duration of use in heroin dependence.
• This research contributes to understanding the neural substrates of cognitive dysfunction in HDIs.