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Aberrant default-mode functional and structural connectivity in heroin-dependent individuals.
- Source :
-
PloS one [PLoS One] 2015 Apr 10; Vol. 10 (4), pp. e0120861. Date of Electronic Publication: 2015 Apr 10 (Print Publication: 2015). - Publication Year :
- 2015
-
Abstract
- Background: Little is known about connectivity within the default mode network (DMN) in heroin-dependent individuals (HDIs). In the current study, diffusion-tensor imaging (DTI) and resting-state functional MRI (rs-fMRI) were combined to investigate both structural and functional connectivity within the DMN in HDIs.<br />Methods: Fourteen HDIs and 14 controls participated in the study. Structural (path length, tracts count, (fractional anisotropy) FA and (mean diffusivity) MD derived from DTI tractography)and functional (temporal correlation coefficient derived from rs-fMRI) DMN connectivity changes were examined in HDIs. Pearson correlation analysis was performed to compare the structural/functional indices and duration of heroin use/Iowa gambling task(IGT) performance in HDIs.<br />Results: HDIs had lower FA and higher MD in the tract connecting the posterior cingulate cortex/precuneus (PCC/PCUN) to right parahippocampal gyrus (PHG), compared to the controls. HDIs also had decreased FA and track count in the tract connecting the PCC/PCUN and medial prefrontal cortex (MPFC), as well as decreased functional connectivity between the PCC/PCUN and bilateral PHG and MPFC, compared to controls. FA values for the tract connecting PCC/PCUN to the right PHG and connecting PCC/PCUN to the MPFC were negatively correlated to the duration of heroin use. The temporal correlation coefficients between the PCC/PCUN and the MPFC, and the FA values for the tract connecting the PCC/PCUN to the MPFC were positively correlated to IGT performance in HDIs.<br />Conclusions: Structural and functional connectivity within the DMN are both disturbed in HDIs. This disturbance progresses as duration of heroin use increases and is related to deficits in decision making in HDIs.
- Subjects :
- Adult
Brain diagnostic imaging
Brain pathology
Brain physiology
Brain Mapping
Case-Control Studies
Diffusion Tensor Imaging
Gyrus Cinguli diagnostic imaging
Gyrus Cinguli pathology
Gyrus Cinguli physiology
Heroin urine
Heroin Dependence diagnostic imaging
Humans
Image Processing, Computer-Assisted
Magnetic Resonance Imaging
Male
Middle Aged
Parahippocampal Gyrus diagnostic imaging
Parahippocampal Gyrus pathology
Parahippocampal Gyrus physiology
Radiography
Heroin adverse effects
Heroin Dependence pathology
Subjects
Details
- Language :
- English
- ISSN :
- 1932-6203
- Volume :
- 10
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- PloS one
- Publication Type :
- Academic Journal
- Accession number :
- 25859661
- Full Text :
- https://doi.org/10.1371/journal.pone.0120861