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Differential functional connectivity within an emotion regulation neural network among individuals resilient and susceptible to the depressogenic effects of early life stress

Published online by Cambridge University Press:  10 July 2012

J. M. Cisler*
Affiliation:
Brain Imaging Research Center, Psychiatric Research Institute, University of Arkansas for Medical Sciences, Little Rock, AR, USA
G. A. James
Affiliation:
Brain Imaging Research Center, Psychiatric Research Institute, University of Arkansas for Medical Sciences, Little Rock, AR, USA
S. Tripathi
Affiliation:
Brain Imaging Research Center, Psychiatric Research Institute, University of Arkansas for Medical Sciences, Little Rock, AR, USA
T. Mletzko
Affiliation:
Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, GA, USA
C. Heim
Affiliation:
Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, GA, USA
X. P. Hu
Affiliation:
Biomedical Imaging Technology Center, Emory University, Atlanta, GA, USA
H. S. Mayberg
Affiliation:
Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, GA, USA
C. B. Nemeroff
Affiliation:
Department of Psychiatry and Behavioral Sciences, University of Miami Miller School of Medicine, Miami, FA, USA
C. D. Kilts
Affiliation:
Brain Imaging Research Center, Psychiatric Research Institute, University of Arkansas for Medical Sciences, Little Rock, AR, USA
*
*Address for correspondence: J. M. Cisler, Ph.D., Brain Imaging Research Center, Psychiatric Research Institute, University of Arkansas for Medical Sciences, 4301 West Markham St, Mail Slot 554, Little Rock, AR 72205, USA. (Email: [email protected])

Abstract

Background

Early life stress (ELS) is a significant risk factor for depression. The effects of ELS exposure on neural network organization have not been differentiated from the effect of depression. Furthermore, many individuals exposed to ELS do not develop depression, yet the network organization patterns differentiating resiliency versus susceptibility to the depressogenic effects of ELS are not clear.

Method

Women aged 18–44 years with either a history of ELS and no history of depression (n = 7), a history of ELS and current or past depression (n = 19), or a history of neither ELS nor depression (n = 12) underwent a resting-state 3-T functional magnetic resonance imaging (fMRI) scan. An emotion regulation brain network consisting of 21 nodes was described using graph analyses and compared between groups.

Results

Group differences in network topology involved decreased global connectivity and hub-like properties for the right ventrolateral prefrontal cortex (vlPFC) and decreased local network connectivity for the dorsal anterior cingulate cortex (dACC) among resilient individuals. Decreased local connectivity and increased hub-like properties of the left amygdala, decreased hub-like properties of the dACC and decreased local connectivity of the left vlPFC were observed among susceptible individuals. Regression analyses suggested that the severity of ELS (measured by self-report) correlated negatively with global connectivity and hub-like qualities for the left dorsolateral PFC (dlPFC).

Conclusions

These preliminary results suggest functional neural connectivity patterns specific to ELS exposure and resiliency versus susceptibility to the depressogenic effects of ELS exposure.

Type
Original Articles
Copyright
Copyright © Cambridge University Press 2012

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