Use of Resting-state Functional Magnetic Resonance Imaging to Measure Functional Connectivity in Adolescents with Depression

European Psychiatric Review, 2011;4(2):94-96

Abstract

Major depressive disorder (MDD) is a serious mental disorder associated with severe outcomes, including disability and suicide. Abnormalities in the neural development during adolescence may be centrally linked with the risk of developing MDD. A growing body of neuroimaging research, in adults and adolescents, supports a model for the pathophysiology of MDD rooted in the fronto-limbic neural circuitry. One promising technique well-suited for examination of this circuitry is resting-state functional magnetic resonance imaging (fMRI). Resting-state fMRI has now been used to investigate functional connectivity in normative populations and in neuropsychiatric disorders. We review research in adults with depression that has led us to consider using this methodology to examine the neural circuitry of depression in adolescents. We also review results from our own study examining MDD in adolescents, which demonstrated lower resting-state functional connectivity in the network arising from the subgenual anterior cingulate cortex (ACC) compared with controls. Resting-state neuroimaging holds considerable promise for advancing our conceptualisation of the underlying neurobiology of depression, with the hope of aiding the development of more effective treatments.
Keywords
Depression, resting-state, functional magnetic resonance imaging (fMRI), adolescence
Disclosure The authors have no conflicts of interest to declare.
Received: October 26, 2011 Accepted November 16, 2011
Correspondence: Kathryn R Cullen, Department of Psychiatry, F256/2B West, 2450 Riverside Avenue, Minneapolis, MN 55454, US. E: rega0026@umn.edu

Major depressive disorder (MDD) is a serious mental illness that leads to severe outcomes, including disability1 and suicide.2 MDD occurs frequently in adolescence, with prevalence rates of 15 %.3 Clinically, adolescent depression is continuous with adult depression.4–7 Neurobiological models for the pathophysiology of depression have been developed largely based on research in adults, but questions remain about how this knowledge applies to adolescence. For instance, does the disruption of biological mechanisms:

  • occur prior to the onset of depression (as reflected in a vulnerability that makes individuals less apt to effectively manage stress);
  • develop early on in the disease process (such as a first episode in adolescence); or
  • result from chronic disease?

Further, adolescence is a time associated with significant brain maturation and refinement of neuronal connections, raising the possibility that the neural underpinnings of depression in young people could differ from that in adults. For instance, adolescent brain development changes include linear white matter increase,8–10 non-linear grey matter decrease8,11,12 and maturation of brain networks from diffuse to focal patterns of connectivity.13–15 Ongoing neural development may render an increased neural plasticity inherent to this time period, which could in turn provide an opportune time to apply early interventions.

The application of an array of techniques under the spectrum of magnetic resonance imaging (MRI) technology has facilitated significant advances in our current understanding of the pathophysiology of MDD. MRI research allows the safe examination of the structure and function of neural systems in vivo. A growing body of neuroimaging research, largely from adults, supports a model for the pathophysiology of MDD rooted in fronto-limbic neural circuitry,16,17 a set of brain connections that mediates emotional processing.18 Structural and functional neuroimaging studies in children and adolescents with depression have also revealed abnormalities in the structure as well as the function of key nodes within this circuitry, including the prefrontal cortex,19,20 the anterior cingulate cortex (ACC),21–23 the amygdala24–27 and the hippocampus.28 Increasing attention has recently been given to the subgenual region of the ACC, an area that appears to have central significance in adult MDD29,30 and in adolescent MDD.21,31 Indeed, this region may represent a ‘hub’ for the fronto-limbic circuits that are dysregulated in MDD.30,32 For instance, this region has been specifically targeted in surgical treatments for refractory depression (i.e., deep brain stimulation).29

Advantages of Resting-state Functional Magnetic Resonance Imaging
Recent advances in neuroimaging have permitted moving beyond just identifying brain structures to investigating the nature of connections within circuits. One neuroimaging technique well-suited for this is resting-state functional MRI (fMRI). This method measures the spontaneous slow-wave (0.01–0.1 Hz) fluctuations in blood oxygen level-dependent (BOLD) signal that are observed while subjects are at rest.33 Temporal resting-state patterns are highly correlated within brain regions that are known to be anatomically connected.34 Thus ‘functional connectivity’ is a measurement of the interregional correlations of these BOLD patterns.35 Increasing evidence supports that this approach can provide new knowledge about the make-up of neural networks, and the practical advantages of this imaging approach are numerous. Specifically, this technique provides a safe and non-invasive way to collect important data about neural connections in a relatively short period of time – our laboratory uses a six-minute resting-state MRI scan length – without requiring the design of an additional cognitive task.

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