Depressive disorders are a major public health problem, both in terms of personal suffering and socioeconomic burden. Epidemiological studies have emphasized the roles of genetic vulnerability and environmental factors in the emergence of depression. Unfortunately, the causes and pathophysiology of major depressive disorder remain largely unknown. Moreover, progress in understanding the neurobiology of depression is hindered by the lack of objective measures of core depressive symptoms. The goals of the proposed work are: (1) to investigate the neurobiological underpinnings of stress-induced anhedonia - an emerging endophenotype of depression - and the moderating effects of candidate genes previously linked to increased vulnerability to depression and stress sensitivity on these mechanisms;(2) to test the hypothesis that decreased phasic dopaminergic transmission within mesolimbic regions plays a key role in the pathophysiology of major depression, which will be achieved by using functional magnetic resonance imaging (fMRI) in conjunction with a pharmacological challenge;and (3) to investigate dopamine transporter (DAT) function and its relation to reward deficits in MDD using positron emission tomography (PET) and fMRI techniques. By combining molecular genetics, functional neuroimaging, pharmacological challenges, endocrinological assessments, and molecular imaging techniques, the proposed study is expected to provide novel insights into the pathophysiology of depression, and thus might offer new targets for treatment strategies and disorder prevention.

Public Health Relevance

The current project proposes a combination of behavioral probes, molecular genetics, and functional and molecular neuroimaging techniques to investigate the role of dopaminergic dysfunction in major depression and in the cardinal symptom anhedonia - the loss of pleasure. This interdisciplinary approach is expected to provide novel insights into putative pathways associated with increased vulnerability to depression and anhedonia, and might provide novel targets for treatment strategies and prevention measures.

National Institute of Health (NIH)
National Institute of Mental Health (NIMH)
Research Project (R01)
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Neural Basis of Psychopathology, Addictions and Sleep Disorders Study Section (NPAS)
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Rumsey, Judith M
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Mclean Hospital
United States
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Treadway, Michael T; Waskom, Michael L; Dillon, Daniel G et al. (2015) Illness progression, recent stress, and morphometry of hippocampal subfields and medial prefrontal cortex in major depression. Biol Psychiatry 77:285-94
Admon, R; Nickerson, L D; Dillon, D G et al. (2015) Dissociable cortico-striatal connectivity abnormalities in major depression in response to monetary gains and penalties. Psychol Med 45:121-31
Admon, Roee; Holsen, Laura M; Aizley, Harlyn et al. (2015) Striatal Hypersensitivity During Stress in Remitted Individuals with Recurrent Depression. Biol Psychiatry 78:67-76
Pizzagalli, Diego A (2014) Depression, stress, and anhedonia: toward a synthesis and integrated model. Annu Rev Clin Psychol 10:393-423
Dillon, Daniel G; Rosso, Isabelle M; Pechtel, Pia et al. (2014) Peril and pleasure: an rdoc-inspired examination of threat responses and reward processing in anxiety and depression. Depress Anxiety 31:233-49
Dillon, Daniel G; Dobbins, Ian G; Pizzagalli, Diego A (2014) Weak reward source memory in depression reflects blunted activation of VTA/SN and parahippocampus. Soc Cogn Affect Neurosci 9:1576-83
Kumar, P; Berghorst, L H; Nickerson, L D et al. (2014) Differential effects of acute stress on anticipatory and consummatory phases of reward processing. Neuroscience 266:1-12
Vrieze, Elske; Demyttenaere, Koen; Bruffaerts, Ronny et al. (2014) Dimensions in major depressive disorder and their relevance for treatment outcome. J Affect Disord 155:35-41
Auerbach, Randy P; Admon, Roee; Pizzagalli, Diego A (2014) Adolescent depression: stress and reward dysfunction. Harv Rev Psychiatry 22:139-48
Pechtel, Pia; Dutra, Sunny J; Goetz, Elena L et al. (2013) Blunted reward responsiveness in remitted depression. J Psychiatr Res 47:1864-9

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