This study will characterize the neurochemical abnormalities in important brain circuits underlying obsessive-compulsive disorder (OCD) symptoms and the effects of cognitive-behavioral therapy (CBT). Identification of such metabolite biomarkers will provide an important foundation for translational clinical studies to maximize the ability of CBT to reduce symptoms and to design medications that target core features of the disease, which is particularly important for those who do not respond to, or have access to, CBT. This is relevant to the NIMH strategic plans to promote discovery in the brain of the causes of mental disorders and will help lay the foundation for the development of new and better interventions that incorporate the diverse needs and circumstances of people with mental illnesses. OCD is an often disabling and chronic psychiatric condition that affects approximately 2% of the world's population. Most patients respond only incompletely to current treatments and many do not respond at all. CBT, a form of psychotherapy, is one of the most effective treatments for OCD, yet its mechanism of action is not fully understood. The objective of this proposed study is to use neuroimaging to understand how neurometabolite abnormalities in neural circuits relate to OCD symptoms, and how these are affected by CBT. In OCD, dysfunction is suspected in several subregions of the cingulate gyrus, a brain region involved in relevant neural circuits. This proposal will use magnetic resonance spectroscopic imaging (MRSI) to measure concentrations of brain metabolites, including glutamate (Glu), in the cingulate. Glu is an important excitatory neurotransmitter that is suspected to be disturbed in OCD. In this proposal, MRSI scans will be performed on 25 adult OCD patients before and after 4 weeks of daily CBT. They will be compared to 25 untreated healthy controls scanned 4 weeks apart. A third group of 25 OCD patients will be scanned before and after 4 weeks while on the waitlist, will then receive 4 weeks of CBT, and will be scanned a third time at its completion.
The specific aims of this proposal are: 1) Determine if levels of the Glu in the """"""""emotional"""""""" and """"""""cognitive"""""""" subregions of the cingulate differ between OCD patients and controls;2) Determine if Glu changes after CBT or waitlist in the OCD patients and if they change in the controls after simple passage of time;3) Determine if there are relationships between Glu and clinical and neurocognitive symptoms of OCD before and after CBT.

Public Health Relevance

Even with the best available treatments for obsessive-compulsive disorder (OCD), most patients only partially recover and many patients do not respond at all. Such incomplete and inadequate response contributes to greater public health costs in terms of morbidity and patient care expenses. This proposal aims for a better understanding of abnormal brain chemistry in OCD and how it is affected by cognitive-behavioral therapy (CBT) in order to develop novel therapies and improve the success of existing therapies.

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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Hillefors, MI
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University of California Los Angeles
Schools of Medicine
Los Angeles
United States
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Reggente, Nicco; Moody, Teena D; Morfini, Francesca et al. (2018) Multivariate resting-state functional connectivity predicts response to cognitive behavioral therapy in obsessive-compulsive disorder. Proc Natl Acad Sci U S A 115:2222-2227
Tadayonnejad, Reza; Deshpande, Rangaprakash; Ajilore, Olusola et al. (2018) Pregenual Anterior Cingulate Dysfunction Associated with Depression in OCD: An Integrated Multimodal fMRI/1H MRS Study. Neuropsychopharmacology 43:1146-1155
Motivala, Sarosh J; Arellano, Maria; Greco, Rebecca L et al. (2018) Relationships between obsessive-compulsive disorder, depression and functioning before and after exposure and response prevention therapy. Int J Psychiatry Clin Pract 22:40-46
Moody, Teena D; Shen, Vivian W; Hutcheson, Nathan L et al. (2017) Appearance evaluation of others' faces and bodies in anorexia nervosa and body dysmorphic disorder. Int J Eat Disord 50:127-138
Feusner, Jamie D; Lidström, Andreas; Moody, Teena D et al. (2017) Intrinsic network connectivity and own body perception in gender dysphoria. Brain Imaging Behav 11:964-976
O'Neill, Joseph; Piacentini, John; Chang, Susanna et al. (2017) Glutamate in Pediatric Obsessive-Compulsive Disorder and Response to Cognitive-Behavioral Therapy: Randomized Clinical Trial. Neuropsychopharmacology 42:2414-2422
Moody, T D; Morfini, F; Cheng, G et al. (2017) Mechanisms of cognitive-behavioral therapy for obsessive-compulsive disorder involve robust and extensive increases in brain network connectivity. Transl Psychiatry 7:e1230
Beucke, Jan C; Sepulcre, Jorge; Buhlmann, Ulrike et al. (2016) Degree connectivity in body dysmorphic disorder and relationships with obsessive and compulsive symptoms. Eur Neuropsychopharmacol 26:1657-66
Armstrong, Casey C; Moody, Teena D; Feusner, Jamie D et al. (2016) Graph-theoretical analysis of resting-state fMRI in pediatric obsessive-compulsive disorder. J Affect Disord 193:175-84
O'Neill, Joseph; Lai, Tsz M; Sheen, Courtney et al. (2016) Cingulate and thalamic metabolites in obsessive-compulsive disorder. Psychiatry Res Neuroimaging 254:34-40

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