The purpose of this study is to understand the effects of anxiety on reward responsiveness in adolescents with anorexia nervosa (AN), and how this interaction predicts clinical outcome subsequent to intensive treatment. AN is notorious for its resistance to interventions and for the highest mortality rate of all psychiatric disorders. Variou forms of intensive treatment may succeed in restoring weight, yet overall benefits of treatment remain limited and early relapse is unusually high. While evidence suggests that genetic factors play a role in susceptibility, remarkably little is known about AN's mechanistic neural circuitry. Individuals with AN typically exhibit prodromal anxiety early in life prior to disordered eating. This phenotypic expression may manifest as exaggerated threat perception, and hypersensitivity to and avoidance of signals of weight and shape change. In parallel, individuals with restricting-type AN, beginning in early childhood, are reticent to exposure to novel and high reward environments. This is in line with most psychometric and neuroimaging studies that suggest low responsiveness to natural rewards, as well as aberrant reward system activity and dopaminergic function. However, the interaction between anxiety and reward circuits has never been interrogated in AN. There is substantial evidence of distinct yet overlapping neural systems mediating approach (related to reward) and avoidance (related to anxiety), which are integrated in balancing and switching between behaviors related to the predominant valence state. Thus, we posit that high degrees of reactivity of cortico-limbic circuits underlying anxiety may contribute to diminished capacity to respond to reward stimuli. This may translate clinically to lower motivation to engage in treatment; in effect, a lower drive to change behaviors and thought patterns necessary for improvement based on expectancy of benefits of future outcome, resulting in a course trajectory of weight loss and worsening of symptoms. Accordingly, this study investigates this anxiety and reward interaction in individuals with AN who have recently completed intensive treatment, and whom will be followed for degree of symptom relapse over 6 months. Forty two adolescents with restricting-type AN and 42 matched controls will engage in reward tasks in which individually- tailored anxiety provoking word stimuli are interleaved, while undergoing functional magnetic resonance imaging (fMRI). Reward and anxiety neural circuit activity, and their interaction, will be analyzed in relationship to their ability to predict trajetory of BMI and symptom severity changes over the subsequent 6 months. Using novel designs for interrogating the functionality of positive and negative valence circuits may thus lead to identification of dimensional phenotypes associated with disease persistence, a critical step towards developing individualized and targeted treatment strategies (such as reduction of stimuli-specific anxiety and/or enhancement of positive affect) for high-risk subgroups.

Public Health Relevance

The proposed study will test the interactions between brain circuits involved in reward and anxiety, and how activity in these circuits predicts clinical relape in adolescents with anorexia nervosa after intensive treatment. This study would be the first to use functional neuroimaging markers as predictors of behavioral outcomes in eating disorders. In addition, it sets the foundation for development of much-needed, individually tailored treatment approaches for adolescents at greater risk for relapse, such as targeting engagement of reward motivation timed with anxiety reduction strategies during early treatment.

Agency
National Institute of Health (NIH)
Institute
National Institute of Mental Health (NIMH)
Type
Research Project (R01)
Project #
5R01MH105662-02
Application #
9105571
Study Section
Neural Basis of Psychopathology, Addictions and Sleep Disorders Study Section (NPAS)
Program Officer
Zehr, Julia L
Project Start
2015-07-05
Project End
2020-03-31
Budget Start
2016-04-01
Budget End
2017-03-31
Support Year
2
Fiscal Year
2016
Total Cost
Indirect Cost
Name
University of California Los Angeles
Department
Type
Schools of Medicine
DUNS #
092530369
City
Los Angeles
State
CA
Country
United States
Zip Code
90095
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