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Predictors of Antidepressant Response

This study is currently recruiting participants. (see Contacts and Locations)
Verified May 2015 by University of Michigan
Information provided by (Responsible Party):
Jon-Kar Zubieta, University of Michigan Identifier:
First received: June 12, 2014
Last updated: May 27, 2015
Last verified: May 2015
Major depression is a highly prevalent, frequently debilitating illness that too often fails to respond to currently available treatments such as antidepressant medication. Furthermore, randomized controlled trials of antidepressants consistently demonstrate large placebo effects. The investigators hypothesize that individual differences in the function of key brain circuits underlie the observed variability in clinical responses to both placebo and antidepressant medication. This study will test this hypothesis by recruiting treatment-seeking volunteers with major depression, with or without comorbid nicotine dependence. Volunteers will participate in positron emission tomography (PET) and functional magnetic resonance imaging (fMRI) scans in the context of a treatment trial in which they will receive both placebo and antidepressant medication. A major goal of the study is to improve prediction of individual clinical responses in future treatment trials in which brain imaging may be unavailable, and to study the mechanisms of antidepressant response in Major Depression.

Condition Intervention Phase
Other: Placebo
Drug: Citalopram, or other antidepressant as clinically indicated
Phase 4

Study Type: Interventional
Study Design: Intervention Model: Single Group Assignment
Masking: Single Blind (Subject)

Resource links provided by NLM:

Further study details as provided by University of Michigan:

Primary Outcome Measures:
  • Changes in mu-opioid and dopamine binding potential during PET [ Time Frame: Week 1 and Week 2 ]
  • Changes in BOLD response during reward and decision making fMRI tasks [ Time Frame: Week 1 and Week 2 ]

Secondary Outcome Measures:
  • Depression severity assessed with several depressive questionnaires [ Time Frame: At initial screening, Week 0, Week 2, Week 4, Week 8, and Week 10 visits, or until the participants leave the study. ]
    We will be using the Patient Health Questionnaire-9, Hamilton Depression Rating Scale, Montgomery-Asberg Depression Rating Scale, Quick Inventory of Depressive Symptomatology-Self-Report (QIDS-SR-16).

Other Outcome Measures:
  • Blood samples [ Time Frame: Week 1 and Week 2 ]
    5mL collected for analysis of genetic information, hormone levels, and cortisol levels

  • Neuropsychological test results [ Time Frame: at baseline and Week 10 ]
    Affect processing: Emotional Words Task and Facial Emotion Perception test. Attention and Inhibitory Control: Parametric Go/NoGo, Trail Making test and the Stroop Color Word test . Inferential Reasoning (including cost-benefit analysis): Delayed Discounting of Money Rewards, Iowa Gambling Task, and the Wisconsin Card Sorting Test. Visual Perception: Benton Visual Discrimination Form.

Estimated Enrollment: 80
Study Start Date: January 2011
Estimated Primary Completion Date: October 2015 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: 1-week placebo lead-in followed by open label antidepressant
This is a 1 week placebo-lead in, followed by antidepressant administration. First line antidepressant will be citalopram unless not clinically indicated.
Other: Placebo
Placebo responses will be compared against results of neuroimaging studies with fMRI and PET
Drug: Citalopram, or other antidepressant as clinically indicated
Open label s-citalopram, 20 mg start up dose, increasing to 40 mg as clinically indicated
Other Names:
  • S-citalopram 20-40 mg orally will be the preferred agent.
  • If prior non-response to this medication is noted by the patient,
  • alternative treatments may include another first-line antidepressant:
  • fluoxetine 20 mg
  • paroxetine up to 60 mg
  • sertraline up to 200 mg
  • bupropion up to 300 mg


Ages Eligible for Study:   18 Years to 60 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria: Inclusion criteria will include:

  • Participants diagnosed with Major Depressive Disorder and will include Hamilton Depressive Rating Scale (HDRS) scores >15

Exclusion Criteria:

  • Comorbid conditions that are medical, neurological or psychiatric, pregnancy, use of hormones (including birth control) or use of psychotropic agents
  • We will only permit certain past anxiety disorder diagnoses, including generalized anxiety, panic, agoraphobia, social phobia
  • We also will exclude left-handed individuals and patients who have used any centrally acting medications or recreational drugs with the past 2 months
  • No history of an implant, pacemaker or pacemaker wires, open heart surgery, artificial heart valve, brain aneurysm surgery, middle ear implant, hearing aid, braces or extensive dental work, cataract surgery or lens implant, implanted mechanical or electrical device, or artificial limb or joint
  • No metallic object in their body (such as braces) or have a history of foreign metallic object in the body such as bullets, BB's, pellets, shrapnel, or other metal fragments
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT02178696

Contact: Erich Avery 734-615-7218

United States, Michigan
Department of Psychiatry Recruiting
Ann Arbor, Michigan, United States, 48108
Contact: Erich Avery    734-615-7218   
Principal Investigator: Jon-Kar Zubieta, MD PhD         
Sponsors and Collaborators
University of Michigan
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Jon-Kar Zubieta, MD PhD, University of Michigan Identifier: NCT02178696     History of Changes
Other Study ID Numbers: HUM00033328 
Study First Received: June 12, 2014
Last Updated: May 27, 2015

Additional relevant MeSH terms:
Antidepressive Agents
Psychotropic Drugs
Serotonin Uptake Inhibitors
Neurotransmitter Uptake Inhibitors
Membrane Transport Modulators
Molecular Mechanisms of Pharmacological Action
Neurotransmitter Agents
Serotonin Agents
Physiological Effects of Drugs
Antidepressive Agents, Second-Generation
Antiparkinson Agents
Anti-Dyskinesia Agents
Autonomic Agents
Peripheral Nervous System Agents
Muscarinic Antagonists
Cholinergic Antagonists
Cholinergic Agents processed this record on February 27, 2017