Kappa Opioid Receptor Imaging in Anorexia

Study Overview
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Brief Summary
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The purpose of this study is to use positron emission tomography (PET) imaging and magnetic resonance imaging (MRI) to understand the brain function of individuals with anorexia nervosa and healthy controls.

Detailed Description
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This is a 3-year study involving n=7 women with anorexia nervosa - recovered (AN-REC) from restricting subtype that have achieved a body mass index (BMI) > 18.5 in the past year, are medication free, range in age from 18-55 years and n=7 healthy (medical and psychiatric statues) age- and weight-matched controls who are invited to participate in a medical and psychiatric evaluation, neuroendocrine assessments, one magnetic resonance imaging (MRI) study and one positron emission tomography (PET) study kappa opioid receptor (KOR) 11-carbon (11C) [11C]PKAB and PET. Subjects will be asked to provide written informed consent after full explanation of all study procedures and risks and benefits related to study participation. On the screening day a full medical evaluation including blood work, urine analyses, toxicology, electrocardiogram (ECG) and physical exam will be performed.

Official Title
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Kappa Opioid Receptor Imaging in Anorexia

Conditions
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Anorexia Nervosa

Intervention / Treatment
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* Other: Positron emission tomography (PET) imaging


Participation Criteria
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Eligibility Criteria
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Inclusion criteria for anorexic patients: Able to understand the consent form document A willingness to participate in a psychiatric evaluation, collection of behavioral ratings and neuroendocrine assessments, and imaging studies including 1 PET scan and 1 MRI scan Meets criteria for Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) Anorexia Nervosa (AN) Subjects will be between 18 and 55 years of age Currently weight restored with a body mass index (BMI) > 18.5 for longer than 3 months Inclusion criteria for healthy controls: Able to understand the consent form document A willingness to participate in a psychiatric evaluation, collection of behavioral ratings and neuroendocrine assessments, and imaging studies including 1 PET scan and 1 MRI scan Subjects will be between 18 and 55 years of age Regular menstruation and no personal or first-degree family history of any Axis I diagnosis based on DSM-IV criteria Exclusion criteria for anorexic patients: Any major neurological illness or injury Presence of any legal or illegal psychoactive substances determined with urine toxicology, and breathalyzer test for alcohol Any significant unstable medical condition such as asthma or heart disease which may limit the interpretation of the imaging results, for example due to changes in tracer delivery in hypertensive patients Intelligence quotient (IQ)<70 based on past intelligence Any metal in body that would pose a risk with MRI Claustrophobia that would interfere with MRI or PET imaging Currently pregnant or nursing Exclusion criteria for healthy controls: Any major neurological illness or injury Presence of any legal or illegal psychoactive substances determined with urine toxicology, and breathalyzer test for alcohol Any significant unstable medical condition such as asthma or heart disease which may limit the interpretation of the imaging results, for example due to changes in tracer delivery in hypertensive patients IQ<70 based on past intelligence Any metal in body that would pose a risk with MRI Claustrophobia that would interfere with MRI or PET imaging Currently pregnant or nursing

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 55 Years

Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Anorexia Nervosa - Recovered (AN-REC)<br>Anorexia Nervosa - Recovered (AN-REC) | Other: Positron emission tomography (PET) imaging<br>* Positron emission tomography (PET) imaging<br>|
| Healthy Control (HC)<br>Healthy Control (HC) | Other: Positron emission tomography (PET) imaging<br>* Positron emission tomography (PET) imaging<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Volume of distribution (VT) (i.e., KOR binding) using [11C]PKAB and PET imaging | In this study we are using the KOR radioligand [11C]PKAB and PET to investigate group differences in cerebral KOR binding potential in 7 AN-REC and 7 healthy controls (HCs). | Two months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Anorexia Nervosa, Neuroimaging, Positron emission tomography (PET), [11C]PKAB