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Brain Imaging in Depression

2017년 6월 30일 업데이트: National Institute of Mental Health (NIMH)

Muscarinic Cholinergic Receptor Imaging in Depression

The purpose of this study is to use brain imaging technology to examine the role of certain brain receptors and the nervous system chemical acetylcholine in major depression.

The cholinergic system involves the regulation of neurotransmitters and the brain receptors to which they bind. Evidence suggests that the cholinergic system may play a role in the development of depression. Acetylcholine is a neurotransmitter that binds to certain brain receptors called muscarinic cholinergic receptors. Cholinomimetic drugs (drugs that stimulate the cholinergic system) often exacerbate depressive symptoms in people with mood disorders and in healthy individuals. This increase in depressive symptoms may be caused by stimulation of muscarinic acetylcholine receptors (mAChRs), but further study is needed to confirm this. This study will use positron emission tomography (PET) and magnetic resonance imaging (MRI) to study the function of mAChRs in individuals with depression.

Participants in this study will undergo a physical examination, psychiatric interviews, neuropsychological tests, PET and MRI scans, and rating scales of depression, anxiety, and negative thinking symptoms. Questions about behavior and functioning will be asked and blood samples will be collected for genetic analysis.

연구 개요

상태

완전한

상세 설명

Several paths of evidence converge in implicating a role for the cholinergic system in the pathophysiology of affective illness. In both unipolar depressed and euthymic bipolar subjects, cholinomimetic drugs (i.e., muscarinic agonists, acetylcholinesterase inhibitors) exacerbate depressive signs and symptoms such as dysphoria, psychomotor retardation, impairment of attention and memory, hypothalamic pituitary adrenal axis hyperactivity and sleep EEG abnormalities. In healthy subjects, the acetylcholinesterase inhibitor physostigmine elicits a range of depressive symptoms including dysphoria, anergia, psychomotor slowing, emotional lability, sleep disturbances, memory and concentration impairment, and with higher doses, tearfulness and depression. These effects have been shown to reflect stimulation of muscarinic receptors. Cholinomimetics also exacerbate behavioral despair in putative animal models of depression. Conversely, the anticholinergic agent biperidine improved symptoms of depression in a placebo controlled study. Moreover, muscarinic cholinomimetics and a choline rich nutrient, lecithin (phosphatidylcholine) exert antimanic effects in bipolar subjects.

Potentially consistent with these observations, depressed subjects exhibit hypersensitivity to cholinomimetic agents. Administration of muscarinic cholinergic agonists, ACh releasing agents or acetylcholinesterase inhibitors induce exaggerated effects on REM density and latency in depressed subjects than in healthy controls. In addition, both manic and depressed bipolar subjects show increased pupillary sensitivity to the muscarinic cholinergic agonist pilocarpine relative to controls.

Despite the data implicating the mAChR receptor system in mood disorders, no direct in vivo investigations of the central mAChR have been performed in depressed subjects. A novel PET radioligand, [(18)F]FP-TZTP was recently developed by Eckelman as a selective agonist of M(2) receptors. Because the M(2) receptor functions predominately as a presynaptic release-controlling autoreceptor, decreased distribution volume (V) of this receptor could conceivably give rise to increased postsynaptic muscarinic receptor sensitivity.

This application proposes a pilot PET study of M(2) receptor distribution volume in currently depressed subjects with major depressive disorder (n=30), currently depressed subjects with bipolar disorder (n=30), and psychiatrically healthy controls (n=30). The proposed pilot study will test the central hypothesis that M(2) receptor V is decreased in regions where they are primarily located presynaptically in depressed subjects relative to healthy controls. The proposed study will advance knowledge regarding the pathophysiology of depression.

연구 유형

관찰

등록 (실제)

107

연락처 및 위치

이 섹션에서는 연구를 수행하는 사람들의 연락처 정보와 이 연구가 수행되는 장소에 대한 정보를 제공합니다.

연구 장소

    • Maryland
      • Bethesda, Maryland, 미국, 20892
        • National Institutes of Health Clinical Center, 9000 Rockville Pike

참여기준

연구원은 적격성 기준이라는 특정 설명에 맞는 사람을 찾습니다. 이러한 기준의 몇 가지 예는 개인의 일반적인 건강 상태 또는 이전 치료입니다.

자격 기준

공부할 수 있는 나이

18년 (성인)

건강한 자원 봉사자를 받아들입니다

연구 대상 성별

모두

설명

  • INCLUSION CRITERIA - MDD Depressed Sample:

Thirty subjects (ages 18-45) male and female will be selected, with primary MDD currently depressed as defined by DSM-IV criteria for recurrent MDD and current HDRS score in the moderately-to-severely depressed range (greater than 18) and who have a first degree relative with MDD but no first degree relatives with mania, alcoholism, or antisocial personality disorder.

INCLUSION CRITERIA - Bipolar Depressed Sample:

Thirty subjects (ages 18-45) male and female will be selected who meet DSM-IV criteria for bipolar I or II disorder and are currently depressed, with HDRS score in the moderately-to-severely depressed range (greater than 18). Subjects may be inpatients or outpatients. Because effective treatment will not be discontinued for the purposes of this protocol, subjects will be identified who have never been treated or who have discontinued medication due to lack of efficacy, noncompliance, physician order, or other reasons prior to study entry.

INCLUSION CRITERIA - Healthy, Control Sample:

Thirty subjects (ages 18-45) male and female who have not met criteria for any major psychiatric disorder will be selected. From this large sample a control subject will be matched to each depressed subject for age, gender, handedness and stage of menstrual cycle. The control subjects will have no known first degree relatives with mood disorders.

EXCLUSION CRITERIA:

Subjects must not have taken antidepressant or other medications likely to alter monoamine neurochemistry or cerebrovascular function for at least 3 weeks (8 weeks for fluoxetine and for any drug with known anticholinergic effects) prior to scanning. Because effective medications will not be discontinued for the purposes of this study, subjects will be identified who have never been treated or who have discontinued medication due to lack of efficacy, noncompliance, physician order or other reasons prior to study entry. Subjects will also be excluded if they: a) serious suidical ideation or behavior - 1) thoughts of suicide within the past three months which are accompanied by intet to harm oneself, serious consideration of means or plan to attempt suicide, evidence of arranging for a suicide attemp (e.g. giving away prized possessions, updating a will) or clear desire to commit suicide; 2) suicide attempts within the previous one year; or 3) a current plan to inflict self harm or physical evidence suspicious for having engaged in a suicide attempt.

Subjects will also be excluded if they had any significant comorbid condition in the last year, c) psychosis to the extent that the ability to provide informed consent is in doubt, d) history of any major psychiatric disorder (other than the target mood disorder) arising temporally before the initial mood episode, e) medical or neurological illnesses (i.e. seizure disorder, a coma in past) likely to affect physiology or anatomy, f) a history of drug or alcohol abuse within 1 year or a lifetime history of alcohol or drug dependence (DSM IV criteria), g) are HIV positive or have AIDS, h) current pregnancy (documented by history and pregnancy testing prior to scanning), i) current breast feeding, j) general MRI exclusion criteria which include the subject having a pacemaker or significant claustrophobia and k) if they are smokers.

공부 계획

이 섹션에서는 연구 설계 방법과 연구가 측정하는 내용을 포함하여 연구 계획에 대한 세부 정보를 제공합니다.

연구는 어떻게 설계됩니까?

공동 작업자 및 조사자

여기에서 이 연구와 관련된 사람과 조직을 찾을 수 있습니다.

간행물 및 유용한 링크

연구에 대한 정보 입력을 담당하는 사람이 자발적으로 이러한 간행물을 제공합니다. 이것은 연구와 관련된 모든 것에 관한 것일 수 있습니다.

연구 기록 날짜

이 날짜는 ClinicalTrials.gov에 대한 연구 기록 및 요약 결과 제출의 진행 상황을 추적합니다. 연구 기록 및 보고된 결과는 공개 웹사이트에 게시되기 전에 특정 품질 관리 기준을 충족하는지 확인하기 위해 국립 의학 도서관(NLM)에서 검토합니다.

연구 주요 날짜

연구 시작

2002년 12월 16일

연구 완료

2010년 5월 14일

연구 등록 날짜

최초 제출

2002년 12월 17일

QC 기준을 충족하는 최초 제출

2002년 12월 17일

처음 게시됨 (추정)

2002년 12월 18일

연구 기록 업데이트

마지막 업데이트 게시됨 (실제)

2017년 7월 2일

QC 기준을 충족하는 마지막 업데이트 제출

2017년 6월 30일

마지막으로 확인됨

2010년 5월 14일

추가 정보

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