PET Imaging of mGluR5 With Drug Challenge
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 79
- 试验地点
- 3
- 主要终点
- Change in Glutamate Levels at Baseline and After Ketamine Administration as Confirmed by Positron Emission Tomography (PET) Imaging
研究概览
简要总结
This study is designed to look at that involvement of a process in the brain called the glutamate system in depression. Participants will undergo a screening session, up to two functional Magnetic Resonance Imaging (fMRI) scans, and up to three Positron Emission Tomography (PET) scans, as well as cognitive testing at each scan session. For one of the PET scans, a drug (either ketamine or n-acetyl cysteine) will be administered.
Hypothesis 1: The investigators hypothesize administration of ketamine or n-acetylcysteine (NAC) will lead to a decrease in mGluR5.
Hypothesis 2: The investigators hypothesize an improvement in memory and attentional skills after drug challenge.
Hypothesis 3: The investigators hypothesize an increase in mGluR5 availability and change in MRI measures post drug challenge as compared to baseline, signifying synaptogenesis.
Hypothesis 4: We expect there should not be a significant difference in reduction in mGluR5 availability due to differences in ABP688 radiotracer infusion.
详细描述
Aim 1: To determine the acute effect of medication-induced glutamate release on mGluR5 availability in human subjects. Hypothesis 1: We hypothesize administration of ketamine or n-acetylcysteine (NAC) will lead to a decrease in mGluR5 availability.
Aim 2: To determine if glutamate release via administration of ketamine or NAC has pro cognitive benefits.
Hypothesis 2: We hypothesize an improvement in memory and attentional skills after drug challenge.
Aim 3: To determine if there is synaptogenesis detectable by PET and MRI post ketamine or NAC within a week of drug challenge (at the time of greatest antidepressant response). Hypothesis 3: We hypothesize an increase in mGluR5 availability and change in MRI measures, post drug challenge as compared to baseline, signifying synaptogenesis.
Aim 4: To determine if there is a difference in reduction of mGluR5 availability after ketamine administration when radiotracer is administered bolus as compared to bolus to constant infusion in the same subjects (ABP688 radiotracer only).
研究设计
- 研究类型
- Interventional
- 分配方式
- Na
- 干预模型
- Single Group
- 主要目的
- Other
- 盲法
- None
入排标准
- 年龄范围
- 18 Years 至 65 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •18-65 years old
- •English speaking
- •No other Diagnostic and Statistical Manual of Mental Disorders-Fourth Edition (DSM-IV) diagnosis present, besides required as below.
- •Inclusion criteria for depressed subjects
- •clinical diagnosis of a current or past depressive episode
- •medication free for at least 2 weeks
- •Score >16 on Hamilton Depression Rating Scale (HDRS) if currently depressed or <11 if not currently depressed
- •treatment or non-treatment seeking who understand that this study is for research purposes only
- •Inclusion criteria for healthy controls
- •no current, or history of, any DSM-IV diagnosis
- •no first-degree relative with history of psychotic, mood, or anxiety disorder
- •Inclusion criteria for PTSD subjects
- •current Post-Traumatic Stress Disorder, as determined by the Structured Clinical Interview for DSM-IV-Text Revision (TR) (SCID) patient research edition
- •Clinician Administered PTSD Scale for DSM-IV-TR (CAPS) score of 50 or higher
- •Inclusion criteria for trauma control subjects
- •history of trauma (meeting the criterion A of PTSD but not a full diagnosis of PTSD)
排除标准
- •Current or past significant medical, neurological, or metabolic disorder or loss of consciousness for 5 minutes or more
- •active, significant suicidal ideation
- •implanted metallic devices or any Magnetic Resonance (MR) contraindications
- •women who are pregnant or breastfeeding
- •met DSM-IV criteria for alcohol/illicit substance dependence in their life-time or met alcohol/illicit substance abuse within past year
- •history of prior radiation exposure for research purposes within the past year such that participation in this study would place them over FDA limits for annual radiation exposure. This guideline is an effective dose of 5 rem received per year
- •blood donation within eight weeks of the start of the study
- •radiation exposure at work that precludes study participation
- •blood pressure >140/80
研究组 & 干预措施
Ketamine
All subjects will receive ketamine
干预措施: Ketamine (Drug)
结局指标
主要结局
Change in Glutamate Levels at Baseline and After Ketamine Administration as Confirmed by Positron Emission Tomography (PET) Imaging
时间窗: 1st scan: 90 minute baseline scan; 2nd scan: 90 minutes, ketamine administration at start of scan; scan 3: 90 minute scan 24 hours post ketamine
PET imaging obtained in healthy and Major Depressive Disorder (MDD) subjects. Glutamate levels determined by radiotracer uptake in PET images.
次要结局
未报告次要终点