Glutamate-Glutamine Cycling (VCYC) During Cocaine Abstinence Using 1H-MRS
试验速览
- 阶段
- 1 期
- 状态
- 已完成
- 入组人数
- 6
- 试验地点
- 1
- 主要终点
- GLU and GLU/GLN ratios
研究概览
简要总结
This study is designed to look at the relationship between brain glucose utilization, neurotransmission (e.g., glutamate, also known as the main excitatory amino-acid neurotransmitter in the brain), and synaptic density. This relationship will be explored in the brain's prefrontal cortex, an area important in decision-making and impulsivity.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Single Group
- 主要目的
- Diagnostic
- 盲法
- None
入排标准
- 年龄范围
- 18 Years 至 55 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Age 18-55 years;
- •Voluntary, written, informed consent;
- •Physically healthy by medical history, physical, neurological, ECG and laboratory examinations;
- •DSM-IV criteria for Cocaine Dependence (304.20) (Note: subjects will also meet DSM-5 criteria for Cocaine Use Disorder);
- •Documented evidence (by urine toxicology) of abstinence from cocaine (2 weeks for scan 1, and 2 and 4 weeks for scans 2 and 3, respectively)
- •Full scale and verbal IQs > 80;
- •For females, a negative serum pregnancy test (β-HCG) at screening and negative urine pregnancy test on PET scan day prior to imaging.
排除标准
- •A history of other substance dependence (e.g., alcohol, opiates, sedative hypnotics), except for nicotine;
- •A primary DSM-IV Axis I major psychiatric disorder (e.g., schizophrenia, bipolar disorder, major depression, etc.) as determined by the Structured Clinical Interview for DSM-IV (SCID);
- •A history of significant medical (e.g., cardiovascular, diabetic/metabolic) or neurological (e.g., cerebrovascular, seizure, traumatic brain injury) illness;
- •Current use of psychotropic and/or potentially psychoactive prescription medications;
- •Medical contraindications to participation in a magnetic resonance imaging procedure (e.g., ferromagnetic implants/foreign bodies, claustrophobia, cardiac pacemaker, prosthetic valve, otologic implant, etc.);
- •For females, laboratory (β-HCG) evidence of pregnancy, physical evidence of pregnancy;
- •For subjects interested in pharmacotherapy component, history of allergies to NAC and current elevation on liver function tests above twice the normal limit;
- •Subjects with 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;
- •Subjects with current, past or anticipated exposure to radiation in the work place within one year of proposed research PET scans;
- •History of a bleeding disorder or are currently taking anticoagulants (such as Coumadin, Heparin, Pradaxa, Xarelto);
- •Blood donation within eight weeks of the start of the study.
研究组 & 干预措施
1H MRS
All subjects will undergo three magnetic resonance spectroscopy (1H-MRS) scans, including before and after two-weeks of placebo and NAC administration.
干预措施: 1H MRS (Diagnostic Test)
[18F]-FDG PET scan
All subjects will undergo [18F]FDG PET to establish previously demonstrated reductions in glucose utilization in PFC and assess VS/nucleus accumbent metabolism at baseline.
干预措施: [18F]FDG PET scan (Diagnostic Test)
[11C]APP311 PET scan
All subjects will undergo [11C]APP311 PET imaging to investigate whether there are differences in synaptic integrity / neuronal plasticity in the brains of individuals abstinent from cocaine compared to healthy controls at baseline.
干预措施: [11C]APP311 PET scan (Diagnostic Test)
Medication (NAC & placebo) administration
Upon completion of baseline (abstinence) 1H-MRS scanning at 7T, CU and HC subjects will participate in two additional 1H-MRS scans, including after 2 weeks of placebo and 2 weeks of NAC administration (3600 mg/day) given in double-blind, randomized, counterbalanced order.
干预措施: N-acetyl cysteine (Drug)
结局指标
主要结局
GLU and GLU/GLN ratios
时间窗: 4 weeks
次要结局
未报告次要终点