Consequence of Early Trauma on Odor Hedonics Appreciation and DOpamine Release
试验速览
- 阶段
- 不适用
- 状态
- 招募中
- 发起方
- 入组人数
- 30
- 试验地点
- 1
- 主要终点
- Dopamine transmission measured with positron emission tomography
研究概览
简要总结
This prospective, double-blind, parallel-group controlled trial aims to investigate the consequence of early trauma on dopamine release evoked by positive valence odors.
详细描述
The occurrence of early trauma has been linked to alterations in the development of emotion regulation circuits and functional brain connectivity (particularly in the dorsolateral prefrontal cortex - DLPFC), the dopaminergic response to stress and an alteration in hedonicity (including olfactory hedonicity), which can lead to the onset of psychiatric disorders such as anxiety or depression.
However, few studies have investigated the influence of early trauma on the release of dopamine (DA) evoked by odors with a positive emotional valence. Yet hedonicity is a key component of olfaction, as a positive odor leads to reinforced behavior in areas such as food intake and social interaction. This reinforcement process is thought to be underpinned by the very close link between the olfactory system (olfactory tubercle), the emotional regulation system (DLPFC) and the reward system (striatum), including the release of DA.
The aim of the study is to investigate the influence of early trauma on DAergic transmission evoked by odorants with a positive emotional valence.
To this end, 30 participants will be recruited and divided into two groups: those with early trauma and those without, according to their score on the Childhood Trauma Questionnaire. They will undergo an MRI-PET scan during which they will be exposed to pleasant odors. Subcortical dopaminergic transmission will be analyzed using the PET activity of [11C]Raclopride (a D2 receptor antagonist).
Investigators hypothesize that early trauma resulting in abnormal cortico-subcortical and cortico-cortical connectivity would lead to a deficit in the hedonic appreciation of a pleasant odor, associated with a reduction in DAergic reactivity evoked in the reward system.
研究设计
- 研究类型
- Interventional
- 分配方式
- Non Randomized
- 干预模型
- Parallel
- 主要目的
- Basic Science
- 盲法
- Triple (Participant, Care Provider, Investigator)
入排标准
- 年龄范围
- 18 Years 至 30 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Aged 18 years or older
- •Have been selected based on the Childhood Trauma Questionnaire score
- •Non-smoker
- •Be able to speak and read French
- •Sign a consent form before intervention.
排除标准
- •A pre-existing condition that affects olfaction including congenital anosmia, upper respiratory tract infection, nasal and/or sinus disease,
- •Be on medication, with the exception of oral contraceptives
- •Pregnant or breast-feeding woman (check with urine pregnancy tests);
- •Contraindications to TMS or MRI (implanted medical devices or metallic foreign body in the head);
- •Psychiatric disorders
- •Use of psychotropic drugs
- •Have participated in a study involving the injection of a radiotracer during the year
研究组 & 干预措施
Presence of early trauma
In the "presence of early trauma" arm, 15 participants are recruited based on a high Childhood Trauma Questionnaire total score.
干预措施: High score at Childhood Trauma Questionnaire. (Other)
Absence of early trauma
In the "absence of early trauma" arm, 15 participants are recruited based on a low Childhood Trauma Questionnaire total score.
干预措施: Low score at Childhood Trauma Questionnaire. (Other)
结局指标
主要结局
Dopamine transmission measured with positron emission tomography
时间窗: 24 months
Subcortical dopaminergic transmission will be analyzed, using \[11C\]raclopride PET activity (D2 receptor antagonist)
次要结局
- Effective brain connectivity(24 months)
- Odor hedonic appreciation.(24 months)
- Functional brain connectivity.(24 months)