PET Imaging of mGLuR5 With Drug Challenge

Status Completed

Clinical Trial Summary

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 fMRI scans, and up to three 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.

Clinical Trial Description

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).

Hypothesis 4: We expect there should not be a significant difference in reduction in mGluR5 availability due to differences in ABP688 radiotracer infusion. ;

Study Design

Intervention Model: Single Group Assignment, Masking: Open Label

Related Conditions & MeSH terms

Clinical Trial Details

NCT number	NCT01691092
Study type	Interventional
Source	Yale University
Contact
Status	Completed
Phase	N/A
Start date	June 2012
Completion date	February 2016

View Details

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Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.

Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.