Examination of Glutamate and mGluR5 in Psychiatric Disorders

Summary

This research study is designed to look at the involvement of the glutamate system in depression. Each subject will undergo a screening appointment to determine study eligibility. Thereafter, the study will take 2 or 3 visits depending on schedule availability and will consist of one MRI scan, and PET scan. Subjects will also participate in cognitive testing. Depending on camera time, staff availability and subject schedule, total study participation may last 1-2 months.

Conditions

• Major Depressive Disorder
• Post-Traumatic Stress Disorder
• Bipolar Disorder

Interventions

BEHAVIORAL

Cognitive Testing

Verbal assessments as well as computer testing.

OTHER

MRI

Anatomical MRIs will be performed on a Siemens 3T Trio at Yale. MR acquisition will be a Sag 3D magnetization-prepared rapid gradient-echo (MPRAGE) sequence with 3.34 ms echo time, 2,500 ms repetition time, 1,000 ms inversion time, 7 degree flip angle, and 180 Hz/pixel bandwidth. The image dimensions will be 256 x 256 x 176 and pixel size 0.98 x 0.98 x 1.0 mm. Resting state MRIs will also be obtained as follows: We will be doing 2 six minute scans with subjects in the scanner, eyes open, fixating a cross. TR = 3 secs 45 slices x 3 mm slice thickness = 13.5 cm. In plane resolution = 3 x 3 mm, slice acquisition order = ascending.

RADIATION

PET

High Resolution Research Tomograph (HRRT), the highest resolution human brain scanner available, or HR+ will be used to image subjects. Vital signs (blood pressure, pulse, respiration) will be obtained before and after radiotracer administration. An antecubital venous catheter will be used for IV administration of the radiotracer and for venous blood sampling. A radial artery catheter will be inserted by an experienced physician before the PET scan. At the beginning of each scan, the subject's head will be immobilized and a 6 minute transmission scan using an orbiting 137Cs (HRRT) or 68GE (HR+) point-source is obtained and used for attenuation correction. PET scans will be acquired using bolus or bolus plus constant infusion administration of FPEB or ABP688.

Sponsors & Collaborators

• VA Office of Research and Development

  collaborator FED

• Yale University

  lead OTHER

Principal Investigators

• Irina Esterlis, PhD · Yale University

Study Design

Allocation

NON_RANDOMIZED

Purpose

OTHER

Masking

NONE

Model

PARALLEL

Eligibility

Min Age

18 Years

Max Age

70 Years

Sex

ALL

Healthy Volunteers

Yes

Timeline & Regulatory

Start

2012-02-21

Primary Completion

2022-01-13

Completion

2022-01-13

Countries

• United States

Study Locations