Effects of Genotype on Resting State Connectivity During Methamphetamine Administration

Summary

Addiction to methamphetamine (MA) is a serious health problem in the United States. Right now, there are no medically approved treatments for MA dependence. More research is needed to understand how MA affects the brain and to eventually develop medical interventions for MA addiction. The purpose of the study is to learn more about how MA use affects the brain by investigating a receptor in the brain called trace amine-associated receptor 1 (TAAR1). The investigators are hoping to find out if individuals with certain versions of the brain receptor react differently when given MA. The TAAR1 receptor has two prevalent genetic variations due to a single nucleotide polymorphism. These are the wild type (WT) and a common variant (CV). Preliminary studies have shown that these variants produce different connectivity (resting state functional connectivity or RSFC) in the brains of individuals with MA use disorder (MUD), specifically that individuals with the CV genotype exhibit lower RSFC than WT. In this study, MA will be administered to individuals with MA use disorder and healthy controls in order to:

1. Determine the influence of CV vs. WT genotype on RSFC and craving in individuals with chronic MUD and healthy controls.
2. Determine the effect of acute methamphetamine or placebo administration on the interaction of CV vs WT genotype on RSFC, craving, cognitive control, attention and subjective experience in MUD and healthy controls.

Conditions

• Methamphetamine-dependence

Interventions

BEHAVIORAL

Magnetic resonance imaging (MRI)

On visits 2 and 3, subjects will undergo a baseline MRI scan approximately 1 hour after the start of each visit followed by drug administration (placebo or MA) and a second scan 1.5 hours after that.

DRUG

Methamphetamine Hydrochloride Tablets

Study participants will receive an oral dose of methamphetamine hydrochloride on one of two scan days and an identical looking placebo in tablet form on the other scan day. Drug type will be randomized between the two visits. Participants will receive the following doses of methamphetamine hydrochloride in accordance with their weight: if weight is between 50-60 kg, 15 mg dose of methamphetamine hydrochloride will be administered. Similarly, for 60-80 kg, 20 mg dose; 80-100 kg, 25 mg dose; and 100+ kg, 30 mg dose.

DRUG

Placebo oral tablet

Study participants will receive an oral dose of methamphetamine hydrochloride on one of two scan days and an identical looking placebo in tablet form on the other scan day. Drug type will be randomized between the two visits.

Sponsors & Collaborators

• Portland VA Medical Center

  collaborator FED

• Oregon Health and Science University

  lead OTHER

Principal Investigators

• William Hoffman, MD, PhD · Oregon Health and Science University

Study Design

Allocation

RANDOMIZED

Purpose

DIAGNOSTIC

Masking

DOUBLE

Model

CROSSOVER

Eligibility

Min Age

18 Years

Max Age

55 Years

Sex

ALL

Healthy Volunteers

Yes

Timeline & Regulatory

Start

2019-08-16

Primary Completion

2023-03-31

Completion

2023-03-31

FDA Drug

Yes

Countries

• United States

Study Locations