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Sponsors and Collaborators: |
University of Texas Southwestern Medical Center GlaxoSmithKline |
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Information provided by: | University of Texas Southwestern Medical Center |
ClinicalTrials.gov Identifier: | NCT00746174 |
This study will include subjects with an abnormal glucose tolerance test. Using a crossover design, we will evaluate the insulin sensitivity and intracellular lipid content of the heart, liver and skeletal muscle of subjects before and after therapy with Rosiglitazone and placebo. We hypothesize that Rosiglitazone will improve insulin sensitivity in association with reduced muscle lipid content that may arise either from increased lipid oxidation or enhanced storage of fat in adipose tissue.
Condition | Intervention | Phase |
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Insulin Sensitivity |
Drug: Rosiglitazone Drug: Placebo |
Phase IV |
Study Type: | Interventional |
Study Design: | Treatment, Randomized, Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor), Placebo Control, Crossover Assignment |
Official Title: | Insulin Resistance and Intramyocellular Lipid Content in Glucose Intolerant Subjects Receiving Rosiglitazone |
Enrollment: | 24 |
Study Start Date: | February 2004 |
Study Completion Date: | February 2008 |
Primary Completion Date: | March 2007 (Final data collection date for primary outcome measure) |
Arms | Assigned Interventions |
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Rosiglitazone: Active Comparator
Subjects in this arm will be randomly assigned to treatment with Rosiglitazone 4mg daily. After 4 weeks, we will assess changes in glucose levels and liver enzymes. The dose will then be increased to Rosiglitazone 8mg daily (if indicated). The patients will be reevaluated every 4 weeks, and at the end of 16 weeks, the participants will all be admitted to the research center at UTSW to measure changes in the following: 1) insulin sensitivity; 2) lipid content of heart, liver, & skeletal muscle; and 3) lipid oxidation using respiratory gas exchange. The patients will then switch to the alternative therapy for 16 additional weeks before the studies are repeated.
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Drug: Rosiglitazone
Rosiglitazone 8mg PO daily for 16 weeks
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Placebo: Placebo Comparator
Subjects in this arm will be randomly assigned to treatment with placebo. After 4 weeks, we will assess changes in glucose levels and liver enzymes. The patients will be reevaluated every 4 weeks, and at the end of 16 weeks, the participants will all be admitted to the research center at UTSW to measure changes in the following: 1) insulin sensitivity; 2) lipid content of heart, liver, & skeletal muscle; and 3) lipid oxidation using respiratory gas exchange. The patients will then switch to the alternative therapy for 16 additional weeks before the studies are repeated.
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Drug: Placebo
Placebo 1 tablet PO daily for 16 weeks
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This protocol is a crossover study that will include subjects with an abnormal glucose tolerance test. Participants will be treated in a community-based practice setting and will receive detailed instruction on diet and glucose self-monitoring. The patients will be randomly assigned to treatment with 4 mg daily of Rosiglitazone or placebo. They will return to the clinic after 4 weeks to monitor changes in glucose levels, HbA1c and liver enzymes. The drug dose will be increased as indicated to 8 mg daily and the patients will be reevaluated every 4 weeks. The participants will all be admitted to the General Clinical Research Center at UT-Southwestern Medical Center at the end of 16 weeks to measure changes in the following primary endpoints: 1) insulin sensitivity, 2) lipid content of heart, liver, and skeletal muscle, 3) lipid oxidation. Additional noninvasive HMRS measurements will be made to quantify the muscle lipid content and respiratory gas exchange will be used to assess lipid oxidation. Following the GCRC admission, patients will switch to the alternative therapy for 16 additional weeks before the studies are repeated. We expect Rosiglitazone to improve insulin sensitivity in association with reduced muscle lipid content that may arise either from increased lipid oxidation or enhanced storage of fat in adipose tissue.
Ages Eligible for Study: | 30 Years to 65 Years |
Genders Eligible for Study: | Both |
Accepts Healthy Volunteers: | No |
Inclusion Criteria:
Exclusion Criteria:
United States, Texas | |
University of Texas Southwestern Medical Center at Dallas | |
Dallas, Texas, United States, 75390 |
Principal Investigator: | Lidia S Szczepaniak, PhD | University of Texas Southwestern Medical Center at Dallas |
Responsible Party: | University of Texas Southwestern Medical Center ( Lidia S. Szczepaniak, PhD. ) |
Study ID Numbers: | GSK CRT49653/250 |
Study First Received: | August 29, 2008 |
Last Updated: | September 2, 2008 |
ClinicalTrials.gov Identifier: | NCT00746174 |
Health Authority: | United States: Institutional Review Board |
insulin sensitivity magnetic resonance spectroscopy (MRS) lipotoxicity lipid oxidation |
thiazolidinediones intracellular triglyceride content |
Hyperinsulinism Metabolic Diseases 2,4-thiazolidinedione Insulin Resistance |
Metabolic disorder Glucose Metabolism Disorders Rosiglitazone Insulin |
Hypoglycemic Agents Physiological Effects of Drugs Pharmacologic Actions |