Recombinant Human Leptin Therapy Effects on Insulin Action (Leptin)

June 11, 2015 updated by: Washington University School of Medicine
Leptin therapy improves insulin sensitivity in people with leptin-deficiency but it is not known whether it improves insulin action in persons who are not leptin deficient. The purpose of the present study was to determine whether leptin therapy has effects on insulin action in obese subjects with type 2 diabetes mellitus (T2DM). A randomized, placebo controlled trial was conducted in obese subjects with newly-diagnosed T2DM. Subjects were randomized to treatment with placebo, low-dose, or high-dose leptin. Insulin sensitivity was measured.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

Leptin therapy improves insulin sensitivity in people with leptin-deficiency but it is not known whether it improves insulin action in persons who are not leptin deficient. The purpose of the present study was to determine whether leptin therapy has weight loss-independent effects on insulin action in obese subjects with type 2 diabetes mellitus (T2DM). A randomized, placebo controlled trial was conducted in obese subjects with newly-diagnosed T2DM. Subjects were randomized to treatment with placebo (saline), low-dose (30 mg/d), or high-dose (80 mg/d) recombinant methionyl human (r-met hu) leptin for 14 days. Multi-organ insulin sensitivity before and after treatment was evaluated by using the hyperinsulinemic-euglycemic clamp procedure in conjunction with stable isotopically labelled tracer infusions to measure glucose, glycerol and fatty acid kinetics.

Study Type

Interventional

Enrollment (Actual)

18

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Missouri
      • Saint Louis, Missouri, United States, 63110
        • Washington University School of Medicine

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

25 years to 75 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • diagnosed with type 2 diabetes for less than ten years
  • Body mass index 25 - 40
  • hemoglobin A1C 7.5% - 12.0%
  • fasting blood glucose between 90 and 240mg/dL

Exclusion Criteria:

  • smoking
  • pregnancy
  • diabetes medications
  • regular exercise (more than 3 hours per week)
  • uncontrolled hypertension: systolic blood pressure greater than 160 or diastolic blood pressure greater than 95

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Basic Science
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Single

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Placebo Comparator: placebo
saline placebo for fourteen days
Dietary supplement: placebo
saline placebo
Experimental: low-dose leptin
30mg per day of recombinant methionyl human (r-met hu) leptin for fourteen days
Drug: low-dose leptin
30mg per day of recombinant methionyl human (r-met hu) leptin for fourteen days
Experimental: high-dose leptin
80mg per day of recombinant methionyl human (r-met hu) leptin for fourteen days
Drug: high-dose leptin
80mg per day of recombinant methionyl human (r-met hu) leptin for fourteen days

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Baseline Glucose Disposal - a Measure of the Body's Ability to Process Sugars.
Time Frame: baseline
pre-treatment glucose disposal. In general, a high glucose disposal rate is a marker of healthy metabolic function. Glucose disposal is measured by tracking the amount of tagged glucose in the bloodstream over time. It is adjusted to subject body weight.
baseline
Post-treatment Glucose Disposal. I.e. Glucose Disposal After Treatment With Leptin or Placebo.
Time Frame: fourteen days
This is a measure of the body's ability to metabolize sugar after treatment with either leptin or a placebo. We compare the effect of leptin therapy on insulin-mediated stimulation of glucose disposal with that of placebo. In general, a high glucose disposal rate is a marker of healthy metabolic function. Glucose disposal is measured by tracking the amount of tagged glucose in the bloodstream over time. It is adjusted to subject body weight.
fourteen days

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Baseline Plasma Leptin Concentrations
Time Frame: baseline
Leptin is an endogenous hormone. Here we measure the pre-treatment concentration of naturally-occurring leptin in the blood.
baseline
Post-treatment Plasma Leptin Levels
Time Frame: fourteen days
plasma leptin levels after fourteen days ingestion of either leptin or placebo.
fourteen days

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Washington University School of Medicine

Collaborators

National Institutes of Health (NIH)
Amgen

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

August 1, 1998

Primary Completion (Actual)

July 1, 2000

Study Completion (Actual)

July 1, 2000

Study Registration Dates

First Submitted

September 21, 2010

First Submitted That Met QC Criteria

September 22, 2010

First Posted (Estimate)

September 23, 2010

Study Record Updates

Last Update Posted (Estimate)

July 9, 2015

Last Update Submitted That Met QC Criteria

June 11, 2015

Last Verified

June 1, 2015

More Information

Terms related to this study

Keywords

Other Study ID Numbers

  • 98-0643

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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