Leptin Biology in Adipose Tissue

November 8, 2016 updated by: Virend Somers, Mayo Clinic
Leptin is a fat hormone which acts in maintaining energy balance. However, leptin levels are high in obese subjects indicating resistance to the actions of leptin. High leptin levels have been associated with increased cardiovascular and metabolic risks, but it is not clear if increased leptin or leptin resistance contributes to the increased cardiovascular risk. Further, even though leptin receptors are present in fat tissue, leptin's role in fat tissue functions are not completely investigated in humans. Based on preliminary data the investigators hypothesize that resistance to leptin action in obese adipose tissue is responsible for altering the expression of adipose tissue proteins which contribute to the development of cardiovascular and metabolic dysfunction. To test this hypothesis the investigators propose a novel study directed at investigating the leptin dependent changes in adipose tissue protein expression using adipose tissue obtained from lean and obese human subjects

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Actual)

5

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
    • Minnesota
      • Rochester, Minnesota, United States, 55905
        • Mayo Clinic

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

18 years to 75 years (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Description

Inclusion Criteria:

  1. Age 18-75 years
  2. BMI BMI ≤25 (lean) or >30 kg/m2 (obese)
  3. Going to undergo a surgical procedure where omental and subcutaneous adipose tissue may be biopsied.

Exclusion Criteria:

Inability to provide written informed consent.

-

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: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Other: Normal
Normal weight subjects
Other: obesity
Other: Over weight /obese subjects
Overweight and obese subjects
Other: obesity

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Changes in adipose tissue protein expression in response to leptin treatment
Time Frame: Baseline and after 24 hours of leptin treatment
The effect of leptin on adipose tissue protein expression will be assessed by Western blot method. The adipose tissue biopsy samples will be treated with leptin for 24 hours in sterile culture conditions. After leptin treatment, the tissue will be lysed, proteins will be separated by denatured SDS-PAGE electrophoresis, transferred on a nitrocellulose membrane and changes in specific proteins will be determined using protein-specific antibodies.
Baseline and after 24 hours of leptin treatment

Collaborators and Investigators

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

Sponsor

Mayo Clinic

Investigators

  • Principal Investigator: Virend K Somers, MD PhD, Mayo Clinic

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, 2011

Primary Completion (Actual)

November 1, 2016

Study Completion (Actual)

November 1, 2016

Study Registration Dates

First Submitted

February 26, 2013

First Submitted That Met QC Criteria

February 27, 2013

First Posted (Estimate)

February 28, 2013

Study Record Updates

Last Update Posted (Estimate)

November 10, 2016

Last Update Submitted That Met QC Criteria

November 8, 2016

Last Verified

November 1, 2016

More Information

Terms related to this study

Other Study ID Numbers

  • 11-003834

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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