Inflammation Regulation in Obese Patients

September 17, 2015 updated by: University Hospital, Montpellier

Relations Between Obesity and Insulin Resistance: Role of Inflammation Regulatory Mechanisms in Obese Patients Without Associated Comorbidity

Insulin resistance is one of the main mechanisms involved in metabolic diseases. inflammation has been implicated in its pathogenesis, due to innate immunity activation by free fatty acids, lipopolysaccharides (LPS) and lactate. Free fatty acids, LPS and lactate activate innate immunity in squelettal muscle and adipose tissue via Toll-like receptor 2/4, NFkB, IRF3 (Interferon Responsive Factor 3) and cytokines secretion (TNFa, IFN g, IL1b, IL6), chemokines secretion (MCP1) and leukotrienes (LTB4). Feed back mechanisms involved in TLR signaling pathways as RLI (ribonuclease L inhibitor)/ABCE1, have never been studied in inflammation due to obesity. RLI inhibits an endoribonuclease, RNase L, which has been recently implicated in TLR signaling The purpose of this study is to analyse the role of RLI and RNase L in TLR regulation, and its potential implication in the link between obesity, inflammation and insulin resistance in adipose tissue and squeletal muscle in humans.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

The investigators working hypothesis is that RNase L and RLI contribute to chronic inflammation regulation and to insulin response through TLR 4 pathway regulation in obesity. The investigators main purpose is to compare innate immunity activation pathway between insulin sensitive, insulin resistant obese patients and control patients. Insulin sensitive and insulin resistant obese patients will be distinguish thanks to the HOMA ir index. The investigators second objectives are to evaluate if the degree of inflammation in adipose tissue and squeletal muscle is correlated to insulin sensitivity measured by hyperinsulinemic euglycemic clamp and to characterise inflammatory pathway and regulation pathway. A special focus will be given to the leukotrienes and their potential role in insulin resistance pathogenesis. The investigators will have two approaches:- characterisation of subjects with normal weight, of obese insulin sensitive and obese insulin resistant through a metabolic evaluation, an inflammatory characterisation and a measure of insulin sensitivity at the systemic level, in adipose tissue and in squeletal muscle.- an in vitron approach with human myoblast and adipocytes culture, extracted from the investigators patients: characterisation of inflammation, innate immunity.

Study Type

Interventional

Enrollment (Actual)

30

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

  • France
      • Montpellier, France, 34295
        • Montpellier University Hospital

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

50 years to 65 years (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Age between 50 and 65 years old
  • Men/ menopausal women
  • BMI <25 kg/m2 for the control group, BMI >30 kg/m2 for the obese group
  • Non diabetic patients
  • HOMAIR <3 for the insulin sensitive obese group
  • Non smoking
  • Without any inflammatory disease
  • Without any first degrees relative with diabetes
  • Without any treatment that could interfere with insulin sensitivity
  • without any infection

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

  • Allocation: Non-Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Active Comparator: volunteers
not overweight Volunteers responding to the study criteria
Other: muscle and fat biopsy
muscle and fat biopsy
Experimental: overweight patients insulin sensitive
overweight patients insulin sensitive responding to the study criteria
Other: muscle and fat biopsy
muscle and fat biopsy
Experimental: overweight insulin resistant
overweight patients insulin resistant responding to the study criteria
Other: muscle and fat biopsy
muscle and fat biopsy

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
TLR regulation
Time Frame: 2 years
analyse the role of RLI and RNase L in TLR regulation, and its potential implication in the link between obesity, microinflammation and insulin resistance in adipose tissue and squelettal muscle in humans.
2 years

Collaborators and Investigators

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

Sponsor

University Hospital, Montpellier

Investigators

  • Study Chair: Jacques Mercier, University Hospital, Montpellier

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

November 1, 2011

Primary Completion (Actual)

November 1, 2011

Study Completion (Actual)

December 1, 2013

Study Registration Dates

First Submitted

March 6, 2012

First Submitted That Met QC Criteria

March 21, 2012

First Posted (Estimate)

March 23, 2012

Study Record Updates

Last Update Posted (Estimate)

September 18, 2015

Last Update Submitted That Met QC Criteria

September 17, 2015

Last Verified

March 1, 2012

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 8685

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.

Clinical Trials on Obesity

Clinical Trials on muscle and fat biopsy

Search Similar Trials

Sponsors and Collaborators

Medical Conditions

Drug Interventions

CROs by country

CROs in Montenegro

Conditions

Rare Diseases

Drug Interventions

Dietary Supplements

Sponsor/Collaborators

Locations

3
Subscribe