Abdominal Adiposity and Muscle Mitochondrial Functions

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Total Enrollment

60 participants

Study Classification

OBSERVATIONAL

Study Start Date

2006-04-30

Study Completion Date

2007-01-31

Brief Summary

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Numerous studies have demonstrated that excess perivisceral adipose tissue is associated with metabolic diseases such as insulin resistance.

In skeletal muscle, insulin resistance has been correlated with reduced mitochondrial oxidative functions. According to the actual theory, mitochondrial dysfunctions are proposed to play a causal role in the aetiology of insulin resistance. Mechanisms involve increased intramyocellular lipids storage. Yet, the causes responsible for the decline in muscle mitochondrial functions remain to be elucidated.

The investigators hypothesize that these alterations are induced by combined changes in plasma profiles of lipids and adipokines, which originate from perivisceral adipose tissue. The study aims at answering the following questions :

* Are muscle mitochondrial functions altered in association with increased perivisceral adipose tissue storage?
* Do changes in the pattern of plasma lipids and adipokines explain this correlation?

Detailed Description

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Sixty 35 to 50-years old sedentary men will be included based on their abdominal circumference (from 75 to over 102 cm).

Body composition will be evaluated using dual-energy X-ray absorptiometry and perivisceral, intramuscular and intrahepatic adiposity will be assess by MRI and proton-NMR spectroscopy. Subjects will be also characterized by their glucose tolerance (OGTT), basal metabolism (indirect calorimetry) and maximal oxygen consumption (maximal aerobic power test on exercise bike).

Blood samples will be collected in the fasted state to assess lipids and adipokines concentrations.

Biopsies will be obtained from the vastus lateralis muscle to examine mitochondrial functions (respiration rates, ATP and superoxide anion production rates, maximal activity of oxidative enzyme). Gene expression of key enzymes, protein and transcription factors involved in lipid and energy metabolism will be assessed using real-time quantitative PCR.

Finally, whole body and muscle protein metabolism will be investigated in half of the subjects using tracer infusion (incorporation of L-\[1-13C\]leucine) and biopsies from vastus lateralis, both in the post-absorptive and post-prandial states (test meal)

Conditions

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Mitochondrial Respiratory Chain Deficiencies

Keywords

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Nutritional and Metabolic Diseases Insulin resistance Energy Metabolisms Skeletal muscle Visceral Adipose Tissue

Study Design

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Observational Model Type

COHORT

Study Time Perspective

PROSPECTIVE

Study Groups

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Abdominal obesity

60 males were recruited according to waist circumference, from lean to obese values

No interventions assigned to this group

Eligibility Criteria

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Inclusion Criteria

* Male subjects
* Age between 35 and 50
* waist circumference \> 75 cm
* Baecke score \< 1 (activity score for sedentary subjects)
* Subjects giving written informed consent
* Subjects willing to comply with the study procedures
* Subjects considered as normal after clinical examination and medical questionnaire

Exclusion Criteria

* Weight change \> 3 kg within 3 months prior to study
* Patients with type 1 or type 2 diabetes
* Serologic evidence of active hepatitis B or HIV
* History of cancer or significant intestinal, hepatic, renal or cardiovascular disorders within the past 5 years
* History of systemic infections or inflammatory diseases within the past 2 months
* Hypocaloric or special diets (e.g. vegetarian)
* Patients currently known to abuse or to be dependent on any drug, including alcohol (daily consumption \> 20g) and tobacco (daily consumption \> 5 cigarettes)
* CRP \< 5 mg/L
* Blood coagulation disorders
* Allergy to xylocaïne
* for test meal : Food allergy (particularly milk allergy and lactose intolerance)
* for MRI : Claustrophobia

Minimum Eligible Age

35 Years

Maximum Eligible Age

50 Years

Eligible Sex

MALE

Accepts Healthy Volunteers

Yes

Responsible Party

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Yves Boirie

Prof.

Responsibility Role PRINCIPAL_INVESTIGATOR

Principal Investigators

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Yves Boirie, PU-PH

Role: PRINCIPAL_INVESTIGATOR

UMR1019 INRA - Auvergne University

Beatrice Morio, PhD

Role: STUDY_DIRECTOR

UMR 1019 INRA - Auvergne University

Locations

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Centre ed Recherche en Nutrition Humaine d'Auvergne (CRNH), Unité d'Exploration Nutritionnelle, Laboratoire de Nutrition humaine

Clermont-Ferrand, , France

Site Status

Countries

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France

References

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Chanseaume E, Tardy AL, Salles J, Giraudet C, Rousset P, Tissandier A, Boirie Y, Morio B. Chronological approach of diet-induced alterations in muscle mitochondrial functions in rats. Obesity (Silver Spring). 2007 Jan;15(1):50-9. doi: 10.1038/oby.2007.511.

Reference Type BACKGROUND

PMID: 17228031 (View on PubMed)

Chanseaume E, Malpuech-Brugere C, Patrac V, Bielicki G, Rousset P, Couturier K, Salles J, Renou JP, Boirie Y, Morio B. Diets high in sugar, fat, and energy induce muscle type-specific adaptations in mitochondrial functions in rats. J Nutr. 2006 Aug;136(8):2194-200. doi: 10.1093/jn/136.8.2194.