Human Intestinal Microbiota in Obesity and Nutritional Transition

Human Intestinal Microbiota in Obesity and Nutritional Transition


Patrocinador principal: Ceprodi S.A. Kot

Colaborador: Institut National de la Santé Et de la Recherche Médicale, France
Institut National de la Recherche Agronomique
Pierre and Marie Curie University
Assistance Publique - Hôpitaux de Paris

Fuente Ceprodi S.A. Kot
Resumen breve

The objectives of this study are: 1-To qualify the relationship between the gut microbiota and the host nutritional and metabolic status during dietary transition.2-To define the impact of nutritional transition on the intestinal microbiota and identify metagenomics signatures of nutritional transition.

Descripción detallada

French overweight (BMI > 27) and obese people (BMI > 30 kg/m2, N=50) will be submitted to a low calorie diet (1200 Kcal) for 8 weeks. This type of intervention is know to modify the metabolic phenotype and expected to change the gut microbiota. Nutritional interventions are planned for 6 months, each subject being studied before (base line), after the intervention (8 weeks) and 2 months after the low calorie diet has stopped and a diet of weight maintenance will be provided. This protocol will be implemented in the nutrition department of the Pitié Salpétrière Hospital in Paris, within the Centre de Recherche en Nutrition Humaine d'Ile-de-France, where patients will be followed on the clinical, biological and histological levels. Evaluation will include medical history, physical, and nutritional evaluations. They will be excluded of the protocol if they had evidence of acute or chronic inflammatory disease, infectious diseases, cancer and/or known alcohol consumption (> 20g per day), as well as other causes of liver, kidney or heart diseases. Physical evaluation will include weight, height, measures of waist/hip ratio, measure of blood pressure. At each time point, body composition will be measured by dual-energy X-ray absorptiometry performed with a total body scanner (Hologic QDR 2500 densitometer). Resting metabolic rate will be evaluated after a one-hour resting period in supine position. Oxygen consumption (VO2) and carbon dioxide production (VCO2), monitored over 30 min by using an open-circuit ventilated-canopy system (Deltatrac II monitor, Datex Instrumentarium Corp., Helsinki, Finland) calibrated with a reference gas. Blood samples will be obtained systematically for biological parameters including lipids (cholesterol, HDL-Chol, TG), insulin and glucose values and OGTT (enabling the determination of insulin sensitivity parameters, adipokines and inflammatory parameters such as leptin, adiponectin, IL-6, TNF alpha, SAA, hsCRP. Serum will be kept for all supplementary measures. The histopathological evaluation of subcutaneous adipose tissue will be performed to evaluate the adipocyte size and the degree of tissue inflammation. Stools samples will be collected for metagenomic studies.

In addition, blood, urine and fecal water samples will be collected and frozen for subsequent metabonomic analysis, and fecal samples for metaproteomic assessment of the microbiota.

Estado general Completed
Fecha de inicio September 2008
Fecha de Terminación March 2011
Fecha de finalización primaria September 2009
Fase N/A
Tipo de estudio Interventional
Resultado primario
Medida Periodo de tiempo
weight loss
intestinal microbiota genes
Body fat mass
Food intake
Resultado secundario
Medida Periodo de tiempo
plasma glucose
adipose tissue genes
Inscripción 49

Tipo de intervención: Other

Nombre de intervención: Caloric transition

Descripción: 6 week low calorie diet followed by 6 week stabilization period



Inclusion Criteria:

1. BMI 27 to 38 kg/m2

2. age: 25 to 65 years.

3. non diabetic subjects

4. fasting glycemia < 1,26 g/l

Exclusion Criteria:

1. SGOT ou SGPT > 2.5x normale

2. Glycemia > 1,26 g/l

3. any other health problem or chronic treatment

Género: All

Edad mínima: 25 Years

Edad máxima: 65 Years

Voluntarios Saludables: Accepts Healthy Volunteers

Oficial general
Apellido Papel Afiliación
Karine Clement, MD, PhD, Prof Principal Investigator Assistance Publique - Hôpitaux de Paris
Instalaciones: Assistance publique-hopitaux de Paris
Ubicacion Paises


Fecha de verificación

March 2011

Fiesta responsable

Nombre Titulo: Karine Clement

Organización: Assistant publique Hopitaux de Paris

Palabras clave
Tiene acceso ampliado No
Condición Examinar
Acrónimo Micro-Obes
Información de diseño del estudio

Asignación: Non-Randomized

Modelo de intervención: Single Group Assignment

Propósito primario: Health Services Research