Assessing the Value of Red Grapes Polyphenol Supplementation on Metabolic Parameters in Obese Insulinoresistant Subjects (POLYGIR)

Assessing the Value of Red Grapes Polyphenol Supplementation on Metabolic Parameters in Obese Insulinoresistant Subjects : Study Randomized Versus Placebo

Obesity, chronic disease, is a real public health problem because of its high prevalence but also because of the high risk of complications, including insulin resistance (IR) and type 2 diabetes (T2D). The mechanisms involved in the development of IR are not well known. Oxidative stress and inflammation induced by food overload could be the initiators IR mechanisms in skeletal muscle, responsible for the use of nearly 80% glucose in response to insulin and therefore plays a major role in the regulation of glucose metabolism. Thus, an increase in ROS (Reactive Oxygen Species), markers of oxidative stress and chronic low-grade inflammation have been demonstrated in subjects with obesity, the latter decreasing in weight loss. Therapeutically, loosing weight is still very difficult these days, because of the complexity of this chronic disease. Thus, it is well established that restrictive diets to expose weight rebound, dramatic medically as in human terms for these patients. Support for physical activity is also difficult because of reduced mobility in patients, refer to the lack of motivation among some. Finally, investigators have no treatment "against-obesity" who have demonstrated a benefit / risk enough to be used routinely. It is therefore essential to seek other means of struggle against the IR, see help in weight loss.

In parallel, it is well established that the consumption of certain antioxidants, including polyphenols (PP) grape as extracts and whole foods, modulates favorably several pathways responsible for the development of IR in cell models animals. The results of antioxidants supplementation in humans are few and controversial. However, most supplementation studies in human used a PP, Resveratrol at supra nutritional doses (ie not compatible with a balanced diet of fruits and vegetables). In a previous study, investigators tested the interest of a supplementation with red grape PP nutritional doses in healthy subjects with metabolic risk (overweight subjects and related to the first degree of T2DM patients) on IR hyperinsulinemic euglycemic clamp measured. During this study, the PP have prevented the central mechanisms of muscle IR that are oxidative stress and mitochondrial dysfunction induced by a load fructose.

For this project, investigators propose to test the effect of a red grape PP supplementation at nutritional doses for 8 weeks on IR and weight loss in 30 obese insulin resistant. This is a double-blind randomized placebo-controlled. This supplementation will be associated with a standard support for their obesity performed routinely in the Nutrition and Diabetes unit.

Specific inclusion criteria: Female or male nondiabetic 50-65 years, BMI> 30 kg / m2 and with a HOMA> 3.

The main objective is to test whether supplementation PP improves systemic insulin sensitivity (GIR: rate glucose infusion) measured by hyperinsulinemic-euglycemic clamp (gold standard for measuring insulin sensitivity) in insulin-resistant obese subjects.

Secondary objectives are to:

• Test whether supplementation PP improves insulin sensitivity to tissue (fat and muscle) and compare the response to supplementation in these two tissues.
• Determining the cellular and molecular mechanisms involved in improving IR: regulation of inflammation, oxidative stress.
• Determine whether supplementation PP optimizes weight reduction compared to a standard single support.

NSN: The number of subjects required was evaluated from our previous work (2013 Hokayem et al.) Whose main objective was to assess the impact of PD versus placebo in first degree relatives of patients with diabetes type 2. Under a bilateral alternative hypothesis of a nonparametric test (Mann-Whitney), 1: 1 ratio, a power of 80% and an alpha risk of 0.05, the number of subjects was estimated at 15 per group.

Methodology: Anthropometric measurements, assessment of body composition (DEXA) system application characterization (metabolism, inflammation, oxidative stress, adipokines and insulin sensitivity: clamp hyperinsulinemic-euglycemic, lipopolysaccharides: LPS) / tissue characterization (biopsies of skeletal muscle and tissue adipose): insulin sensitivity, inflammation, oxidative stress, gene regulation (sirt1), mitochondrial activity / cell characterization (adipocyte precursor and muscle) insulin sensitivity, inflammation, oxidative stress, sirt1.

Investigators hope to demonstrate that a non-pharmacological treatment based on nutritional doses of PP supplementation can improve insulin sensitivity in insulin-resistant obese patients, refer to optimize weight loss compared to a standardized management of obesity and determine the mechanisms involved.

Study Overview

• Status: Completed
• Conditions: Obesity; Insulin Resistance; Menopause
• Intervention / Treatment: Other: Supplementation with red grapes polyphenol

• Study Type: Interventional
• Enrollment (Actual): 23
• Phase: Not Applicable

Contacts and Locations

Study Locations

• France
  • Montpellier, France, 34295
    • CHU Montpellier - Lapeyronie hospital

Participation Criteria

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:

Specific inclusion criteria:

• Female or Male non diabetic
• Female postmenopausal, non hormono-substituted,
• 50-65 years,
• BMI> 30 kg / m2
• HOMA - IR > 3

Exclusion Criteria:

• active smoking, chronic inflammatory diseases, infection

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Double

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Polyphenol; red grapes polyphenol supplementation on metabolic parameters in obese insulinoresistant subjects	Other: Supplementation with red grapes polyphenol
Placebo Comparator: Placebo; Placebo supplementation on metabolic parameters in obese insulinoresistant subjects	Other: Supplementation with red grapes polyphenol

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Measure of systemic insulin sensitivity (estimated by GIR :rate glucose infusion) measured by hyperinsulinemic-euglycemic clamp	GIR change after 8 weeks of supplementation	8 weeks after supplementation

Secondary Outcome Measures

Outcome Measure	Time Frame
Measure of insulin sensitivity to tissue (fat and muscle by measure ratio phosphoAKT/AKT measured by Western BLOT) before and after the supplementation	8 weeks after supplementation
Measure of systemic concentration (by Multiplex)	8 weeks after supplementation

Collaborators and Investigators

• Sponsor: University Hospital, Montpellier
• Collaborators: Institut National de la Santé Et de la Recherche Médicale, France
• Investigators: Principal Investigator: Ariane SULTAN, Pr, MD-PHD, Montpellier University Hospital

Study record dates

Study Major Dates

• Study Start (Actual): October 6, 2015
• Primary Completion (Actual): June 6, 2020
• Study Completion (Actual): June 6, 2020

Study Registration Dates

• First Submitted: December 9, 2015
• First Submitted That Met QC Criteria: December 16, 2015
• First Posted (Estimate): December 17, 2015

Study Record Updates

• Last Update Posted (Actual): December 21, 2021
• Last Update Submitted That Met QC Criteria: December 20, 2021
• Last Verified: December 1, 2021

More Information

Terms related to this study

• Keywords: Obesity; polyphenol; menopausal women; insulinoresistant
• Additional Relevant MeSH Terms: Glucose Metabolism Disorders; Metabolic Diseases; Hyperinsulinism; Insulin Resistance
• Other Study ID Numbers: 9501; 2014-A01627-40 (Registry Identifier: ID RCB)