(-)-Epicatechin improves insulin sensitivity in high fat diet-fed mice

Area of Science:

• Metabolic research
• Nutritional science
• Endocrinology

Background:

• Obesity is a significant public health issue linked to type 2 diabetes (T2D).
• (-)-Epicatechin (EC), a flavanol, shows potential in improving insulin sensitivity.
• Dietary strategies to combat obesity-associated insulin resistance are needed.

Purpose of the Study:

• To investigate if EC supplementation can prevent high-fat diet (HFD)-induced insulin resistance in mice.
• To elucidate the mechanisms by which EC affects insulin signaling pathways.
• To assess EC's impact on obesity and glucose metabolism.

Main Methods:

• Mice were fed a HFD for 15 weeks to induce obesity and insulin resistance.
• EC supplementation was administered to assess its preventative effects.
• Insulin signaling cascade components and negative modulators were evaluated in adipose and liver tissues.
• Insulin tolerance tests (ITT) and glucose tolerance tests (GTT) were performed.

Main Results:

• HFD induced obesity and insulin resistance, confirmed by elevated glucose/insulin levels and impaired ITT/GTT.
• Alterations in insulin signaling (insulin receptor, IRS1, ERK1/2, Akt) were observed in HFD-fed mice.
• EC supplementation prevented/ameliorated HFD-induced obesity and insulin resistance.
• EC downregulated inhibitory molecules (JNK, IKK, PKC, PTP1B), enhancing insulin sensitivity.

Conclusions:

• (-)-Epicatechin (EC) supplementation effectively prevents HFD-induced obesity and insulin resistance in mice.
• EC improves insulin sensitivity, partly by downregulating negative insulin signaling modulators.
• Consumption of EC-rich foods may serve as a dietary intervention for obesity-associated insulin resistance.