Anti-inflammatory mechanism of dieting and fasting revealed

Anti-inflammatory mechanism of dieting and fasting revealed

Researchers at Yale School of Medicine have found that a compound produced by the body when dieting or fasting can block a part of the immune system involved in several inflammatory disorders such as type 2 diabetes, atherosclerosis, and Alzheimer’s disease.

In their study, published in the Feb. 16 online issue of Nature Medicine, the researchers described how the compound ?-hydroxybutyrate (BHB) directly inhibits NLRP3, which is part of a complex set of proteins called the inflammasome. The inflammasome drives the inflammatory response in several disorders adding a utoimmune diseases, type 2 diabetes, Alzheimer’s disease, atherosclerosis, and autoinflammatory disorders.

“These findings are important because endogenous metabolites like BHB that block the NLRP3 inflammasome could be relevant against many inflammatory diseases, including those where there are mutations in the NLRP3 genes,” said Vishwa Deep Dixit, professor in the Section of Comparative Medicine at Yale School of Medicine.

BHB is a metabolite produced by the body in response to fasting, high-intensity exercise, caloric restriction, or consumption of the low-carbohydrate ketogenic diet. Dixit said it is well known that fasting and calorie restriction reduces inflammation in the body, but it was unclear how immune cells adapt to reduced availability of glucose and if they can respond to metabolites produced from fat oxidation.

Working with mice and human immune cells, Dixit and colleagues focused on how macrophages — specialized immune cells that produce inflammation — respond when exposed to ketone bodies and whether that impacts the inflammasone complex.

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The team introduced BHB to mouse models of inflammatory diseases caused by NLP3. They found that this reduced inflammation, and that inflammation was also reduced when the mice were given a ketogenic diet, which elevates the levels of BHB in the bloodstream.

“Our results suggest that the endogenous metabolites like BHB that are produced during low-carb dieting, fasting, or high-intensity exercise can lower the NLRP3 inflammasome,” said Dixit.

Other authors on the study include Yun-Hee Youm, Kim Y. Nguyen, Ryan W Grant, Emily L. Goldberg, Monica Bodogai, Dongin Kim, Dominic D’Agostino, Noah Planavsky, Christopher Lupfer, Thirumala D Kanneganti, Seokwon Kang, Tamas L. Horvath, Tarek M. Fahmy, Peter A. Crawford, Arya Biragyn, and Emad Alnemri.

The research was funded in part by National Institutes of Health grants AI105097, AGO43608, AG031797, and DK090556.

Story Source:

The above story is based on materials provided by Yale University. The original article was written by Karen N. Peart. Note: Materials may be edited for content and length.

Original story here.
Diet And Weight Loss News — Sciencedaily
— Courtesy “Science News Daily” (ScienceNewsDaily.com)

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