To regulate weight gain, control inflammation?

Disabling a gene in specific cells prevented mice from becoming obese even after they ate a high-fat diet, a study on inflammation and weight gain shows.

They blocked the activity of a gene in immune cells. Because these immune cells—called macrophages—are key inflammatory cells and because obesity associates with chronic low-grade inflammation, the researchers believe that reducing inflammation may help regulate weight gain and obesity.

“We’ve developed a proof of concept here that you can regulate weight gain by modulating the activity of these inflammatory cells,” says principal investigator Steven L. Teitelbaum, professor of pathology & immunology at Washington University in St. Louis.

“It might work in a number of ways, but we believe it may be possible to control obesity and the complications of obesity by better regulating inflammation.”

When people are obese, they burn fewer calories than those who are not obese. The same is true for mice.

But, the researchers found that obese mice maintained the same level of calorie burning as mice that were not obese—after the research team deleted the ASXL2 gene in the macrophages of the obese mice and, in a second set of experiments, after they injected the animals with nanoparticles that interfere with the gene’s activity, according to co-first author Wei Zou, assistant professor of pathology and immunology.

Despite high-fat diets, the treated animals burned 45% more calories than their obese littermates with a functioning gene in macrophages.

The researchers don’t know exactly why this prevented obesity in the mice. Co-first author Nidhi Rohatgi, instructor in pathology, says it appears to involve getting white fat cells—which store the fat that makes us obese—to behave more like brown fat cells—which help to burn stored fat.

The strategy is a long way from becoming a therapy, but it has the potential to help obese people burn fat at rates similar to rates seen in lean people.

“A large percentage of Americans now have fatty livers, and one reason is that their fat depots cannot take up the fat they eat, so it has to go someplace else,” Teitelbaum says.

“These mice consumed high-fat diets, but they didn’t get fatty livers. They don’t get type 2 diabetes. It seems that limiting the inflammatory effects of their macrophages allows them to burn more fat, which keeps them leaner and healthier.”

The study appears in the Journal of Clinical Investigation.

The National Heart, Lung and Blood Institute; the National Institute of Arthritis and Musculoskeletal and Skin Diseases; the National Institute of Diabetes and Digestive and Kidney Diseases; the National Institute of Allergy and Infectious Diseases and the National Institute of Biomedical Imaging and Bioengineering of the National Institutes of Health supported the work.

Source: Washington University in St. Louis

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