This Cell Fat Discovery Could Ease Inflammation and Complications For Diabetics

This Cell Fat Discovery Could Ease Inflammation and Complications For Diabetics

Inflammation is one of the main reasons why people with diabetes experience heart attacks, strokes, kidney problems, and other, related complications. Now a surprise finding identifies a possible trigger of chronic inflammation.

Too much fat in the diet promotes insulin resistance by spurring chronic inflammation. But the researchers discovered, in mice, that when certain immune cells can’t manufacture fat, the mice don’t develop diabetes and inflammation, even when consuming a high-fat diet.

“The number of people with diabetes has quadrupled worldwide over the last 20 years,” says senior investigator Clay F. Semenkovich, professor and director of the division of endocrinology, metabolism, and lipid research at the Washington University School of Medicine in St. Louis.

“We have made modest progress in making it less likely for some people with diabetes to have heart attacks and strokes. However, those receiving optimal therapy are still much more likely to die from complications driven by chronic inflammation that is, at least in part, generated by these immune cells.

“But by blocking the production of fat inside these cells, it may be possible to prevent inflammation in people with diabetes and even in other conditions, such as arthritis and cancer, in which chronic inflammation plays a role. This could have a profound impact on health.”

Semenkovich’s team made genetically altered mice that could not make the enzyme for fatty acid synthase (FAS) in immune cells called macrophages. Without the enzyme, it was impossible for the mice to synthesize fatty acids, a normal part of cell metabolism.

“We were surprised to find that the mice were protected from diet-induced diabetes,” says Xiaochao Wei, an instructor of medicine and first author of the study in Nature. “They did not develop the insulin resistance and diabetes that normally would have been induced by a high-fat diet.”

Through a series of experiments in the animals and in cell cultures, the researchers found that if macrophages could not synthesize fat from within, the external membranes of those cells could not respond to fat from outside the cells. That prevented the cells from contributing to inflammation.

But eliminating inflammation altogether is not the answer to preventing diabetic complications because inflammation is also vital for clearing infectious pathogens from the body and helps wounds heal. Still, Semenkovich says the new findings may have profound clinical implications.

“An inhibitor of fatty acid synthase actually is now in clinical trials as a potential cancer treatment,” he explains. “And other drugs have been developed to inhibit fatty acid synthase in diabetes, too. One possibility that our work suggests is that altering the lipid content in the cell membrane may help block cancer metastases and complications of diabetes.”

Drugs currently in use to block fatty acid synthase, as well as other developing strategies, potentially could allow for chronic inflammation to be blocked, without completely eliminating the ability of macrophages to fight infection.

The researchers also plan to take a look at existing drug compounds that change the lipid composition in cells. Such medications failed in clinical trials, but they may have an effect on the membranes of macrophages and therefore may lower the risk of diabetes complications, Semenkovich says.

Funding came from the National Institute of Diabetes and Digestive and Kidney Diseases; the National Heart, Lung, and Blood Institute; and the National Center for Research Resources of the National Institutes of Health, as well as the Taylor Family Institute for Innovative Psychiatric Research.

Source: Washington University in St. Louis

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