There's good fat and bad fat in our bodies. The good fat helps burn calories, while the bad fat hoards calories, contributing to weight gain and obesity. Now, new research has identified a way to convert bad, white fat into good, brown fat, at least in mice. The study is published in the journal Cell Reports.
White fat stores calories and pads our bellies, hips and thighs. In contrast, brown fat, found near our necks and shoulders, burns calories through a process that generates heat.
The researchers found that blocking the activity of a specific protein in white fat triggered the fat to begin to brown into beige fat, a type of fat in between white and brown. Blocking the protein to create beige fat caused the fat cells to heat up and burn calories.
"Our goal is to find a way to treat or prevent obesity," said first author. "Our research suggests that by targeting a protein in white fat, we can convert bad fat into a type of fat that fights obesity."
Beige fat was discovered in adult humans in 2015. Though it is almost like an intermediary between white fat and brown fat, the author said it functions more like brown fat and can protect against obesity.
The team conducted a series of experiments in mice, creating a genetic strain of animals that didn't make a key protein in their white fat cells. Those mice had more beige fat and were leaner than their littermates, even when they ate the same amount of food as other mice. They also burned more calories.
"Mice normally have very low levels of the protein, called PexRAP, in their brown fat,"the author said. "When we put the mice into a cold environment, levels of the protein also decreased in white fat, allowing that fat to behave more like brown fat. Cold induces brown and beige fats to burn stored energy and produce heat."
When the team blocked PexRAP in the animals, the mice converted white fat into beige fat that could burn calories.
Authors also show that PexRAP interacts with importin-β1, a nuclear import factor, and knockdown of PexRAP in adipocytes reduced the levels of nuclear phospholipids. PexRAP also interacts with PPARγ, as well as PRDM16, a critical transcriptional regulator of thermogenesis, and disrupts the PRDM16-PPARγ complex, providing a potential mechanism for PexRAP-mediated inhibition of adipocyte browning.
More than two-thirds of adults in the United States are either overweight or obese. Some 30 million people have diabetes. These findings study suggest that if therapies could help convert their bad fat into good fat, those numbers might start to decline.
The author said if the PexRAP protein could be blocked safely in white fat cells in humans, people might have an easier time losing weight.
"The challenge will be finding safe ways to do that without causing a person to overheat or develop a fever, but drug developers now have a good target" the author said.
https://medicine.wustl.edu/news/scientists-find-way-convert-bad-body-fat-good-fat/
http://www.cell.com/cell-reports/fulltext/S2211-1247(17)31219-6
Converting bad body fat into good fat
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