Study Reveals Protein Key to Converting White Fat into Calorie-Burning Beige Fat

UCSF researchers have published a study in the Journal of Clinical Investigation that demonstrates that ordinary white fat cells can be transformed into calorie-burning beige fat cells by suppressing a single protein called KLF-15.

Brian Feldman, senior author of the study, explains, "A lot of people thought this wasn't feasible. We showed not only that this approach works to turn these white fat cells into beige ones, but also that the bar to doing so isn't as high as we'd thought."

The research team found that KLF-15 is less abundant in white fat cells compared to brown or beige fat cells. By breeding mice with white fat cells lacking KLF-15, they observed a conversion from white to beige fat. Further investigation revealed that KLF-15 controls the abundance of a receptor called Adrb1, which helps maintain energy balance.

This discovery could lead to the development of new weight-loss drugs targeting the Adrb1 receptor in humans. Such an approach might avoid side effects like nausea associated with current injectable weight-loss drugs, as its activity would be limited to fat deposits rather than affecting the brain.

"We're certainly not at the finish line, but we're close enough that you can clearly see how these discoveries could have a big impact on treating obesity," Feldman stated. The study also sheds light on why previous clinical trials targeting a related receptor, Adrb3, have been unsuccessful in humans. This new understanding of fat cell conversion mechanisms opens up promising avenues for more effective obesity treatments in the future.