Fat-Sensing Hormones Might Fight Obesity
Courtesy, Amanda Gardner: For now, the signal might keep you feeling full for a while. But, researchers are hoping that one day variations of this family of hormones — known as N-acylphosphatidylethanolamines, or NAPEs — can be used to control appetite and therefore obesity.
“We’re excited but we have to be cautious,” said Dr. Gerald Shulman, senior author of a study in rats that’s published in the Nov. 26 issue of the journal Cell. “We would love to be able to take this to man tomorrow because we need effective ways to treat obesity and, right now, we have very few agents that work effectively. But we have much work to do.”
Shulman is an investigator at the Howard Hughes Medical Institute and a professor of internal medicine and of cellular and molecular physiology at Yale University School of Medicine.
Shulman’s research team had been looking for a new, fat-derived signal that might regulate food intake. A sensitive blood-screening test — called LC tandem mass spectrometry — turned up the NAPE group of molecules.
Levels of NAPEs increased consistently in rats and mice that had just eaten a fatty meal. And when synthesized and re-injected into the lab rodents, NAPEs shut down the rodent’s food intake, with one dose lasting 12 hours or longer. NAPEs also entered the brain, appearing to concentrate in the hypothalamus, an area with a high concentration of neurons involved in the regulation of food intake, the researchers said.
Rats receiving NAPEs chronically (through a catheter in the jugular) ate less and lost weight.
“That’s what we have, a gut-derived fat that works centrally to inhibit food intake,” Shulman said.
Shulman and his colleagues believe that aberrations in how NAPEs are secreted in people who eat lots of high-fat foods may contribute to obesity. “Some of our animal data suggests that NAPE secretion is dysregulated in our animal models of diet-induced obesity,” Shulman said.
November 28th, 2008 at 7:04 pm
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