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'Exercise pill' switches on gene that tells cells to burn fat

the genetic metabolic engineering that created the marathon mouse is permanent, turned on before birth. While a dramatic proof of concept that metabolic engineering is a potentially viable approach, it offers no help to an adult whose muscles are already formed and who now would benefit greatly from having more active, fat-burning muscles.

That is why the potential of chemical metabolic engineering - possibly a one-a-day pill as opposed to permanent genetic metabolic engineering - is so exciting, says Dr. Evans. In today’s society, too few people get an ideal amount of exercise, some because of medical problems or excess weight that makes exercise difficult. Having access to an "exercise pill" would improve the quality of muscles, since muscles like to be exercised, and increase the burning of energy or excess fat in the body. And that would result in less fatty tissue, lower amounts of fat circulating in the blood, lower blood glucose levels and less resistance to insulin, lowering the risks of heart disease and diabetes.

The ability to chemically engineer changes in metabolism also has given the researchers more insight into how the PPAR-d switch works, says Dr. Evans. Genetically engineering changes in metabolism in the marathon mice triggers both increased fat burning and increased endurance. Adult normal mice that receive the drug to switch on PPAR-d show increased fat burning and resistance to weight gain, but they do not show increased endurance. Dr. Evans says this suggests the delta switch can operate in different modes, and the laboratory is in the process of figuring out exactly how. He hopes his strategy will make it possible.
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Source:Federation of American Societies for Experimental Biology


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