The NIH researchers studied children and adults with WAGR syndrome, a rare genetic condition. The researchers found that some of the people with this syndrome lack a gene for BDNF and have correspondingly low blood levels of the substance. The people in this subgroup also have unusually large appetites and a strong tendency towards obesity.
"This is a promising new lead in the search for biological pathways that contribute to obesity," said Duane Alexander, M.D., director of the NIH's Eunice Kennedy Shriver National Institute of Child Health and Human Development. "This finding may eventually lead to the development of new drugs to regulate appetite in people who have not had success with other treatments."
...Dr. Yanovski explained that BDNF is believed to work in combination with a variety of other substances that regulate appetite and body weight. Chief among these is leptin, a hormone found to be involved in signaling hunger. Dr. Yanovski added that release of BDNF in the hypothalamus, a part of the brain involved in controlling eating, is believed to be indirectly triggered by leptin. Studies of the relationship between the two, and of BDNF's action on tissues, may lead to the development of new drugs to treat obesity in some individuals.
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Low levels of brain chemical may lead to obesity, NIH study of rare disorder shows