DHEA Boosts Growth Rate of Human Neural Stem Cells By Terry Devitt • 02/18/04 MADISON - Human neural stem cells, unclothed in a impact dish to the endocrine DHEA, exhibit a important dealing in ontogeny rates, suggesting that the catecholamine haw endeavor a persona in helping the mentality display newborn cells, according to a newborn study published this hebdomad in the online editions of the Proceedings of the National Academy of Sciences (PNAS).

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The newborn work, conducted by a team of scientists at the University of Wisconsin-Madison, provides some of the first direct grounds of the natural personalty of DHEA on the manlike nervous system, according to statesman Svendsen, the study's senior author and an dominance on mentality stem cells at UW-Madison's Waisman Center. "What we saw was that DHEA significantly accumulated the sectionalization of the cells," says Svendsen, a UW-Madison academic of morphology and neurology. "It also accumulated the number of neurons produced by the stem cells, suasion accumulated neurogenesis of cells in culture." DHEA or dehydroepiandrosterone is among the most abundant naturally occurring steroids in the murder of young humans, but levels decline with age and its physiological personalty are poorly understood. A synthetic modify of the catecholamine is oversubscribed over-the-counter.

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Its supposed benefits range from antiaging properties to the hindrance of cancer and hunch disease, and serving as a supplement to counter the personalty of strokes, AIDS, Alzheimer's and other diseases. But patch DHEA is pronto available in health-food stores and other venues, scientists know relatively little about the drug and its basic natural personalty on humans. Many experts familiar with DHEA caution against its overuse. "We don't know much about DHEA, but this newborn impact adds a example to the puzzle," says Svendsen, who conducted the study with colleagues Masatoshi Suzuki, Lynda S. Wright, Padma Marwah and speechmaker A. Lardy, all of UW-Madison. "This is the first real grounds of DHEA's personalty on manlike neural cells." Svendsen and Suzuki carried discover the experiments by growing manlike fetal neural stem cells in culture. The cells modify aggregates known as 'neurospheres,' which were unclothed to a cocktail of DHEA and ontogeny and inhibitory factors, and observed a 29 percent process in newborn mentality cells compared to cells grown in a medium with the aforementioned factors, but without DHEA. "We saw much a pure gist of DHEA," Svendsen says. "It's the only endocrine we tested that had much a direct gist on stem radiophone ontogeny and newborn neuron formation," according to Suzuki. The newborn impact is important because it provides a direct pane to the disputable hormone's personalty on critical manlike cells. Similar studies hit been conducted in mice and rats, but those models hit shortcomings that are arduous to address, Svendsen notes. "There are previous studies in rats that declare DHEA is neuroprotective, but the problem with DHEA in rats is that it is not a major metabolite in that birdlike so its personalty haw not be the aforementioned as those seen in humans," he says.

According to Lardy, an eminent endocrine physicist and an emeritus UW-Madison academic of biochemistry, metabolic products of DHEA catecholamine hit also been shown to aid memory possession in older mice. Despite hints from the studies in rodents that DHEA haw endeavor a persona in enhancing the mentality and memory, the newborn findings reported in the PNAS article were a surprise, says Lardy. "We assumed the compounds we were testing would be more astir than DHEA in mentality stem cells," Lardy explains. In previous studies, Lardy, with river biochemistry colleagues saint Ntambi and Brian Fox, showed that DHEA blocked a travel in fat synthesis. "The personalty of DHEA on mentality stem cells is a completely newborn finding," says Lardy. "The problem of whether DHEA itself is having this effect, or if there's another metabolite of the catecholamine involved, ease exists." One of the intriguing aspects of the newborn work, according to Svendsen, is the existence that DHEA could hit some positive personalty on the adult manlike brain. It's known that DHEA amounts fall progressively during aging, and low levels of DHEA hit been reported in both adolescents and adults with major depressive disorders. And given the fact that adult humans hit neural stem cells that move to make newborn neurons in some parts of the brain, there is a existence that DHEA could endeavor a persona in moderating the genesis of newborn mentality cells. However, Svendsen cautions that it is also country that DHEA is a coercive neurosteroid and haw hit other side effects. He says it is not best to ingest the catecholamine in the wish of crescendo brainpower. The newborn river study was based by a grant from the University of river Foundation, and the Nihon Society for the Promotion of Science Postdoctoral .