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New Type of Drug Builds Bone -- and More

Safer Kind of Estrogen May Help Women and Men
WebMD Health News

Oct. 24, 2002 -- An estrogen-like drug reverses bone loss without estrogen's side effects. The startling discovery promises novel treatments for age-related bone loss, heart disease, and even Alzheimer's disease.

This makes Stavros Manolagas, MD, PhD, one happy scientist. His theories -- once scoffed at -- have opened the floodgates to what promises to be a stream of new drugs for a wide variety of conditions.

Manolagas is director of the Osteoporosis and Metabolic Bone Diseases Center in Little Rock, Ark., funded by the Veterans Administration and the University of Arkansas. For years, he's suggested that the sexual -- and sometimes cancer-promoting -- effects of the female sex hormone estrogen can be separated from its healthy effects on bone, heart, and brain.

"It's not just me -- lots of people for the last 40 years have talked about this, but nobody listened," Manolagas tells WebMD. "There was no evidence until we came upon these striking effects in bone cells. Even after we reported these findings last year, a lot of people weren't convinced."

The world now is taking notice. In the Oct. 25 issue of Science, Manolagas and colleagues report that a new type of drug -- dubbed estren -- rebuilds bone in mice. In fact, it worked even better than estrogen in female mice. Amazingly, it also worked in male mice. And the drug had no effect on sex organs.

"What we are trying to do is keep the beneficial effects of estrogen while eliminating the side effects," Manolagas says. "If we have the bone, heart, and brain protection of hormones without hormone side effects, we can have our cake and eat it, too. This is proof in an animal that not only do these activities exist, but that the synthetic compound can have superior biological effects to the natural hormone."

Jill Carrington, PhD, of the National Institute of Aging's biology of aging program, says the findings may one day lead to treatments for many age-related problems.

"This really points out a new direction to follow in order to develop treatments for osteoporosis -- and it may have broader implications than that," Carrington tells WebMD. "Particularly in light of the questions now being asked about current hormone-replacement therapies, this is very important."

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