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Scientists Use Stem Cells to Help Rabbits Grow New Joints
Date:7/29/2010

joint.

The beauty of the technique, according to Mao, is that, "we didn't have to take stem cells out of the body and put them back in. This was all regeneration by endogenous [the body's own] stem cells."

New joints in place, the animals resumed normal, rabbit-like function within three to four weeks, the authors reported.

This was the first time that endogenous stem cells have been used for such a project, rather than stem cells that are first taken out of the body and treated before being put back in.

"This is one of the important ways people are looking at endogenous stem cells, inducing stem cells to migrate to the damaged tissue," said Paul Sanberg, a stem cell expert and distinguished professor of neurosurgery and director of the University of South Florida Center of Excellence for Aging and Brain Repair in Tampa. "This area is becoming very important to harness the power of stem cells but it's still early in research."

The authors are now starting preclinical trials in large animals, in the hopes that this will lead to eventual clinical trials in humans.

However, fashioning similar joints in humans will require more work, according to Patrick Warnke, head of the multinational tissue engineering project MyJoint, and author of the Comment accompanying the study. According to Warnke, elderly humans, especially those with other conditions such as diabetes, may not be able to regenerate tissue as fast as the rabbits did and may end up bedridden for weeks or months.

This method, if proven in more studies, might be a more feasible option in younger people, wrote Warnke, who is also a professor in the faculty of health sciences and medicine at Bond University, Gold Coast, Australia.

But Mao remained optimistic.

"The pathway is clear but the timing [of actually performing these procedures in the clinic] is hard to predict," he said, adding that it is also "hard to predict the regulatory process at the FDA [U
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