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Turning on adult stem cells may help repair bone
Date:1/25/2008

The use of a drug to activate stem cells that differentiate into bone appears to cause regeneration of bone tissue and be may be a potential treatment strategy for osteoporosis, according to a report in the February 2008 Journal of Clinical Investigation. The study led by researchers from Massachusetts General Hospital (MGH) and the Harvard Stem Cell Institute (HSCI) found that treatment with a medication used to treat bone marrow cancer improved bone density in a mouse model of osteoporosis, apparently through its effect on the mesenchymal stem cells (MSCs) that differentiate into several types of tissues.

Stem cell therapies are often thought of as putting new cells into the body, but this study suggests that medications can turn on existing stem cells that reside in the bodys tissues, acting as regenerative medicines to enhance the bodys own repair mechanisms, says David Scadden, MD, director of the MGH Center for Regenerative Medicine and HSCI co-director. Drugs that direct immature cells to become a particular cell type, like in this study, could potentially be very useful.

The study was designed to examine whether the drug bortezamib (Bzb), which can alleviate bone destruction associated with the cancer multiple myeloma, could also regenerate bone damaged by non-cancerous conditions. In their first experiments, the researchers showed that treating mice with Bzb increased several factors associated with bone formation. Similar results were seen when cultured MSCs were treated with Bzb, but not when the drug was applied to cells that were committed to become particular cell types. Found in the bone marrow, MSCs have the potential to develop into the bone-building osteoblasts and several other types of cells including cartilage, fat, skin and muscle.

Subsequent experiments supported the hypothesis that Bzb increases osteoblast activity and bone formation by acting on MSCs but not on more differentiated osteoblast precur
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Contact: Sue McGreevey
smcgreevey@partners.org
617-724-2764
Massachusetts General Hospital
Source:Eurekalert

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