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Measles virus plays role in Paget's disease of bone, Pitt-led team says
Date:1/14/2011

PITTSBURGH, Jan. 14 A gene from the measles virus plays a key role in the development of Paget's disease of bone, according to a team of researchers led by the University of Pittsburgh School of Medicine. Their findings, recently published in Cell Metabolism, confirm a long-held speculation that the childhood infection is an environmental trigger for the disease and reveal how the viral gene contributes to the development of its characteristic bone lesions.

"Our earlier work showed that bone cells called osteoclasts in about 70 percent of these patients contain a certain measles virus protein," noted senior investigator, G. David Roodman, M.D., Ph.D., professor and vice chair for research, Department of Medicine. "Also, when we engineered normal osteoclasts in mice to contain, or express, the measles protein, pagetic bone lesions formed."

Osteoclast abnormalities lead to imbalance in the normal processes of bone dissolution and rebuilding. According to the National Institute of Arthritis and Musculoskeletal and Skin Diseases, an estimated 1 million Americans have Paget's disease (PD) of bone. Bones are enlarged but fragile, leading to pain and a greater likelihood of fracture. Arthritis, hearing loss and kidney stones can occur.

In the new study, Dr. Roodman's team sought to understand the roles of mutations in a gene called p62, which is common among PD patients, and measles virus nucleocapsid protein (MVNP) by examining the marrow of affected and unaffected bones of 12 PD patients and of eight people without PD. They also bred mice with the p62 mutation and MVNP.

The team found that marrow from eight of the 12 PD patients expressed MVNP; three patients expressed the protein in both affected and unaffected bone sites, and four patients did not make it at either type of site. Osteoclast precursor cells from PD patients who made MVNP formed pagetic osteoclasts in test tube experiments and displayed other typical PD res
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Contact: Anita Srikameswaran
SrikamAV@upmc.edu
412-578-9193
University of Pittsburgh Schools of the Health Sciences
Source:Eurekalert

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