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Hormone promises to keep joint injuries from causing long-term osteoarthritis
Date:9/12/2009

s from undergoing maturation, and stimulates their proliferation, preserving larger pools of cartilage cells in the joint. Signaling molecules like PTH have their effect in the body by interacting with specifically shaped proteins on the cell surfaces called receptors. PTH docks into its receptors, like a ship coming into port, which changes the shape of the dock such that biochemical signals are sent.

The authors of the current study observed that chondrocytes within injured and degenerating cartilage have more PTH type 1 receptors on their surfaces. This makes them especially sensitive to the PTH signal that prevents harmful chondrocyte maturation into bone in the joint cartilage. Thus, PTH therapy should increase the cartilage supply exactly where cartilage loss is causing disease.

"Right now physicians have no way to bring back cartilage in patients who have lost it to osteoarthritis," said Randy Rosier, M.D., Ph.D., professor within the Department of Orthopaedics and Rehabilitation at the University of Rochester Medical Center. "Our current results, at least in mice, show that we can inhibit cartilage degeneration and improve the volume of cartilage in diseased joints. It's remarkable enough that this compound delays the loss of cartilage, but these results show it also may be able to restore, at least to some extent, cartilage in already degraded joint surfaces."

Researchers examined the impact of a daily dose of Forteo/teriparatide, manufactured by Eli Lilly, and a generic version of teriparatide made by Sigma on the progress of OA following injury in study mice.

Experiments established a five-fold increase in PTH type 1 receptor expression in the articular cartilage of mice with injury-related osteoarthritis when compared to healthy cartilage. Injury triggers genetic mechanisms in an attempt to begin repairs, a repair response that may be responsible for the increase in PTH receptor in the joint. This in turn makes
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Contact: Greg Williams
Greg_Williams@urmc.rochester.edu
585-273-1757
University of Rochester Medical Center
Source:Eurekalert

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