UCLA Scientists First to Track Joint Cartilage Development in Humans
Posted: December 12, 2013 at 4:46 pm
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Newswise Stem cell researchers from UCLAs Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research have published the first study to identify the origin cells and track the early development of human articular cartilage, providing what could be a new cell source and biological roadmap for therapies to repair cartilage defects and osteoarthritis. These revolutionary therapies could reach clinical trials within three years.
Led by Dr. Denis Evseenko, assistant professor of orthopedic surgery and head of UCLAs Laboratory of Connective Tissue Regeneration, the study was published online ahead of print in Stem Cell Reports on December 12, 2013.
Articular cartilage is a highly specialized tissue formed from cells called chondrocytes that protect the bones of joints from forces associated with load bearing and impact, and allows nearly frictionless motion between the articular surfaces. Cartilage injury and lack of cartilage regeneration often lead to osteoarthritis involving degradation of joints, including cartilage and bone. Osteoarthritis currently affects more than 20 million people in the United States alone, making joint surface restoration a major priority in modern medicine.
Different cell types have been studied with respect to their ability to generate articular cartilage. However, none of the current cell-based repair strategies including expanded articular chondrocytes or mesenchymal stromal cells from adult bone marrow, adipose tissue, sinovium or amniotic fluid have generated long-lasting articular cartilage tissue in the laboratory.
By bridging developmental biology and tissue engineering, Evseenkos discoveries represent a critical missing link providing scientists with checkpoints to tell if the cartilage cells (called chondrocytes) are developing correctly.
We began with three questions about cartilage development, Evseenko said, we wanted to know the key molecular mechanisms, the key cell populations, and the developmental stages in humans. We carefully studied how the chondrocytes developed, watching not only their genes, but other biological markers that will allow us to apply the system for the improvement of current stem cell-based therapeutic approaches.
This research was also the first attempt to generate all the key landmarks that allow generation of clinically relevant cell types for cartilage regeneration with the highest animal-free standards. This means that the process did not rely on any animal components, thus therapeutic products such as stem-cell serums can be produced that are safe for humans.
Evseenko added that in a living organism more than one cell type is responsible for the complete regeneration of tissue, so in addition to the studies involving generation of articular cartilage from human stem cells, he and his team are now trying different protocols using different combinations of adult progenitor cells present in the joint to regenerate cartilage until the best one is found for therapeutic use.
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UCLA Scientists First to Track Joint Cartilage Development in Humans
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