Repair of rat cartilage defect by human pluripotent stem cells-derived chondrocytes, courtesy of Aixin ChengFunded by Arthritis Research UK, Professor Sue Kimber and her Faculty team have developed a protocol to grow and transform embryonic stem cells into cartilage cells (also known as chrondrocytes). This could one day be used to treat osteoarthritis. Professor Kimber said:

“This work represents an important step forward in treating cartilage damage by using embryonic stem cells to form new tissue, although it’s still in its early experimental stages.”

During the study, the team analysed the ability of embryonic stems cells to become precursor cartilage cells. They were then implanted into cartilage defects in the knee joints of rats.

After four weeks, cartilage was partially repaired. Eight weeks after that a smooth surface resembling normal cartilage was observed. Further study showed that cells from the embryonic stem cells were still present and active within the tissue.
Despite the fact that this still needs to be tested on humans, researchers see this as an extremely promising outcome. Not only did this protocol generate new, healthy-looking cartilage but there were also no signs of any side-effects. Further work will hope to demonstrate that this could be a safe and effective treatment for people with joint damage. Prof Kimber added:

“We’ve shown that the protocol we’ve developed has strong potential for developing large numbers of chondrogenic cells appropriate for clinical use. These results thus mark an important step forward in supporting further development towards clinical translation.”

Osteoarthritis affects more than eight million people in the UK, and is a major cause of disability. It occurs when cartilage at the ends of bones wears away and it causes joint pain and stiffness. Dr Stephen Simpson, Director of Research at Arthritis Research UK, said:

“Current treatments of osteoarthritis are restricted to relieving painful symptoms, with no effective therapies to delay or reverse cartilage degeneration. Joint replacements are successful in older patients but not young people, or athletes who’ve suffered a sports injury. Embryonic stem cells offer an alternative source of cartilage cells to adult stem cells, and we’re excited about the immense potential of Professor Kimber’s work and the impact it could have for people with osteoarthritis.”

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