Immunohistochemical study on the distribution of telocytes in the knee joint components in a rat osteoarthritis model.
Ikufumi Takahashi, Taro Matsuzaki, Masahiro Hoso
PMID 35937624WHAT IT FOUND
In a rat model of knee osteoarthritis, cells presumed to be telocytes were found in the infrapatellar fat pad and fibrous connective tissue, but not in cartilage or ligaments.
Osteoarthritis did not change the area occupied by these cells. This is basic anatomy in animals and does not yet inform human therapy.
Key findings
01CD34-positive and CD31-negative areas were observed in the infrapatellar fat pad and fibrous connective tissue, but not in the articular cartilage, subchondral bone, cruciate ligament, or lateral meniscus.
02The area ratio of these presumed telocytes did not differ significantly between the control and osteoarthritis groups, suggesting osteoarthritis did not affect telocyte amounts.
STILL TO COME
How it was doneWhat they found
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What it does not show
The study was conducted in rats, so findings may not apply to human knee anatomy or osteoarthritis. Telocytes were identified only by immunohistochemical staining (CD34+/CD31-), without confirmation by electron microscopy or fluorescent methods. The synovium and joint capsule could not be adequately observed in many specimens due to the sectioning plane used. The infrapatellar fat pad was missing from about half of the samples. The study only looked at two time points (2 and 8 weeks), potentially missing early inflammatory changes.
Declared interests
Supported by a JSPS KAKENHI grant-in-aid for Early Career Scientists. Authors declared no competing interests.
The easy way to misread this
Do not assume this study provides evidence about telocytes in human osteoarthritis or that telocyte loss contributes to the disease. The work is in rats, and the primary finding was that telocyte-presumed areas did not change with osteoarthritis progression.