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Báo cáo y học: "Calcium deposition in osteoarthritic meniscus and meniscal cell culture"

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học General Psychiatry cung cấp cho các bạn kiến thức về ngành y đề tài: Calcium deposition in osteoarthritic meniscus and meniscal cell culture. | Sun et al. Arthritis Research Therapy 2010 12 R56 http arthritis-research.eom content 12 2 R56 RESEARCH ARTICLE Open Access Calcium deposition in osteoarthritic meniscus and meniscal cell culture Yubo Sun 1 David R Mauerhan1 Patrick R Honeycutt1 Jeffrey S Kneisl1 H James Norton2 Natalia Zinchenko1 Edward N Hanley Jr1 and Helen E Gruber1 Abstract Introduction Calcium crystals exist in the knee joint fluid of up to 65 of osteoarthritis OA patients and the presence of these calcium crystals correlates with the radiographic evidence of hyaline cartilaginous degeneration. This study sought to examine calcium deposition in OA meniscus and to investigate OA meniscal cell-mediated calcium deposition. The hypothesis was that OA meniscal cells may play a role in pathological meniscal calcification. Methods Studies were approved by our human subjects Institutional Review Board. Menisci were collected during joint replacement surgeries for OA patients and during limb amputation surgeries for osteosarcoma patients. Calcium deposits in menisci were examined by alizarin red staining. Expression of genes involved in biomineralization in OA meniscal cells was examined by microarray and real-time RT-PCR. Cell-mediated calcium deposition in monolayer culture of meniscal cells was examined using an ATP-induced 45calcium deposition assay. Results Calcium depositions were detected in OA menisci but not in normal menisci. The expression of several genes involved in biomineralization including ENPP1 and ANKH was upregulated in OA meniscal cells. Consistently ATP-induced calcium deposition in the monolayer culture of OA meniscal cells was much higher than that in the monolayer culture of control meniscal cells. Conclusions Calcium deposition is common in OA menisci. OA meniscal cells calcify more readily than normal meniscal cells. Pathological meniscal calcification which may alter the biomechanical properties of the knee meniscus is potentially an important contributory factor to OA. .