In vitro effects of sodium hyaluronate on the proliferation and the apoptosis in chondrocytes from patients with Kashin-Beck disease and osteoarthritis

Objective:To identify the in vitro effects of sodium hyaluronate(HA) on the proliferation and the apoptosis of chondrocytes from patients with Kashin-Beck disease(KBD) and osteoarthritis(OA). Methods:Samples of articular cartilages from KBD and OA patients, as well as healthy volunteers(6 subjects in each of the 3 groups) were dissected, digested with collagenase and the cells cultured in monolayers. Chondrocytes from each sample were assigned to an untreated group and two HA-treated groups: H0(no HA), H100(HA, 0.1 g/L) and H500(HA, 0.5 g/L). The first passage chondrocytes were used to observe proliferation using the MTT assay, and apoptosis by flow cytometry through Annexin V/PI staining. Results:HA promoted proliferation of chondrocytes in all the three groups, and in KBD and OA groups, for cells cultured for 4 and 6 days, H500 significantly promoted the cell proliferation. The apoptotic rates of both KBD and OA group chondrocytes were in the order H500 < HA100 < H0. Conclusion:Sodium hyaluronate administration has a dose-dependent in vitro effect to promote proliferation and inhibit apoptosis of chondrocytes from patients with KBD and OA.

Hyaluronic acid inhibited the upregulation of heat-shock protein 70 in human chondrocytes from osteoarthritis and Kashin-Beck disease

This study aimed to investigate the effect of hyaluronic acid(HA)on the expression of heat-shock protein 70(HSP70)in chondrocytes isolated from patients with osteoarthritis(OA)and Kashin-Beck disease(KBD).The chondrocytes were collected from OA and KBD patients,and chondrocytes isolated from patients of accident injuries were used as the control.The chondrocytes were treated with HA at different doses.HSP70 expression in chondrocytes at both mRNA and protein levels was tested by PCR and Western blot analysis.Compared with control,both mRNA and protein levels of HSP70 were higher in chondrocytes from KBD and OA.However,HA at the dose of 500μg/mL significantly inhibited HSP70 expression levels in both KBD and OA groups(P<0.05).In conclusion,HSP70 is highly expressed in chondrocytes of patients of OA and KBD.HA intervention inhibits the upregulation of HSP70 in chondrocytes of OA and KBD patients and could be a promising agent for treatment of OA and KBD.