Millimeter wave treatment inhibits NO-induced apoptosis of chondrocytes through the p38MAPK pathway

In the present study, we investigated the effects of millimeter wave treatment on the activation of the p38MAPK signaling pathway in the process of NO-induced apoptosis in chondrocytes. Cartilage was isolated from the knee joint of SD rats and used to establish cultured primary chondrocytes. After identification using in situ staining of type II collagen, the passage 2 chondrocytes were incubated with or without sodium nitroprussiate (SNP) to induce apoptosis and treated with a millimeter wave for various times. The apoptosis of chondrocytes was detected using immunofluorescence, an MTT assay, and Annexin V-FITC labeling followed by fluorescence-activated cell sorting (FACS). The activity of caspase-3 was measured using colorimeters, and the levels of p38 and p53 were also detected using RT-PCR and Western blotting. After treatment with SNP, the OD values of the experimental groups were significantly lower than the control group (P