RESUMEN
OBJECTIVE: To explore the role of epithelial sodium channel (ENaC) in regulating the functional activity of osteoclasts. METHODS: Multinucleated osteoclasts were obtained by inducing the differentiation of rat bone marrow cells with macrophage colony-stimulating factor (M-CSF) and RANKL. The osteoclasts were exposed to different concentrations of the ENaC inhibitor amiloride, and the expression of ENaC on osteoclasts was examined using immunofluorescence technique. The osteoclasts were identified with tartrate-resistant acid phosphatase (TRAP) staining, and the positive cells were incubated with fresh bovine femoral bone slices and the number of bone absorption pits was counted by computer-aided image processing. RT-PCR was performed to analyze the expression of cathepsin K in the osteoclasts. RESULTS: s Exposure to different concentrations of amiloride significantly inhibited the expression of ENaC and reduced the number of TRAP-positive osteoclasts. Exposure of the osteoclasts to amiloride also reduced the number of bone resorption pits on bone slices and the expression of osteoclast-specific gene cathepsin K. CONCLUSION: s ENaC may participate in the regulation of osteoclast differentiation and bone resorption, suggesting its role in functional regulation of the osteoclasts and a possibly new signaling pathway related with ENaC regulation for modulating bone metabolism.
Asunto(s)
Resorción Ósea , Canales Epiteliales de Sodio/metabolismo , Osteoclastos/citología , Animales , Células de la Médula Ósea/citología , Catepsina K/metabolismo , Bovinos , Diferenciación Celular , Factor Estimulante de Colonias de Macrófagos/metabolismo , Ligando RANK/metabolismo , Ratas , Transducción de SeñalRESUMEN
OBJECTIVE: To explore the relation among apoptosis of myocardial cell and the expression of TGF-beta1 in VMC. METHODS AND RESULTS: In the experiment, Viral myocarditis (VMC) in BALB/C mouse was obtained by inculating herpes simplex virus I type into abdominal cavity. The rate of VMC was 91.67% after 3 - 35 days of virus infection. The apoptosis (78.33%) and expression of TGF-beta1 (81.76%) were found in the myocardium of infected mouse by TUNEL and immunohistochemical method and electron microscope. AI of myocardial cell was 34.14+/-11.56 - 26.14+/-10.2. CONCLUSION: Apoptosis and expression of TGF-beta1 may participate in occurrence and development of VMC.