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AIM: To explore the expression of E-cadherin(E-cd) in the human bronchial epithelial cells(HBECs) and their role in the damage and injury of the airway.METHODS: The E-cd protein expression and the Ecd mRNA of HBECs were determined by immunocytochemistry analysisand RT-PTR analysis,respectively.RESULTS: Ozone-stress caused a decrease in the HBECs membrane E-cd expression and an increase the cytoplasmic E-cd expression(P(0.05)).CONCLUSION: E-cd is distributed on HBECs.O_3-stress decreases the membrane E-cd expression but increases the cytoplamic E-cd expression.The change of E-cd expression may mediate HBECs injuries induced by O_3-stress.
RESUMO
Aim To investigate the effect of Tetramethylpyrazine (TMP) on the proliferation of airway smooth muscle cells (ASMCs). Methods Primary ASMCs of rats were cultured. The absorbance (A490) value of ASMCs treatment with platelet-derived growth factor (PDGF) in the presence of TMP was detected by MTTto observe the anti-proliferation of TMP. The levels of ERK1/2 and p-ERK1/2 proteins were determined by Western blot.Results In presence of the TMP with different concentrations (12.5,25,50,100 and 200 ?mol?L-1) at 6,12,24,36 and 48 hours,compared with control groups,the average inhibitory rates of cell proliferation in all groups were increased significantly (P