ABSTRACT
OBJECTIVE@#To determine the role of extracellular signal regulated kinase (ERK) signaling pathway in SiO₂ induced epithelial-mesenchymal transition (EMT) in human bronchial epithelial cells (HBEC) in vitro.@*METHODS@#HBEC were treated with SiO₂ (0-300 μg/mL) for 72 h or pretreated with U0126 (0-30 μmol/L) for 1 h and then treated with 200 μg/mL SiO₂ for 72 h. Western blot was used to detect the protein expression of E-cadherin and α-smooth muscle actin (α-SMA). The activity of ERK was examined by mitogen-activated protein kinase (MAPK) activity assay kit in HBEC exposing to SiO₂ (200 μg/mL) for 0-8 h.@*RESULTS@#The expression of E-cadherin decreased gradually in SiO₂ -stimulated HBEC, and the effect was most significant at 300 μg/mL (P<0.01). The expression of α-SMA increased and the effect was most evident at 200 μg/mL (P<0.01). With SiO₂ treatment, the activity of ERK was upregulated significantly. The phosphorylation of ERK increased at 30 min and decreased after 1 h. U0126 significantly inhibited SiO₂ -induced expression changes in E-cadherin and α-SMA. At 30 μmol/L, the effect was most evident(P<0.01).@*CONCLUSION@#ERK signaling pathway mediated EMT induced by SiO₂ in HBEC.
Subject(s)
Humans , Actins , Metabolism , Bronchi , Cell Biology , Cadherins , Metabolism , Cell Transdifferentiation , Cells, Cultured , Epithelial Cells , Cell Biology , Physiology , Epithelial-Mesenchymal Transition , MAP Kinase Signaling System , Physiology , Mitogen-Activated Protein Kinases , Metabolism , Silicon Dioxide , PharmacologyABSTRACT
The training of teaching ability is an important context of master course.Pathology Department of Xiang Ya School of Medicine take experimental teaching practice as the important way to improve their pathological experimental teaching skill.In this paper we introduced our experience.
ABSTRACT
OBJECTIVE@#To investigate the expression of fibroblast growth factor-2 (FGF-2) and osteopontin (OPN) in non-small cell lung cancer (NSCLC) tissues and analyze the correlation between FGF-2 and OPN.@*METHODS@#Immunohistochemical SP method was used to detect the expression of FGF-2 and OPN in 76 patients with NSCLC and 15 normal lung tissues. The effect of FGF-2 on OPN expression at mRNA and protein level in A549 cell was examined by RT-PCR and Western blot.@*RESULTS@#The positive expression of FGF-2 (65.8%) and OPN (60.5%) in the NSCLC tissues was significantly higher than that in the normal lung tissues (13.3% and 0, respectively ) (P0.05).A positive correlation was found between the expression of FGF-2 and OPN in NSCLC (r=0.552,P<0.01). The expression of OPN protein and mRNA was up-regulated by FGF-2 in A549 cells.@*CONCLUSION@#The overexpression of FGF-2 and OPN is related to the metastasis and invasion of NSCLC.FGF-2 may promote the metastasis and invasion of NSCLC depending on the upregulation of OPN expression.