AIM: To investigate the effect of Kangxian ruangan keli (KXR) on hepatic stellate cell (HSC) proliferation mediated by platelet-derived growth factor (PDGF) and the underlying mechanism.METHODS: In a serum-free cultur...AIM: To investigate the effect of Kangxian ruangan keli (KXR) on hepatic stellate cell (HSC) proliferation mediated by platelet-derived growth factor (PDGF) and the underlying mechanism.METHODS: In a serum-free culture system, HSCs were treated with a KXR preparation for 24 hours, followed by stimulation with PDGF-BB for 24 hours. Then the cells were incubated again in the medium containing KXR for 3 hours stimulated with PDGF-BB for 5 minutes, and collected. The proliferation of HSC was examined using an MTT assay and flow cytometry. Tyrosine phosphorylation was detected with Western blotting and visualized by the enhenced chemiluminescent (ECL) method.RESULTS: The OD values for the HSCs growing in the media without and with addition of PDGF were 0.17±0.06 and0.82±0.05, respectively. The PDGF-induced increase was hindered remarkably by KXR preparation in a dose-dependent manner. The reaction values for the systems with 5mg/mL, 2.5 mg/mL and 1.25 mg/mL of KXR were 0.28±0.03,0.37±0.02 and 0.43±0.04, respectively. Moreover, the percentages of S-phase cells in these KXR-containing culturesystems were 10.95±1.35, 32.76±1.07 and 43.19±1.09,respectively, all of which were significantly lower than that in the culture free of KXR (68.24±2.72). In addition, the values for tyrosine-phosphorylated protein in HSCs treated with 5 mg/mL and 1.25 mg/mL of KXR were 0.1349±0.0072 and 0.1658±0.0025, respectively, which were smaller than that in the cells treated only with PDGF-BB (0.1813±0.0117).CONCLUSION: Within the dose range used in the present study, KXR preparation shows an inhibitory effect on HSC proliferation induced by PDGF. The mechanism of this process may involve interference with tyrosine phosphorylation mediated by PDGF.展开更多
We studied the effect of salinity on nail-hold- ing power in wood construction. In saline solution, the holding power of nails was less than in purified water. With the increase of salt concentration, the surface and ...We studied the effect of salinity on nail-hold- ing power in wood construction. In saline solution, the holding power of nails was less than in purified water. With the increase of salt concentration, the surface and side nail- holding power of the wood specimens both declined, but the differences between salinity treatments were not sig- nificant. However, compared to the surface and side nail- holding power, the power on the edge was generally less and the difference was not obvious in different salt con- centrations. In the same salt concentration, with the extension of the processing cycle, the performance of holding power of nails showed a downward trend, expect the temporary rise in the middle.展开更多
基金the Natural Science Foundation of Hubei Province, No.2000J042the Science Research Foundation of the Education Office of Hubei Province,No.2000A06010
文摘AIM: To investigate the effect of Kangxian ruangan keli (KXR) on hepatic stellate cell (HSC) proliferation mediated by platelet-derived growth factor (PDGF) and the underlying mechanism.METHODS: In a serum-free culture system, HSCs were treated with a KXR preparation for 24 hours, followed by stimulation with PDGF-BB for 24 hours. Then the cells were incubated again in the medium containing KXR for 3 hours stimulated with PDGF-BB for 5 minutes, and collected. The proliferation of HSC was examined using an MTT assay and flow cytometry. Tyrosine phosphorylation was detected with Western blotting and visualized by the enhenced chemiluminescent (ECL) method.RESULTS: The OD values for the HSCs growing in the media without and with addition of PDGF were 0.17±0.06 and0.82±0.05, respectively. The PDGF-induced increase was hindered remarkably by KXR preparation in a dose-dependent manner. The reaction values for the systems with 5mg/mL, 2.5 mg/mL and 1.25 mg/mL of KXR were 0.28±0.03,0.37±0.02 and 0.43±0.04, respectively. Moreover, the percentages of S-phase cells in these KXR-containing culturesystems were 10.95±1.35, 32.76±1.07 and 43.19±1.09,respectively, all of which were significantly lower than that in the culture free of KXR (68.24±2.72). In addition, the values for tyrosine-phosphorylated protein in HSCs treated with 5 mg/mL and 1.25 mg/mL of KXR were 0.1349±0.0072 and 0.1658±0.0025, respectively, which were smaller than that in the cells treated only with PDGF-BB (0.1813±0.0117).CONCLUSION: Within the dose range used in the present study, KXR preparation shows an inhibitory effect on HSC proliferation induced by PDGF. The mechanism of this process may involve interference with tyrosine phosphorylation mediated by PDGF.
基金financially supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)Jiangsu Overseas Research&Training Program for University Prominent Young&Middle-aged Teachers and Presidents
文摘We studied the effect of salinity on nail-hold- ing power in wood construction. In saline solution, the holding power of nails was less than in purified water. With the increase of salt concentration, the surface and side nail- holding power of the wood specimens both declined, but the differences between salinity treatments were not sig- nificant. However, compared to the surface and side nail- holding power, the power on the edge was generally less and the difference was not obvious in different salt con- centrations. In the same salt concentration, with the extension of the processing cycle, the performance of holding power of nails showed a downward trend, expect the temporary rise in the middle.
