Bronchial asthma is a common chronic inflammatory disease characterized by airway hyperresponsiveness(AHR),inflammatory cell infiltration,and airway remodeling.F-box/WD repeat-containing protein 7(FBXW7),an E3 ubiquit...Bronchial asthma is a common chronic inflammatory disease characterized by airway hyperresponsiveness(AHR),inflammatory cell infiltration,and airway remodeling.F-box/WD repeat-containing protein 7(FBXW7),an E3 ubiquitin ligase,is required for various endothelial functions,such as cell migration,inflammation,and endothelial integrity.This study aimed to investigate the role of FBXW7 in lipopolysaccharide(LPS)-induced epithelial barrier impairment in bronchial epithelial cells in vitro.By using lentivirus-based technology,FBXW7 was overexpressed or silenced(24 h)in human bronchial epithelial(16HBE)cells,which were treated with LPS or not(24 h).Immunoprecipitation(IP)detection and Western blot analysis were used to evaluate the interaction of target proteins.Cell permeability was measured using transepithelial electrical resistance and FITC dextran flux(48 h).IL-1β,IL-18 and TNF-αin cell supernatants were measured using ELISA(48 h).The results showed that LPS stimulation suppressed FBXW7 expression in a time-and dose-dependent manner.LPS exposure decreased cell proliferation,elevated IL-1β,IL-18 and TNF-α,increased epithelial permeability,and p38 phosphorylation.These LPS-induced changes were partly compromised by FBXW7 overexpression.Similar to LPS stimulation,FBXW7 knockdown increased epithelial permeability and levels of inflammatory cytokines and p38 phosphorylation,which were,in part,blocked by apoptosis signal-regulating kinase(ASK)1 knockdown or p38 pathway inhibition.IP and Western blot analysis showed that FBXW7 interacted with ASK1.ASK1 expression was inversely associated with FBXW7 expression.FBXW7 overexpression markedly enhanced ASK1 ubiquitination.These data revealed that FBXW7 counter against inflammation and protects epithelial barrier integrity in bronchial epithelial cells by promoting ubiquitination-mediated degradation of ASK1 via the p38 pathway.展开更多
Developing an electrically conductive and corrosion-resistant coating is essential for metal bipolar plates of polymer electrolyte membrane fuel cells(PEMFCs). Although enhanced corrosion resistance was seen for Cr co...Developing an electrically conductive and corrosion-resistant coating is essential for metal bipolar plates of polymer electrolyte membrane fuel cells(PEMFCs). Although enhanced corrosion resistance was seen for Cr coated stainless steel(Cr/SS) bipolar plates, they experience a quick decrease of through-plane electrical conductivity due to the formation of a porous and low-conductive corrosion product layer at the plate surface, thus leading to an increase in interfacial contact resistance(ICR). To tackle this issue, the multilayer Cr coatings were deposited using the magnetron sputtering with a remote inductively coupled oxygen plasma(O-ICP) in the present study. After the O-ICP treatment, a Cr oxide layer(Cr O*) is formed on the specimen surface. The Cr O*/Cr/SS has a remarkably lower stable corrosion rate(iss) than that of the native Cr oxides(Cr On/Cr/SS). Compared with Cr On/Cr/SS, the excellent performance of Cr O*/Cr/SS is attributed to a denser and thicker surface layer of Cr O* with Cr being oxidized to its highest valence state,Cr(VI). More importantly, the through-plane electrical conductivity of the specimens treated by the optimized O-ICP decreases much slowly than Cr On/Cr/SS and thus, the increament of ICR of Cr O*/Cr/SS after the potentiostatic polarization test is considerably smaller than that of Cr On/Cr/SS, which is benefited from the reduced issthat mitigates the deposition of corrosion products and hinders further oxidation of Cr coating. Therefore, Cr O*/Cr/SS proves to be a well balanced trade-off between corrosion resistance and through-plane electrical conductivity. The results of this study demonstrate that O-ICP treatment on a conductive metal coating is an effective strategy to improve the corrosion resistance and suppress the increase of ICR over the long-term polarization. The technique reported herein exhibits its promising potential application in preparing corrosion resistant and electrically conductive coatings on metal bipolar plates to be used in PEMFCs.展开更多
实验分析了阴极硝化耦合阳极反硝化微生物燃料电池在不同外阻(10、100、500Ω和无穷大)下,电池的产电性能、阴极液和阳极液的电导率以及脱氮除碳能力的变化情况。结果表明,在低电阻下,输出的稳定电流较大,有机物降解速率较快,TN去除率...实验分析了阴极硝化耦合阳极反硝化微生物燃料电池在不同外阻(10、100、500Ω和无穷大)下,电池的产电性能、阴极液和阳极液的电导率以及脱氮除碳能力的变化情况。结果表明,在低电阻下,输出的稳定电流较大,有机物降解速率较快,TN去除率较高。当外阻为10Ω时,输出的稳定电流是3.61 m A,COD的去除速率最快为10.33mg/(L·h),在运行160 h时TN去除率达到100%。MFC运行过程中,阳极溶液的电导率逐渐减小,阴极溶液的电导率逐渐增大。当外阻为10Ω时,阴阳极溶液的电导率差最大。CV扫描表明外阻对阳极生物膜氧化还原能力有影响,且低电阻下阳极形成的生物膜上产电活性菌的氧化能力越强。展开更多
基金funded by Fundamental research program funding of Ninth People’s Hospital Affiliated to Shanghai Jiaotong University School of Medicine(JYZZ069).
文摘Bronchial asthma is a common chronic inflammatory disease characterized by airway hyperresponsiveness(AHR),inflammatory cell infiltration,and airway remodeling.F-box/WD repeat-containing protein 7(FBXW7),an E3 ubiquitin ligase,is required for various endothelial functions,such as cell migration,inflammation,and endothelial integrity.This study aimed to investigate the role of FBXW7 in lipopolysaccharide(LPS)-induced epithelial barrier impairment in bronchial epithelial cells in vitro.By using lentivirus-based technology,FBXW7 was overexpressed or silenced(24 h)in human bronchial epithelial(16HBE)cells,which were treated with LPS or not(24 h).Immunoprecipitation(IP)detection and Western blot analysis were used to evaluate the interaction of target proteins.Cell permeability was measured using transepithelial electrical resistance and FITC dextran flux(48 h).IL-1β,IL-18 and TNF-αin cell supernatants were measured using ELISA(48 h).The results showed that LPS stimulation suppressed FBXW7 expression in a time-and dose-dependent manner.LPS exposure decreased cell proliferation,elevated IL-1β,IL-18 and TNF-α,increased epithelial permeability,and p38 phosphorylation.These LPS-induced changes were partly compromised by FBXW7 overexpression.Similar to LPS stimulation,FBXW7 knockdown increased epithelial permeability and levels of inflammatory cytokines and p38 phosphorylation,which were,in part,blocked by apoptosis signal-regulating kinase(ASK)1 knockdown or p38 pathway inhibition.IP and Western blot analysis showed that FBXW7 interacted with ASK1.ASK1 expression was inversely associated with FBXW7 expression.FBXW7 overexpression markedly enhanced ASK1 ubiquitination.These data revealed that FBXW7 counter against inflammation and protects epithelial barrier integrity in bronchial epithelial cells by promoting ubiquitination-mediated degradation of ASK1 via the p38 pathway.
基金financially supported by the National Natural Science Foundation of China(No.51901188,51701113)the Natural Science Basic Research Program from Shaanxi province(No.2020JQ-171)+2 种基金the Fundamental Research Funds for the Central Universitiesthe Canada First Research Excellence Fundthe Natural Sciences and Engineering Research Council of Canada(No.RGPIN-2016-05494)。
文摘Developing an electrically conductive and corrosion-resistant coating is essential for metal bipolar plates of polymer electrolyte membrane fuel cells(PEMFCs). Although enhanced corrosion resistance was seen for Cr coated stainless steel(Cr/SS) bipolar plates, they experience a quick decrease of through-plane electrical conductivity due to the formation of a porous and low-conductive corrosion product layer at the plate surface, thus leading to an increase in interfacial contact resistance(ICR). To tackle this issue, the multilayer Cr coatings were deposited using the magnetron sputtering with a remote inductively coupled oxygen plasma(O-ICP) in the present study. After the O-ICP treatment, a Cr oxide layer(Cr O*) is formed on the specimen surface. The Cr O*/Cr/SS has a remarkably lower stable corrosion rate(iss) than that of the native Cr oxides(Cr On/Cr/SS). Compared with Cr On/Cr/SS, the excellent performance of Cr O*/Cr/SS is attributed to a denser and thicker surface layer of Cr O* with Cr being oxidized to its highest valence state,Cr(VI). More importantly, the through-plane electrical conductivity of the specimens treated by the optimized O-ICP decreases much slowly than Cr On/Cr/SS and thus, the increament of ICR of Cr O*/Cr/SS after the potentiostatic polarization test is considerably smaller than that of Cr On/Cr/SS, which is benefited from the reduced issthat mitigates the deposition of corrosion products and hinders further oxidation of Cr coating. Therefore, Cr O*/Cr/SS proves to be a well balanced trade-off between corrosion resistance and through-plane electrical conductivity. The results of this study demonstrate that O-ICP treatment on a conductive metal coating is an effective strategy to improve the corrosion resistance and suppress the increase of ICR over the long-term polarization. The technique reported herein exhibits its promising potential application in preparing corrosion resistant and electrically conductive coatings on metal bipolar plates to be used in PEMFCs.
文摘实验分析了阴极硝化耦合阳极反硝化微生物燃料电池在不同外阻(10、100、500Ω和无穷大)下,电池的产电性能、阴极液和阳极液的电导率以及脱氮除碳能力的变化情况。结果表明,在低电阻下,输出的稳定电流较大,有机物降解速率较快,TN去除率较高。当外阻为10Ω时,输出的稳定电流是3.61 m A,COD的去除速率最快为10.33mg/(L·h),在运行160 h时TN去除率达到100%。MFC运行过程中,阳极溶液的电导率逐渐减小,阴极溶液的电导率逐渐增大。当外阻为10Ω时,阴阳极溶液的电导率差最大。CV扫描表明外阻对阳极生物膜氧化还原能力有影响,且低电阻下阳极形成的生物膜上产电活性菌的氧化能力越强。
