BACKGROUND Ulcerative colitis(UC)is a chronic,nonspecific intestinal inflammatory disease with undefined pathogenesis.Non-SMC condensin I complex subunit D2(NCAPD2)and non-SMC condensin II complex subunit D3(NCAPD3)pl...BACKGROUND Ulcerative colitis(UC)is a chronic,nonspecific intestinal inflammatory disease with undefined pathogenesis.Non-SMC condensin I complex subunit D2(NCAPD2)and non-SMC condensin II complex subunit D3(NCAPD3)play pivotal roles in chromosome assembly and segregation during both mitosis and meiosis.To date,there has been no relevant report about the functional role of NCAPD2 and NCAPD3 in UC.AIM To determine the level of NCAPD2/3 in intestinal mucosa and explore the mechanisms of NCAPD2/3 in UC.METHODS Levels of NCAPD2/3 in intestinal tissue were detected in 30 UC patients and 30 healthy individuals with in situ hybridization(ISH).In vitro,NCM60 cells were divided into the NC group,model group,si-NCAPD2 group,si-NCAPD3 group and si-NCAPD2+si-NCAPD3 group.Inflammatory cytokines were measured by ELISA,IKK and NF-κB were evaluated by western blot,and IKK nucleation and NF-κB volume were analyzed by immunofluorescence assay.RESULTS Compared with expression in healthy individuals,NCAPD2 and NCAPD3 expression in intestinal tissue was significantly upregulated(P<0.001)in UC patients.Compared with levels in the model group,IL-1β,IL-6 and TNF-αin the si-NCAPD2,si-NCAPD3 and si-NCAPD2+si-NCAPD3 groups were significantly downregulated(P<0.01).IKK and NF-κB protein expression in the si-NCAPD2,si-NCAPD3 and si-NCAPD2+si-NCAPD3 groups was significantly decreased(P<0.01).Moreover,IKK nucleation and NF-κB volume were suppressed upon si-NCAPD2,si-NCAPD3 and si-NCAPD2+si-NCAPD3 transfection.CONCLUSION NCAPD2/3 is highly expressed in the intestinal mucosa of patients with active UC.Overexpression of NCAPD2/3 promotes the release of pro-inflammatory cytokines by modulating the IKK/NF-κB signaling pathway.展开更多
OBJECTIVE The greatest challenge in chemotherapy of ischemic stroke is the construction a suitable delivery system to overcome the poor physicochemical properties of drug and its low permeability across the blood brai...OBJECTIVE The greatest challenge in chemotherapy of ischemic stroke is the construction a suitable delivery system to overcome the poor physicochemical properties of drug and its low permeability across the blood brain barrier(BBB).METHODS In the present study,dendrimer,polyamidoamine(PAMAM),was synthesized as the nano-drug carriers.Angiopep-2,which has been proved excellent ability to cross the BBB,was exploited as the targeting ligand to conjugate PAMAM via bifunctional polyethylene glycol(PEG).Then scutellarin(STA)was encapsulated into the functionalized nanoparticles(NPs)to formulate Angiopep-2 modified STA-loaded PEG-PAMAM NPs.Ischemic stroke model was established to evaluate the treatment efficacy and protective mechanism of Angiopep-2-STA-PEG-PAMAM NPs.RESULTS The pharmacokinetics and biodistribu-tion demonstrated that Angiopep-2-STA-PEG-PAMAM NPs exhibited significantly higher plasma concentration from 1 h to 10 h after intravenous administration and improve accumulation in brain(4.7-fold)compared with STA solution.Moreover,prolonged elimination half-life(4.8-fold)and lower clearance(3.4-fold)were observed.The brain uptake study of 6-coumarin confirmed that Angiopep-2-PEG-PAMAM NPs possessed better brain targeting efficacy(3.2-fold)than PEG-PAMAM NPs.Angiopep-2-STA-PEG-PAMAM NPs obviously ameliorated infarct volume,neurological deficit,histopathological severity and neuronal apoptosis.In addition,Angiopep-2-STA-PEG-PAMAM NPs markedly inhibited the calcium content and the levels of IL-12p40,IL-13,IL-17 and IL-23.Furthermore,Angiopep-2-STA-PEG-PAMAM NPs significantly decreased the m RNA and protein expressions of HMGB1,TLR2,TLR4,TLR5,My D88,TRIF,TRAM,IRAK-4,TRAF6,IкBα,IKKβand NF-кBp65.CONCLUSION The results suggested that Angiopep-2modified scutellarin-loaded PEG-PAMAM nanocarriers possessed remarkable neuroprotective effects on ischemic stroke through modulation of inflammatory cascades and HMGB1/TLRs/MyD 88-induced NF-κB activation pathways.展开更多
Background:MicroRNAs are closely associated with the progression and outcomes of multiple human diseases,including sepsis.In this study,we examined the role of miR-23a in septic injury.Methods Lipopolysaccharide(LPS)w...Background:MicroRNAs are closely associated with the progression and outcomes of multiple human diseases,including sepsis.In this study,we examined the role of miR-23a in septic injury.Methods Lipopolysaccharide(LPS)was used to induce sepsis in a rat model and H9C2 and HK-2 cells.miR-23a expression was evaluated in rat myocardial and kidney tissues,as well as H9C2 and HK-2 cells.A miR-23a mimic was introduced into cells to identify the role of miR-23a in cell viability,apoptosis,and the secretion of inflammatory cytokines.Furthermore,the effect of Rho-associated kinase 1(ROCK1),a miR-23a target,on cell damage was evaluated,and molecules involved in the underlying mechanism were identified.Results:In the rat model,miR-23a was poorly expressed in myocardial(sham vs.sepsis 1.00±0.06 vs.0.27±0.03,P<0.01)and kidney tissues(sham vs.sepsis 0.27±0.03 vs.1.00±0.06,P<0.01).Artificial overexpression of miR-23a resulted in increased proliferative activity(DNA replication rate:Control vs.LPS vs.LPS+Mock vs.LPS+miR-23a:H9C2 cells:34.13±3.12 vs.12.94±1.21 vs.13.31±1.43 vs.22.94±2.26,P<0.05;HK-2 cells:15.17±1.43 vs.34.52±3.46 vs.35.19±3.12 vs.19.87±1.52,P<0.05),decreased cell apoptosis(Control vs.LPS vs.LPS+Mock vs.LPS+miR-23a:H9C2 cells:11.39±1.04 vs.32.57±2.29 vs.33.08±3.12 vs.21.63±2.35,P<0.05;HK-2 cells:15.17±1.43 vs.34.52±3.46 vs.35.19±3.12 vs.19.87±1.52,P<0.05),and decreased production of inflammatory cytokines,including interleukin-6(Control vs.LPS vs.LPS+Mock vs.LPS+miR-23a:H9C2 cells:59.61±5.14 vs.113.54±12.30 vs.116.51±10.69 vs.87.69±2.97 ng/mL;P<0.05,F=12.67,HK-2 cells:68.12±6.44 vs.139.65±16.62 vs.143.51±13.64 vs.100.82±9.74 ng/mL,P<0.05,F=9.83)and tumor necrosis factor-α(Control vs.LPS vs.LPS+Mock vs.LPS+miR-23a:H9C2 cells:103.20±10.31 vs.169.67±18.84 vs.173.61±15.91 vs.133.36±12.32 ng/mL,P<0.05,F=12.67,HK-2 cells:132.51±13.37 vs.187.47±16.74 vs.143.51±13.64 vs.155.79±15.31 ng/mL,P<0.05,F=9.83)in cells.However,ROCK1 was identified as a miR-23a target,and further up-regulation of ROCK1 mitigated the protective function of miR-23a in LPS-treated H9C2 and HK-2 cells.Moreover,ROCK1 suppressed sirtuin-1(SIRT1)expression to promote the phosphorylation of nuclear factor-kappa B(NF-κB)p65,indicating the possible involvement of this signaling pathway in miR-23a-mediated events.Conclusion:Our results indicate that miR-23a could suppress LPS-induced cell damage and inflammatory cytokine secretion by binding to ROCK1,mediated through the potential participation of the SIRT1/NF-κB signaling pathway.展开更多
基金Supported by National Natural Science Foundation of China,No.81673973Natural Science Foundation of Jiangsu Province,China,No.BK20161577the Developing Program for Highlevel Academic Talent from Jiangsu Hospital of Chinese Medicine,No.y2018rc16
文摘BACKGROUND Ulcerative colitis(UC)is a chronic,nonspecific intestinal inflammatory disease with undefined pathogenesis.Non-SMC condensin I complex subunit D2(NCAPD2)and non-SMC condensin II complex subunit D3(NCAPD3)play pivotal roles in chromosome assembly and segregation during both mitosis and meiosis.To date,there has been no relevant report about the functional role of NCAPD2 and NCAPD3 in UC.AIM To determine the level of NCAPD2/3 in intestinal mucosa and explore the mechanisms of NCAPD2/3 in UC.METHODS Levels of NCAPD2/3 in intestinal tissue were detected in 30 UC patients and 30 healthy individuals with in situ hybridization(ISH).In vitro,NCM60 cells were divided into the NC group,model group,si-NCAPD2 group,si-NCAPD3 group and si-NCAPD2+si-NCAPD3 group.Inflammatory cytokines were measured by ELISA,IKK and NF-κB were evaluated by western blot,and IKK nucleation and NF-κB volume were analyzed by immunofluorescence assay.RESULTS Compared with expression in healthy individuals,NCAPD2 and NCAPD3 expression in intestinal tissue was significantly upregulated(P<0.001)in UC patients.Compared with levels in the model group,IL-1β,IL-6 and TNF-αin the si-NCAPD2,si-NCAPD3 and si-NCAPD2+si-NCAPD3 groups were significantly downregulated(P<0.01).IKK and NF-κB protein expression in the si-NCAPD2,si-NCAPD3 and si-NCAPD2+si-NCAPD3 groups was significantly decreased(P<0.01).Moreover,IKK nucleation and NF-κB volume were suppressed upon si-NCAPD2,si-NCAPD3 and si-NCAPD2+si-NCAPD3 transfection.CONCLUSION NCAPD2/3 is highly expressed in the intestinal mucosa of patients with active UC.Overexpression of NCAPD2/3 promotes the release of pro-inflammatory cytokines by modulating the IKK/NF-κB signaling pathway.
基金The project supported by National Natural Science Foundation of China(NSFC 21476054)the Natural Science Foundation of Heilongjiang Province(B201407)
文摘OBJECTIVE The greatest challenge in chemotherapy of ischemic stroke is the construction a suitable delivery system to overcome the poor physicochemical properties of drug and its low permeability across the blood brain barrier(BBB).METHODS In the present study,dendrimer,polyamidoamine(PAMAM),was synthesized as the nano-drug carriers.Angiopep-2,which has been proved excellent ability to cross the BBB,was exploited as the targeting ligand to conjugate PAMAM via bifunctional polyethylene glycol(PEG).Then scutellarin(STA)was encapsulated into the functionalized nanoparticles(NPs)to formulate Angiopep-2 modified STA-loaded PEG-PAMAM NPs.Ischemic stroke model was established to evaluate the treatment efficacy and protective mechanism of Angiopep-2-STA-PEG-PAMAM NPs.RESULTS The pharmacokinetics and biodistribu-tion demonstrated that Angiopep-2-STA-PEG-PAMAM NPs exhibited significantly higher plasma concentration from 1 h to 10 h after intravenous administration and improve accumulation in brain(4.7-fold)compared with STA solution.Moreover,prolonged elimination half-life(4.8-fold)and lower clearance(3.4-fold)were observed.The brain uptake study of 6-coumarin confirmed that Angiopep-2-PEG-PAMAM NPs possessed better brain targeting efficacy(3.2-fold)than PEG-PAMAM NPs.Angiopep-2-STA-PEG-PAMAM NPs obviously ameliorated infarct volume,neurological deficit,histopathological severity and neuronal apoptosis.In addition,Angiopep-2-STA-PEG-PAMAM NPs markedly inhibited the calcium content and the levels of IL-12p40,IL-13,IL-17 and IL-23.Furthermore,Angiopep-2-STA-PEG-PAMAM NPs significantly decreased the m RNA and protein expressions of HMGB1,TLR2,TLR4,TLR5,My D88,TRIF,TRAM,IRAK-4,TRAF6,IкBα,IKKβand NF-кBp65.CONCLUSION The results suggested that Angiopep-2modified scutellarin-loaded PEG-PAMAM nanocarriers possessed remarkable neuroprotective effects on ischemic stroke through modulation of inflammatory cascades and HMGB1/TLRs/MyD 88-induced NF-κB activation pathways.
文摘Background:MicroRNAs are closely associated with the progression and outcomes of multiple human diseases,including sepsis.In this study,we examined the role of miR-23a in septic injury.Methods Lipopolysaccharide(LPS)was used to induce sepsis in a rat model and H9C2 and HK-2 cells.miR-23a expression was evaluated in rat myocardial and kidney tissues,as well as H9C2 and HK-2 cells.A miR-23a mimic was introduced into cells to identify the role of miR-23a in cell viability,apoptosis,and the secretion of inflammatory cytokines.Furthermore,the effect of Rho-associated kinase 1(ROCK1),a miR-23a target,on cell damage was evaluated,and molecules involved in the underlying mechanism were identified.Results:In the rat model,miR-23a was poorly expressed in myocardial(sham vs.sepsis 1.00±0.06 vs.0.27±0.03,P<0.01)and kidney tissues(sham vs.sepsis 0.27±0.03 vs.1.00±0.06,P<0.01).Artificial overexpression of miR-23a resulted in increased proliferative activity(DNA replication rate:Control vs.LPS vs.LPS+Mock vs.LPS+miR-23a:H9C2 cells:34.13±3.12 vs.12.94±1.21 vs.13.31±1.43 vs.22.94±2.26,P<0.05;HK-2 cells:15.17±1.43 vs.34.52±3.46 vs.35.19±3.12 vs.19.87±1.52,P<0.05),decreased cell apoptosis(Control vs.LPS vs.LPS+Mock vs.LPS+miR-23a:H9C2 cells:11.39±1.04 vs.32.57±2.29 vs.33.08±3.12 vs.21.63±2.35,P<0.05;HK-2 cells:15.17±1.43 vs.34.52±3.46 vs.35.19±3.12 vs.19.87±1.52,P<0.05),and decreased production of inflammatory cytokines,including interleukin-6(Control vs.LPS vs.LPS+Mock vs.LPS+miR-23a:H9C2 cells:59.61±5.14 vs.113.54±12.30 vs.116.51±10.69 vs.87.69±2.97 ng/mL;P<0.05,F=12.67,HK-2 cells:68.12±6.44 vs.139.65±16.62 vs.143.51±13.64 vs.100.82±9.74 ng/mL,P<0.05,F=9.83)and tumor necrosis factor-α(Control vs.LPS vs.LPS+Mock vs.LPS+miR-23a:H9C2 cells:103.20±10.31 vs.169.67±18.84 vs.173.61±15.91 vs.133.36±12.32 ng/mL,P<0.05,F=12.67,HK-2 cells:132.51±13.37 vs.187.47±16.74 vs.143.51±13.64 vs.155.79±15.31 ng/mL,P<0.05,F=9.83)in cells.However,ROCK1 was identified as a miR-23a target,and further up-regulation of ROCK1 mitigated the protective function of miR-23a in LPS-treated H9C2 and HK-2 cells.Moreover,ROCK1 suppressed sirtuin-1(SIRT1)expression to promote the phosphorylation of nuclear factor-kappa B(NF-κB)p65,indicating the possible involvement of this signaling pathway in miR-23a-mediated events.Conclusion:Our results indicate that miR-23a could suppress LPS-induced cell damage and inflammatory cytokine secretion by binding to ROCK1,mediated through the potential participation of the SIRT1/NF-κB signaling pathway.