Objective:To investigate the effect of malarial pigment(hemozoin,HZ) on expression of heat shock proteins(HSPs) and cell viability in human monocytes by using a stable cell line(THP-1 cells).Methods:THP-1 cells were f...Objective:To investigate the effect of malarial pigment(hemozoin,HZ) on expression of heat shock proteins(HSPs) and cell viability in human monocytes by using a stable cell line(THP-1 cells).Methods:THP-1 cells were fed with native HZ or treated with pro-apoptotic molecule gliotoxin for 9 h.Thereafter,the protein expression of HSP-27 and HSP-70 was evaluated by western blotting.Alternatively,HZ-fed cells were cultured up to 72 h and cell viability parameters(survival,apoptosis and necrosis rates) were measured by flow cytometric analysis. Results:HZ increased basal protein levels of HSP-27 without altering those of HSP-70 in THP-1 cells,and promoted long-term cell survival without inducing apoptosis.As expected,gliotoxin inhibited HSP-27 protein expression and promoted long-term cell apoptosis.Conclusions: Present data show that HZ prevents cell apoptosis and enhances the expression of anli-apoptotic HSP-27 in THP-1 cells,confirming the previous evidences obtained from HZ-fed immunopurified monocytes.Since the use of a stable cell line is pivotal to perform HSP-27 silencing experiments, monocytic THP-1 cells could be a good candidate line for such an approach,which is heavily required to clarify the role of HSP-27 in survival of impaired HZ-fed monocytes during falciparum malaria.展开更多
The relation between the expression and activity of MMP-9 in C-reactive protein （CRP）-induced human THP-1 mononuclear cells and the activation of nuclear factor kappa-B （NF-κB） was studied to investigate the poss...The relation between the expression and activity of MMP-9 in C-reactive protein （CRP）-induced human THP-1 mononuclear cells and the activation of nuclear factor kappa-B （NF-κB） was studied to investigate the possible role of CRP in plaque destabilization. Human THP-1 cells were incubated in the presence of CRP at 0 （control group）, 25, 50 and 100 μg/mL （CRP groups） for 24 h. In PDTC （a specific NF-κB inhibitor） group, the cells were pre-treated with PDTC at 10 μmol/L and then with 100 μg/mL CRP. The conditioned media （CM） and human THP-1 cells in different groups were harvested. MMP-9 expression in CM and human THP-1 cells was measured by ELISA and Western blotting. MMP-9 activity was assessed by fluorogenic substrates. The expression of NF-κB inhibitor α （IκB-α） and NF-κB p65 was detected by Western blotting and ELISA respectively. The results showed that CRP increased the expression and activity of MMP-9 in a dose-dependent manner in the human THP-1 cells. Western blotting revealed that IiB-α expression was decreased in the cells with the concentrations of CRP and ELISA demonstrated that NF-κB p65 expression in the CRP-induced cells was increased. After pre-treatment of the cells with PDTC at 10 μmol/L, the decrease in IκB-α expression and the increase in NF-κB p65 expression in the CRP-induced cells were inhibited, and the expression and activity of MMP-9 were lowered too. It is concluded that increased expression and activity of MMP-9 in CRP-induced human THP-1 cells may be associated with activation of NF-κB. Down-regulation of the expression and activity of MMP-9 may be a new treatment alternative for plaque stabilization by inhibiting the NF-κB activation.展开更多
目的:观察环孢素A(CsA)处理急性单核细胞白血病细胞株THP-1后对柔红霉素(DNR)的耐药性及与多药耐药相关蛋白-1(MRP1)表达的关系,探讨CsA对THP-1细胞的化疗增敏作用及相关机制。方法:噻唑蓝(MTT)法、荧光分光光度法、共聚焦激光扫描显微...目的:观察环孢素A(CsA)处理急性单核细胞白血病细胞株THP-1后对柔红霉素(DNR)的耐药性及与多药耐药相关蛋白-1(MRP1)表达的关系,探讨CsA对THP-1细胞的化疗增敏作用及相关机制。方法:噻唑蓝(MTT)法、荧光分光光度法、共聚焦激光扫描显微镜(CLSM)法分别检测CsA处理前后50% THP-1细胞生长受抑的DNR浓度(IC50)、THP-1细胞内DNR含量及分布的变化。免疫细胞化学法、Western blot法检测CsA处理前后THP-1细胞MRP1蛋白表达量的变化。结果:CsA处理后THP-1细胞的IC50明显下降(1.5364±0.1751 vs 0.5588±0.0547,P<0.01),细胞内DNR含量明显增加(21.40±1.71 vs 131.96±16.45,P<0.01),且胞浆内分布更加均匀;同时MRP1蛋白表达量增高(0.2665±0.0042 vs 0.3169±0.0062,P<0.01)。结论:CsA可增加THP-1细胞对DNR的敏感性,降低其耐药性,并提示CsA对THP-1细胞耐药性的改变不是通过降低其MRP1蛋白表达量来实现的。展开更多
目的:构建A20和增强型绿色荧光蛋白(enhanced green fluorescent protein,EGFP)共表达的腺病毒载体,观察其对人单核-巨噬细胞系THP-1的影响.方法:PCR扩增目的基因片段A20,将目的基因与载体GV314连接获得重组穿梭质粒pGV314-A20,在DH5a...目的:构建A20和增强型绿色荧光蛋白(enhanced green fluorescent protein,EGFP)共表达的腺病毒载体,观察其对人单核-巨噬细胞系THP-1的影响.方法:PCR扩增目的基因片段A20,将目的基因与载体GV314连接获得重组穿梭质粒pGV314-A20,在DH5a感受态细胞中扩增,同源重组得到含有目的基因的腺病毒载体,转染293T细胞,包装成具有感染能力的共表达A20和EGFP的腺病毒颗粒,转染目的细胞THP-1,通过Western blot检测A20蛋白在THP-1细胞的表达,EILSA检测脂多糖(lipopolysaccharide,L P S)刺激T H P-1后其上清肿瘤坏死因子-α(tumor necrosis factorα,TNF-α)和白介素-6(interleukin-6,IL-6)的表达.结果:限制性内切酶酶切鉴定与DNA测序证实重组载体构建成功,包装的腺病毒滴度达到1×1011 pfu/mL,感染了腺病毒后的293细胞出现了明显的气球样变,Western blot证实转染THP-1后A20蛋白表达显著增加,与空白组比较,THP-1上清中TNF-α和IL-6的表达下降,两者相比,有统计学差异(P<0.05).结论:成功构建A20与EGFP共表达腺病毒载体,能够在THP-1细胞表达,降低其炎性因子表达,为进一步研究其抗炎功能奠定基础.展开更多
基金supported by University of Torino Intramural Funds to GG and by grants to MP from the Compagnia di San Paolo,Torino,in the context of the Italian Malaria Network
文摘Objective:To investigate the effect of malarial pigment(hemozoin,HZ) on expression of heat shock proteins(HSPs) and cell viability in human monocytes by using a stable cell line(THP-1 cells).Methods:THP-1 cells were fed with native HZ or treated with pro-apoptotic molecule gliotoxin for 9 h.Thereafter,the protein expression of HSP-27 and HSP-70 was evaluated by western blotting.Alternatively,HZ-fed cells were cultured up to 72 h and cell viability parameters(survival,apoptosis and necrosis rates) were measured by flow cytometric analysis. Results:HZ increased basal protein levels of HSP-27 without altering those of HSP-70 in THP-1 cells,and promoted long-term cell survival without inducing apoptosis.As expected,gliotoxin inhibited HSP-27 protein expression and promoted long-term cell apoptosis.Conclusions: Present data show that HZ prevents cell apoptosis and enhances the expression of anli-apoptotic HSP-27 in THP-1 cells,confirming the previous evidences obtained from HZ-fed immunopurified monocytes.Since the use of a stable cell line is pivotal to perform HSP-27 silencing experiments, monocytic THP-1 cells could be a good candidate line for such an approach,which is heavily required to clarify the role of HSP-27 in survival of impaired HZ-fed monocytes during falciparum malaria.
文摘The relation between the expression and activity of MMP-9 in C-reactive protein （CRP）-induced human THP-1 mononuclear cells and the activation of nuclear factor kappa-B （NF-κB） was studied to investigate the possible role of CRP in plaque destabilization. Human THP-1 cells were incubated in the presence of CRP at 0 （control group）, 25, 50 and 100 μg/mL （CRP groups） for 24 h. In PDTC （a specific NF-κB inhibitor） group, the cells were pre-treated with PDTC at 10 μmol/L and then with 100 μg/mL CRP. The conditioned media （CM） and human THP-1 cells in different groups were harvested. MMP-9 expression in CM and human THP-1 cells was measured by ELISA and Western blotting. MMP-9 activity was assessed by fluorogenic substrates. The expression of NF-κB inhibitor α （IκB-α） and NF-κB p65 was detected by Western blotting and ELISA respectively. The results showed that CRP increased the expression and activity of MMP-9 in a dose-dependent manner in the human THP-1 cells. Western blotting revealed that IiB-α expression was decreased in the cells with the concentrations of CRP and ELISA demonstrated that NF-κB p65 expression in the CRP-induced cells was increased. After pre-treatment of the cells with PDTC at 10 μmol/L, the decrease in IκB-α expression and the increase in NF-κB p65 expression in the CRP-induced cells were inhibited, and the expression and activity of MMP-9 were lowered too. It is concluded that increased expression and activity of MMP-9 in CRP-induced human THP-1 cells may be associated with activation of NF-κB. Down-regulation of the expression and activity of MMP-9 may be a new treatment alternative for plaque stabilization by inhibiting the NF-κB activation.
文摘目的:观察环孢素A(CsA)处理急性单核细胞白血病细胞株THP-1后对柔红霉素(DNR)的耐药性及与多药耐药相关蛋白-1(MRP1)表达的关系,探讨CsA对THP-1细胞的化疗增敏作用及相关机制。方法:噻唑蓝(MTT)法、荧光分光光度法、共聚焦激光扫描显微镜(CLSM)法分别检测CsA处理前后50% THP-1细胞生长受抑的DNR浓度(IC50)、THP-1细胞内DNR含量及分布的变化。免疫细胞化学法、Western blot法检测CsA处理前后THP-1细胞MRP1蛋白表达量的变化。结果:CsA处理后THP-1细胞的IC50明显下降(1.5364±0.1751 vs 0.5588±0.0547,P<0.01),细胞内DNR含量明显增加(21.40±1.71 vs 131.96±16.45,P<0.01),且胞浆内分布更加均匀;同时MRP1蛋白表达量增高(0.2665±0.0042 vs 0.3169±0.0062,P<0.01)。结论:CsA可增加THP-1细胞对DNR的敏感性,降低其耐药性,并提示CsA对THP-1细胞耐药性的改变不是通过降低其MRP1蛋白表达量来实现的。
文摘目的:构建A20和增强型绿色荧光蛋白(enhanced green fluorescent protein,EGFP)共表达的腺病毒载体,观察其对人单核-巨噬细胞系THP-1的影响.方法:PCR扩增目的基因片段A20,将目的基因与载体GV314连接获得重组穿梭质粒pGV314-A20,在DH5a感受态细胞中扩增,同源重组得到含有目的基因的腺病毒载体,转染293T细胞,包装成具有感染能力的共表达A20和EGFP的腺病毒颗粒,转染目的细胞THP-1,通过Western blot检测A20蛋白在THP-1细胞的表达,EILSA检测脂多糖(lipopolysaccharide,L P S)刺激T H P-1后其上清肿瘤坏死因子-α(tumor necrosis factorα,TNF-α)和白介素-6(interleukin-6,IL-6)的表达.结果:限制性内切酶酶切鉴定与DNA测序证实重组载体构建成功,包装的腺病毒滴度达到1×1011 pfu/mL,感染了腺病毒后的293细胞出现了明显的气球样变,Western blot证实转染THP-1后A20蛋白表达显著增加,与空白组比较,THP-1上清中TNF-α和IL-6的表达下降,两者相比,有统计学差异(P<0.05).结论:成功构建A20与EGFP共表达腺病毒载体,能够在THP-1细胞表达,降低其炎性因子表达,为进一步研究其抗炎功能奠定基础.
