For electronic microscopic observation, we found SSV-transformed NIH 3T3 cells were different from non-transformed cells. In SSV-transformed NIH 3T3 cells nuclei cytoplasma ratio was increased and in cytoplasma the ri...For electronic microscopic observation, we found SSV-transformed NIH 3T3 cells were different from non-transformed cells. In SSV-transformed NIH 3T3 cells nuclei cytoplasma ratio was increased and in cytoplasma the ribosomes (polyribosomes were attached to the swollen rough endoplasmic reticulum. It was likely that ribosomes were lined together functionally and structionally to produce specific protein (PDGF-like protein).展开更多
In vitro responses of human primary pulp cells (HPCs) and 3T3 mouse fibroblasts to six contempo-rary commercial dental restoratives were evaluated using the WST-1 assay. The results show that Fuji II is not cytotoxic ...In vitro responses of human primary pulp cells (HPCs) and 3T3 mouse fibroblasts to six contempo-rary commercial dental restoratives were evaluated using the WST-1 assay. The results show that Fuji II is not cytotoxic to both cells. Fuji II LC is not cyto-toxic to HPCs but cytotoxic to 3T3 cells, indicating that 3T3 cells are more vulnerable to 2-hydroxyethyl methacrylate (HEMA) than HPCs. Vitremer is very cytotoxic probably due to having diphenyliodonium chloride and HEMA in it. Z100 is very cytotoxic probably due to having triethylene glycol dimethacry-late (TEGDMA) in it. P60 is cytotoxic but less cyto-toxic than Z100 probably due to no TEGDMA in it. Durelon is the most cytotoxic among the six materials studied probably due to the high cytotoxicity of zinc ions. Additionally, the cytotoxcity of the tested mate-rials was found to be dose-dependent.展开更多
In vitro cytotoxicity of six contemporary commercial dental filling restoratives on human dental primary cells, pulp cells (HPCs) and human gingival fibroblasts (HGFs), were tested using WST-1 assay. Continuous 3T3 mo...In vitro cytotoxicity of six contemporary commercial dental filling restoratives on human dental primary cells, pulp cells (HPCs) and human gingival fibroblasts (HGFs), were tested using WST-1 assay. Continuous 3T3 mouse fibroblast cell lines were used for comparison. The results show that conventional glass-ionomer cement (GIC) Fuji II is not cytotoxic to all the cells. Resin-modified GIC (RMGIC) Fuji II LC is not cytotoxic to both HPCs and HGFs but cytotoxic to 3T3 cells. RMGIC Vitremer and resin composite Z100 are very cytotoxic to all the cells. Resin composite P60 is cytotoxic but much less cytotoxic than Z100. Polycarboxylate cement Durelon is the most cytotoxic among the six tested materials. It was found that continuous 3T3 cell lines were more vulnerable to leachable cytotoxic components than primary HPCs and HGFs. It was also found that the cytotoxcity of the tested materials was dose-dependent.展开更多
Objective To establish a stable and efficient method of culturing imDCs in vitro,and to explore the effect of GW5074,which blocks ERK1 /2 signal pathway in the process of immature dentritic cells ( imDCs) on inducing ...Objective To establish a stable and efficient method of culturing imDCs in vitro,and to explore the effect of GW5074,which blocks ERK1 /2 signal pathway in the process of immature dentritic cells ( imDCs) on inducing differentiation of the naive allogeneic CD4 + T展开更多
The occurrence of massive CD4+ T cell depletion is one of the most prominent characteristics of human immunodeficiency virus type 1 (HIV-1) infection during acute phase, resulting in unrestorable destruction to the im...The occurrence of massive CD4+ T cell depletion is one of the most prominent characteristics of human immunodeficiency virus type 1 (HIV-1) infection during acute phase, resulting in unrestorable destruction to the immune system. The infected host undergoes an asymptomatic period lasting several years with low viral load and ostensibly healthy status, which is presumably due to virus-specific adaptive immune responses. In the absence of therapy, an overwhelming majority of cases develop to AIDS within 8-10 years of latent infection. In this review, we discuss the roles in AIDS pathogenesis played by massive CD4+ T lymphocytes depletion in gut-associated lymphoid tissue (GALT) during acute infection and abnormal immune activation emerging in the later part of chronic phase.展开更多
To evaluate and discuss two novels in vitro alternative tests which based on the 2nd and 4th event of the AOP in skin sensitization and their application in skin sensitization evaluation of cosmetics in vitro.The DSen...To evaluate and discuss two novels in vitro alternative tests which based on the 2nd and 4th event of the AOP in skin sensitization and their application in skin sensitization evaluation of cosmetics in vitro.The DSens(DSens method)and Jurkat(TCPA method)were used as the test models and 9 of reference chemicals and 12 kinds of cosmetic products were used to confirm and assess the application capability in skin sensitization.The results showed that the DSens method was more sensitive to the reference chemicals compare to the TCPA method.All the results of cosmetic products showed a high consistency between these two assays and h-CLAT or in vivo assay.As the new screening method for skin sensitization evaluation of cosmetics,the in vitro alternative tests based on AOP have certain effectiveness.The reasonable combination strategy can bring a bright future for the development and application of animal alternative test in China.展开更多
目的:观察雷帕霉素体外对小鼠调节性T细胞(regulatory T cells,Treg)分化和增殖的影响,为进一步探讨其可能的免疫耐受诱导机制奠定基础。方法:无菌条件下取C57BL/6小鼠脾脏,分离单个核细胞,免疫磁珠阴性分选获得CD4+T细胞,分别与0.1μmo...目的:观察雷帕霉素体外对小鼠调节性T细胞(regulatory T cells,Treg)分化和增殖的影响,为进一步探讨其可能的免疫耐受诱导机制奠定基础。方法:无菌条件下取C57BL/6小鼠脾脏,分离单个核细胞,免疫磁珠阴性分选获得CD4+T细胞,分别与0.1μmol/L雷帕霉素(RAPA组)、0.5μmol/L环孢素(CsA组)进行共培养7d,并以正常培养细胞作为空白对照。流式细胞仪检测各组CD4+CD25+Treg细胞比例;RT-PCR检测各组T细胞Foxp3 mRNA表达水平。结果:与空白对照[(7.42±0.82)%]相比,CsA组CD4+CD25+Treg细胞[(3.72±0.74)%]所占比例明显降低(P<0.01);RAPA组CD4+CD25+Treg细胞[(11.47±1.08)%]所占比例明显升高(P<0.01)。RAPA组T细胞Foxp3 mRNA表达明显高于CsA组和空白对照(P<0.01);CsA组Foxp3 mRNA表达低于空白对照(P<0.05)。结论:雷帕霉素体外可促进CD4+CD25+Treg细胞的分化和增殖,有利于免疫耐受的形成,其免疫抑制机制不同于CsA。展开更多
文摘For electronic microscopic observation, we found SSV-transformed NIH 3T3 cells were different from non-transformed cells. In SSV-transformed NIH 3T3 cells nuclei cytoplasma ratio was increased and in cytoplasma the ribosomes (polyribosomes were attached to the swollen rough endoplasmic reticulum. It was likely that ribosomes were lined together functionally and structionally to produce specific protein (PDGF-like protein).
文摘In vitro responses of human primary pulp cells (HPCs) and 3T3 mouse fibroblasts to six contempo-rary commercial dental restoratives were evaluated using the WST-1 assay. The results show that Fuji II is not cytotoxic to both cells. Fuji II LC is not cyto-toxic to HPCs but cytotoxic to 3T3 cells, indicating that 3T3 cells are more vulnerable to 2-hydroxyethyl methacrylate (HEMA) than HPCs. Vitremer is very cytotoxic probably due to having diphenyliodonium chloride and HEMA in it. Z100 is very cytotoxic probably due to having triethylene glycol dimethacry-late (TEGDMA) in it. P60 is cytotoxic but less cyto-toxic than Z100 probably due to no TEGDMA in it. Durelon is the most cytotoxic among the six materials studied probably due to the high cytotoxicity of zinc ions. Additionally, the cytotoxcity of the tested mate-rials was found to be dose-dependent.
文摘In vitro cytotoxicity of six contemporary commercial dental filling restoratives on human dental primary cells, pulp cells (HPCs) and human gingival fibroblasts (HGFs), were tested using WST-1 assay. Continuous 3T3 mouse fibroblast cell lines were used for comparison. The results show that conventional glass-ionomer cement (GIC) Fuji II is not cytotoxic to all the cells. Resin-modified GIC (RMGIC) Fuji II LC is not cytotoxic to both HPCs and HGFs but cytotoxic to 3T3 cells. RMGIC Vitremer and resin composite Z100 are very cytotoxic to all the cells. Resin composite P60 is cytotoxic but much less cytotoxic than Z100. Polycarboxylate cement Durelon is the most cytotoxic among the six tested materials. It was found that continuous 3T3 cell lines were more vulnerable to leachable cytotoxic components than primary HPCs and HGFs. It was also found that the cytotoxcity of the tested materials was dose-dependent.
文摘Objective To establish a stable and efficient method of culturing imDCs in vitro,and to explore the effect of GW5074,which blocks ERK1 /2 signal pathway in the process of immature dentritic cells ( imDCs) on inducing differentiation of the naive allogeneic CD4 + T
文摘The occurrence of massive CD4+ T cell depletion is one of the most prominent characteristics of human immunodeficiency virus type 1 (HIV-1) infection during acute phase, resulting in unrestorable destruction to the immune system. The infected host undergoes an asymptomatic period lasting several years with low viral load and ostensibly healthy status, which is presumably due to virus-specific adaptive immune responses. In the absence of therapy, an overwhelming majority of cases develop to AIDS within 8-10 years of latent infection. In this review, we discuss the roles in AIDS pathogenesis played by massive CD4+ T lymphocytes depletion in gut-associated lymphoid tissue (GALT) during acute infection and abnormal immune activation emerging in the later part of chronic phase.
文摘To evaluate and discuss two novels in vitro alternative tests which based on the 2nd and 4th event of the AOP in skin sensitization and their application in skin sensitization evaluation of cosmetics in vitro.The DSens(DSens method)and Jurkat(TCPA method)were used as the test models and 9 of reference chemicals and 12 kinds of cosmetic products were used to confirm and assess the application capability in skin sensitization.The results showed that the DSens method was more sensitive to the reference chemicals compare to the TCPA method.All the results of cosmetic products showed a high consistency between these two assays and h-CLAT or in vivo assay.As the new screening method for skin sensitization evaluation of cosmetics,the in vitro alternative tests based on AOP have certain effectiveness.The reasonable combination strategy can bring a bright future for the development and application of animal alternative test in China.
