Identification and enumeration of both dendritic Ia^+ epi-dermal cells (Ia^+DECs) and dendritic Thy-1^+ epidermalcells (Thy-1^+DECa) from various parts of the body wereexamined by using epidermal sheets of C3H/He inbr...Identification and enumeration of both dendritic Ia^+ epi-dermal cells (Ia^+DECs) and dendritic Thy-1^+ epidermalcells (Thy-1^+DECa) from various parts of the body wereexamined by using epidermal sheets of C3H/He inbred miceof different age groups and indirect immunofluorescent tech-nique. A significant decline of both Ia^+DECs and Thy-1^+DECs in the mice of the aged group was demonstrated anddifferent densities and different distribution patterns betweenIa^+DECs and Thy-1^+DECs were obserged. These findingsmay imply that the decline of both Ia^+DECs and Thy-1^+DECs in the aged group may reflect the alterations of im-mune response in aging.展开更多
The precise mechanism underlying the effects of anti-CD4 antibody and calcium ions(Ca^(2+)) in peanut allergy remains unknown.C3 H/HeJ mice sensitized with peanut protein extract(PPE)were injected with anti-CD4 antibo...The precise mechanism underlying the effects of anti-CD4 antibody and calcium ions(Ca^(2+)) in peanut allergy remains unknown.C3 H/HeJ mice sensitized with peanut protein extract(PPE)were injected with anti-CD4 antibodies for 4 weeks.Stimulation with PPE increased the specific immunoglobulin E(IgE),cytokine,histamine,and mMcp-1 levels,upregulated decorin(Dcn)expression,induced Ca^(2+) inflow in the spleen,and augmented the expression of the transcription factors GATA-3 and Foxp3,which resulted in Th2 and Treg cell activation.Notably,the Ca^(2+) levels were positively correlated with the histamine,interleukin(IL)-4,IL-5,and IL-13 levels,and negatively correlated with IL-10 levels.However,administration of anti-CD4 antibodies markedly alleviated allergic symptoms,activated T cells,and reduced Ca^(2+) inflow,cytokine,histamine,mMcp-1,and the IgHG3,CXCLI2,MMP2 and FABP4 gene.Our results indicated that anti-CD4 antibodies can ameliorate PPE-induced allergy,which is probably related to the suppression of Ca^(2+) inflow,and inhibiting histamine,cytokine and IgHG3,CXCL12,MMP2,and FABP4,thus exerting a protective effect against PPEsensitized food allergy.展开更多
本文旨在探究富含天冬氨酸尾1的单通道膜蛋白(Single-pass Membrane Protein With Aspartate Rich Tail1,Smdt1)对C3H10T1/2细胞增殖和成脂分化的调控效应。本研究将Smdt1基因的过表达和干扰载体转染至C3H10T1/2细胞模型,采用qPCR方法...本文旨在探究富含天冬氨酸尾1的单通道膜蛋白(Single-pass Membrane Protein With Aspartate Rich Tail1,Smdt1)对C3H10T1/2细胞增殖和成脂分化的调控效应。本研究将Smdt1基因的过表达和干扰载体转染至C3H10T1/2细胞模型,采用qPCR方法量化了增殖和成脂分化关键基因的表达水平变化,利用EdU染色检测细胞增殖活力,油红O染色方法鉴定脂滴积累的状态;进一步通过String database、Bio GRID、Int Act、GeneMANIA、DAVID和Genecard数据库构建Smdt1蛋白互作网络图。结果显示,在C3H10T1/2细胞中过表达Smdt1,极显著提升了增殖标志基因Pcna、Ki67、Cdk1及Cdk4的表达,EdU阳性细胞比例反映了细胞增殖速率加快;Smdt1极显著促进成脂分化关键基因Pparγ、Fabp4、-Adipoq的表达量,显著促进了Cebpα、Cebpβ的表达量,脂滴数量变多。在C3H10T1/2细胞体系中,干扰Smdt1,与增殖紧密相关的标志基因,包括Ki67、Pcna及Cdk1,其表达水平极显著降低,Cdk4的表达也呈现显著降低的趋势,反映在EdU增殖检测中,阳性细胞数量明显减少,细胞增殖活性受到抑制。进一步干扰Smdt1后,成脂分化途径的关键调控基因Cebpα、Pparγ、Cebpβ、Fabp4、Adipoq的表达均极显著降低,细胞内脂滴的数量也显著减少,细胞成脂分化能力削弱。蛋白功能预测发现,Smdt1能够与Mcu相互作用,参与线粒体钙离子转运、摄取和稳态。本研究发现Smdt1可以促进C3H10T1/2细胞增殖和成脂分化,为脂肪沉积的研究提供了新的方向。展开更多
文摘Identification and enumeration of both dendritic Ia^+ epi-dermal cells (Ia^+DECs) and dendritic Thy-1^+ epidermalcells (Thy-1^+DECa) from various parts of the body wereexamined by using epidermal sheets of C3H/He inbred miceof different age groups and indirect immunofluorescent tech-nique. A significant decline of both Ia^+DECs and Thy-1^+DECs in the mice of the aged group was demonstrated anddifferent densities and different distribution patterns betweenIa^+DECs and Thy-1^+DECs were obserged. These findingsmay imply that the decline of both Ia^+DECs and Thy-1^+DECs in the aged group may reflect the alterations of im-mune response in aging.
基金supported by the National Natural Science Foundation of China(31972185)。
文摘The precise mechanism underlying the effects of anti-CD4 antibody and calcium ions(Ca^(2+)) in peanut allergy remains unknown.C3 H/HeJ mice sensitized with peanut protein extract(PPE)were injected with anti-CD4 antibodies for 4 weeks.Stimulation with PPE increased the specific immunoglobulin E(IgE),cytokine,histamine,and mMcp-1 levels,upregulated decorin(Dcn)expression,induced Ca^(2+) inflow in the spleen,and augmented the expression of the transcription factors GATA-3 and Foxp3,which resulted in Th2 and Treg cell activation.Notably,the Ca^(2+) levels were positively correlated with the histamine,interleukin(IL)-4,IL-5,and IL-13 levels,and negatively correlated with IL-10 levels.However,administration of anti-CD4 antibodies markedly alleviated allergic symptoms,activated T cells,and reduced Ca^(2+) inflow,cytokine,histamine,mMcp-1,and the IgHG3,CXCLI2,MMP2 and FABP4 gene.Our results indicated that anti-CD4 antibodies can ameliorate PPE-induced allergy,which is probably related to the suppression of Ca^(2+) inflow,and inhibiting histamine,cytokine and IgHG3,CXCL12,MMP2,and FABP4,thus exerting a protective effect against PPEsensitized food allergy.
文摘本文旨在探究富含天冬氨酸尾1的单通道膜蛋白(Single-pass Membrane Protein With Aspartate Rich Tail1,Smdt1)对C3H10T1/2细胞增殖和成脂分化的调控效应。本研究将Smdt1基因的过表达和干扰载体转染至C3H10T1/2细胞模型,采用qPCR方法量化了增殖和成脂分化关键基因的表达水平变化,利用EdU染色检测细胞增殖活力,油红O染色方法鉴定脂滴积累的状态;进一步通过String database、Bio GRID、Int Act、GeneMANIA、DAVID和Genecard数据库构建Smdt1蛋白互作网络图。结果显示,在C3H10T1/2细胞中过表达Smdt1,极显著提升了增殖标志基因Pcna、Ki67、Cdk1及Cdk4的表达,EdU阳性细胞比例反映了细胞增殖速率加快;Smdt1极显著促进成脂分化关键基因Pparγ、Fabp4、-Adipoq的表达量,显著促进了Cebpα、Cebpβ的表达量,脂滴数量变多。在C3H10T1/2细胞体系中,干扰Smdt1,与增殖紧密相关的标志基因,包括Ki67、Pcna及Cdk1,其表达水平极显著降低,Cdk4的表达也呈现显著降低的趋势,反映在EdU增殖检测中,阳性细胞数量明显减少,细胞增殖活性受到抑制。进一步干扰Smdt1后,成脂分化途径的关键调控基因Cebpα、Pparγ、Cebpβ、Fabp4、Adipoq的表达均极显著降低,细胞内脂滴的数量也显著减少,细胞成脂分化能力削弱。蛋白功能预测发现,Smdt1能够与Mcu相互作用,参与线粒体钙离子转运、摄取和稳态。本研究发现Smdt1可以促进C3H10T1/2细胞增殖和成脂分化,为脂肪沉积的研究提供了新的方向。
