目的利用RNA干涉技术诱导角蛋白17(K17)基因沉默,观察其对角质形成细胞(KC)增生和凋亡等生物学活性的影响。方法合成两条含有针对人K17mRNA序列的正义和反义寡核苷酸,退火后与表达载体psilencer3.1-H1neo相连接,经鉴定后转染人角质形成...目的利用RNA干涉技术诱导角蛋白17(K17)基因沉默,观察其对角质形成细胞(KC)增生和凋亡等生物学活性的影响。方法合成两条含有针对人K17mRNA序列的正义和反义寡核苷酸,退火后与表达载体psilencer3.1-H1neo相连接,经鉴定后转染人角质形成细胞系HaCaT,分别以逆转录聚合酶链反应(RT-PCR)和免疫印迹法(W est-ern b lot)检测转染细胞K17 mRNA与蛋白水平的改变,用流式细胞仪检测转染细胞的细胞周期及凋亡情况,并通过透射电镜观察细胞的凋亡。结果成功构建了靶向人K17基因的siRNA表达载体psilencer3.1/K17,检测到瞬时转染的HaCaT细胞中K17的蛋白水平及mRNA水平均明显下降。流式细胞仪检测表明转染细胞的细胞周期发生了明显的G1期阻滞并证实凋亡的存在,电镜下观察到凋亡小体。结论对于增生活跃的角质形成细胞,K17的表达对其增生、分化和凋亡等生物学活性具有重要影响。靶向K17的siRNA能够抑制角质形成细胞增生,诱导其凋亡。展开更多
目的观察白细胞介素-17A(IL-17A)对体外培养的人永生化角质形成细胞(Ha Ca T)角蛋白17(K17)表达及信号转导和转录激活因子3(STAT3)信号通路的影响。方法采用RPMI1640培养液培养Ha Ca T细胞,将细胞随机分为空白对照组、诱导组、抑制剂组...目的观察白细胞介素-17A(IL-17A)对体外培养的人永生化角质形成细胞(Ha Ca T)角蛋白17(K17)表达及信号转导和转录激活因子3(STAT3)信号通路的影响。方法采用RPMI1640培养液培养Ha Ca T细胞,将细胞随机分为空白对照组、诱导组、抑制剂组,空白对照组仅加DMEM高糖培养基,诱导组加入含50μg/L IL-17A的DMEM高糖培养基,抑制剂组加入含50μg/L IL-17A的DMEM高糖培养基和10μmol/L STAT3抑制剂Piceatannol。收集培养的Ha Ca T细胞,采用MTT比色法检测细胞增殖情况,流式细胞术检测细胞凋亡率,RT-PCR法检测细胞K17 mRNA表达水平,Western blotting法检测细胞K17和磷酸化STAT3(p-STAT3)蛋白表达水平。结果诱导组细胞增殖A值高于空白对照组和抑制剂组,细胞凋亡率低于空白对照组和抑制剂组(P均<0.01);诱导组K17mRNA及K17、p-STAT3蛋白相对表达量均高于空白对照组和抑制剂组(P均<0.01)。结论 IL-17A能够上调体外培养的Ha Ca T细胞K17表达,其调控机制可能是通过激活STAT3来实现,表明IL-17A在银屑病中发挥的作用可能与K17有关。展开更多
Background: Identification of critical autoantigenic T-cell epitopes is key to developing antigen-based therapies for autoimmune diseases, including psoriasis. Our previous work demonstrated that 3 peptides on keratin...Background: Identification of critical autoantigenic T-cell epitopes is key to developing antigen-based therapies for autoimmune diseases, including psoriasis. Our previous work demonstrated that 3 peptides on keratin 17 are able to stimulate peripheral blood lymphocytes of HLA-DRB1 07-positive patients with psoriasis and to serve as immunodominant T cell epitopes. Objective: We sought to determine antagonistic altered peptide ligands to psoriatic T cells with a down-modulatory effect in inhibiting keratinocyte proliferation. Methods: Psoriatic altered peptide ligands were generated by single alanine residue substitutions at a critical T-cell receptor contact residue position. Antagonistic altered peptide ligands were identified by suppression screening of psoriatic T-cell activation and keratinocyte proliferation. Results: Altered peptide ligands 119R and 355L can inhibit psoriatic T-cell activation more effectively than other altered peptide ligands, especially 355L, with inhibition of T-cell proliferation and the secretion of interferon gamma and interleukin 2 in parallel with the upregulation of interleukins 4 and 10 as well as transforming growth factor-β . In coincubation assay, altered peptide ligands 119R and 355L can down-regulate the function of psoriatic T cells more effectively than wild-type epitopes solely, but less effectively than altered peptide ligands solely. In prepulse assay altered peptide ligand 119R can down-regulate the activation of psoriatic T cells more effectively than in coincubation but less effectively as compared with altered peptide ligand 119R only. Altered peptide ligand 355L was also shown to have a similar presentation. T-cell culture supernatants (1:100) from the concentrations (10 μ g · mL-1 and 100 μ g · mL-1 with 119R, 100 μ g · mL-1 with 355L) were more effective than the other ratios in inhibiting keratinocyte proliferation. Limitations: This study had a relatively small sample size (52 patients and 48 healthy controls). Conclusion: Our findings show that the altered peptide ligands 119R (VAALEEANTELEVKI) and 355L (ENRYCVQASQIQGLI) are capable of inhibiting proliferative responses of psoriatic T cells and keratinocyte proliferation in vitro, at least, with enhanced helper T cell type 2 polarization. Thus, to our knowledge, this article is the first report of the demonstration of therapeutic activity of altered peptide ligands derived from keratin 17.展开更多
文摘目的利用RNA干涉技术诱导角蛋白17(K17)基因沉默,观察其对角质形成细胞(KC)增生和凋亡等生物学活性的影响。方法合成两条含有针对人K17mRNA序列的正义和反义寡核苷酸,退火后与表达载体psilencer3.1-H1neo相连接,经鉴定后转染人角质形成细胞系HaCaT,分别以逆转录聚合酶链反应(RT-PCR)和免疫印迹法(W est-ern b lot)检测转染细胞K17 mRNA与蛋白水平的改变,用流式细胞仪检测转染细胞的细胞周期及凋亡情况,并通过透射电镜观察细胞的凋亡。结果成功构建了靶向人K17基因的siRNA表达载体psilencer3.1/K17,检测到瞬时转染的HaCaT细胞中K17的蛋白水平及mRNA水平均明显下降。流式细胞仪检测表明转染细胞的细胞周期发生了明显的G1期阻滞并证实凋亡的存在,电镜下观察到凋亡小体。结论对于增生活跃的角质形成细胞,K17的表达对其增生、分化和凋亡等生物学活性具有重要影响。靶向K17的siRNA能够抑制角质形成细胞增生,诱导其凋亡。
文摘目的观察白细胞介素-17A(IL-17A)对体外培养的人永生化角质形成细胞(Ha Ca T)角蛋白17(K17)表达及信号转导和转录激活因子3(STAT3)信号通路的影响。方法采用RPMI1640培养液培养Ha Ca T细胞,将细胞随机分为空白对照组、诱导组、抑制剂组,空白对照组仅加DMEM高糖培养基,诱导组加入含50μg/L IL-17A的DMEM高糖培养基,抑制剂组加入含50μg/L IL-17A的DMEM高糖培养基和10μmol/L STAT3抑制剂Piceatannol。收集培养的Ha Ca T细胞,采用MTT比色法检测细胞增殖情况,流式细胞术检测细胞凋亡率,RT-PCR法检测细胞K17 mRNA表达水平,Western blotting法检测细胞K17和磷酸化STAT3(p-STAT3)蛋白表达水平。结果诱导组细胞增殖A值高于空白对照组和抑制剂组,细胞凋亡率低于空白对照组和抑制剂组(P均<0.01);诱导组K17mRNA及K17、p-STAT3蛋白相对表达量均高于空白对照组和抑制剂组(P均<0.01)。结论 IL-17A能够上调体外培养的Ha Ca T细胞K17表达,其调控机制可能是通过激活STAT3来实现,表明IL-17A在银屑病中发挥的作用可能与K17有关。
文摘Background: Identification of critical autoantigenic T-cell epitopes is key to developing antigen-based therapies for autoimmune diseases, including psoriasis. Our previous work demonstrated that 3 peptides on keratin 17 are able to stimulate peripheral blood lymphocytes of HLA-DRB1 07-positive patients with psoriasis and to serve as immunodominant T cell epitopes. Objective: We sought to determine antagonistic altered peptide ligands to psoriatic T cells with a down-modulatory effect in inhibiting keratinocyte proliferation. Methods: Psoriatic altered peptide ligands were generated by single alanine residue substitutions at a critical T-cell receptor contact residue position. Antagonistic altered peptide ligands were identified by suppression screening of psoriatic T-cell activation and keratinocyte proliferation. Results: Altered peptide ligands 119R and 355L can inhibit psoriatic T-cell activation more effectively than other altered peptide ligands, especially 355L, with inhibition of T-cell proliferation and the secretion of interferon gamma and interleukin 2 in parallel with the upregulation of interleukins 4 and 10 as well as transforming growth factor-β . In coincubation assay, altered peptide ligands 119R and 355L can down-regulate the function of psoriatic T cells more effectively than wild-type epitopes solely, but less effectively than altered peptide ligands solely. In prepulse assay altered peptide ligand 119R can down-regulate the activation of psoriatic T cells more effectively than in coincubation but less effectively as compared with altered peptide ligand 119R only. Altered peptide ligand 355L was also shown to have a similar presentation. T-cell culture supernatants (1:100) from the concentrations (10 μ g · mL-1 and 100 μ g · mL-1 with 119R, 100 μ g · mL-1 with 355L) were more effective than the other ratios in inhibiting keratinocyte proliferation. Limitations: This study had a relatively small sample size (52 patients and 48 healthy controls). Conclusion: Our findings show that the altered peptide ligands 119R (VAALEEANTELEVKI) and 355L (ENRYCVQASQIQGLI) are capable of inhibiting proliferative responses of psoriatic T cells and keratinocyte proliferation in vitro, at least, with enhanced helper T cell type 2 polarization. Thus, to our knowledge, this article is the first report of the demonstration of therapeutic activity of altered peptide ligands derived from keratin 17.
