白介素-22(interleukin-22,IL-22)是IL-10家族成员之一,主要是由Th22细胞分泌的细胞因子,与特异性表达I L-22受体的组织细胞相结合,进而激活信号传导与转录激活因子3(signal transducer and activator of transcription 3,STAT3)通路发...白介素-22(interleukin-22,IL-22)是IL-10家族成员之一,主要是由Th22细胞分泌的细胞因子,与特异性表达I L-22受体的组织细胞相结合,进而激活信号传导与转录激活因子3(signal transducer and activator of transcription 3,STAT3)通路发挥其生物学作用.同时,STAT3通路也是IL-22在肝损伤发生发展中主要影响作用途径.IL-22对不同类型的肝损伤疾病发挥保肝作用或加重肝损伤程度.因此,本文将IL-22激活STAT3通路作用于肝损伤疾病机制进行综述,将有利于开拓新的治疗靶点.展开更多
目的:研究肠三叶因子(intestinal trefoil factor,ITF)对自身启动子活性的影响及Janus激酶/信号转导和转录激活因子(Janus kinase/signal transducers and activators of transcription,JAK/STAT)信号通路对其的调控作用。方法:以人全...目的:研究肠三叶因子(intestinal trefoil factor,ITF)对自身启动子活性的影响及Janus激酶/信号转导和转录激活因子(Janus kinase/signal transducers and activators of transcription,JAK/STAT)信号通路对其的调控作用。方法:以人全血基因组DNA为模板,PCR获取ITF基因5'侧翼序列,插入p GL3-Basic载体,构建ITF启动子重组载体;以不同浓度的ITF刺激,检测双荧光素酶的活性;运用JAK-STAT3通路特异性抑制剂AG490阻断JAKSTAT3信号通路,观察AG490对ITF启动子活性的影响。结果:酶切和直接测序法证实包含ITF启动子的重组质粒构建成功;瞬时转染实验显示,ITF能显著提高ITF启动子的活性(P<0.05);加入AG490后ITF启动子活性显著下降(P<0.05)。结论:ITF通过JAK-STAT3途径上调自身启动子的活性。展开更多
Recent studies regarding neuronal differentiation of mesenchymal stem cells （MSCs） have primarily focused on induction methods and transplantation in vivo. However, knowledge about the intrinsic regulatory mechanism...Recent studies regarding neuronal differentiation of mesenchymal stem cells （MSCs） have primarily focused on induction methods and transplantation in vivo. However, knowledge about the intrinsic regulatory mechanisms underlying neuronal induction of MSCs remains limited and unclear. OBJECTIVE： To elucidate the role of JAK-STAT3 signaling pathway during neuronal differentiation of MSCs using a combination of the JAK-STAT3 signaling inhibitor AG490 and growth factors. DESIGN, TIME AND SETTING： Neural, molecular, biomedical, in vitro experiment was performed at the Laboratory of Pharmacology, School of Pharmacy, Nanjing Medical University between March and December 2008 MATERIALS： An inhibitor of the JAK-STAT3 signaling pathway was purchased from Calbiochem, USA. Antibody kit for total and phosphorylated STAT3 was purchased from Cell Signaling, USA. METHODS： MSCs from passage 3 were assigned to non-induced, growth factor, and AG490 groups. MAIN OUTCOME MEASURE： The number of cells expressing neuron-specific enolase, microtubule-associated protein, and glial fibrillary acidic protein were determined by immunocytochemistry. Total and phosphorylated （Tyr705） expression levels of STAT3 protein were measured by Western blot analysis. RESULTS： MSCs were transdifferentiated into neuronal- and astrocyte-like phenotypes through the induction of epidermal growth factor, basic fibroblast growth factor, and brain-derived neurotrophic factor. In addition, the JAK-STAT3 signaling pathway was significantly activated during neural differentiation. Expression of phosphorylated （Tyr705） STAT3 was inhibited with AG490 （5 pmol/L） prior to neural induction with epidermal growth factor, basic fibroblast growth factor, and brain-derived neurotrophic factor; proportion of astrocyte-like cells was significantly reduced （P 〈 0.01）, and the proportion of neuronal-like phenotypes was significantly increased （P〈 0.01）. CONCLUSION： JAK-STAT3 signaling pathway was shown to regulate neuronal induction of bone marrow MSCs. The proportion of MSC-induced neuronal-like cells was increased following treatment with the JAK-STAT3 signaling inhibitor AG490.展开更多
目的研究氯化锂(lithium chloride,LiCl)干预对双侧卵巢切除(ovariectomized,OVX)小鼠骨丢失、Janus激酶/信号转导与转录激活子(The janus kinase/signal transducer and activator of tran-ions,JAK/STAT)信号通路及成骨细胞(osteoblas...目的研究氯化锂(lithium chloride,LiCl)干预对双侧卵巢切除(ovariectomized,OVX)小鼠骨丢失、Janus激酶/信号转导与转录激活子(The janus kinase/signal transducer and activator of tran-ions,JAK/STAT)信号通路及成骨细胞(osteoblast,OB)的影响。方法体内实验:选取8周龄雌性C57BL6/J小鼠24只,分为假手术组(Sham组),OVX组和卵巢切除+氯化锂干预(OVX+LiCl)组。收集动物左右侧股骨及右侧胫骨标本,进行Micro-CT、免疫组织化学和骨生物力学测试。体外实验:处死3日龄C57BL/6小鼠,分离颅骨培养原代OB,分为空白对照组(Control组)和LiCl组进行细胞活性检测、碱性磷酸酶染色、茜素红染色、实时荧光定量PCR检测。结果Micro-CT分析示OVX组骨量减少,骨小梁厚度变薄,骨小梁数量减少,骨小梁分离度增加,LiCl干预显著改善骨丢失。生物力学示OVX组的最大载荷、最大应力均显著低于Sham组(P<0.05),OVX+LiCl组的最大载荷、最大应力较OVX组显著升高(P<0.05)。免疫组化结果示,OVX+LiCl组JAK2和STAT3表达显著高于Sham组(P<0.05);OVX组P-STAT3表达明显低于Sham组(P<0.05),而OVX+LiCl组表达显著升高(P<0.05)。LiCl组的OB增殖活性显著高于对照组(P<0.05)。LiCl组的碱性磷酸酶活性和钙结节数量显著高于OVX组(P<0.05)。LiCl组STAT3 mRNA和OCN mRNA表达显著高于对照组(P<0.05)。结论LiCl通过调控OB改善OVX小鼠骨量和骨微结构,其机制可能与调节JAK/STAT3信号通路有关。展开更多
文摘白介素-22(interleukin-22,IL-22)是IL-10家族成员之一,主要是由Th22细胞分泌的细胞因子,与特异性表达I L-22受体的组织细胞相结合,进而激活信号传导与转录激活因子3(signal transducer and activator of transcription 3,STAT3)通路发挥其生物学作用.同时,STAT3通路也是IL-22在肝损伤发生发展中主要影响作用途径.IL-22对不同类型的肝损伤疾病发挥保肝作用或加重肝损伤程度.因此,本文将IL-22激活STAT3通路作用于肝损伤疾病机制进行综述,将有利于开拓新的治疗靶点.
文摘目的:研究肠三叶因子(intestinal trefoil factor,ITF)对自身启动子活性的影响及Janus激酶/信号转导和转录激活因子(Janus kinase/signal transducers and activators of transcription,JAK/STAT)信号通路对其的调控作用。方法:以人全血基因组DNA为模板,PCR获取ITF基因5'侧翼序列,插入p GL3-Basic载体,构建ITF启动子重组载体;以不同浓度的ITF刺激,检测双荧光素酶的活性;运用JAK-STAT3通路特异性抑制剂AG490阻断JAKSTAT3信号通路,观察AG490对ITF启动子活性的影响。结果:酶切和直接测序法证实包含ITF启动子的重组质粒构建成功;瞬时转染实验显示,ITF能显著提高ITF启动子的活性(P<0.05);加入AG490后ITF启动子活性显著下降(P<0.05)。结论:ITF通过JAK-STAT3途径上调自身启动子的活性。
基金the National Nature Science Foundation of China, No. 30973092"Xingwei" Project Medical Emphasis Grant from Jiangsu Province, No. RC2007062
文摘Recent studies regarding neuronal differentiation of mesenchymal stem cells （MSCs） have primarily focused on induction methods and transplantation in vivo. However, knowledge about the intrinsic regulatory mechanisms underlying neuronal induction of MSCs remains limited and unclear. OBJECTIVE： To elucidate the role of JAK-STAT3 signaling pathway during neuronal differentiation of MSCs using a combination of the JAK-STAT3 signaling inhibitor AG490 and growth factors. DESIGN, TIME AND SETTING： Neural, molecular, biomedical, in vitro experiment was performed at the Laboratory of Pharmacology, School of Pharmacy, Nanjing Medical University between March and December 2008 MATERIALS： An inhibitor of the JAK-STAT3 signaling pathway was purchased from Calbiochem, USA. Antibody kit for total and phosphorylated STAT3 was purchased from Cell Signaling, USA. METHODS： MSCs from passage 3 were assigned to non-induced, growth factor, and AG490 groups. MAIN OUTCOME MEASURE： The number of cells expressing neuron-specific enolase, microtubule-associated protein, and glial fibrillary acidic protein were determined by immunocytochemistry. Total and phosphorylated （Tyr705） expression levels of STAT3 protein were measured by Western blot analysis. RESULTS： MSCs were transdifferentiated into neuronal- and astrocyte-like phenotypes through the induction of epidermal growth factor, basic fibroblast growth factor, and brain-derived neurotrophic factor. In addition, the JAK-STAT3 signaling pathway was significantly activated during neural differentiation. Expression of phosphorylated （Tyr705） STAT3 was inhibited with AG490 （5 pmol/L） prior to neural induction with epidermal growth factor, basic fibroblast growth factor, and brain-derived neurotrophic factor; proportion of astrocyte-like cells was significantly reduced （P 〈 0.01）, and the proportion of neuronal-like phenotypes was significantly increased （P〈 0.01）. CONCLUSION： JAK-STAT3 signaling pathway was shown to regulate neuronal induction of bone marrow MSCs. The proportion of MSC-induced neuronal-like cells was increased following treatment with the JAK-STAT3 signaling inhibitor AG490.
