目的检测肥胖大鼠网膜脂肪组织KLF4及KLF7 m RNA表达水平,分析其与炎症的相关性。方法 Wistar健康雄性大鼠高脂喂养,诱导肥胖模型。高脂喂养后第4、10周检测大鼠血脂、血糖水平;ELISA法测定血浆中TNF-α、LPT、APN水平;10周后,q RT-PCR...目的检测肥胖大鼠网膜脂肪组织KLF4及KLF7 m RNA表达水平,分析其与炎症的相关性。方法 Wistar健康雄性大鼠高脂喂养,诱导肥胖模型。高脂喂养后第4、10周检测大鼠血脂、血糖水平;ELISA法测定血浆中TNF-α、LPT、APN水平;10周后,q RT-PCR法检测网膜脂肪组织KLF4、KLF7及NF-κB炎症信号通路关键因子m RNA表达水平。结果高脂喂养4周后,实验组大鼠体质量开始显著高于对照组,第10周实验组大鼠体质量进入平台期,但仍高于对照组(P<0.05)。高脂喂养第4及第10周,实验组大鼠血浆FFA、Glu、TG、TC、LDL、TNF-α水平高于对照组,LPT、APN水平低于对照组(P<0.05)。网膜脂肪组织中,实验组TLR9、KLF4 m RNA表达水平低于对照组,KLF7、SRC和IL-6 m RNA表达水平高于对照组;TLR9与血浆FFA负相关,与KLF4正相关;KLF4与SRC、NF-κB负相关;KLF7与TLR4、SRC、NF-κB和IL-6正相关,与KLF4负相关(P<0.05)。结论肥胖状态下,高水平的FFA一方面可与TLR4结合上调KLF7表达,促进炎症因子表达,导致释放组织发生炎症;同时,可抑制TLR9水平而下调KLF4表达,减弱KLF4对炎症信号通路关键因子的抑制作用,从而促进炎症反应。展开更多
目的探讨KLF7高表达与前列腺癌(PCa)发生的相关性,并对其可能的下游靶基因进行筛选。方法比较前列腺增生(BPH)患者(n=22)以及PCa患者(n=30)血糖、血脂及一般资料的差异;调取石蜡包埋的前列腺组织标本,运用免疫组织化学法检测组织中KLF7...目的探讨KLF7高表达与前列腺癌(PCa)发生的相关性,并对其可能的下游靶基因进行筛选。方法比较前列腺增生(BPH)患者(n=22)以及PCa患者(n=30)血糖、血脂及一般资料的差异;调取石蜡包埋的前列腺组织标本,运用免疫组织化学法检测组织中KLF7及其下游因子IL-6,以及肿瘤发生相关因子E-钙粘蛋白、Ki67的表达量。运用统计学方法,比较各因子在BPH和PCa患者前列腺组织中的表达差异,并分析KLF7表达与各因子之间的相关性。运用Cistrome Data Browser数据库对KLF7可能的下游靶基因进行预测。结果 PCa患者血清中总前列腺特异性抗原(TPSA)含量显著高于正常体检及BPH个体(P<0.001);PCa患者前列腺组织中KLF7及IL-6表达量显著高于BPH患者前列腺组织(P<0.05),肿瘤发生相关因子Ki67表达量显著高于BPH患者前列腺组织(P<0.05),E-钙粘蛋白的表达量在两组间无显著差异。相关性分析结果显示:前列腺癌组织中KLF7的表达与患者血清中TPSA含量显著正相关(r=0.465,P=0.001),与癌组织中IL-6的表达显著正相关(r=0.437,P=0.014),与癌组织中Ki67的表达显著正相关(r=0.434,P=0.002),与癌组织中E-钙粘蛋白的表达显著正相关(r=0.473,P=0.009)。生物信息学分析结果显示:转录因子KLF7可能通过调控肿瘤相关基因STAT3,DDX20,ZNF233,ZNF581,ZNF487,ZNF580,ZNF391,ZNF793,HMGB1,DMAP1,CTNNB1,ZBTB45等参与肿瘤的发生发展。结论 KLF7高表达可能是前列腺癌发生的危险因素,前列腺癌组织中KLF7的表达与IL-6、Ki67以及E-钙粘蛋白的表达显著正相关。KLF7可能通过调控一系列肿瘤相关基因的表达参与肿瘤发生发展的过程。展开更多
目的:探讨KLF7b对斑马鱼胚胎发育的影响。方法:体外转录野生型KLF7b m RNA、KLF7b乙酰化位点突变体m RNA;设计合成特异性KLF7b反义吗啉代寡核苷酸(morpholino oligonueleitide,MO);在1~2细胞期注射到斑马鱼胚胎体内以实现KLF7b的过表达...目的:探讨KLF7b对斑马鱼胚胎发育的影响。方法:体外转录野生型KLF7b m RNA、KLF7b乙酰化位点突变体m RNA;设计合成特异性KLF7b反义吗啉代寡核苷酸(morpholino oligonueleitide,MO);在1~2细胞期注射到斑马鱼胚胎体内以实现KLF7b的过表达、位点突变与敲降;观察胚胎表型并利用定量PCR检测发育相关基因的表达变化,钙黄绿素染色观察斑马鱼骨骼发育情况。结果:过表达KLF7b对斑马鱼胚胎的发育无明显影响;敲降KLF7b或注射乙酰化位点突变的KLF7b后,斑马鱼胚胎出现心包积液、体轴和头部发育的异常,肌肉发育标志基因表达下调。结论:KLF7b可通过乙酰化修饰影响斑马鱼的发育。展开更多
A previous study has indicated that Krüppel-like factor 7（KLF7）, a transcription factor that stimulates Schwann cell（SC） proliferation and axonal regeneration after peripheral nerve injury, is a promising the...A previous study has indicated that Krüppel-like factor 7（KLF7）, a transcription factor that stimulates Schwann cell（SC） proliferation and axonal regeneration after peripheral nerve injury, is a promising therapeutic transcription factor in nerve injury. We aimed to identify whether inhibition of micro RNA-146 b（mi R-146 b）affected SC proliferation, migration, and myelinated axon regeneration following sciatic nerve injury by regulating its direct target KLF7. SCs were transfected with mi RNA lentivirus, mi RNA inhibitor lentivirus, or KLF7 si RNA lentivirus in vitro. The expression of mi R146 b and KLF7,as well as SC proliferation and migration, were subsequently evaluated. In vivo, an acellular nerve allograft（ANA） followed by injection of GFP control vector or a lentiviral vector encoding an mi R-146 b inhibitor was used to assess the repair potential in a model of sciatic nerve gap. mi R-146 b directly targeted KLF7 by binding to the 30-UTR, suppressing KLF7. Up-regulation of mi R-146 b and KLF7 knockdown significantly reduced the proliferation and migration of SCs, whereas silencing mi R-146 b resulted in increased proliferation and migration. KLF7 protein was localized in SCs in which mi R-146 b was expressed in vivo.Similarly, 4 weeks after the ANA, anti-mi R-146 b increased KLF7 and its target gene nerve growth factor cascade, promoting axonal outgrowth. Closer analysis revealed improved nerve conduction and sciatic function index score, and enhanced expression of neurofilaments, P0（anti-peripheral myelin）, and myelinated axon regeneration. Our findings provide new insight into the regulation of KLF7 by mi R-146 b during peripheral nerve regeneration and suggest a potential therapeutic strategy for peripheral nerve injury.展开更多
PU.1和KLF7基因在多个组织中的表达具有相关性。在前脂肪细胞分化过程中,两个转录因子都可以通过抑制PPARγ的表达而抑制脂肪形成。然而两者是否存在蛋白水平相互作用还不清楚。为了验证PU.1和KLF7在前脂肪细胞中的关系,该研究构建了重...PU.1和KLF7基因在多个组织中的表达具有相关性。在前脂肪细胞分化过程中,两个转录因子都可以通过抑制PPARγ的表达而抑制脂肪形成。然而两者是否存在蛋白水平相互作用还不清楚。为了验证PU.1和KLF7在前脂肪细胞中的关系,该研究构建了重组表达载体pECFP-N1-PU.1和pEYFP-N1-KLF7,并瞬时转染到3T3-L1前脂肪细胞系中。利用激光共聚焦显微镜,观察到PU.1和KLF7蛋白共定位于3T3-L1细胞核中。荧光共振能量转移(fluorescence resonance energy transfer,FRET)实验分析显示,PU.1和KLF7之间有明显的能量共振转移。实验结果证实,PU.1和KLF7之间存在直接的相互作用关系,为脂肪生成的调控机制研究提供新思路。展开更多
文摘目的检测肥胖大鼠网膜脂肪组织KLF4及KLF7 m RNA表达水平,分析其与炎症的相关性。方法 Wistar健康雄性大鼠高脂喂养,诱导肥胖模型。高脂喂养后第4、10周检测大鼠血脂、血糖水平;ELISA法测定血浆中TNF-α、LPT、APN水平;10周后,q RT-PCR法检测网膜脂肪组织KLF4、KLF7及NF-κB炎症信号通路关键因子m RNA表达水平。结果高脂喂养4周后,实验组大鼠体质量开始显著高于对照组,第10周实验组大鼠体质量进入平台期,但仍高于对照组(P<0.05)。高脂喂养第4及第10周,实验组大鼠血浆FFA、Glu、TG、TC、LDL、TNF-α水平高于对照组,LPT、APN水平低于对照组(P<0.05)。网膜脂肪组织中,实验组TLR9、KLF4 m RNA表达水平低于对照组,KLF7、SRC和IL-6 m RNA表达水平高于对照组;TLR9与血浆FFA负相关,与KLF4正相关;KLF4与SRC、NF-κB负相关;KLF7与TLR4、SRC、NF-κB和IL-6正相关,与KLF4负相关(P<0.05)。结论肥胖状态下,高水平的FFA一方面可与TLR4结合上调KLF7表达,促进炎症因子表达,导致释放组织发生炎症;同时,可抑制TLR9水平而下调KLF4表达,减弱KLF4对炎症信号通路关键因子的抑制作用,从而促进炎症反应。
文摘目的探讨KLF7高表达与前列腺癌(PCa)发生的相关性,并对其可能的下游靶基因进行筛选。方法比较前列腺增生(BPH)患者(n=22)以及PCa患者(n=30)血糖、血脂及一般资料的差异;调取石蜡包埋的前列腺组织标本,运用免疫组织化学法检测组织中KLF7及其下游因子IL-6,以及肿瘤发生相关因子E-钙粘蛋白、Ki67的表达量。运用统计学方法,比较各因子在BPH和PCa患者前列腺组织中的表达差异,并分析KLF7表达与各因子之间的相关性。运用Cistrome Data Browser数据库对KLF7可能的下游靶基因进行预测。结果 PCa患者血清中总前列腺特异性抗原(TPSA)含量显著高于正常体检及BPH个体(P<0.001);PCa患者前列腺组织中KLF7及IL-6表达量显著高于BPH患者前列腺组织(P<0.05),肿瘤发生相关因子Ki67表达量显著高于BPH患者前列腺组织(P<0.05),E-钙粘蛋白的表达量在两组间无显著差异。相关性分析结果显示:前列腺癌组织中KLF7的表达与患者血清中TPSA含量显著正相关(r=0.465,P=0.001),与癌组织中IL-6的表达显著正相关(r=0.437,P=0.014),与癌组织中Ki67的表达显著正相关(r=0.434,P=0.002),与癌组织中E-钙粘蛋白的表达显著正相关(r=0.473,P=0.009)。生物信息学分析结果显示:转录因子KLF7可能通过调控肿瘤相关基因STAT3,DDX20,ZNF233,ZNF581,ZNF487,ZNF580,ZNF391,ZNF793,HMGB1,DMAP1,CTNNB1,ZBTB45等参与肿瘤的发生发展。结论 KLF7高表达可能是前列腺癌发生的危险因素,前列腺癌组织中KLF7的表达与IL-6、Ki67以及E-钙粘蛋白的表达显著正相关。KLF7可能通过调控一系列肿瘤相关基因的表达参与肿瘤发生发展的过程。
文摘目的:探讨KLF7b对斑马鱼胚胎发育的影响。方法:体外转录野生型KLF7b m RNA、KLF7b乙酰化位点突变体m RNA;设计合成特异性KLF7b反义吗啉代寡核苷酸(morpholino oligonueleitide,MO);在1~2细胞期注射到斑马鱼胚胎体内以实现KLF7b的过表达、位点突变与敲降;观察胚胎表型并利用定量PCR检测发育相关基因的表达变化,钙黄绿素染色观察斑马鱼骨骼发育情况。结果:过表达KLF7b对斑马鱼胚胎的发育无明显影响;敲降KLF7b或注射乙酰化位点突变的KLF7b后,斑马鱼胚胎出现心包积液、体轴和头部发育的异常,肌肉发育标志基因表达下调。结论:KLF7b可通过乙酰化修饰影响斑马鱼的发育。
基金supported by the National Natural Science Foundation of China (81371362, 81641125, and 81500629)the Scientific Research Foundation of Heilongjiang Province, China (LC2017040)+1 种基金the Science Fund of Heilongjiang Provincial Health and Family Planning Commission, China (2016357 and 2016385)the Basic Research Operating Expenses Program of Heilongjiang Provincial Universities, China (2017- KYYWFMY0661)
文摘A previous study has indicated that Krüppel-like factor 7（KLF7）, a transcription factor that stimulates Schwann cell（SC） proliferation and axonal regeneration after peripheral nerve injury, is a promising therapeutic transcription factor in nerve injury. We aimed to identify whether inhibition of micro RNA-146 b（mi R-146 b）affected SC proliferation, migration, and myelinated axon regeneration following sciatic nerve injury by regulating its direct target KLF7. SCs were transfected with mi RNA lentivirus, mi RNA inhibitor lentivirus, or KLF7 si RNA lentivirus in vitro. The expression of mi R146 b and KLF7,as well as SC proliferation and migration, were subsequently evaluated. In vivo, an acellular nerve allograft（ANA） followed by injection of GFP control vector or a lentiviral vector encoding an mi R-146 b inhibitor was used to assess the repair potential in a model of sciatic nerve gap. mi R-146 b directly targeted KLF7 by binding to the 30-UTR, suppressing KLF7. Up-regulation of mi R-146 b and KLF7 knockdown significantly reduced the proliferation and migration of SCs, whereas silencing mi R-146 b resulted in increased proliferation and migration. KLF7 protein was localized in SCs in which mi R-146 b was expressed in vivo.Similarly, 4 weeks after the ANA, anti-mi R-146 b increased KLF7 and its target gene nerve growth factor cascade, promoting axonal outgrowth. Closer analysis revealed improved nerve conduction and sciatic function index score, and enhanced expression of neurofilaments, P0（anti-peripheral myelin）, and myelinated axon regeneration. Our findings provide new insight into the regulation of KLF7 by mi R-146 b during peripheral nerve regeneration and suggest a potential therapeutic strategy for peripheral nerve injury.
文摘PU.1和KLF7基因在多个组织中的表达具有相关性。在前脂肪细胞分化过程中,两个转录因子都可以通过抑制PPARγ的表达而抑制脂肪形成。然而两者是否存在蛋白水平相互作用还不清楚。为了验证PU.1和KLF7在前脂肪细胞中的关系,该研究构建了重组表达载体pECFP-N1-PU.1和pEYFP-N1-KLF7,并瞬时转染到3T3-L1前脂肪细胞系中。利用激光共聚焦显微镜,观察到PU.1和KLF7蛋白共定位于3T3-L1细胞核中。荧光共振能量转移(fluorescence resonance energy transfer,FRET)实验分析显示,PU.1和KLF7之间有明显的能量共振转移。实验结果证实,PU.1和KLF7之间存在直接的相互作用关系,为脂肪生成的调控机制研究提供新思路。
