目的对比观察不同剂量四氯化碳(CCl_4)诱导小鼠肝纤维化模型的效果,探索一种稳定可行且较为高效的肝纤维化小鼠造模方法。方法将60只C57BL/6J小鼠随机分为正常组和模型组,模型组小鼠分别腹腔注射体积分数10%的CCl4(5 mL/kg)以及体积分数...目的对比观察不同剂量四氯化碳(CCl_4)诱导小鼠肝纤维化模型的效果,探索一种稳定可行且较为高效的肝纤维化小鼠造模方法。方法将60只C57BL/6J小鼠随机分为正常组和模型组,模型组小鼠分别腹腔注射体积分数10%的CCl4(5 mL/kg)以及体积分数20%的CCl_4(1 mL/kg),每周2次,连续8周。分别在造模2周、4周、6周、8周注射后处死小鼠,进行HE染色和Masson染色,检测血清丙氨酸转氨酶(ALT)和天冬氨酸转氨酶(AST)水平,以及肝匀浆氧化/抗氧化指标,丙二醛(MDA)、谷胱甘肽过氧化物酶(GSH)和超氧化物岐化酶(SOD)变化,Western blotting法检测肝组织中胶原表达情况。结果随着造模时间的延长,病理染色显示肝纤维化程度不断加重,胶原表达逐步增加,血清ALT、AST水平逐渐升高,肝匀浆SOD、GSH活性降低,氧化产物MDA含量升高。在造模的相同时间点,体积分数10%CCl_4、5 m L/kg剂量组相比于体积分数20%CCl4、1 m L/kg剂量组,病理染色显示肝纤维化程度更加严重,血清ALT、AST水平明显升高,肝脏中SOD、GSH活性明显降低,氧化产物MDA含量明显升高,肝纤维化形成的时间更短,效果更好。结论两种造模方法都能形成肝纤维化小鼠模型,但体积分数10%CCl_4(5 m L/kg)剂量组的纤维化形成时间更短且效果更好。因此,每周2次,连续8周腹腔注射10%CCl_4(5 m L/kg)可作为一种较为理想的纤维化小鼠造模方法。展开更多
由cAMP激活的交换蛋白分子(exchange protein activated by c AMP,Epac)是近年来新发现的鸟嘌呤核苷酸交换因子,参与一系列cAMP介导的信号通路。纤维化疾病是临床上常见的一类疾病,是在正常生理学(如衰老)或不同致病因素持续刺激下,使...由cAMP激活的交换蛋白分子(exchange protein activated by c AMP,Epac)是近年来新发现的鸟嘌呤核苷酸交换因子,参与一系列cAMP介导的信号通路。纤维化疾病是临床上常见的一类疾病,是在正常生理学(如衰老)或不同致病因素持续刺激下,使得细胞外基质过度沉积的结果。有研究表明,Epac在纤维化疾病中发挥重要作用,因此,该文对Epac在纤维化疾病中的作用进行综述,以促进对于Epac相关机制及药物的研究与开发。展开更多
OBJECTIVE To investigate the role and mechanism of G protein-coupled receptor kinase 2(GRK2)involving in hepatocel ular carcinoma(HCC)progression.METHODS Cel Counting Kit 8 and tumor colony formation assay were design...OBJECTIVE To investigate the role and mechanism of G protein-coupled receptor kinase 2(GRK2)involving in hepatocel ular carcinoma(HCC)progression.METHODS Cel Counting Kit 8 and tumor colony formation assay were designed to detect HCC cell proliferation,wound healing assay was to detect HCC migration.The correlation between GRK2 and early growth response-1(EGR1)were detected by RT-PCR and real-time PCR assays.Co-immunoprecipitation and Western blot assay were adopted to detect the relationship between GRK2and insulin-like growth factor 1 receptor(IGF-1R)signaling pathway.RESULTS In this study we find that GRK2plays an inhibition role in IGF1-induced HCC cell proliferation and migration.Overexpression of GRK2 causes a decrease in EGR1 expression,while knockdown of GRK2 leads to the dramatically increase in EGR1 expression in the treatment of IGF1.Through co-immunoprecipitation and Western blot assay,we confirm that GRK2can interact with IGF-1R and inhibiting IGF1-induced activation of IGF1R signaling pathway.Silencing EGR1attenuates GRK2 overexpression-caused inhibition of cell proliferation,tumor colony number and migrationactivity,while overexpressing of EGR1 restores the antiproliferative and migratory effect by GRK2 overexpression in HCCLM3 cells.CONCLUSION Taken together,these results suggest that GRK2 may inhibit IGF1-induced HCC cell growth and migration through down-regulation of EGR1 and indicate that enforced GRK2 may offer a potential therapeutic approach against HCC.展开更多
文摘目的对比观察不同剂量四氯化碳(CCl_4)诱导小鼠肝纤维化模型的效果,探索一种稳定可行且较为高效的肝纤维化小鼠造模方法。方法将60只C57BL/6J小鼠随机分为正常组和模型组,模型组小鼠分别腹腔注射体积分数10%的CCl4(5 mL/kg)以及体积分数20%的CCl_4(1 mL/kg),每周2次,连续8周。分别在造模2周、4周、6周、8周注射后处死小鼠,进行HE染色和Masson染色,检测血清丙氨酸转氨酶(ALT)和天冬氨酸转氨酶(AST)水平,以及肝匀浆氧化/抗氧化指标,丙二醛(MDA)、谷胱甘肽过氧化物酶(GSH)和超氧化物岐化酶(SOD)变化,Western blotting法检测肝组织中胶原表达情况。结果随着造模时间的延长,病理染色显示肝纤维化程度不断加重,胶原表达逐步增加,血清ALT、AST水平逐渐升高,肝匀浆SOD、GSH活性降低,氧化产物MDA含量升高。在造模的相同时间点,体积分数10%CCl_4、5 m L/kg剂量组相比于体积分数20%CCl4、1 m L/kg剂量组,病理染色显示肝纤维化程度更加严重,血清ALT、AST水平明显升高,肝脏中SOD、GSH活性明显降低,氧化产物MDA含量明显升高,肝纤维化形成的时间更短,效果更好。结论两种造模方法都能形成肝纤维化小鼠模型,但体积分数10%CCl_4(5 m L/kg)剂量组的纤维化形成时间更短且效果更好。因此,每周2次,连续8周腹腔注射10%CCl_4(5 m L/kg)可作为一种较为理想的纤维化小鼠造模方法。
文摘由cAMP激活的交换蛋白分子(exchange protein activated by c AMP,Epac)是近年来新发现的鸟嘌呤核苷酸交换因子,参与一系列cAMP介导的信号通路。纤维化疾病是临床上常见的一类疾病,是在正常生理学(如衰老)或不同致病因素持续刺激下,使得细胞外基质过度沉积的结果。有研究表明,Epac在纤维化疾病中发挥重要作用,因此,该文对Epac在纤维化疾病中的作用进行综述,以促进对于Epac相关机制及药物的研究与开发。
基金The project supported by National Natural Science Foundation of China(81502123,81330081,81202596)Natural Science Foundation of Anhui Province(1308085QH130)+3 种基金Anhui Province Natural Science Foundation in University(KJ2014A119)Grants for Scientific Research of BSKY from Anhui Medical University(XJ201212)Specialized Research Fund for the Doctoral Program of Higher Education(20113420120006,20123420110003)Program for Tackling Key Problems in Science and Technology by Anhui Province(1301042098)
文摘OBJECTIVE To investigate the role and mechanism of G protein-coupled receptor kinase 2(GRK2)involving in hepatocel ular carcinoma(HCC)progression.METHODS Cel Counting Kit 8 and tumor colony formation assay were designed to detect HCC cell proliferation,wound healing assay was to detect HCC migration.The correlation between GRK2 and early growth response-1(EGR1)were detected by RT-PCR and real-time PCR assays.Co-immunoprecipitation and Western blot assay were adopted to detect the relationship between GRK2and insulin-like growth factor 1 receptor(IGF-1R)signaling pathway.RESULTS In this study we find that GRK2plays an inhibition role in IGF1-induced HCC cell proliferation and migration.Overexpression of GRK2 causes a decrease in EGR1 expression,while knockdown of GRK2 leads to the dramatically increase in EGR1 expression in the treatment of IGF1.Through co-immunoprecipitation and Western blot assay,we confirm that GRK2can interact with IGF-1R and inhibiting IGF1-induced activation of IGF1R signaling pathway.Silencing EGR1attenuates GRK2 overexpression-caused inhibition of cell proliferation,tumor colony number and migrationactivity,while overexpressing of EGR1 restores the antiproliferative and migratory effect by GRK2 overexpression in HCCLM3 cells.CONCLUSION Taken together,these results suggest that GRK2 may inhibit IGF1-induced HCC cell growth and migration through down-regulation of EGR1 and indicate that enforced GRK2 may offer a potential therapeutic approach against HCC.