Long-term treatment with an agonist of peroxisome proliferator-activated receptor （PPAR）-γ is associated with bone fractures in the clinical practice. However, the mechanisms underlying the frac- tures are not full...Long-term treatment with an agonist of peroxisome proliferator-activated receptor （PPAR）-γ is associated with bone fractures in the clinical practice. However, the mechanisms underlying the frac- tures are not fully understood. This study was aimed to examine the effect of rosiglitazone （an agonist of PPAR-T） of different doses on the proliferation, differentiation, and transforming growth factor beta 1 （TGF-131）-induced expression of connective tissue growth factor （CTGF） in primary rat osteoblasts in vitro. Osteoblasts were isolated from newly born SD rats and treated with different doses of rosiglita- zone （0-20 gmol/L）. The proliferation and differentiation of osteoblasts were measured by MTT assay and NPP assay, respectively. The expression of CTGF was determined by RT-PCR and Western blotting. The results showed that most isolated osteoblasts displayed strong alkaline phosphatase （ALP） activity and treatment with different doses of rosiglitazone did not affect their proliferation, but significantly in- hibited the differentiation of osteoblasts in a dose-dependent manner. Moreover, treatment with different doses of rosiglitazone significantly reduced the TGF-131-induced CTGF mRNA transcription and protein expression in a dose-dependent manner in rat osteoblasts. It was concluded that the activation of PPAR-y may inhibit the differentiation of osteoblasts by reducing the TGF-131-induced CTGF expres- sion in vitro.展开更多
目的:观察桃红芪术软肝煎从(transforming growth factor beta,TGF-β)/Smad信号通路逆转上皮-间充质细胞转化(e p i t h e l i a lmesenchymal transition,EMT)抗肝纤维化的作用.方法:取对数生长期的HepG2细胞进行试验,将细胞分为7组:...目的:观察桃红芪术软肝煎从(transforming growth factor beta,TGF-β)/Smad信号通路逆转上皮-间充质细胞转化(e p i t h e l i a lmesenchymal transition,EMT)抗肝纤维化的作用.方法:取对数生长期的HepG2细胞进行试验,将细胞分为7组:空白组、TGF-β诱导EMT组、TGF-β+中药[低剂量组(p e a c h stilbene low dose group,THQL)、中剂量组(peach stilbene middle dose group,THQM)、高剂量组(peach stilbene high dose group,THQH)]、TGF-β+扶正祛瘀胶囊组(Fuzheng Huayu recipe,FZHY组)、TGF-β+秋水仙碱组(c o l c h i c i n e g r o u p,QSXJ组),采用免疫荧光和Western blot方法检测E-cadherin、Vimentin、Smad2、TGF-βR1表达情况,并检测细胞上清液中的谷丙转氨酶(alanine aminotransferase,ALT)、谷草转氨酶(aspartate transaminase,AST)、甲胎蛋白(alpha fetoprotein,AFP)表达情况.结果:诱导组AFP诱导第3天浓度明显降低,差异具有统计学意义(P<0.05);用药干预后,用药组ALT、AST水平均低于模型组,差异具有统计学意义(P<0.05),THQL及TRQM的ALT水平均低于FZHY和QSXJ,差异具有统计学意义(P<0.05),THQM及THQH的AST水平均低于FZHY和QSXJ,差异具有统计学意义(P<0.05);桃红芪术软肝煎可以改善HepG2细胞被诱导发生EMT的形态,其中THQM组和THQH组形态改变较为明显;桃红芪术软肝煎可以上调E-cadherin表达,下调Smad2、TGF-βR1、Vimentin表达.结论:桃红芪术软肝煎可以通过作用于TGF-β/Smad信号通路逆转上皮-间质转化,从而起到抗肝纤维化的作用.展开更多
基金supported by the Natural Science Foundation of Hubei Province,China(No.2010CDB09806)
文摘Long-term treatment with an agonist of peroxisome proliferator-activated receptor （PPAR）-γ is associated with bone fractures in the clinical practice. However, the mechanisms underlying the frac- tures are not fully understood. This study was aimed to examine the effect of rosiglitazone （an agonist of PPAR-T） of different doses on the proliferation, differentiation, and transforming growth factor beta 1 （TGF-131）-induced expression of connective tissue growth factor （CTGF） in primary rat osteoblasts in vitro. Osteoblasts were isolated from newly born SD rats and treated with different doses of rosiglita- zone （0-20 gmol/L）. The proliferation and differentiation of osteoblasts were measured by MTT assay and NPP assay, respectively. The expression of CTGF was determined by RT-PCR and Western blotting. The results showed that most isolated osteoblasts displayed strong alkaline phosphatase （ALP） activity and treatment with different doses of rosiglitazone did not affect their proliferation, but significantly in- hibited the differentiation of osteoblasts in a dose-dependent manner. Moreover, treatment with different doses of rosiglitazone significantly reduced the TGF-131-induced CTGF mRNA transcription and protein expression in a dose-dependent manner in rat osteoblasts. It was concluded that the activation of PPAR-y may inhibit the differentiation of osteoblasts by reducing the TGF-131-induced CTGF expres- sion in vitro.
文摘目的:观察桃红芪术软肝煎从(transforming growth factor beta,TGF-β)/Smad信号通路逆转上皮-间充质细胞转化(e p i t h e l i a lmesenchymal transition,EMT)抗肝纤维化的作用.方法:取对数生长期的HepG2细胞进行试验,将细胞分为7组:空白组、TGF-β诱导EMT组、TGF-β+中药[低剂量组(p e a c h stilbene low dose group,THQL)、中剂量组(peach stilbene middle dose group,THQM)、高剂量组(peach stilbene high dose group,THQH)]、TGF-β+扶正祛瘀胶囊组(Fuzheng Huayu recipe,FZHY组)、TGF-β+秋水仙碱组(c o l c h i c i n e g r o u p,QSXJ组),采用免疫荧光和Western blot方法检测E-cadherin、Vimentin、Smad2、TGF-βR1表达情况,并检测细胞上清液中的谷丙转氨酶(alanine aminotransferase,ALT)、谷草转氨酶(aspartate transaminase,AST)、甲胎蛋白(alpha fetoprotein,AFP)表达情况.结果:诱导组AFP诱导第3天浓度明显降低,差异具有统计学意义(P<0.05);用药干预后,用药组ALT、AST水平均低于模型组,差异具有统计学意义(P<0.05),THQL及TRQM的ALT水平均低于FZHY和QSXJ,差异具有统计学意义(P<0.05),THQM及THQH的AST水平均低于FZHY和QSXJ,差异具有统计学意义(P<0.05);桃红芪术软肝煎可以改善HepG2细胞被诱导发生EMT的形态,其中THQM组和THQH组形态改变较为明显;桃红芪术软肝煎可以上调E-cadherin表达,下调Smad2、TGF-βR1、Vimentin表达.结论:桃红芪术软肝煎可以通过作用于TGF-β/Smad信号通路逆转上皮-间质转化,从而起到抗肝纤维化的作用.
