OBJECTIVE Basic fibroblast growth factor(b FGF)and platelet-derived growth factor(PDGF)produced by hepatocellular carcinoma(HCC)cells are responsible for the cell growth.Accumulating evidence shows that insulin-like g...OBJECTIVE Basic fibroblast growth factor(b FGF)and platelet-derived growth factor(PDGF)produced by hepatocellular carcinoma(HCC)cells are responsible for the cell growth.Accumulating evidence shows that insulin-like growth factor-binding protein-3(IGFBP-3)suppresses HCC cell proliferation in both IGF-dependent and independent manners.The present study is to investigate whether treatment with exogenous IGFBP-3 inhibits bF GF and PDGF production and the cell proliferation of HCC cells.METHODS Cell Counting Kit 8 assay were designed to detect HCC cell proliferation,transcription factor early growth response-1(EGR1)involving in IGFBP-3 regulation of b FGF and PDGF were detected by RT-PCR and Western blot assays.Western blot assay was adopted to detect the IGFBP-3 regulating insulin-like growth factor 1 receptor(IGF-1R)signaling pathway.RESULTS The present study demonstrates that IGFBP-3 suppressed IGF-1-induced b FGF and PDGF expression while it does not affect their expression in the absence of IGF-1.To delineate the underlying mechanism,Western-blot and RT-PCR assays confirmed that the transcription factor early growth response protein 1(EGR1)is involved in IGFBP-3 regulation of b FGF and PDGF.IGFBP-3 inhibition of type 1 insulin-like growth factor receptor(IGF1R),ERK and AKT activation is IGF-1-dependent.Furthermore,transient transfection with constitutively activated AKT or MEK partially blocks the IGFBP-3 inhibition of EGR1,b FGF and PDGF expression.CONCLUSION In conclusion,these findings suggest that IGFBP-3suppresses transcription of EGR1 and its target genes b FGF and PDGF through inhibiting IGF-1-dependent ERK and AKT activation.It demonstrates the importance of IGFBP-3 in the regulation of HCC cell proliferation,suggesting that IGFBP-3 could be a target for the treatment of HCC.展开更多
目的观察血小板衍生生长因子-BB(PDGF-BB)与胰岛素样生长因子-Ⅰ(IGF-Ⅰ)联合应用对大鼠正畸牙压力侧牙周膜细胞(PDLCs)中整合素β3蛋白表达的影响。方法建立SD大鼠正畸牙移动模型,隔日于正畸牙颊侧牙龈黏膜下单独或联合注射10 ng PDGF...目的观察血小板衍生生长因子-BB(PDGF-BB)与胰岛素样生长因子-Ⅰ(IGF-Ⅰ)联合应用对大鼠正畸牙压力侧牙周膜细胞(PDLCs)中整合素β3蛋白表达的影响。方法建立SD大鼠正畸牙移动模型,隔日于正畸牙颊侧牙龈黏膜下单独或联合注射10 ng PDGF-BB及200 ng IGF-Ⅰ,加力10 d后处死大鼠,取材用免疫组织化学方法检测正畸牙压力侧牙周膜细胞中整合素β3的表达。结果 PDGF-BB、IGF-Ⅰ单独或联合应用均能增强压力侧牙周膜细胞中整合素β3表达(P<0.01);与PDGF-BB、IGF-Ⅰ单独应用比较,IGF-Ⅰ加PDGF-BB组牙周膜细胞中整合素β3表达明显增强(P<0.05和P<0.01)。结论外源性PDGF-BB和IGF-Ⅰ在大鼠正畸牙的局部注射能上调压力侧牙周膜细胞中整合素β3表达,二者联合应用具有协同效应。展开更多
基金supported by National Natural Science Foundation of China(81502123 and81330081)Natural Science Foundation of Anhui Province(1308085QH130)Anhui Province Nature Science Foundation in University(KJ2014A119)
文摘OBJECTIVE Basic fibroblast growth factor(b FGF)and platelet-derived growth factor(PDGF)produced by hepatocellular carcinoma(HCC)cells are responsible for the cell growth.Accumulating evidence shows that insulin-like growth factor-binding protein-3(IGFBP-3)suppresses HCC cell proliferation in both IGF-dependent and independent manners.The present study is to investigate whether treatment with exogenous IGFBP-3 inhibits bF GF and PDGF production and the cell proliferation of HCC cells.METHODS Cell Counting Kit 8 assay were designed to detect HCC cell proliferation,transcription factor early growth response-1(EGR1)involving in IGFBP-3 regulation of b FGF and PDGF were detected by RT-PCR and Western blot assays.Western blot assay was adopted to detect the IGFBP-3 regulating insulin-like growth factor 1 receptor(IGF-1R)signaling pathway.RESULTS The present study demonstrates that IGFBP-3 suppressed IGF-1-induced b FGF and PDGF expression while it does not affect their expression in the absence of IGF-1.To delineate the underlying mechanism,Western-blot and RT-PCR assays confirmed that the transcription factor early growth response protein 1(EGR1)is involved in IGFBP-3 regulation of b FGF and PDGF.IGFBP-3 inhibition of type 1 insulin-like growth factor receptor(IGF1R),ERK and AKT activation is IGF-1-dependent.Furthermore,transient transfection with constitutively activated AKT or MEK partially blocks the IGFBP-3 inhibition of EGR1,b FGF and PDGF expression.CONCLUSION In conclusion,these findings suggest that IGFBP-3suppresses transcription of EGR1 and its target genes b FGF and PDGF through inhibiting IGF-1-dependent ERK and AKT activation.It demonstrates the importance of IGFBP-3 in the regulation of HCC cell proliferation,suggesting that IGFBP-3 could be a target for the treatment of HCC.
文摘目的观察血小板衍生生长因子-BB(PDGF-BB)与胰岛素样生长因子-Ⅰ(IGF-Ⅰ)联合应用对大鼠正畸牙压力侧牙周膜细胞(PDLCs)中整合素β3蛋白表达的影响。方法建立SD大鼠正畸牙移动模型,隔日于正畸牙颊侧牙龈黏膜下单独或联合注射10 ng PDGF-BB及200 ng IGF-Ⅰ,加力10 d后处死大鼠,取材用免疫组织化学方法检测正畸牙压力侧牙周膜细胞中整合素β3的表达。结果 PDGF-BB、IGF-Ⅰ单独或联合应用均能增强压力侧牙周膜细胞中整合素β3表达(P<0.01);与PDGF-BB、IGF-Ⅰ单独应用比较,IGF-Ⅰ加PDGF-BB组牙周膜细胞中整合素β3表达明显增强(P<0.05和P<0.01)。结论外源性PDGF-BB和IGF-Ⅰ在大鼠正畸牙的局部注射能上调压力侧牙周膜细胞中整合素β3表达,二者联合应用具有协同效应。
