摘要
目的:探讨TGF-β1对Amelotin基因表达的影响及作用机制。方法:通过实时定量RT-PCR法观察TGF-β1对釉成熟蛋白(Amelotin)基因表达的影响;利用TGFBR1小RNA干扰(siRNA)技术阻断TGF-β受体I(TGFBR1)表达,或在成釉细胞中过表达活化型TGF-β受体I(T204D),观察Amelotin基因表达的改变;利用双荧光素酶基因报告系统观察TGF-β1和T204D对成釉细胞Amelotin启动子转录活性的调控作用。结果:TGF-β1刺激成釉细胞后,Amelotin基因表达显著增强;利用小RNA干扰技术使TGFBR1基因沉默,实时定量RT-PCR显示TGF-β1调控Amelotin基因表达的作用减弱,而pCDNA3.1-T204D转染成釉细胞促进了Amelotin基因表达。将pGL3-Amelotin启动子转染成釉细胞,并用TGF-β1刺激成釉细胞,Amelotin启动子的转录活性明显增强。TGFBR1小RNA干扰阻断了TGF-β1诱导的Amelotin启动子转录活性,而将pGL3-Amelotin与T204D共转染成釉细胞后,促进了Amelotin启动子的转录活性。结论:在牙釉质发育过程中,TGF-β1和活化型TGFBR1信号通路调控成釉细胞Amelotin基因表达。
Objective: To study the function and molecular mechanisms of TGF-β1 on Amelotin gene expression.Methods: We observe the regulation of TGF-β1 on Amelotin gene in ameloblasts by real time RT-PCR,transfected TGFBR1 siRNA in ameloblasts to observe the TGF-β1-induced Amelotin expression,overexpressed activated TGFBR1(T204D) in ameloblasts to observe Amelotin expression,and observed Amelotin promoter activity induced by TGF-β1,TGFBR1 siRNA,or T204D in ameloblasts by dual luciferase analysis.Results: TGF-β1 increased Amelotin gene expression in ameloblasts;knockdown of TGFBR1 gene expression by siRNA inhibited the TGF-β1-induced Amelotin expression,and the overexpression of T204D in ameloblasts enhanced the expression of Amelotin gene.Amelotin promoter study showed:TGF-β1 stimulation,or T204D transfection.enhanced Amelotin promoter activity in ameloblasts,and knockdown of TGFBR1 expression by siRNA blocked the TGF-β1-induced Amelotin promoter activity.Conclusion: In amelogenesis,TGF-β1 regulate Amelotin gene expression via the activated TGFBR1 signaling pathway.
出处
《口腔医学研究》
CAS
CSCD
北大核心
2011年第6期453-455,459,共4页
Journal of Oral Science Research
基金
国家自然科学基金(编号:30973327)
山东省自然科学基金(编号:ZR2010HM076)