Laser in situ keratomileusis(LASIK)is a relatively new ophthalmic procedure in refractive surgery.It involves the use of a microkeratome to create a thin corneal flap followed by excimer laser ablation of the corneal ...Laser in situ keratomileusis(LASIK)is a relatively new ophthalmic procedure in refractive surgery.It involves the use of a microkeratome to create a thin corneal flap followed by excimer laser ablation of the corneal stroma and repositioning of the flap.However,complications are bound to occur when a surgical procedure is performed with increasing frequency.In some cases,serious complications such as keratectasia occurred.Risk factors for corneal keratectasia include a thin cornea at baseline,thick corneal flap,excessive ablation,irregular corneal thickness,diverse ablation rates,preexisting keratoconus or form fruste keratoconus,and high intraocular pressure(IOP)~[1].It is evident from incisional refractive surgery that the cornea is not mechanically inert.The mechanical environment of the central corneal tissue is also altered un-展开更多
旨在对基质金属蛋白酶组织抑制剂(tissue inhibitor of matrix metalloproteinases,TIMPs)家族成员中的TIMP1进行克隆和分析,通过过表达与敲减TIMP1,探究TIMP1对毛囊毛乳头细胞(dermal papilla cells,DPCs)毛囊生长相关基因的调控作用...旨在对基质金属蛋白酶组织抑制剂(tissue inhibitor of matrix metalloproteinases,TIMPs)家族成员中的TIMP1进行克隆和分析,通过过表达与敲减TIMP1,探究TIMP1对毛囊毛乳头细胞(dermal papilla cells,DPCs)毛囊生长相关基因的调控作用。本研究通过分子克隆TIMP1编码区(coding sequence,CDS)序列,并对其进行生物信息学功能分析。之后,构建过表达载体pcDNA 3.1-TIMP1并设计合成siRNA,在DPCs中过表达和敲低TIMP1,检测毛囊生长发育相关基因的表达,并通过EdU和CCK-8检测DPCs的增殖水平。结果显示,兔TIMP1基因的CDS区全长624 bp,共编码207个氨基酸。生物信息学分析表明TIMP1蛋白存在信号肽,不包含跨膜结构域,在不同哺乳动物中存在同源性。在DPCs中过表达TIMP1能够极显著上调BMP2(bone morphogenetic protein 2)、SFRP2(secreted frizzled-related protein 2)、TGFβ1(tranforming growth factorβ1)基因的mRNA表达水平(P<0.01),极显著下调WNT2(wnt family member 2)基因的mRNA表达水平(P<0.01),敲减TIMP1能显著下调BMP2、SFRP2基因的mRNA的表达(P<0.05),极显著下调TGFβ1基因的mRNA表达(P<0.01)。此外,EdU和CCK-8结果显示过表达TIMP1能够抑制DPCs的增殖,敲低TIMP1能够促进DPCs的增殖。本研究成功克隆家兔TIMP1基因CDS序列,并对其生物信息学功能进行预测,初步分析TIMP1对毛囊生长相关基因的调控作用,验证了其抑制DPCs增殖的作用,为阐明家兔毛囊生长发育的理论研究提供参考。展开更多
基金supported by the National Natural Science Foundation of China(11032008)Natural Science Foundation of Shanxi Province(2012011046-2)
文摘Laser in situ keratomileusis(LASIK)is a relatively new ophthalmic procedure in refractive surgery.It involves the use of a microkeratome to create a thin corneal flap followed by excimer laser ablation of the corneal stroma and repositioning of the flap.However,complications are bound to occur when a surgical procedure is performed with increasing frequency.In some cases,serious complications such as keratectasia occurred.Risk factors for corneal keratectasia include a thin cornea at baseline,thick corneal flap,excessive ablation,irregular corneal thickness,diverse ablation rates,preexisting keratoconus or form fruste keratoconus,and high intraocular pressure(IOP)~[1].It is evident from incisional refractive surgery that the cornea is not mechanically inert.The mechanical environment of the central corneal tissue is also altered un-
文摘旨在对基质金属蛋白酶组织抑制剂(tissue inhibitor of matrix metalloproteinases,TIMPs)家族成员中的TIMP1进行克隆和分析,通过过表达与敲减TIMP1,探究TIMP1对毛囊毛乳头细胞(dermal papilla cells,DPCs)毛囊生长相关基因的调控作用。本研究通过分子克隆TIMP1编码区(coding sequence,CDS)序列,并对其进行生物信息学功能分析。之后,构建过表达载体pcDNA 3.1-TIMP1并设计合成siRNA,在DPCs中过表达和敲低TIMP1,检测毛囊生长发育相关基因的表达,并通过EdU和CCK-8检测DPCs的增殖水平。结果显示,兔TIMP1基因的CDS区全长624 bp,共编码207个氨基酸。生物信息学分析表明TIMP1蛋白存在信号肽,不包含跨膜结构域,在不同哺乳动物中存在同源性。在DPCs中过表达TIMP1能够极显著上调BMP2(bone morphogenetic protein 2)、SFRP2(secreted frizzled-related protein 2)、TGFβ1(tranforming growth factorβ1)基因的mRNA表达水平(P<0.01),极显著下调WNT2(wnt family member 2)基因的mRNA表达水平(P<0.01),敲减TIMP1能显著下调BMP2、SFRP2基因的mRNA的表达(P<0.05),极显著下调TGFβ1基因的mRNA表达(P<0.01)。此外,EdU和CCK-8结果显示过表达TIMP1能够抑制DPCs的增殖,敲低TIMP1能够促进DPCs的增殖。本研究成功克隆家兔TIMP1基因CDS序列,并对其生物信息学功能进行预测,初步分析TIMP1对毛囊生长相关基因的调控作用,验证了其抑制DPCs增殖的作用,为阐明家兔毛囊生长发育的理论研究提供参考。
