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ID:33544100
大小:11.92 MB
页数:48页
时间:2019-02-27
《利用原子力显微镜研究壳聚糖膜对细胞弹性的影响》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、重庆大学硕士学位论文利用原子力显微镜研究壳聚糖膜对细胞弹性的影响姓名:田胜利申请学位级别:硕士专业:生物学指导教师:叶志义20120612重庆大学硕士学位论文中文摘要摘要细胞的弹性性质是细胞力学的一个重要参数,细胞的结构和功能与细胞的力学性质密切相关。外界物理环境的改变,如细胞外基质软硬度的变化会导致细胞弹性发生变化。原子力显微镜可以在生理条件下检测样品表面的力学性质,是研究细胞力学的一个十分有用的工具。本文以壳聚糖为材料制备了不同软硬的基底膜,利用原子力显微镜研究壳聚糖膜对细胞弹性的影响。通过配制不同浓度的壳聚糖溶液,采用流
2、延法制备了实验所需的壳聚糖膜,并对壳聚糖膜的细胞相容性、接触角、硬度做了测定。将正常的内皮细胞和肝癌细胞分别接种在不同浓度的壳聚糖膜上,对其形态特征(细胞铺展面积、细胞长、短轴比值等)和细胞弹性做了检测。本文的主要结果如下:①壳聚糖膜溶胀性最大的为3%壳聚糖膜,最小的为4%壳聚糖膜;膜的接触角约在65。~81。之间,膜的硬度(复水后)约在315KPa'---'413KPa之间,膜的接触角和硬度随着制膜溶液浓度的增大而增大;②内皮细胞和肝癌细胞在膜上铺展的面积随着制膜时溶液浓度的增大而增大,细胞长轴与短轴的比率在不同浓度的壳聚糖
3、膜上有所不同,说明细胞形态在不同的壳聚糖膜上会发生变化;内皮细胞最大的弹性模量约为2.44I4、animportantparameterofcellmechanics.cellstructureandfunctionarecloselyrelatedtothemechanicalpropertiesofcells.OutsidetheDhysicalenvironmentchanges,suchasthesubstratumhardnessthatthecellWasculturedchangewillleadtochangeoftheelasticityofcell.nleatomicforcemicroscopy(A5、FM)hasbeenanextremelyimportanttoolforcellmechanicsduetoitsabilitytomeasuresamplepropertiesinphysiologicalconditionswithminimaldestruction.Inthisthesisitfocusedonpreparationofdifferenthardnessofsubstratumfilms丽mchitosan,thestudyoftheinfluenceaboutthechitosanfilmsandt6、hecellbvAFM.Throughthechitosansolutionswithdifferentconcentrations,theuseofcastpreparationofchitosanfilmsofexperimentrequired,andtoevaluatethecellcompatibilityswellingindex,contactangel,hardnessofchitosanfilms.NormalendothelialcellandHepatocellularCarcinomaCellweres7、eededondifferentchitosanfilmstotestcellmorphologicalcharacteristics(1ikecellspreadingarea,celllengthandminoraxisration)andtheelasticityofcell.nefollowingaretheresultsofthepresentstudy:①Thefindingsshowthattheswellingindexofchitosanfilmsisthelargestis3%andtheleastis4%8、;thecontactangleofchitosanfilmsareabout65。"--81。,thehardnessofchitosanfilmsareabout315KPa--一413KPa,theyarebothincreasedwiththeincreaseofth
4、animportantparameterofcellmechanics.cellstructureandfunctionarecloselyrelatedtothemechanicalpropertiesofcells.OutsidetheDhysicalenvironmentchanges,suchasthesubstratumhardnessthatthecellWasculturedchangewillleadtochangeoftheelasticityofcell.nleatomicforcemicroscopy(A
5、FM)hasbeenanextremelyimportanttoolforcellmechanicsduetoitsabilitytomeasuresamplepropertiesinphysiologicalconditionswithminimaldestruction.Inthisthesisitfocusedonpreparationofdifferenthardnessofsubstratumfilms丽mchitosan,thestudyoftheinfluenceaboutthechitosanfilmsandt
6、hecellbvAFM.Throughthechitosansolutionswithdifferentconcentrations,theuseofcastpreparationofchitosanfilmsofexperimentrequired,andtoevaluatethecellcompatibilityswellingindex,contactangel,hardnessofchitosanfilms.NormalendothelialcellandHepatocellularCarcinomaCellweres
7、eededondifferentchitosanfilmstotestcellmorphologicalcharacteristics(1ikecellspreadingarea,celllengthandminoraxisration)andtheelasticityofcell.nefollowingaretheresultsofthepresentstudy:①Thefindingsshowthattheswellingindexofchitosanfilmsisthelargestis3%andtheleastis4%
8、;thecontactangleofchitosanfilmsareabout65。"--81。,thehardnessofchitosanfilmsareabout315KPa--一413KPa,theyarebothincreasedwiththeincreaseofth
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