丝素肽络合Ca2+含量影响细胞生长的研究 魏如男王富平张媚陈忠敏Summary:研究丝素肽(SFP)络合Ca2+含量对人正常肝细胞L02生长的影响。采用CaCl2-乙醇-水三元体系制备丝素蛋白(SF),并获得不同Ca2+含量的SFP后进行相对分子质量分级;采用EDTA滴定法测定SFP中Ca2+含量,细胞增殖率评价其细胞毒性,圆二色谱(CD)
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工程第三方检测合同工程防雷检测合同植筋拉拔检测方案传感器技术课后答案检测机构通用要求培训
二级结构。结果表明:随透析时间(12、24、36h)增加,SFP中Ca2+含量分别为16.00%、9.60%、0.40%,逐渐减小,对L02的生长作用由促进转变为抑制,其中在SFP相对分子质量大于8kD时尤为明显,L02细胞增殖率从(11868%±3.65%)减小到(59.78%±1.70%),对应SFP二级结构中3.43%的α螺旋和5.35%的无规则卷曲转变为β折叠。当SFP应用于组织工程支架领域时,络合较高Ca2+含量的SFP更有利于细胞的增殖。Key:丝素肽;钙离子含量;细胞生长作用;相对分子质量;二级结构:R318.08文献标志码:A:1001-7003(2019)03-0007-05引用页码:031102StudyontheeffectofsilkfibroinpeptidecomplexCa2+contentoncellgrowthWEIRu’nan,WANGFuping,ZHANGMei,CHENZhongmin(CollegeofPharmacyandBioengineering,ChongqingUniversityofTechnology,Chongqing400054,China)Abstract:Theeffectsofsilkfibroinpeptide(SFP)complexCa2+contentonthegrowthofhumannormalhepatocyteL02werestudied.TheCaCl2-ethanol-watersystemwasusedtopreparesilkfibroin(SF),andSFPwithdifferentCa2+contentwasobtained.Then,therelativemolecularmassofSFPwasclassified.ThecontentofCa2+inSFPwasmeasuredbyEDTAtitration.ThecytotoxicityofL02cellswasevaluatedbytheproliferationrate,andcirculardichroism(CD)wasusedtodetectthesecondarystructureofSFP.Theresultsshowthatasthetimeofdialysis(12,24,36h)increased,Ca2+contentofSFP(16.00%,9.60%,0.40%)graduallydecreased,andthegrowthofL02changedfrompromotiontoinhibition.EspeciallywhentherelativemolecularmassofSFPwasgreaterthan8kD,thecellproliferationrateofL02decreasedfrom(118.68%±3.65%)to(59.78%±1.70%).InthesecondarystructureofthecorrespondingSFP,3.43%ofalpha-helixand5.35%ofirregularcurltransformedtobeta-folding.Inthefieldoftissueengineeringscaffolds,SFPwithhighercontentofcomplexCa2+ismoreconducivetocellproliferation.Keywords:silkfibroinpeptide;Ca2+content;cellgrowth;relativemolecularmass;secondarystructure -全文完-