华西口腔医学杂志

• 基础研究 • 上一篇    下一篇

不同龋敏感人群变形链球菌分离株乳酸脱氢酶活性的初步研究

德琴1,刘天佳1,周学东1,何奎芳2,李 颂3,庄 4   

  1. 1.口腔生物医学工程教育部重点实验室,四川大学,四川 成都610041; 2.温州医学院 口腔内科教研室,浙江 温州325000;3.安徽医科大学口腔医院 牙体牙髓科,安徽 合肥230000; 4.第四军医大学口腔医院 牙体牙髓科,陕西 西安710032
  • 收稿日期:2005-04-25 修回日期:2005-04-25 出版日期:2005-04-20 发布日期:2005-04-20
  • 通讯作者: 刘天佳,Tel:028-85501439
  • 作者简介:德琴(1972-),女,广西人,副教授,博士,现在遵义医学院附属口腔医院工作
  • 基金资助:

    国家自然科学基金资助项目(30171013);贵州省自然科学基金资助项目[黔科合计(2004)3055]

Study on Lactate Dehydrogenase Activity ofStreptococcus mutansIsolates Derived from Caries-active and Caries-free In- dividuals

YANG De-qin1, LIUTian-jia1, ZHOUXue-dong1, HEKui-fang2, LISong3, ZHUANGHeng4   

  1. 1.KeyLab. ofO- ral Biomedical Engineering ofMinistry ofEducation, Sichuan University, Chengdu610041, China;2.Dept. ofOral Medicine, WenzhouMedical College,Wenzhou325000,China;3.Dept. ofOperative Dentistry andEndodontics, StomatologyCollege ofAnhui University ofMedicalSciences, Hefei230000, China;4.Dept. ofOperative Dentistry andEndodontics, The FourthMilitaryMedi- cal University, Xi′an710032,China
  • Received:2005-04-25 Revised:2005-04-25 Online:2005-04-20 Published:2005-04-20

摘要: 目的 初步探讨不同龋敏感人群变形链球菌乳酸脱氢酶(LDH)活性与龋病发生的关系,筛选不同LDH活 力菌株。方法 从高龋和无龋个体分离变形链球菌各50株,应用经典考马斯亮蓝蛋白定量方法对菌细胞裂解液 蛋白进行定量,通过还原性辅酶Ⅰ氧化法测定LDH活性,比较两组菌株LDH活性差异以及不同LDH活性的菌株在 两组人群的分布。结果 两组菌株LDH的酶活性均值总体无差异(P>0·05);不同LDH活性的菌株在两组人群的 分布不同(P<0·05)。结论 变形链球菌LDH活性与龋病的发生有一定相关性。

关键词: 变形链球菌, 乳酸脱氢酶, 蛋白定量, 酶活性

Abstract:

Objective To preliminarily investigate the relationship between the Lactate dehydrogenase (LDH) activity ofStrep- tococcus mutans(S.mutans)and dental caries initiation.Methods 100S. mutansstrains derived from caries-active and caries- free individuals were cultured in BHI medium supplemented with glucose. Cells were extracted and ruptured, and the extracted liquid proteinwas quantifiedwith Coomassie brilliant blue G250 stainingmethods. LDHactivitywas assayed usingthe pyruvate-de- pendent oxidation of NADH-with and without FDP.Results LDH activity of the two groups strains had no difference (P> 0·05), but the distribution of differ class enzyme activity strains in the two groups was different (P<0·05).Conclusion LDH activity ofS.mutansis correlated to the initiation of dental caries to some extent. The measurement methods in this study can be applied in preliminary quantitation of LDH activity and the screening ofS.mutansstrains.

Key words: Streptococcus mutans, lactate dehydrogenase, protein quantitation, enzyme activity