华西口腔医学杂志

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变异链球菌gtfs在不同pH条件下表达的差异性

陆玉1,2, 刘天佳3, 杨锦波3   

  1. 1.口腔疾病研究国家重点实验室, 四川大学, 四川成都610041;2.首都医科大学口腔医院牙体牙髓科, 北京100050; 3.四川大学华西口腔医院牙体牙髓科, 四川成都610041
  • 收稿日期:2008-12-25 修回日期:2008-12-25 出版日期:2008-12-20 发布日期:2008-12-20
  • 通讯作者: 刘天佳,Tel:028-85502208
  • 作者简介: 陆玉(1977-),女,陕西人,主治医师,博士
  • 基金资助:

    高等学校博士学科点专项科研基金资助项目(20050610075)

Differential analyses of mRNA expression of gtfs from Streptococcus mutans in different pH condition

LU Yu1,2, LIU Tian -jia3,YANG Jin -bo3   

  1. 1. State Key Laboratory of Oral Diseases, Sichuan University, Chengdu 610041, China; 2. Dept. of Dentistry and Endodontics, Beijing Stomatological Hospital, Capital Medical University, Beijing 100050, China;3. Dept. of Dentistry and Endodontics, West China College of Stomatology, Sichuan University, Chengdu 610041, China
  • Received:2008-12-25 Revised:2008-12-25 Online:2008-12-20 Published:2008-12-20
  • Contact: LIU Tian -jia,Tel:028-85502208

摘要:

目的检测具有不同产胞外多糖(EPS)能力的变异链球菌菌株在不同pH条件下产EPS的能力及其与gtfA、gtfB、gtfC、gtfD表达变化的关系。方法选取变异链球菌(血清型c)临床分离株502(高产糖株)和参考株UA159(低产糖株),以实时定量逆转录聚合酶链反应(real-time RT-PCR)方法检测在不同pH条件下与变异链球菌产糖能力密切相关的毒力因子gtfA、gtfB、gtfC、gtfD的表达变化。结果在pH5.5条件下,高产糖株和低产糖株gtfA、gtfB、gtfD的表达均有不同程度的升高,而gtfC略降低,高产糖株gtfB、gtfC的表达水平高于低产糖株。结论gtfs的表达水平与变异链球菌的致龋力密切相关。

关键词: 变异链球菌, 葡萄糖基转移酶, 实时定量逆转录聚合酶链反应

Abstract:

Objective To determine the expression level of each gtf under different pH cultural conditions and to find the relationship between gtf expression levels with environmental pH in different strains of Streptococcus mutans (S.mutans). Methods S.mutans form clinical isolation with different extracellular polysaccharides(EPS) producibility and UA159 were selected. Their ability to produce EPS under pH5.5 and pH7 were tested. Then in two strains, the relative quantity of gtfA, gtfB, gtfC, gtfD′ s mRNA which were related to S.mutan′ s ability to produce EPC, were examined by real-time reverse transcription-polymerase chain reaction(real-time RT-PCR) methods under different pH culture condition. Results At pH5.5, expression levels of gtfA, gtfB, gtfD were increased while that of gtfC were decreased in both strains, and that of gtfB, gtfC were higher in strain which produces more ECP. Conclusion The expression levels of gtfs related closely to the cariogenicity of S.mutan.

Key words: Streptococcus mutans, glucosyl transferases, real-time reverse transcription-polymerase chain reaction