抗药性,细菌/遗传学,药物耐受性,基因型,基因表达,聚合酶链反应,细菌,耐药基因/检测,药物钝化酶/表达,调控机制," /> 抗药性,细菌/遗传学,药物耐受性,基因型,基因表达,聚合酶链反应,细菌,耐药基因/检测,药物钝化酶/表达,调控机制,"/> Drug resistance,bacterial/genetics,Drug tolerance,Genotype,Gene expression,Polymerase chain reaction,Bacteria,Resistance
gene/detection,Inactive enzyme/expression;
Regulation mechanism
,"/> 细菌药物钝化酶基因分布及其表达诱导与抑制机制的研究
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浙江大学学报(医学版)  2013, Vol. 42 Issue (2): 131-140    DOI: 10.3785/j.issn.1008-9292.2013.02.002
专题报道     
细菌药物钝化酶基因分布及其表达诱导与抑制机制的研究
吴亦斐1,孙爱华2,赵金方3,葛玉梅1,严杰1
1.浙江大学医学院病原生物学系,浙江 杭州 310058;
2.浙江医学高等专科学校,浙江 杭州 310053;
3.浙江中医药大学附属第一医院检验科,浙江 杭州 310006;
Distribution of drug inactive enzyme genes in bacterial isolates and mechanism of its induction and inhibition
WU Yi-Fei1, SUN Ai-Hua2, ZHAO Jin-Fang3, GE Yu-Mei1, YAN Jie1
1.Department of Medical Microbiology and Parasitology,Zhejiang University School of Medicine,Hangzhou 310058,China; 2.Zhejiang Medical College,Hangzhou 310053,China; 3.Department of Laboratory Medicine,the First Affiliated Hospital of Zhejiang Chinese Medical University,Hangzhou 310006,China
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摘要:
目的:了解临床常见病原菌药物钝化酶基因及其优势基因携带模式,抗生素诱导药物钝化酶基因表达上调的作
用及其与细菌组氨酸激酶的关系。
方法:采用PCR和测序法,了解金黄色葡萄球菌、大肠埃希菌、肺炎克雷伯菌、鲍曼不动杆菌、阴沟肠杆菌临床菌株携带的β-内酰胺类、氨基糖苷类、大环内酯类钝化酶基因。采用实时荧光定量RT-PCR,了解抗生素诱导及组氨酸激酶阻断剂氯氰碘柳胺抑制药物钝化酶基因表达的作用。
结果:63株大肠埃希菌中检出4种β-内酰胺类、2种氨基糖苷类和1种大环内酯类钝化酶基因,优势基因携带模式为[TEM+CTX-M]+aac(3)-Ⅱ+mphA 16株(25.4%)和[TEM+CTX-M]+aac(6′)-Ⅰb 13株(20.6%)。24株金黄色葡
萄球菌中检出2种β-内酰胺类、3种氨基糖苷类钝化酶基因,优势基因携带模式为aph(3′)(41.7%)或aac(6)-Ⅰe-
aph(2)-Ⅰa(25.0%)。28株肺炎克雷伯菌中检出4种β-内酰胺酶、2种氨基糖苷类钝化酶基因,优势基因携带模式为
[TEM+SHV]+[aac(6′)-Ⅰb+aac(3)-Ⅱ](28.6%)和[TEM+SHV]+[aac(6′)-Ⅰb+aac(3)-Ⅱ]+mph(17.8%)。鲍曼不动杆菌和阴沟肠杆菌也以携带两类或三类药物钝化酶基因为优势模式。1/4 MIC青霉素、头胞噻肟和链霉素,能诱导3种β-内酰胺类和4种氨基糖苷类钝化酶基因表达显著上调(P<0.05),该诱导作用可被氯氰碘柳胺
所抑制(P<0.05)。
结论:上述临床常见病原菌多携带多类药物钝化酶基因并存在不同的优势基因携带模式。低浓度抗生素可能诱导药物钝化酶基因表达上调,但可被组氨酸激酶阻断剂所抑制。
关键词: 抗药性')" href="#">    
Abstract:
Objective: To determine the distribution and the predominant gene carrying model of drug inactive enzyme genes in bacterial isolates,and the mechanism of its induction and inhibition.
Methods: The β-lactam,aminoglycosides and macrolides inactive enzyme genes were detected by PCR and sequencing in S.aureus, E.coli,K.pncumoniae, A.baumanii and E.cloacae isolates.The expression of inactive enzyme genes were examined by real-time fluorescent quantitative RT-PCR when the bacterial isolates were treated with antibiotics or a histidine kinase blocker closantel.
Results: In 63 isolates of E.coli,4 kinds of β-lactam,2 aminoglycosides and 1 macrolides inactive enzyme-encoding genes were detected and the predominant gene-carrying models were [TEM+CTX-M]+aac(3)-Ⅱ+mphA(25.4%) and [TEM+CTX-M]+ aac(6′)-Ⅰb(20.6%).In 24 isolates of S.aureus,2 kinds of β-lactam and 3 aminoglycosides inactive enzyme-encoding genes were detected and the predominant gene-carrying models were aph(3′)(41.7%) or aac(6)-Ⅰe-aph(2)-Ⅰa(25.0%).In 28 isolates of K.pncumoniae,4 kinds of β-lactam and 2 aminoglycosides inactive enzyme-encoding genes were detected and the predominant gene-carrying models were [TEM+SHV]+[aac(6′)-Ⅰb+aac(3)-Ⅱ](28.6%) and [TEM+SHV]+[aac(6′)-Ⅰb+aac(3)-Ⅱ]+ mphA(17.8%).The
isolates of A.baumanii and E.cloacae also had a predominant model to carry 2 or 3 kinds of inactive enzyme-encoding genes.1/4 MIC of penicillin,cefotaxime or streptomycin induced the up-regulation of expression of 3 β-lactam or 4 aminoglycosides inactive enzyme-encoding genes(P<0.05),and this effect was inhibited by closantel(P<0.05).
Conclusions: The bacterial isolates frequently carry multiple kinds of inactive enzyme-encoding genes with different predominant gene-carrying models.Low concentration antibiotics can induce the up-regulation of inactive enzyme gene expression,which can be inhibited by histidine kinase blocker.
Key words: Drug resistance,bacterial/genetics')" href="#"> ')" href="#">Inactive enzyme/expression;
Regulation mechanism
收稿日期: 2012-12-28 出版日期: 2013-03-25
:  R 378  
基金资助:
国家自然科学基金资助项目(81271983);浙江省自然科学基金资助项目(LY12H19002).
通讯作者: 严杰(1956-),男,医学博士,教授,博导,主要从事病原菌致病与耐药机制及相关新型药物与疫苗研究。     E-mail: med_bp@zju.edu.cn
作者简介: 吴亦斐(1986-),硕士研究生,从事细菌耐药机制及其相关药物研究.
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吴亦斐, 孙爱华, 赵金方, 葛玉梅, 严杰. 细菌药物钝化酶基因分布及其表达诱导与抑制机制的研究[J]. 浙江大学学报(医学版), 2013, 42(2): 131-140.

WU Yi-Fei, SUN Ai-Hua, ZHAO Jin-Fang, GE Yu-Mei, YAN Jie. Distribution of drug inactive enzyme genes in bacterial isolates and mechanism of its induction and inhibition. Journal of ZheJiang University(Medical Science), 2013, 42(2): 131-140.

链接本文:

http://www.zjujournals.com/med/CN/10.3785/j.issn.1008-9292.2013.02.002        http://www.zjujournals.com/med/CN/Y2013/V42/I2/131

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