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中国真菌学杂志 2015, Vol. 10  Issue (6): 328-331.

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扁桃酸代谢对新生隐球菌毒力作用的探讨

周兆婧1,2, 方伟1, 潘炜华1, 廖万清1   

  1. 1. 上海市医学真菌分子生物学重点实验室第二军医大学附属长征医院皮肤科, 上海 200003;
    2. 河南省濮阳市油田总医院皮肤科, 濮阳 457001
  • 收稿日期:2015-07-08 出版日期:2015-12-28 发布日期:2015-12-28
  • 通讯作者: 廖万清,E-mail:liaowanqing@sohu.com;潘炜华,E-mail:panweihua@medmail.com.cn E-mail:liaowanqing@sohu.com;panweihua@medmail.com.cn
  • 作者简介:周兆婧,女(汉族),硕士,住院医师.E-mail:zhouzhaojing320@163.com
  • 基金资助:

    国家973项目(2013CB531601),国家自然科学基金(31270180),上海市医学真菌分子生物学实验室基金(14DZ2272900)

Effect of mandelic acid and its metabolism made on virulence of Cryptococcus neoformans

ZHOU Zhao-jing1,2, FANG Wei1, PAN Wei-hua1, LIAO Wan-qing1   

  1. Shanghai Key laboratory of Molecular Medical Mycology, Department of Dermatology, Changzheng Hospital, Second Military Medical University, Shanghai 200003
  • Received:2015-07-08 Online:2015-12-28 Published:2015-12-28

摘要:

目的探讨扁桃酸代谢对新生隐球菌毒力作用的影响。方法采用套叠PCR方法,构建扁桃酸消旋酶、扁桃酸脱氢酶及过氧化氢铜胺氧化酶基因重组片段,利用基因枪将重组片段转入新生隐球菌JEC21,应用PCR筛选、DNA测序等方法对阳性克隆子进行筛选与鉴定。体外观察并检测突变菌株对多种应激条件的应答反应。结果成功构建了新生隐球菌JEC21扁桃酸消旋酶、扁桃酸脱氢酶及过氧化氢铜胺氧化酶的基因缺陷菌株(mreΔ,lmdΔ,pcaoΔ),发现缺陷菌株mreΔ对于毒力功能影响不大,pcaoΔ、lmdΔ在高温、高渗、氧化应激等方面毒力减退,而黑色素分泌增加。结论扁桃酸代谢参与介导新生隐球菌毒力作用的调控,但其具体机制有待于进一步的研究探讨。

关键词: 新生隐球菌, 扁桃酸, 应激应答

Abstract:

Objective To explore the effect mandelic acid and its metabolism made on virulence of C.neoformans.Methods Constructed recombinant fragments of mandelate racemase,mandelate dehydrogenase and hydrogen peroxide copper amine oxidase by nested PCR,and put them into JEC21 through gene gun.Identified the positive clones by PCR,DNA sequencing.What's more,detected mutant strains in vitro responses to various stress conditions.Results Successfully constructed mutant strains (mreΔ,lmdΔ,pcaoΔ),and found mreΔ took little effect on virulent factors,pcaoΔ and lmdΔ showed weaker in high temperature,high permeability,oxidative stress but secreted more melanin.Conclusion Mandelic acid and its metabolism play role in mediating the virulence of C.neoformans,but the exact mechanism needs further study.

Key words: Cryptococcus neoformans, mandelic acide, stress response

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