谷月¹,
孙昊宇²,
葛鸿铭²,
马清萍³,
林志芬²,
张饮江^1,3
1. 上海海洋大学水产与生命学院, 上海 201306;
2. 污染控制与资源化研究国家重点实验室, 同济大学环境科学与工程学院, 上海 200092;
3. 水域环境生态上海高校工程研究中心, 上海 201306

作者简介: 谷月(1991-),女,硕士研究生,研究方向为水域环境生态学,E-mail:18717836191@163.com.

基金项目: 国家自然科学面上基金(21377096, 21577105)；同济大学英才(攀登)计划(0400219287)；上海市科学技术委员会(14DZ2261100)资助；污染控制与资源化研究国家重点实验室自主课题(PCRRK16007)


中图分类号: X171.5

Joint Effects and Mechanism of Binary Toxicity of Quorum Sensing Inhibitors with Sulfamethoxazole and Doxycycline Hyclate to Escherichia coli

Gu Yue¹,
Sun Haoyu²,
Ge Hongming²,
Ma Qingping³,
Lin Zhifen²,
Zhang Yinjiang^1,3
1. College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China;
2. State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;
3. Engineering Research Center for Water Environment Ecology in Shanghai, Shanghai 201306, China

CLC number: X171.5

-->

摘要
HTML全文
图(0)表(0)
参考文献(0)
相关文章
施引文献
资源附件(0)
访问统计

摘要:群体感应抑制剂(QSIs)具有不会产生抗药性的特点，从而被作为抗生素的可能替代品，具有广阔的应用前景，因此其存在着与传统抗生素环境联合暴露的可能，但是目前尚缺乏相关联合效应的研究。本文以大肠杆菌(Escherichia coli)为受试生物，测定了7种QSIs(DL-焦谷氨酸、N-乙烯基吡咯烷酮、呋喃酮乙酸酯、2-甲基四氢呋喃-3-酮、3,4-二溴-2(5H)-呋喃酮、(R)-3-吡咯烷醇、D-脯氨醇)分别与磺胺甲恶唑(SMX)和盐酸强力霉素(DH)的二元联合毒性，并初步探讨了它们的联合作用机制。根据结果分析，前5种QSIs作用于AI-2类信号分子介导的群体感应系统，与AI-2类信号分子竞争结合LsrB蛋白，此通路与SMX、DH的作用通路互不影响，因此联合效应为相加；后2种QSIs作用于AI-1类信号分子介导的群体感应系统，与AI-1类信号分子竞争结合SdiA蛋白，而SMX、DH的作用可能刺激SdiA蛋白的表达，从而需要消耗更多的QSIs与SdiA结合，因而联合效应为拮抗。本实验研究可为传统抗生素与QSIs联合暴露的生态风险评价提供一定理论基础。
关键词: 群体感应抑制剂/
磺胺甲恶唑/
盐酸强力霉素/
大肠杆菌/
联合毒性

Abstract:Quorum sensing inhibitors (QSIs) are recognized as a promising alternative to the antibiotics, due to their outstanding characteristics of not inducing drug resistance. Therefore, there stands a high possibility that the environmental organisms are exposed simultaneously to QSIs and antibiotics. However, litter research has been conducted on their potential joint effects on the organisms so far. In this study, seven potential QSIs, i.e., DL-pyroglutamic acid, N-vinyl-2-pyrrolidone, furaneol acetate, 2-methyltetrahy-drofuran-3-one, 3,4-dibromo-5H-furan-2-one, (R)-3-hydroxypyrrolidine, D(-)prolinol), and two types of antibiotics, i.e., sulfamethoxazole (SMX) and tetracycline (DH), were investigated for their binary mixture toxicity on Escherichia coli, and the possible mechanism was explored as well. The results revealed that the first five QSIs act on the AI-2-mediated QS system through binding competitively to LsrB proteins, which exerted no influence on the pathways of SMX and DH and thus presented simply additive joint effects with the antibiotics. Whereas, the latter two QSIs primarily targeted the AI-1-mediated QS system by binding to SdiA proteins. Since SMX and DH may stimulate the production of SdiA protein, which consumed more QSI molecules, the joint effects of the second kind of QSIs with SMX and DH were antagonism. This study provides some basic data for ecological risk assessment on the joint effect of the QSIs and traditional antibiotics.
Key words:quorum sensing inhibitiors/
sulfamethoxazole/
doxycycline hyclate/
Escherichia coli/
joint effect.