東寶瑜 許馨月 李樹華 李帥 曾雪婷 王雨萌 孫琨 汪川 曾菊梅



摘 要 ???:為了研究黃芩提取物對膿腫分枝桿菌浮游細菌及生物膜的影響,本研究以膿腫分枝桿菌標準菌株ATCC 19977以及臨床分離株作為受試菌,采用Alarmar-Blue液體藥敏法測定黃芩提取物對膿腫分枝桿菌的最小抑菌濃度(MIC),平板涂布法測定最小殺菌濃度(MBC),結晶紫染色法和掃描電子顯微鏡分析黃芩提取物對膿腫分枝桿菌生物膜形成量及形態結構的影響,進一步采用了RT-qPCR探究黃芩提取物對分枝菌酸合成相關基因表達的影響.結果表明黃芩提取物對膿腫分枝桿菌標準菌株ATCC 19977以及8株臨床分離株的MIC ?90為50~100 mg/mL,MBC為50~200 mg/mL;黃芩提取物可顯著降低膿腫分枝桿菌生物膜形成量( P <0.05),破壞生物膜的結構,并且顯著降低分枝菌酸合成相關基因表達量( P <0.01).本研究表明黃芩提取物能夠抑制膿腫分枝桿菌的生長以及生物膜的形成.
關鍵詞 : 黃芩提取物; 膿腫分枝桿菌; 浮游生長; 生物膜抑制
中圖分類號 : Q93 文獻標識碼 : DOI : ?10.19907/j.0490-6756.2023.046003
收稿日期: ?2022-09-21
基金項目: ??四川省國合項目(2022YFH0048); 四川大學中央高校基本科研業務費(YJ201985); 口腔疾病研究國家重點實驗室開放課題(SKLOD2022KXK0403); 四川大學大學生創新創業訓練計劃(C202210610203)
作者簡介: ??東寶瑜(1997-), 女, 甘肅天祝人, 碩士研究生, 研究方向為公共衛生. E-mail: 1226046785@qq.com
通訊作者: ?曾菊梅.E-mail: zengjumei@scu.edu.cn
Effect of ?Scutellaria baicalensis ?extract on the growth and ?biofilm formation of ?Mycobacterium abscessus
DONG Bao-Yu ?1, XU Xin-Yue ?1, LI Shu-Hua ?1, LI Shuai ?2, ZENG Xue-Ting ?3, ?WANG Yu-Meng ?1, SUN Kun ?1, WANG Chuan ??1, ZENG Ju-Mei ??1
(1. Research Center for Poisoning Treatment, Laboratory Science & Precision Prevention, West China-PUMC C.C. Chen ?Institute of Health, West China School of Public Health and West China Fourth Hospital, Sichuan University, ?Chengdu 610041, China; 2.Sichuan Academy of Chinese Medicine Sciences, Chengdu 610041, China;
3.Department of Medicament, Army Characteristic Medical Center, Army Medical University, Chongqing 400042, China)
To study the effect of ?Scutellaria baicalensis ?extract on ?Mycobacterium abscessus , the standard strain of ?M. abscessus ?ATCC 19977 and clinical isolates were used as the test bacteria. The minimum inhibitory concentration (MIC) of ?S. baicalensis ?extract against ?M. abscessus ?was determined by the Alarmar-Blue method; the minimum bactericidal concentration (MBC) was determined by plate coating method; crystal violet staining method and scanning electron microscope assay were used to analyze the effect of ?S. baicalensis ?extract on the biomass formation and morphological structure of ?M. abscessus ; RT-qPCR was further used to investigate the effect of ?S. baicalensis ?extract on the gene expression which involves in mycolic acid synthesis. The inhibitory effects of ?S. baicalensis ?extract against ?M. abscessus ?standard strain ATCC 19977 and 8 clinical isolates were evaluated, the results showed that the MIC ?90 was 50~100 mg/mL, and the MBC was 50~200 mg/mL. The biofilm formation of ?M. abscessus ?was significantly decreased after adding ?S. baicalensis ?extract( P <0.05), and ?S. baicalensis ?extract disrupted the biofilm formation. The expression of genes related to mycolic acid synthesis was significantly decreased in the ?S. baicalensis ?extract treatment group ( P< 0.01). ?S. baicalensis ?extract inhibits planktonic ?M. abscessus ?growth; meanwhile, it reduces the bacterial adhesion and aggregation on ?M. abscessus ?biofilm formation.
S. baicalensis ?extract; ?M. abscessus ; Planktonic ??growth; Biofilm inhibition
1 引 言
膿腫分枝桿菌( Mycobacterium abscessus, M. ab )是一種常見的致病性非結核分枝桿菌(nontuberculosis mycobacteria, NTM),屬于快速生長型分枝桿菌,通常引起炎癥性肺部感染(如囊性纖維化)以及嚴重的皮膚、關節、軟組織、手術部位和播散性感染 ?[1,2].抗生素治療是當前首選的治療方案,然而,該細菌自身的外膜脂質屏障低滲透性、藥物的修飾滅活酶、外排泵系統及靶點突變等因……