Acta Veterinaria et Zootechnica Sinica ›› 2020, Vol. 51 ›› Issue (4): 841-850.doi: 10.11843/j.issn.0366-6964.2020.04.021

• BASIC VETERINARY MEDICINE • Previous Articles     Next Articles

The Study of Copper Sulfate Solution Induction on the Resistance Effect of Methicillin-resistant Staphylococcus aureus

LUO Mengyou1,2, TANG Cheng1,2, ZHAO Yanying1,2, CHEN Juan1,2, TANG Junni1,2*   

  1. 1. College of Life Sciences and Technology, Southwest Minzu University, Chengdu 610041, China;
    2. Key Laboratory of Qinghai-Tibet Plateau Animal Genetic Resource and Utilization, Southwest Minzu University, Chengdu 610041, China
  • Received:2019-10-29 Online:2020-04-25 Published:2020-04-21

Abstract: The study aimed to investigate the effects of copper sulfate solution continuous induction on the antibiotic resistance ability and the expression of related resistance genes of methicillin-resistant Staphylococcus aureus(MRSA) isolates. The minimum inhibitory concentrations(MICs) of MRSA strains (MR-YB1224, MR-YS3 and MR-P318) to copper sulfate, β-lactam(including ampicillin, oxacillin and cefoxitin), fluoroquinolones(including ofloxacin), macrolides(including roxithromycin) and aminoglycosides(including streptomycin) were determined using the standard broth microdilution method. A quantitative real time-PCR was applied to monitor relative expression levels of anti-heavy metal genes (copA, arsB) and antibiotic resistance genes (mecA, norA, ermB, aac6'/aph2″). After continuous induction by copper sulfate solution for 7 days, the MIC values to copper sulfate solution increased for three MRSA strains; especially the MIC values to β-lactam antibiotics significantly increased after induction (P<0.05). The change of MIC values to the different antibiotics were as follows:oxacillin > ampicillin > cefoxitin > ofloxacin > streptomycin > roxithromycin. In addition, the expression of the anti-heavy metal genes and related antibiotic resistance genes for the three MRSA strains were significantly up-regulated (P<0.05). The results show that copper sulfate solution has a strong synergistic effect on the antibiotic resistance of MRSA strains.

Key words: Staphylococcus aureus, copper sulfate solution, induction, antibiotic resistance, anti-heavy metal genes, RT-PCR

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