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Thickening of the cell wall in macrolide-resistant Staphylococcus aureus

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Abstract

Macrolides are widely used at low dosage for long-term therapy of chronic sinusitis. Twenty clinical macrolide-resistant Staphylococcus aureus strains were morphologically compared with 10 clinical macrolide-sensitive strains. PCR amplification was performed to determine the presence of four known macrolide resistance genes. Transmission electron microscopy revealed significantly thicker cell walls in clinical macrolide-resistant strains. Even though the ultrastructural characteristics were shared by all macrolide-resistant strains, they were not associated with the presence or absence of the known macrolide-resistance genes. We also demonstrated that macrolide-resistant mutant strains derived in vitro from a macrolide-sensitive parent strain had thickened cell walls and did not harbor the known macrolide-resistance genes. These results, therefore, revealed that macrolide-resistant S. aureus strains have thickened cell walls as a common ultrastructural characteristic and that cell wall thickening is likely mediated by an unknown gene which is unrelated to any known macrolide resistance gene.

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Acknowledgments

We thank Mr. K. Uehira, Mr. T. Suda and Ms. K. Yamane from the Electron Microscope Centre, and Ms. S. Ohmori from the Department of Microbiology, Kawasaki Medical School, for excellent technical assistance. This work was supported by Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports and Technology Japan (21592183, 23791947) and research project grants 19-404M, 20-411I and 23S-2 from Kawasaki Medical School, Japan.

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Correspondence to Yukiyoshi Hyo.

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Hyo, Y., Yamada, S., Fukutsuji, K. et al. Thickening of the cell wall in macrolide-resistant Staphylococcus aureus . Med Mol Morphol 46, 217–224 (2013). https://doi.org/10.1007/s00795-013-0027-y

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  • DOI: https://doi.org/10.1007/s00795-013-0027-y

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