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Oxidative damage to Pseudomonas aeruginosa ATCC 27833 and Staphylococcus aureus ATCC 24213 induced by CuO-NPs

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Abstract

The cytotoxicity of nanoparticles (NPs) and their properties are important issues in nanotechnology research. Particularly, NPs affect the metabolism of microorganisms due to NP interactions with some biomolecules. In order to assess the mechanisms underlying NPs toxicity, we studied the damage caused by copper oxide nanoparticles (CuO-NPs) on Staphylococcus aureus ATCC 24213 and Pseudomonas aeruginosa ATCC 27833. Spherical CuO-NPs characterized by their diameter (13 ± 3 nm) were synthesized with a maximum of 254 nm. These NPs reduced cell viability, with a minimum inhibitory concentration (MIC) of 500 and 700 ppm for Staphylococcus aureus and Pseudomonas aeruginosa, respectively. Surfactant was added to reduce the NP agglomeration, but it did not present any effect. The mechanism of CuO-NPs as antimicrobial agent was assessed by analyzing solubilized Cu2+, quantifying DNA release in the culture media, and measuring intracellular reactive oxygen species (ROS). CuO-NPs induced severe damage on cells as revealed by confocal optical microscopy and scanning electron microscopy (SEM). Our results indicated that CuO-NPs interacted with bacteria, triggering an intracellular signaling network which produced oxidative stress, leading to ROS generation. Finally, we concluded that CuO-NPs exhibited higher antibacterial activity on Gram-negative bacteria than on Gram-positive ones.

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Acknowledgments

This work was supported by CONACyT-ConsejoNacional de Ciencia y Tecnología No. 175089 and ECOS NORD 263456. All authors contributed, read, and approved the final manuscript. The authors have declared no conflict of interest. The authors thank W. Antunez-Flores and Ochoa-Gamboa R.A. for technical support in electronic microscopy.

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Authors and Affiliations

  1. Universidad Autónoma de Chihuahua Circuito No. 1, Nuevo Campus Universitario, Apdo. Postal 1552, 31240, Chihuahua, Chihuahua, México

    Ana Laura Ulloa-Ogaz, Hilda Amelia Piñón-Castillo, Laila Nayzzel Muñoz-Castellanos, Martha Samira Athie-García & María De Lourdes Ballinas-Casarrubias

  2. Centro de Investigación en Materiales Avanzados, S. C. Miguel de Cervantes 120, Complejo Industrial Chihuahua, 31109, Chihuahua, Chihuahua, México

    José Guadalupe Murillo-Ramirez & Erasmo Orrantia-Borunda

  3. Carl Zeiss, Col. Miguel Angel de Quevedo 496, Col. Santa Catarina, 04010, Coyoacán, México

    Luis Ángel Flores-Ongay

  4. Equipe Environment et Microbiologie, MELODY Group, UMR IPREM5254, IBEAS, Université de Pau et des Pays de l’Adour, Pau, France

    Robert Duran

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  1. Ana Laura Ulloa-Ogaz
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Correspondence to Ana Laura Ulloa-Ogaz or Hilda Amelia Piñón-Castillo.

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Ulloa-Ogaz, A.L., Piñón-Castillo, H.A., Muñoz-Castellanos, L.N. et al. Oxidative damage to Pseudomonas aeruginosa ATCC 27833 and Staphylococcus aureus ATCC 24213 induced by CuO-NPs. Environ Sci Pollut Res 24, 22048–22060 (2017). https://doi.org/10.1007/s11356-017-9718-6

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