Chronic exposure to complex metal oxide nanoparticles elicits rapid resistance in: Shewanella oneidensis MR-1

Stephanie L. Mitchell, Natalie V. Hudson-Smith, Meghan S. Cahill, Benjamin N. Reynolds, Seth D. Frand, Curtis M. Green, Chenyu Wang, Mimi N. Hang, Rodrigo Tapia Hernandez, Robert J. Hamers, Z. Vivian Feng, Christy L. Haynes, Erin E. Carlson

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Engineered nanoparticles are incorporated into numerous emerging technologies because of their unique physical and chemical properties. Many of these properties facilitate novel interactions, including both intentional and accidental effects on biological systems. Silver-containing particles are widely used as antimicrobial agents and recent evidence indicates that bacteria rapidly become resistant to these nanoparticles. Much less studied is the chronic exposure of bacteria to particles that were not designed to interact with microorganisms. For example, previous work has demonstrated that the lithium intercalated battery cathode nanosheet, nickel manganese cobalt oxide (NMC), is cytotoxic and causes a significant delay in growth of Shewanella oneidensis MR-1 upon acute exposure. Here, we report that S. oneidensis MR-1 rapidly adapts to chronic NMC exposure and is subsequently able to survive in much higher concentrations of these particles, providing the first evidence of permanent bacterial resistance following exposure to nanoparticles that were not intended as antibacterial agents. We also found that when NMC-adapted bacteria were subjected to only the metal ions released from this material, their specific growth rates were higher than when exposed to the nanoparticle. As such, we provide here the first demonstration of bacterial resistance to complex metal oxide nanoparticles with an adaptation mechanism that cannot be fully explained by multi-metal adaptation. Importantly, this adaptation persists even after the organism has been grown in pristine media for multiple generations, indicating that S. oneidensis MR-1 has developed permanent resistance to NMC.

Original languageEnglish (US)
Pages (from-to)9768-9781
Number of pages14
JournalChemical Science
Issue number42
StatePublished - 2019

Bibliographical note

Funding Information:
This work was supported by the National Science Foundation under the Center for Sustainable Nanotechnology, CHE-1503408. The Center for Sustainable Nanotechnology is part of the Centers for Chemical Innovation Program. S. Mitchell acknowledges support through a NIH Chemistry-Biology Interface Training Grant 5T32GM008700-18. N. Hudson-Smith acknowledges support through the National Science Foundation Graduate Research Fellowship Program (00039202). Parts of this work were carried out in the Characterization Facility, University of Minnesota, which receives partial support from NSF through the MRSEC program. The authors gratefully acknowledge use of shared transmission electron microscopy instrumentation in the UW Madison Materials Science Center, which is partially supported by NSF through the University of Wisconsin Materials Research Science and Engineering Center (DMR-1720415). We thank J. Buchman for helpful discussion.

Publisher Copyright:
© The Royal Society of Chemistry 2019.

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  • Shared

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  • Journal Article


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