Cited by 1,082Antibiotic Resistance in BacteriaDrug Transport and Resistance MechanismsBacterial Genetics and Biotechnology

Efflux-mediated antimicrobial resistance

Poole, Keith·2005·Journal of Antimicrobial Chemotherapy

Abstract

Antibiotic resistance continues to plague antimicrobial chemotherapy of infectious disease. And while true biocide resistance is as yet unrealized, in vitro and in vivo episodes of reduced biocide susceptibility are common and the history of antibiotic resistance should not be ignored in the development and use of biocidal agents. Efflux mechanisms of resistance, both drug specific and multidrug, are important determinants of intrinsic and/or acquired resistance to these antimicrobials, with some accommodating both antibiotics and biocides. This latter raises the spectre (as yet generally unrealized) of biocide selection of multiple antibiotic-resistant organisms. Multidrug efflux mechanisms are broadly conserved in bacteria, are almost invariably chromosome-encoded and their expression in many instances results from mutations in regulatory genes. In contrast, drug-specific efflux mechanisms are generally encoded by plasmids and/or other mobile genetic elements (transposons, integrons) that carry additional resistance genes, and so their ready acquisition is compounded by their association with multidrug resistance. While there is some support for the latter efflux systems arising from efflux determinants of self-protection in antibiotic-producing Streptomyces spp. and, thus, intended as drug exporters, increasingly, chromosomal multidrug efflux determinants, at least in Gram-negative bacteria, appear not to be intended as drug exporters but as exporters with, perhaps, a variety of other roles in bacterial cells. Still, given the clinical significance of multidrug (and drug-specific) exporters, efflux must be considered in formulating strategies/approaches to treating drug-resistant infections, both in the development of new agents, for example, less impacted by efflux and in targeting efflux directly with efflux inhibitors.

Integrity signals

Registry

Crossref · 10.1093/jac/dki171

Cites

733 of 733 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

This paper’s full text isn’t openly available, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Many Tet pumps affect tetracycline and doxycycline but do not decrease minocycline or tigecycline susceptibility, because they cannot use these compounds as substrates.

    “Importantly, many of these pumps affect tetracycline and doxycycline, but do not decrease minocycline or tigecycline susceptibility, as they are not able to use these compounds as substrates (44, 47).”

    From Mechanisms of Antibiotic Resistance (2016) · cites this paper as [44]

  • Lsa is a predicted efflux pump encoded by the chromosomal gene lsa that is responsible for intrinsic resistance of E. faecalis to lincosamides and streptogramin A, the LSA phenotype.

    “Finally, another predicted efflux pump is Lsa (encoded by the chromosomal gene lsa), which is responsible for the intrinsic resistance of E. faecalis to lincosamides and streptogramin A (LSA phenotype) (44, 45).”

    From Mechanisms of Antibiotic Resistance (2016) · cites this paper as [44]

  • Efflux systems may be substrate-specific or have broad substrate specificity, and broad-specificity systems are usually found in MDR bacteria.

    “These systems may be substrate-specific (for a particular antibiotic such as tet determinants for tetracycline and mef genes for macrolides in pneumococci) or with broad substrate specificity, which are usually found in MDR bacteria (44).”

    From Mechanisms of Antibiotic Resistance (2016) · cites this paper as [44]

Cites

1 retracted

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Poole, K.
Affiliations
Queen's University (CA)
Corresponding author
Poole, Keith
Venue
Journal of Antimicrobial Chemotherapy
Published
2005-05-24
Volume
56
Issue
1
Pages
20-51
ISSN
  • 0305-7453 (ISSN-L)
  • 1460-2091
OpenAlex
W2131256712
Cited by
1,082
References
733
Citations by year
2026: 37 · 2025: 50 · 2024: 54 · 2023: 54 · 2022: 43 · 2021: 63 · 2020: 57 · 2019: 52 · 2018: 48 · 2017: 52 · 2016: 70 · 2015: 52 · 2014: 61 · 2013: 57 · 2012: 54
FWCI
2.24
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Antimicrobial Chemotherapy (publishedVersion)
  • PubMed (publishedVersion)
  • HighWire Press Open Archive (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Medicine › Antibiotic Resistance in Bacteria
  • Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
Keywords
efflux-mediated resistance, antimicrobial resistance, multidrug efflux pumps, biocide resistance, multidrug resistance, plasmid-encoded resistance genes, integrons, transposable elements, mobile genetic elements, efflux pump inhibitors, Gram-negative bacteria, intrinsic resistance, acquired resistance
MeSH terms
Aminoglycosides, Anti-Bacterial Agents, Biological Transport, Chloramphenicol, Tetracycline, Fluoroquinolones, Drug Resistance, Bacterial, Drug Resistance, Multiple, Bacterial

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review