Evidence map›Paper›PMID 21746856›Full record

ArticleInfection and immunity2011

Attaching and effacing bacterial effector NleC suppresses epithelial inflammatory responses by inhibiting NF-κB and p38 mitogen-activated protein kinase activation.

Ho Pan Sham, Stephanie R Shames, Matthew A Croxen, Caixia Ma, Justin M Chan, Mohammed A Khan, Mark E Wickham, Wanyin Deng, B Brett Finlay, Bruce A Vallance

Open access · greenAbstract read
In one paragraph

Article in Infection and immunity, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 55 papers.

0numbers the graph read from it
0cells of the map it votes in
55citing papers in PubMed
5.8field-weighted citation impact, top 3% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

55 citing papers in PubMed, 93 citations in OpenAlex.

  1. Article
  2. Article
  3. Article
  4. Review
  5. Speaking the host language: howMicrobiology (Reading, England) · 2023
    Review
  6. Article
  7. Effect and Mechanism Analysis of PigInternational journal of molecular sciences · 2022
    Article
  8. Review
  9. Article
  10. Article
  11. Article
  12. The T3SS Effector Protease NleC Is Active withinPathogens (Basel, Switzerland) · 2021
    Article
  13. Article
  14. Article
  15. Review
  16. Effect of α-Hemolysin ProducingMicroorganisms · 2020
    Article
  17. Ulcerative Colitis-associatedGut microbes · 2020
    Article
  18. Bacteria-Catalyzed Arginine Glycosylation in Pathogens and Host.Frontiers in cellular and infection microbiology · 2020
    Review
  19. Review
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

10 authors at 2 institutions in 1 country.

Ho Pan ShamDivision of Gastroenterology, BC's Children's Hospital, Vancouver, British Columbia, Canada V6H 3V4.
Stephanie R Shames
Matthew A Croxen
Caixia Ma
Justin M Chan
Mohammed A Khan
Mark E Wickham
Wanyin Deng
B Brett Finlay
Bruce A Vallance
University of British Columbia · CACanada's Michael Smith Genome Sciences Centre · CA

Funding

Canadian Institutes of Health Research
6 · The paper itself

Abstract

Enteropathogenic Escherichia coli (EPEC) and enterohemorrhagic E. coli are noninvasive attaching and effacing (A/E) bacterial pathogens that cause intestinal inflammation and severe diarrheal disease. These pathogens utilize a type III secretion system to deliver effector proteins into host epithelial cells, modulating diverse cellular functions, including the release of the chemokine interleukin-8 (IL-8). While studies have implicated the effectors NleE (non-locus of enterocyte effacement [LEE]-encoded effector E) and NleH1 in suppressing IL-8 release, by preventing NF-κB nuclear translocation, the impact of these effectors only partially replicates the immunosuppressive actions of wild-type EPEC, suggesting another effector or effectors are involved. Testing an array of EPEC mutants, we identified the non-LEE-encoded effector C (NleC) as also suppressing IL-8 release. Infection by ΔnleC EPEC led to exaggerated IL-8 release from infected Caco-2 and HT-29 epithelial cells. NleC localized to EPEC-induced pedestals, with signaling studies revealing NleC inhibits both NF-κB and p38 mitogen-activated protein kinase (MAPK) activation. Using Citrobacter rodentium, a mouse-adapted A/E bacterium, we found that ΔnleC and wild-type C. rodentium-infected mice carried similar pathogen burdens, yet ΔnleC strain infection led to worsened colitis. Similarly, infection with ΔnleC C. rodentium in a cecal loop model induced significantly greater chemokine responses than infection with wild-type bacteria. These studies thus advance our understanding of how A/E pathogens subvert host inflammatory responses.

Indexed as

AnimalsBacterial AdhesionCaco-2 CellsChemokinesCitrobacter rodentiumColitisEnterobacteriaceae InfectionsEnteropathogenic Escherichia coliEpithelial CellsEscherichia coli ProteinsFluorescent Antibody TechniqueHT29 CellsHumansInterleukin-8MiceMice, Inbred C57BLChemokinesEscherichia coli ProteinsInterleukin-8NF-kappa Bp38 Mitogen-Activated Protein KinasesZ0986 protein, E coli

Identifiers

PMID21746856
PMCPMC3165486
OpenAlexW2104053696

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.