Cited by 87Calpain Protease Function and RegulationImmune Response and InflammationCell Adhesion Molecules Research

TLR2-induced calpain cleavage of epithelial junctional proteins facilitates leukocyte transmigration

Open access
Chun, Jarin, Prince, Alice·2009·Cell Host & Microbe

Abstract

Recruitment of polymorphonuclear leukocytes (PMNs) into the lungs in response to inhaled pathogens is initiated by epithelial signaling, the activation of toll-like receptors (TLRs), and the production of the chemokine interleukin-8. To reach the site of infection, PMNs must be mobilized through epithelial junctions. Here, we demonstrate that Ca(2+) fluxes generated by TLR2 signals activate calpains, Ca(2+)-dependent cysteine proteases. These activated calpains cleave the transmembrane junctional proteins occludin and E-cadherin without breaching the integrity of the epithelial barrier. Calpain inhibitors decrease PMN transepithelial migration in response to TLR2 agonists both in vitro and in a mouse model of P. aeruginosa infection. Thus, TLR2 signaling in the airway not only induces chemokine expression to recruit PMNs, but also initiates cleavage of junctional proteins to accommodate transmigration of the recruited PMNs.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1016/j.chom.2008.11.009

Cites

56 of 56 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

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?

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Chun, J., & Prince, A.
Affiliations
Columbia University (US)
Corresponding author
Prince, Alice
Venue
Cell Host & Microbe
Publisher
Elsevier BV
Published
2009-01
Volume
5
Issue
1
Pages
47-58
ISSN
1931-3128 (ISSN-L)
OpenAlex
W2033019676
Cited by
87
References
56
Citations by year
2026: 1 · 2025: 3 · 2024: 3 · 2023: 2 · 2022: 2 · 2021: 4 · 2020: 1 · 2019: 3 · 2018: 5 · 2017: 5 · 2016: 4 · 2015: 5 · 2014: 1 · 2013: 14 · 2012: 8
FWCI
5.04
Type
journal article
Language
en
Open access
Locations
  • Cell Host & Microbe (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health
  • National Heart, Lung, and Blood Institute (HL73989, R01HL073989)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK039693)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Calpain Protease Function and Regulation
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Health Sciences › Medicine › Immunology and Allergy › Cell Adhesion Molecules Research
Keywords
TLR2 signaling, calpain, occludin, E-cadherin, neutrophil transmigration, polymorphonuclear leukocytes, airway epithelium, calcium flux, interleukin-8, Pseudomonas aeruginosa infection, epithelial barrier integrity, cysteine protease
MeSH terms
Animals, Calcium, Calpain, Cell Line, Cell Movement, Epithelial Cells, Humans, Intercellular Junctions, Leukocytes, Membrane Proteins, Mice, Inbred C57BL, Pseudomonas Infections, Cadherins, Pneumonia, Bacterial, Toll-Like Receptor 2, Mice, Cell Migration Assays, Leukocyte, Occludin

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