Cited by 213Antimicrobial Peptides and ActivitiesSkin and Cellular Biology ResearchAntimicrobial agents and applications

Keratinocytes store the antimicrobial peptide cathelicidin in lamellar bodies

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Braff, Marissa H., Nardo, Anna Di, Gallo, Richard L.·2005·Journal of Investigative Dermatology

Abstract

Innate immune defense against microbial pathogens occurs by physical barriers, by recruitment of cells such as neutrophils, NK cells, and macrophages, and by secretion of molecules with antimicrobial activity. Such molecules are produced by various epithelia including skin. The importance of antimicrobial peptides has been shown in cathelicidin-deficient mice, which have increased susceptibility to skin infection by Streptococcus. Although keratinocytes increase cathelicidin expression upon injury, their role relative to neutrophil cathelicidin and their sites of peptide storage and activation have not been elucidated. Herein, it is reported that cathelicidin predominantly resides in granules of the superficial epidermis and partially localizes in lamellar bodies as determined by immunogold electron microscopy and immunoblot of lamellar bodies isolated from mice. In cultured keratinocytes, cathelicidin displays a granular distribution and partially localizes within the Golgi apparatus. Cathelicidin processing can be observed by western blot analysis in keratinocyte extracts but not in conditioned media. Further, fluorescent bacteria colocalize with cathelicidin in granules both intracellularly and at the cell surface. These observations illustrate the immune defense potential of keratinocytes acting directly through storage and processing of antimicrobial peptides.

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Crossref · 10.1111/j.0022-202x.2004.23443.x

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  • Many antimicrobial peptides are stored in the lysosomes of macrophages and polymorphonuclear leukocytes, where they are part of the oxygen-independent activity against pathogens.

    “Many antimicrobial peptides are stored in the lysosomes of macrophages and polymorphonuclear leukocytes, where they are part of the oxygen-independent activity against pathogens [177,178].”

    From The Role of Reactive Species on Innate Immunity (2022) · cites this paper as [177]

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Authors
Braff, M. H., Nardo, A. D., & Gallo, R. L.
Affiliations
University of California San Diego (US)
Corresponding author
Gallo, Richard L.
Venue
Journal of Investigative Dermatology
Publisher
Elsevier BV
Published
2005-02
Volume
124
Issue
2
Pages
394-400
ISSN
0022-202X (ISSN-L)
OpenAlex
W2066902095
Cited by
213
References
36
Citations by year
2026: 3 · 2025: 4 · 2024: 11 · 2023: 3 · 2022: 9 · 2021: 16 · 2020: 9 · 2019: 7 · 2018: 9 · 2017: 3 · 2016: 11 · 2015: 13 · 2014: 7 · 2013: 21 · 2012: 12
FWCI
11.71
Type
journal article
Language
en
Open access
Locations
  • Journal of Investigative Dermatology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute of Allergy and Infectious Diseases (AI 052453)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK-07202, T32DK007202)
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (AR 45676, R01AR045676)
Topics
  • Life Sciences › Immunology and Microbiology › Microbiology › Antimicrobial Peptides and Activities
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Skin and Cellular Biology Research
  • Physical Sciences › Chemistry › Organic Chemistry › Antimicrobial agents and applications
Keywords
cathelicidin, keratinocytes, lamellar bodies, antimicrobial peptides, innate immunity, skin barrier, Golgi apparatus, peptide processing
MeSH terms
Epidermal Cells, Cells, Cultured, Cytoplasmic Granules, Escherichia coli, Escherichia coli Infections, Golgi Apparatus, Humans, Microscopy, Electron, Microscopy, Fluorescence, Protein Precursors, Keratinocytes, Antimicrobial Cationic Peptides, Cathelicidins

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