The Cathelicidin Anti-Microbial Peptide LL-37 is Involved in Re-Epithelialization of Human Skin Wounds and is Lacking in Chronic Ulcer Epithelium
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The human cathelicidin anti-microbial protein, hCAP18 is a component of the innate immune system and has broad anti-microbial activity conferred by its C-terminal fragment LL-37. hCAP18 is constitutively produced in leukocytes and is induced in barrier organs upon inflammation and infection. We demonstrate here a novel role for this peptide in re-epithelialization of skin wounds. We show that high levels of hCAP18 are produced in skin in vivo upon wounding. The highest hCAP18 levels are attained at 48 h post-injury, declining to pre-injury levels upon wound closure. hCAP18 is detected in the inflammatory infiltrate and in the epithelium migrating over the wound bed. In chronic ulcers, however, hCAP18 levels are low and immunoreactivity for hCAP18/LL-37 is absent in ulcer edge epithelium. Using a noninflammatory ex vivo wound healing model, composed of organ-cultured human skin, we show that hCAP18 is strongly expressed in healing skin epithelium, and that treatment with antibodies raised and affinity purified against LL-37, inhibits re-epithelialization in a concentration-dependent manner. Immunoreactivity for the proliferation marker Ki67 is absent in the epithelium of such inhibited wounds, suggesting that LL-37 may play a part in epithelial cell proliferation. Thus, we suggest that, in addition to being an anti-microbial peptide, LL-37 also plays a part in wound closure and that its reduction in chronic wounds impairs re-epithelialization and may contribute to their failure to heal.
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Abnormal or dysfunctional AMP production has been associated with susceptibility to microbial infections and several other cutaneous diseases, including nonhealing wounds.
“Abnormal or dysfunctional AMP production has been associated with susceptibility to microbial infections and several other cutaneous diseases, including nonhealing wounds.29”
From The Innate Immune System in Acute and Chronic Wounds (2016) · cites this paper as [29]
Wound fluids and skin wounds show elevated levels of cathelicidin expression in keratinocytes and other immune cells, reaching a maximum at 48 h.
“Wound fluids and skin wounds show elevated levels of cathelicidin expression in keratinocytes and other immune cells, reaching a maximum at 48 h.29”
From The Innate Immune System in Acute and Chronic Wounds (2016) · cites this paper as [29]
Using a noninflammatory ex vivo wound healing model comprising organ-cultured human skin, hCAP18 is strongly expressed in healing skin epithelium and treatment with affinity-purified antibodies raised against LL-37 inhibits reepithelialization in a concentration-dependent manner.
“Using a noninflammatory ex vivo wound healing model comprising organ-cultured human skin, it has been shown that hCAP18 is strongly expressed in healing skin epithelium and that treatment with affinity-purified antibodies raised against LL-37 inhibits reepithelialization in a concentration-dependent manner.29”
From The Innate Immune System in Acute and Chronic Wounds (2016) · cites this paper as [29]
Cathelicidin is low in venous leg ulcers and absent at the margin of other nonhealing wounds.
“Cathelicidin is low in venous leg ulcers and absent at the margin of other nonhealing wounds.29”
From The Innate Immune System in Acute and Chronic Wounds (2016) · cites this paper as [29]
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“Using a noninflammatory ex vivo wound healing model comprising organ-cultured human skin, it has been shown that hCAP18 is strongly expressed in healing skin epithelium and that treatment with affinity-purified antibodies raised against LL-37 inhibits reepithelialization in a concentration-dependent manner.(29) Induct…”
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- Authors
- Heilborn, J. D., Nilsson, M. F., Sørensen, O., Ståhle-Bäckdahl, M., Kratz, G., Weber, G., & Borregaard, N.
- Affiliations
- Karolinska Institutet (SE)
- Rigshospitalet (DK)
- Venue
- Journal of Investigative Dermatology
- Publisher
- Elsevier BV
- Published
- 2003-03
- Volume
- 120
- Issue
- 3
- Pages
- 379-389
- ISSN
- 0022-202X (ISSN-L)
- OpenAlex
- W2072432297
- Cited by
- 572
- References
- 44
- Citations by year
- 2026: 16 · 2025: 13 · 2024: 15 · 2023: 22 · 2022: 19 · 2021: 28 · 2020: 17 · 2019: 15 · 2018: 21 · 2017: 28 · 2016: 28 · 2015: 25 · 2014: 25 · 2013: 33 · 2012: 39
- FWCI
- 24.02
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Journal of Investigative Dermatology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Rehabilitation › Wound Healing and Treatments
- Life Sciences › Immunology and Microbiology › Microbiology › Antimicrobial Peptides and Activities
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › S100 Proteins and Annexins
- Keywords
- LL-37, cathelicidin, hCAP18, re-epithelialization, skin wound healing, chronic wounds, chronic ulcers, epithelial cell proliferation, Ki-67, innate immunity, antimicrobial peptides, antibody inhibition
- MeSH terms
- Antibodies, Bacillus megaterium, Chronic Disease, Dose-Response Relationship, Drug, Epithelium, Humans, Immune Sera, Leg Ulcer, Organ Culture Techniques, Skin, Wound Healing, Wounds, Penetrating, Keratinocytes, Ki-67 Antigen, Antimicrobial Cationic Peptides, Cathelicidins
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