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Toll‐like receptor signalling induces the expression of serum amyloid A in epidermal keratinocytes and dermal fibroblasts
- Source :
- Clinical and Experimental Dermatology. 44(1):40-46
- Publication Year :
- 2018
- Publisher :
- Wiley, 2018.
-
Abstract
- BACKGROUND: Toll-like receptors (TLRs) play critical roles in innate immune response by sensing pathogen- or damage-associated molecular patterns. Epidermal keratinocytes and dermal fibroblasts also produce proinflammatory cytokines and chemokines under stimulation with TLR ligands. Serum amyloid A (SAA) is an essential factor in the pathogenesis of secondary amyloidosis, and also has immunomodulatory functions. SAA are produced mainly by hepatocytes but also by a variety of cells, including immune cells, endothelial cells, synoviocytes, and epidermal keratinocytes. However, SAA expression in human dermal fibroblasts has not been shown to date. AIM: To investigate the effect of TLR ligands on SAA expression in epidermal keratinocytes and dermal fibroblasts. METHODS: We investigated whether TLR ligands induce the expression of SAA in normal human epidermal keratinocytes (NHEKs) and normal human dermal fibroblasts (NHDFs) by real-time quantitative PCR and ELISA. The effect of SAA on its own expression in NHDFs was also studied. RESULTS: SAA expression was induced via nuclear factor-κB by TLR1/2, 3, 5 and 2/6 ligands in NHEKs. In NHDFs, TLR1/2 and TLR2/6 ligands increased SAA expression. SAA further induced its own expression via TLR1/2 and NF-κB in NHDFs, as previously reported for NHEKs. CONCLUSIONS: Our results provide new evidence that the skin's innate immune response contributes to the production of SAA, which might lead to an increased risk of systemic complications such as secondary amyloidosis of recessive dystrophic epidermolysis bullosa.
- Subjects :
- Keratinocytes
Chemokine
animal diseases
Enzyme-Linked Immunosorbent Assay
Dermatology
Ligands
Real-Time Polymerase Chain Reaction
Proinflammatory cytokine
030207 dermatology & venereal diseases
03 medical and health sciences
0302 clinical medicine
Immune system
Proto-Oncogene Proteins
Humans
Serum amyloid A
RNA, Small Interfering
Receptor
Cells, Cultured
Skin
Toll-like receptor
Serum Amyloid A Protein
Innate immune system
biology
integumentary system
Chemistry
Toll-Like Receptors
Fibroblasts
stomatognathic diseases
TLR2
030220 oncology & carcinogenesis
biology.protein
Cancer research
Trans-Activators
Subjects
Details
- Language :
- English
- ISSN :
- 03076938
- Volume :
- 44
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- Clinical and Experimental Dermatology
- Accession number :
- edsair.doi.dedup.....1f91afaa6057a48e32442e02d4298fc2