Toll-like receptor signalling induces the expression of serum amyloid A in epidermal keratinocytes and dermal fibroblasts

Clinical and Experimental Dermatology
S MorizaneKeiji Iwatsuki

Abstract

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. To investigate the effect of TLR ligands on SAA expression in epidermal keratinocytes and dermal fibroblasts. 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. 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 previ...Continue Reading

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Oct 25, 2016·The Journal of Investigative Dermatology·Shin MorizaneKeiji Iwatsuki

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Citations

Apr 25, 2019·International Journal of Molecular Sciences·Alan V Nguyen, Athena M Soulika
Dec 10, 2019·Journal of Immunology Research·Lixiang SunLing-Juan Zhang

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