Ultraviolet Light-Emitting-Diode Irradiation Inhibits TNF-α and IFN-γ-Induced Expression of ICAM-1 and STAT1 Phosphorylation in Human Keratinocytes

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Background and Objectives:

Ultraviolet light-emitting diodes (UV-LEDs) are a novel light source for phototherapy. This research investigated the in vitro safety and efficacy of UV-LEDs as a phototherapeutic device for atopic dermatitis (AD).

Study Design/Materials and Methods:

Human keratinocytes and fibroblasts were irradiated by UV-LEDs with a center wavelength of 310 and 340 nm. We examined the effects of UV-LED irradiation on the suppression of TNF-α/IFN-γ-induced activation of STAT1 and ICAM-1 and on NF-κB expression; we used the following methods: cell viability assay, reverse transcription-polymerase chain reaction, enzyme-linked immunosorbent assay, Western blotting, and immunocytochemistry.


We observed anti-inflammatory responses through the suppression of TNF-α/IFN-γ-induced expression of TARC and MCP-1/CCL2, IL-1beta, IL-6, and sICAM-1 via blockage of ICAM-1 activation and subsequent activation of STAT1 and NF-κB. The results suggested that UV-LED irradiation inhibited ICAM expression by suppressing TNF-α/IFN-γ-induced NF-κB activation in vitro.


We concluded that novel UV-LED (310 and 340 nm) modalities were effective for the treatment of AD and may be promising for the treatment of inflammatory skin diseases. Lasers Surg. Med. 47:824–832, 2015. © 2015 Wiley Periodicals, Inc.

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