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UVA1 radiation (340–400 nm) interferes with the perforin-granule system of CD8hi+ cytotoxic T lymphocytes in vitro

Paper ID Volume ID Publish Year Pages File Format Full-Text
30882 44511 2006 8 PDF Available
Title
UVA1 radiation (340–400 nm) interferes with the perforin-granule system of CD8hi+ cytotoxic T lymphocytes in vitro
Abstract

UVA1-irradiation was introduced as an innovative and effective phototherapy of atopic dermatitis (AD) and other skin diseases. In AD, a defect of a central apoptosis inducing effector system involved in immunoregulation and immune defense, i.e., the system of perforin-granules in cytotoxic T lymphocytes (CTL), was recently reported: perforin-reduction and perforin-hyperreleasability. We now investigated UVA1-effects on the perforin-granule system in vitro. Peripheral blood CTLs were exposed in vitro to 10–100 J/cm2 UVA1 (340–400 nm), and to 30–150 mJ/cm2 UVB (280–315 nm) as a control. A time-dependent perforin-granule release was induced by phorbol 12-myristate 13-acetate (PMA) and ionomycin. This release was inhibited dose-dependently by UVA1, but not by UVB. An UVA1-dose dependent pattern of sensitive (80%) and insensitive (20%) individuals was found. The kinetics of perforin release in AD-CTLs, i.e. hyperreleasability, was normalized by 50 J/cm2 UVA1 in vitro. Sodium azide as a quencher of reactive oxygen species prevented the UVA1-mediated inhibition of perforin-granule release. Our data demonstrate for the first time a dose- and wavelength-dependent UVA1-effect in vitro on a major effector system of cytotoxic lymphocytes, the system of perforin-granules. This might contribute to the further understanding of immunomodulatory UVA1-effects in vivo.

Keywords
Cytotoxicity; Regulatory T cells; Skin; Ultraviolet light; Atopic eczema dermatitis syndrome; Phototherapy
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UVA1 radiation (340–400 nm) interferes with the perforin-granule system of CD8hi+ cytotoxic T lymphocytes in vitro
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 82, Issue 3, 1 March 2006, Pages 236–243
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us