The intracellular 52-kd Ro/SSA autoantigen in keratinocytes is up-regulated by tumor necrosis factor ? via tumor necrosis factor receptor I
| Autor: | Velia Gerl, Andreas Radbruch, Markus Gerl, F Schumann, Rolf Klein, Christa Johnen, Aderajew Waka, Falk Hiepe, Björn Hostmann |
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| Rok vydání: | 2005 |
| Předmět: |
Keratinocytes
medicine.medical_specialty Immunology Gene Expression Apoptosis Biology Autoantigens Polymerase Chain Reaction Receptors Tumor Necrosis Factor stomatognathic system Rheumatology Downregulation and upregulation Internal medicine Lupus Erythematosus Cutaneous medicine Humans Immunology and Allergy Pharmacology (medical) RNA Messenger Receptor Cells Cultured Messenger RNA Tumor Necrosis Factor-alpha Molecular biology Up-Regulation stomatognathic diseases medicine.anatomical_structure Endocrinology Ribonucleoproteins Tumor necrosis factor alpha Signal transduction Keratinocyte Intracellular Signal Transduction |
| Zdroj: | Arthritis & Rheumatism. 52:531-538 |
| ISSN: | 1529-0131 0004-3591 |
| DOI: | 10.1002/art.20851 |
| Popis: | Objective Previous studies have shown that the nuclear Ro/SSA autoantigens involved in photosensitive cutaneous lupus manifestations are regulated by ultraviolet B (UVB) irradiation. UVB exposure triggers the release of tumor necrosis factor α (TNFα) from keratinocytes in the epidermis and from mast cells in the dermis. The present study aimed to characterize the effect of TNFα on messenger RNA (mRNA) and protein expression of the intracellular 52-kd Ro/SSA autoantigen in primary human keratinocytes and to elucidate the TNFα receptor (TNFR) signaling pathways mediating this effect. Methods Expression of 52-kd Ro/SSA mRNA in primary human keratinocytes was investigated by quantitative real-time polymerase chain reaction (LightCycler system) using GAPDH as the housekeeping gene. Expression of 52-kd Ro/SSA protein was studied by flow cytometry after staining intracellular protein with IgG purified from an anti–52-kd Ro/SSA–positive serum. TNFR function was assessed by culturing cells in the presence and absence of neutralizing antibodies directed against the TNFR subunits TNFRI and TNFRII. Results TNFα-induced up-regulation of 52-kd Ro/SSA mRNA expression peaked at 4 hours, followed by up-regulation of intracellular 52-kd Ro/SSA protein expression at 24 hours, independently of apoptosis. Between different donors, a high variability of both constitutive expression levels and TNFα-induced changes in 52-kd Ro/SSA mRNA and protein expression was observed. The up-regulatory effect of TNFα on 52-kd Ro/SSA mRNA and protein expression was inhibited by anti-TNFRI antibodies but enhanced by anti-TNFRII antibodies. Conclusion The finding that TNFα up-regulates 52-kd Ro/SSA expression in keratinocytes via TNFRI suggests that it may play a role in the pathogenesis of anti-Ro/SSA–associated cutaneous lupus erythematosus. |
| Databáze: | OpenAIRE |
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