Details

Autor(en) / Beteiligte

• Rebane, Ana, PhD
• Zimmermann, Maya, PhD
• Aab, Alar, MSc
• Baurecht, Hansjörg, MSc
• Koreck, Andrea, MD
• Karelson, Maire, MD
• Abram, Kristi, MD
• Metsalu, Tauno, MSc
• Pihlap, Maire, BSc
• Meyer, Norbert, MD
• Fölster-Holst, Regina, MD
• Nagy, Nikoletta, MD, PhD
• Kemeny, Lajos, MD
• Kingo, Külli, MD, PhD
• Vilo, Jaak, PhD
• Illig, Thomas, MD
• Akdis, Mübeccel, MD, PhD
• Franke, Andre, PhD
• Novak, Natalija, MD
• Weidinger, Stephan, MD
• Akdis, Cezmi A., MD

Titel

Mechanisms of IFN-γ–induced apoptosis of human skin keratinocytes in patients with atopic dermatitis

Ist Teil von

• Journal of allergy and clinical immunology, 2012-05, Vol.129 (5), p.1297-1306

Ort / Verlag

New York, NY: Mosby, Inc

Erscheinungsjahr

2012

Quelle

MEDLINE

Beschreibungen/Notizen

• Background Enhanced apoptosis of keratinocytes is the main cause of eczema and spongiosis in patients with the common inflammatory skin disease atopic dermatitis (AD). Objective The aim of the study was to investigate molecular mechanisms of AD-related apoptosis of keratinocytes. Methods Primary keratinocytes isolated from patients with AD and healthy donors were used to study apoptosis by using annexin V/7-aminoactinomycin D staining. Illumina mRNA Expression BeadChips, quantitative RT-PCR, and immunofluorescence were used to study gene expression. In silico analysis of candidate genes was performed on genome-wide single nucleotide polymorphism data. Results We demonstrate that keratinocytes of patients with AD exhibit increased IFN-γ–induced apoptosis compared with keratinocytes from healthy subjects. Further mRNA expression analyses revealed differential expression of apoptosis-related genes in AD keratinocytes and skin and the upregulation of immune system–related genes in skin biopsy specimens of chronic AD lesions. Three apoptosis-related genes ( NOD2 , DUSP1 , and ADM ) and 8 genes overexpressed in AD skin lesions ( CCDC109B , CCL5 , CCL8 , IFI35 , LYN , RAB31 , IFITM1 , and IFITM2 ) were induced by IFN-γ in primary keratinocytes. The protein expression of IFITM1, CCL5, and CCL8 was verified in AD skin. In line with the functional studies and AD-related mRNA expression changes, in silico analysis of genome-wide single nucleotide polymorphism data revealed evidence of an association between AD and genetic markers close to or within the IFITM cluster or RAB31 , DUSP1 , and ADM genes. Conclusion Our results demonstrate increased IFN-γ responses in skin of patients with AD and suggest involvement of multiple new apoptosis- and inflammation-related factors in the development of AD.