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High-throughput Quantitative Real-time RT-PCR Assay for Determining Expression Profiles of Types I and III Interferon Subtypes
Published on: March 24, 2015
Type I interferon-associated cytotoxic inflammation in lichen planus
Joerg Wenzel1, Marina Scheler, Julia Proelss
1Department of Dermatology, University of Bonn, Bonn, Germany. joerg.wenzel@ukb.uni-bonn.de
Journal of Cutaneous Pathology
|October 10, 2006
Summary
Type I interferons (IFNs) are involved in lichen planus (LP) pathogenesis. Plasmacytoid dendritic cells produce type I IFNs, recruiting cytotoxic lymphocytes via IP10/CXCR3 interactions, driving chronic skin inflammation.
Area of Science:
- Immunodermatology
- Autoimmune skin diseases
- Cytokine signaling
Background:
- Lichen planus (LP) is an autoimmune skin disease characterized by keratinocyte destruction.
- Autoreactive cytotoxic CD8(+) T lymphocytes are implicated in LP pathogenesis.
- Type I interferons (IFNs) may play a role in cytotoxic skin inflammation.
Purpose of the Study:
- To investigate the involvement of type I IFNs in the pathogenesis of lichen planus.
- To explore the source and function of type I IFNs in LP lesions.
Main Methods:
- Immunohistochemical analysis of skin biopsies from LP patients and healthy controls.
- Detection of immune cell markers (CD3, CD4, CD8, CD20, CD68), chemokine receptors (CXCR3), cytotoxic markers (granzyme B), IFN-induced proteins (IP10/CXCL10, MxA), and plasmacytoid dendritic cell markers (CD123).
Main Results:
- Significant expression of MxA protein, an indicator of type I IFN activity, was found in all LP skin biopsies.
- MxA expression correlated with the recruitment of CXCR3(+) and granzyme B(+) lymphocytes, suggesting a Th1-biased cytotoxic immune response.
- IP10/CXCL10, a ligand for CXCR3, was highly expressed, linking type I IFN activity to lymphocyte recruitment. Plasmacytoid dendritic cells (pDCs) were identified as a major source of type I IFNs.
Conclusions:
- Lesional type I IFNs, primarily produced by pDCs, are crucial in the chronic cytotoxic inflammation of LP.
- Type I IFNs contribute to LP pathogenesis by recruiting cytotoxic effector lymphocytes through IP10/CXCR3 interactions.
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