Abstract
Langerhans cell histiocytosis (LCH) is a lymphoproliferative disorder consisting of abnormal Langerhans cell-like cells and other lymphoid cells. LCH presents as either a multisystem LCH (LCH-MS) or a single-system LCH (LCH-SS). Currently, neither the pathogeneses nor the factors that define these disease subclasses have been elucidated. The interleukin (IL)-17A autocrine LCH model and IL-17A-targeted therapies have been proposed and have engendered much controversy. Those authors showed high serum IL-17A levels in LCH and argued that serum IL-17A-dependent fusion activities in vitro, rather than serum IL-17A levels, correlated with LCH severity (i.e. the IL-17A paradox). In contrast, others could not confirm the IL-17A autocrine model. So began the controversy on IL-17A, which still continues. We approached the IL-17A controversy and the IL-17A paradox from a new perspective in considering the expression levels of IL-17A receptor (IL-17RA). We detected higher levels of IL-17RA protein expression in LCH-MS (n = 10) as compared to LCH-SS (n = 9) (P = 0.041) by immunofluorescence. We reconfirmed these data by re-analyzing GSE16395 mRNA data. We found that serum levels of IL-17A were higher in LCH (n = 38) as compared to controls (n = 20) (P = 0.005) with no significant difference between LCH subclasses. We propose an IL-17A endocrine model and stress that changes in IL-17RA expression levels are important for defining LCH subclasses. We hypothesize that these IL-17RA data could clarify the IL-17A controversy and the IL-17A paradox. As a potential treatment of LCH-MS, we indicate the possibility of an IL-17RA-targeted therapy.
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Abbreviations
- AU:
-
Arbitrary units
- BH-FDR:
-
False discovery rate controlled by the Benjamini–Hochberg procedure
- ELISA:
-
Enzyme-linked immunosorbent assay
- FFPE:
-
Formalin-fixed paraffin-embedded
- IL-17A:
-
Interleukin-17A
- IL-17RA:
-
Interleukin-17A receptor
- IS:
-
Intensity score
- LC:
-
Langerhans cell
- LCH:
-
Langerhans cell histiocytosis
- LCH cell:
-
Langerhans cell-like abnormal cell
- LCH-MS:
-
Multisystem LCH
- LCH-SS:
-
Single-system LCH
- LC/MRM-MS:
-
Liquid chromatography/multiple reaction monitoring-mass spectrometry
- LC/MS:
-
Liquid chromatography/mass spectrometry
- MMP:
-
Matrix metalloproteinase
- S100:
-
S100 protein
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Acknowledgments
This work was partly supported by the Histiocytosis Association of America (HAA grant 2009); a Grant-in-aid for Scientific Research (C) 23590426 from the Japanese Ministry of Education, Science, Sports and Culture; Grant for Research on Measures for Intractable Diseases from the Ministry of Health, Labor and Welfare of Japan; and a 2011 research grant from the Japan LCH Study Group. We thank Dr. Katsumi Higaki and Dr. Katsumi Nagata (Research Center for Bioscience and Technology, Tottori University) for their help with confocal microscopy and LC/MRM-MS.
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The authors declare that they have no conflict of interest.
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Murakami, I., Morimoto, A., Oka, T. et al. IL-17A receptor expression differs between subclasses of Langerhans cell histiocytosis, which might settle the IL-17A controversy. Virchows Arch 462, 219–228 (2013). https://doi.org/10.1007/s00428-012-1360-6
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DOI: https://doi.org/10.1007/s00428-012-1360-6
Keywords
- Langerhans cell histiocytosis
- Interleukin-17A
- Interleukin-17A receptor
- Photoshop-assisted image analysis
- Staining intensity
- Immunofluorescence