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Rorγt+ innate lymphocytes and γδ T cells initiate psoriasiform plaque formation in mice
Stanislav Pantelyushin, … , Alexander A. Navarini, Burkhard Becher
Stanislav Pantelyushin, … , Alexander A. Navarini, Burkhard Becher
Published May 1, 2012
Citation Information: J Clin Invest. 2012;122(6):2252-2256. https://doi.org/10.1172/JCI61862.
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Brief Report Dermatology

Rorγt+ innate lymphocytes and γδ T cells initiate psoriasiform plaque formation in mice

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Abstract

Psoriasis is a common, relapsing inflammatory skin disease characterized by erythematous scaly plaques. Histological manifestations of psoriasis include keratinocyte dysregulation and hyperproliferation, elongated rete ridges, and inflammatory infiltrates consisting of T cells, macrophages, dendritic cells, and neutrophils. Despite the availability of new effective drugs to treat psoriasis, the underlying mechanisms of pathogenesis are still poorly understood. Recent studies have shown that Aldara cream, used to treat benign skin abnormalities, triggers psoriasis-like disease in humans and mice and have implicated Th17 cells in disease initiation. Using this as a model, we found a predominant role for the Th17 signature cytokines IL-17A, IL-17F, and IL-22 in psoriasiform plaque formation in mice. Using gene-targeted mice, we observed that loss of Il17a, Il17f, or Il22 strongly reduced disease the severity of psoriasis. However, we found that Th17 cells were not the primary source of these pathogenic cytokines. Rather, IL-17A, IL-17F, and IL-22 were produced by a skin-invading population of γδ T cells and RORγt+ innate lymphocytes. Furthermore, our findings establish that RORγt+ innate lymphocytes and γδ T cells are necessary and sufficient for psoriatic plaque formation in an experimental disease model that closely resembles human psoriatic plaque formation.

Authors

Stanislav Pantelyushin, Stefan Haak, Barbara Ingold, Paulina Kulig, Frank L. Heppner, Alexander A. Navarini, Burkhard Becher

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