Abstract
TNF-related apoptosis-inducing ligand (TRAIL) is recognized as an important regulator of immune responses during infections and various autoimmune-mediated pathologies. Its role in inflammatory dermatoses is largely unknown. We aimed to investigate the expression of TRAIL and its receptors DR4 and DR5 in psoriasis vulgaris. Immunohistochemistry for TRAIL, DR4 and DR5 was performed on samples of lesional (n = 10) and non-lesional (n = 10) skin of patients with plaque psoriasis and skin of healthy volunteers (n = 10). Expression of TRAIL and its receptors was further examined by means of double immunofluorescence staining and co-localization with CD4, CD8, CD11c, CD68, CD16 and CD56 markers. Immunohistochemical staining for TRAIL was significantly enhanced in psoriatic lesional as well as non-lesional epidermis compared to the epidermis of healthy skin. Lesional epidermis also showed increased immunoreactivity for DR5. In addition, expression of TRAIL and both of its receptors was significantly increased in the dermis of lesional skin. As evidenced by double immunofluorescence, TRAIL was readily expressed by most of the examined cells of the inflammatory infiltrate in psoriatic lesions. In contrast, the expression of DR4 was found mostly among CD4+ and CD8+ cells but was only nuclear, while DR5 showed cytoplasmic staining in rare CD16+, CD56+ and CD68+ cells. According to abundant in situ presence of TRAIL and its receptors in lesional psoriatic skin, it seems that this cytokine participates in the complex interplay between keratinocytes and cells of the dermal infiltrate and thus contributes to the inflammatory cycle in psoriasis vulgaris.
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The study was supported by Grants 062-0620239-0197 and 062-0620239-0199 of the Ministry of Science, Education and Sports of the Republic of Croatia.
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Peternel, S., Prpić-Massari, L., Manestar-Blažić, T. et al. Increased expression of TRAIL and its death receptors DR4 and DR5 in plaque psoriasis. Arch Dermatol Res 303, 389–397 (2011). https://doi.org/10.1007/s00403-011-1125-0
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DOI: https://doi.org/10.1007/s00403-011-1125-0