eISSN: 2299-0046
ISSN: 1642-395X
Advances in Dermatology and Allergology/Postępy Dermatologii i Alergologii
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abstract:
Original paper

Increased expression of psoriasin (S100A7) and interleukin 17 (IL-17) in lesional skin in lichen planopilaris

Agnieszka Otlewska-Szpotowicz
1
,
Wojciech Baran
1
,
Zdzisław Woźniak
2
,
Jacek Szepietowski
1
,
Aleksandra Batycka-Baran
1

  1. Department of Dermatology, Venereology and Allergology, Wroclaw Medical University, Wroclaw, Poland
  2. Department of Clinical and Experimental Pathology, Wroclaw Medical University, Wroclaw, Poland
Adv Dermatol Allergol
DOI: https://doi.org/10.5114/ada.2024.142179
Online publish date: 2024/08/12
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Introduction:
Lichen planopilaris (LPP) is an inflammatory, primary scarring alopecia, however its pathogenesis is not completely elucidated. S100A7 is a multifunctional, antimicrobial protein with proinflammatory properties. Interleukin-17 (IL-17) is implicated in the development of various autoimmune skin diseases.

Aim:
To determine the tissue expression of S100A7, S100A4 and IL-17 in LPP.

Material and methods:
The immunohistochemical analysis was performed on biopsy specimens obtained from individuals with histologically confirmed lichen planopilaris (n = 23), alopecia areata (AA) (n = 11), and healthy controls (n = 14). The expression was evaluated using Zeiss Axio Imager A2 light microscope.

Results:
The number of cells showing S100A7 expression was significantly higher in LPP lesional skin compared to AA lesional skin (p = 0.0002) and normal skin of healthy controls (p < 0.0001). The number of cells showing IL-17 expression was significantly higher in LPP lesional skin compared to normal skin of healthy controls (p < 0.0001) and the number of cells showing IL-17 expression was significantly higher in AA lesional skin compared to normal skin of healthy controls (p < 0.0001). The number of cells showing IL-17 expression was not significantly different in LPP lesional skin and in AA lesional skin (p > 0.05). The number of cells showing S100A4 expression was not significantly different in LPP lesional skin, AA lesional skin and in normal skin of healthy controls.

Conclusions:
The results of our study suggest the possible role of S100A7 and IL-17 in the pathogenesis of LPP.

keywords:

lichen planopilaris, interleukin-17, S100A7
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