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Excimer light is used in the treatment of psoriasis via induction of T cell apoptosis. The objective of this study is to study the effect of excimer light on active versus stable psoriasis and investigate the levels of substance P and its receptor in both groups. The study included 27 stable and 27 active psoriatic patients as well as 10 matched healthy controls. Clinical examination (in the form of local psoriasis severity index (PSI) and visual analogue scale (VAS)) was done to determine disease severity, level of itching, and quality of life. Tissue levels of SP and neurokinin-1 receptor (NK-1R) were measured by ELISA before and after 9 excimer light sessions in 43 patients. A statistically significant lower levels of PSI and VAS were reached after therapy with no significant difference between the stable and active groups. The mean tissue levels of SP before therapy were significantly higher than the control group. Lower levels of SP and NK-1 receptor were found after treatment overall and in each group. Excimer therapy can be effective for both stable and active plaque psoriasis and this effect could be partly through its role on ameliorating the neurogenic inflammation.<\/jats:p>","DOI":"10.1007\/s10103-024-04005-2","type":"journal-article","created":{"date-parts":[[2024,2,1]],"date-time":"2024-02-01T02:22:10Z","timestamp":1706754130000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Excimer light effect on neurogenic inflammation in active versus stable psoriasis lesions"],"prefix":"10.1007","volume":"39","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5740-8256","authenticated-orcid":false,"given":"Marwa S.","family":"El-Mesidy","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yomna A.","family":"Metwally","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zeinab A.","family":"Nour","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Maha F.","family":"Elmasry","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2024,2,1]]},"reference":[{"issue":"7","key":"4005_CR1","doi-asserted-by":"publisher","first-page":"3278","DOI":"10.4049\/jimmunol.1400205","volume":"193","author":"MG Works","year":"2014","unstructured":"Works MG, Yin F, Yin CC, Yiu Y, Shew K, Tran T-T, Dunlap N, Lam J, Mitchell T, Reader J, Stein PL, D\u2019Andrea A (2014) Inhibition of TYK2 and JAK1 ameliorates imiquimod-induced psoriasis-like dermatitis by inhibiting IL-22 and the IL-23\/IL-17 axis. 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