Abstract:
BACKGROUND:Therapeutics targeting tumour necrosis factor (TNF)-α are effective for psoriasis; however, in patients treated for other disorders, psoriasis may worsen and psoriasiform dermatitis (PsoD) may arise. T helper (Th) cytokines in psoriasis upregulate keratin (K)17, which modulates TNF-α transduction, leading to vascular adhesion molecule upregulation and lymphocytic extravasation. AIM:We investigated Th phenotype and expression of K17, intercellular adhesion molecule (ICAM)-1 and vascular adhesion molecule (VCAM)-1 in psoriasis and anti-TNF-α-related PsoD. METHODS:Skin biopsies from patients with psoriasis unresponsive to TNF-α inhibitor therapy (n = 11), PsoD-related to TNF-α inhibition (n = 9), untreated psoriasis (n = 9) or atopic dermatitis (AD; n = 9) were immunohistochemically analysed for Th1, Th2, Th17 and Th22. Expression of K17, ICAM-1 and VCAM-1 was also examined. RESULTS:Anti-TNF-α-unresponsive psoriasis and anti-TNF-α-related PsoD showed decreased Th1 : Th2 raio and increased Th17 : Th1 ratio compared with untreated psoriasis. Anti-TNF-α-unresponsive psoriasis had significantly fewer Th1 (4% vs. 12%) and more Th17 (51% vs. 20%) cells than untreated psoriasis. No difference in Th22 cells was identified. K17 was present in all cases of untreated psoriasis and anti-TNF-α-related PsoD, 91% of anti-TNF-α-unresponsive psoriasis, and only 22% of AD. VCAM-1 and ICAM-1 in anti-TNF-α-related PsoD was akin to untreated psoriasis, but decreased in anti-TNF-α-unresponsive psoriasis. CONCLUSIONS:These findings further the current understanding of the anti-TNF-α-related psoriasiform phenotype and support a rationale for therapeutic targeting of interleukin-17 and TNF-α in combination.
journal_name
Clin Exp Dermatoljournal_title
Clinical and experimental dermatologyauthors
Moy AP,Murali M,Kroshinsky D,Horn TD,Nazarian RMdoi
10.1111/ced.13227subject
Has Abstractpub_date
2018-01-01 00:00:00pages
19-26issue
1eissn
0307-6938issn
1365-2230journal_volume
43pub_type
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