Volume 49, Issue 2 pp. 123-132
ORIGINAL ARTICLE

Interleukin 36 expression in psoriasis variants and other dermatologic diseases with psoriasis-like histopathologic features

Terese Monette Aquino

Terese Monette Aquino

University of California San Francisco, San Francisco, California, USA

Search for more papers by this author
Mary Grace Calvarido

Mary Grace Calvarido

University of California San Francisco, San Francisco, California, USA

Search for more papers by this author
Jeffrey P. North

Corresponding Author

Jeffrey P. North

Correspondence

Jeffrey P. North, MD, University of California San Francisco, 1701 Divisadero Street #280, San Francisco, CA 94115.

Email: [email protected]

Search for more papers by this author
First published: 04 August 2021
Citations: 3

Terese Monette Aquino and Mary Grace Calvarido contributed equally to this study.

Abstract

Background

Elevated epidermal interleukin (IL)-36 expression distinguishes psoriasis from eczematous dermatitis, but other psoriasiform dermatitides (PDs) have not been thoroughly investigated for IL-36 expression. In this study, we assess the IL-36 staining pattern (IL36-SP) in psoriasis variants and other PDs including lichen simplex chronicus (LSC), prurigo nodularis (PN), lichen planus (LP), tinea, pityriasis rubra pilaris (PRP), mycosis fungoides (MF), pemphigus foliaceus (PF), acute generalized exanthematous pustulosis (AGEP), impetigo (IMP), and syphilis (SY).

Methods

IL-36 immunostaining was performed on 307 cases of psoriasis and various PDs. IL36-SP in the upper epidermis was graded on a scale of 0-4.

Results

High IL36-SP occurred in all variants of psoriasis, as well as in AGEP, PRP, PN, tinea, IMP, and LP (P > 0.05). SY, PF, LSC, and MF showed a lower IL36-SP (P ≤ 0.05) compared with psoriasis.

Conclusion

All variants of psoriasis exhibit high IL36-SP. IL-36 staining can assist in differentiating MF, PF, SY, and LSC from psoriasis, particularly MF and LSC, which have consistent low IL-36 expression. AGEP, PRP, tinea, IMP, PN, and LP exhibit high IL-36 expression similar to psoriasis, indicating Th17 activation in these diseases.

CONFLICT OF INTEREST

The authors declared no potential conflicts of interest.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available from the corresponding author upon reasonable request.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.