PMID- 34360845 OWN - NLM STAT- MEDLINE DCOM- 20210908 LR - 20210908 IS - 1422-0067 (Electronic) IS - 1422-0067 (Linking) VI - 22 IP - 15 DP - 2021 Jul 28 TI - Mast Cell Cytokines IL-1, IL-33, and IL-36 Mediate Skin Inflammation in Psoriasis: A Novel Therapeutic Approach with the Anti-Inflammatory Cytokines IL-37, IL-38, and IL-1Ra. LID - 10.3390/ijms22158076 [doi] LID - 8076 AB - Psoriasis (PS) is a skin disease with autoimmune features mediated by immune cells, which typically presents inflammatory erythematous plaques, and is associated with many comorbidities. PS exhibits excessive keratinocyte proliferation, and a high number of immune cells, including macrophages, neutrophils, Th1 and Th17 lymphocytes, and mast cells (MCs). MCs are of hematopoietic origin, derived from bone marrow cells, which migrate, mature, and reside in vascularized tissues. They can be activated by antigen-provoking overexpression of proinflammatory cytokines, and release a number of mediators including interleukin (IL)-1 and IL-33. IL-1, released by activated keratinocytes and MCs, stimulates skin macrophages to release IL-36-a powerful proinflammatory IL-1 family member. IL-36 mediates both innate and adaptive immunity, including chronic proinflammatory diseases such as psoriasis. Suppression of IL-36 could result in a dramatic improvement in the treatment of psoriasis. IL-36 is inhibited by IL-36Ra, which binds to IL-36 receptor ligands, but suppression can also occur by binding IL-38 to the IL-36 receptor (IL-36R). IL-38 specifically binds only to IL-36R, and inhibits human mononuclear cells stimulated with IL-36 in vitro, sharing the effect with IL-36Ra. Here, we report that inflammation in psoriasis is mediated by IL-1 generated by MCs-a process that activates macrophages to secrete proinflammatory IL-36 inhibited by IL-38. IL-37 belongs to the IL-1 family, and broadly suppresses innate inflammation via IL-1 inhibition. IL-37, in murine models of inflammatory arthritis, causes the suppression of joint inflammation through the inhibition of IL-1. Therefore, it is pertinent to think that IL-37 can play an inhibitory role in inflammatory psoriasis. In this article, we confirm that IL-38 and IL-37 cytokines emerge as inhibitors of inflammation in psoriasis, and hold promise as an innovative therapeutic tool. FAU - Conti, Pio AU - Conti P AUID- ORCID: 0000-0002-9475-4924 AD - Postgraduate Medical School, University of Chieti, 66100 Chieti, Italy. FAU - Pregliasco, Fabrizio E AU - Pregliasco FE AUID- ORCID: 0000-0002-3919-0679 AD - Istituto Ortopedico Galeazzi, 20100 Milano, Italy. FAU - Bellomo, Rosa G AU - Bellomo RG AD - Facolta di Scienze dell'Educazione Motoria, Universita "Carlo Bo", 61029 Urbino, Italy. FAU - Gallenga, Carla E AU - Gallenga CE AUID- ORCID: 0000-0002-7426-8603 AD - Department of Biomedical Sciences and Specialist Surgery, University of Ferrara, 44100 Ferrara, Italy. FAU - Caraffa, Alessandro AU - Caraffa A AD - School of Pharmacy, University of Camerino, 62032 Camerino, Italy. FAU - Kritas, Spyros K AU - Kritas SK AD - Department of Microbiology and Infectious Diseases, Aristotle University of Thessaloniki, 54250 Macedonia, Greece. FAU - Lauritano, Dorina AU - Lauritano D AUID- ORCID: 0000-0002-3550-1812 AD - Medicine and Surgery Centre of Neuroscience of Milan, University of Milan-Bicocca, 20100 Milano, Italy. FAU - Ronconi, Gianpaolo AU - Ronconi G AD - Clinica dei Pazienti del Territorio, Fondazione Policlinico Gemelli, 00168 Rome, Italy. LA - eng PT - Journal Article PT - Review DEP - 20210728 PL - Switzerland TA - Int J Mol Sci JT - International journal of molecular sciences JID - 101092791 RN - 0 (IL-38 protein, human) RN - 0 (IL37 protein, human) RN - 0 (Interleukin 1 Receptor Antagonist Protein) RN - 0 (Interleukin-1) RN - 0 (Interleukin-33) RN - 0 (Interleukins) SB - IM MH - Animals MH - Humans MH - Inflammation MH - Interleukin 1 Receptor Antagonist Protein/therapeutic use MH - Interleukin-1/*immunology/therapeutic use MH - Interleukin-33/immunology MH - Interleukins/immunology/*therapeutic use MH - Mast Cells/immunology/metabolism MH - Psoriasis/drug therapy/*immunology MH - Skin PMC - PMC8348737 OTO - NOTNLM OT - IL-1 OT - IL-1Ra OT - IL-37 OT - IL-38 OT - cytokine OT - immunology OT - inflammation OT - mast cell OT - psoriasis COIS- All the authors report no conflicts of interest relevant to this article. EDAT- 2021/08/08 06:00 MHDA- 2021/09/09 06:00 PMCR- 2021/07/28 CRDT- 2021/08/07 01:08 PHST- 2021/06/24 00:00 [received] PHST- 2021/07/22 00:00 [revised] PHST- 2021/07/25 00:00 [accepted] PHST- 2021/08/07 01:08 [entrez] PHST- 2021/08/08 06:00 [pubmed] PHST- 2021/09/09 06:00 [medline] PHST- 2021/07/28 00:00 [pmc-release] AID - ijms22158076 [pii] AID - ijms-22-08076 [pii] AID - 10.3390/ijms22158076 [doi] PST - epublish SO - Int J Mol Sci. 2021 Jul 28;22(15):8076. doi: 10.3390/ijms22158076.