IL-36 Receptor Antagonist Deficiency Linked to Reduced Skin Chemokine and Heightened Psoriatic Inflammation
Researchers using mouse models and human patient data have found that deficiency of the IL-36 receptor antagonist (DITRA) disrupts skin immune homeostasis by reducing expression of the chemokine CCL27, even before disease onset. This disruption is accompanied by skin microbiome dysbiosis, including overgrowth of Cutibacterium acnes, and precedes the severe pustular psoriasis flares characteristic of DITRA. The findings suggest CCL27 may be a therapeutic target for reducing disease severity in DITRA patients.
Deficiency of the IL-36 receptor antagonist (DITRA), caused by loss-of-function mutations in the IL36RN gene, leads to unopposed IL-36 cytokine signalling and severe, recurrent episodes of Generalized Pustular Psoriasis (GPP). Using IL-36Ra-deficient mice (Il36rn-/-), researchers found that even in overtly healthy animals prior to disease onset, dermal immune homeostasis is disrupted, marked by significantly reduced expression of the chemokine CCL27. This homeostatic disruption was associated with dysbiosis of the skin microbiome, particularly an outgrowth of the commensal bacterium Cutibacterium acnes. Critically, intradermal administration of recombinant CCL27 before disease induction substantially reduced the severity of psoriasiform inflammation in the mouse model, establishing a functional role for this chemokine in modulating disease predisposition. Transcriptomic analysis of skin from GPP patients corroborated these findings, showing decreased CCL27 expression in both lesional and non-lesional skin compared to healthy controls. These results identify a novel pre-disease mechanism by which IL-36Ra deficiency alters skin homeostasis and increases susceptibility to severe psoriatic inflammation, potentially opening new avenues for early intervention in DITRA patients.
What's missing
The study relies on a mouse model (Il36rn-/-) that recapitulates GPP inflammation, but the degree to which murine skin immunology and microbiome composition translate to human disease remains uncertain. The human transcriptomic analysis is correlational and does not establish causality between CCL27 reduction and GPP onset in patients. The sample size of GPP patients used for transcriptomic validation is not reported in the abstract, limiting assessment of statistical power. It is also unclear whether CCL27 administration could be practically translated into a clinical intervention, or whether restoring CCL27 levels would be sufficient to prevent flares in the context of ongoing IL-36 signalling dysregulation.
What different sources said
- bioRxivCenter
Deficiency of IL-36 receptor antagonist (DITRA) is associated with decreased homoeostatic CCL27 expression leading to heightened dermal inflammation.
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