Keratinocyte DDX5 in response to IL-36γ
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA860581 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR20329986_1.fastq.gz | Fastqsanger.gz | |||
| SRR20329986_2.fastq.gz | Fastqsanger.gz | |||
| SRR20329987_1.fastq.gz | Fastqsanger.gz | |||
| SRR20329987_2.fastq.gz | Fastqsanger.gz | |||
| SRR20329988_1.fastq.gz | Fastqsanger.gz |
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Project description:To compare how WT and DDX5-/- keratinocyte in response toIL-36γ, we performed gene expression profiling analysis using data obtained from RNA-seq of WT and DDX5-/- keratinocyte stimulated by IL-36γ
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Project description:The DEAD-box (DDX) proteins function in diverse cellular processes including RNA alternative splicing, and are linked to immune-mediated diseases. However, little is known about the roles of DDXs in skin inflammatory diseases. Here, we show that DDX5, one of the founding members of the DDX RNA helicase family, controls skin inflammation and participates in the pathogenesis of psoriasis via regulating IL-36R pre-mRNA splicing. We found that both mRNA and protein of DDX5 are decreased in lesional skin from patients with psoriasis and psoriasis-like mice, and that mice with keratinocyte-specific ablation of DDX5 spontaneously develop psoriasis-like phenotypes. Mechanistically, DDX5 complexes with serine/arginine-rich splicing factor 1(SRSF1) to typically regulate IL-36R pre-mRNA splicing in keratinocytes, which generates mRNAs encoding full-length IL-36R and a previously unknown soluble form of IL-36R (sIL-36R). sIL-36R controls IL-36/IL-36R signaling by competing with IL-36R for IL-36γ ligation. The reduction or deficiency of DDX5 leads to IL-36R pre-mRNA splicing preferring to the generation of IL-36R but not sIL-36R, thereby selectively amplifying inflammatory responses of keratinocytes to IL-36γ and then aggravating cutaneous inflammation in psoriasis. Genetic restoration or intradermal administration of sIL-36R in psoriasis-like mice suppresses IL-36R signaling and alleviates the disease phenotype of psoriasis. Altogether, these data reveal a pathogenic role of DDX5 during psoriasis, and provide mechanistic insights into the regulation of IL-36R splicing and its impact on psoriasis development.
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Project description:The aim of this study was to establish an intradermal ear injection model to evaluate the effects of IL-36γ and IL-17A in psoriasis.The cytokines IL-36γ and IL-17A were injected intradermally alone or in combination into the ear pinnae of C57BL/6 mice. Ear thickness measurement was performed daily. After 4 days mice were euthanized and a gene expression profiling was conducted.
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Project description:Loss-of-function mutations in the IL36RN gene encoding IL-36 receptor antagonist (IL-36RA) cause familial generalized pustular psoriasis (GPP), which sometimes begins shortly after birth and is difficult to treat, and its effects on the epidermis are unclear. This study aimed to investigate the involvement of IL-36 receptor agonists in the epidermal formation of GPP. In this study, we found that IL-36 receptor agonists, especially mature IL-36γ, stimulate IL-8 and proIL-36γ production in the epidermis, while down-regulating the genes encoding epidermal cornified envelope-related proteins such as corneodesmosin. IL-36 receptor antagonists and monoclonal anti-IL-36γ antibodies counteract the effect of mature IL-36γ on corneodesmosin in keratinocytes in a dose-dependent manner. In the epidermis of generalized pustular psoriasis patients with IL36RN loss-of-function mutations, proIL-36γ is overproduced in the epidermis and corneodesmosin protein expression is markedly decreased in the region of giant subcorneal pustules called Kogoj’s spongiform pustules with high neutrophil infiltration. IL-8 induced by mature IL-36γ induces several neutrophils in the epidermis, and the newly produced proIL-36γ is cleaved to the mature form by neutrophil proteases. This newly produced mature IL-36γ was predicted to further suppress the gene expression of the granulosa-stratum-associated protein, corneodesmosin, leading to significant stratum corneum exfoliation and formation of giant subcorneal pustules. Overall, our results elucidate the mechanism underlying the formation of Kogoj’s spongiform pustules in generalized pustular psoriasis.
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