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Zhang J, Wu J, Sun M, Zhang S, Huang J, Man M, Hu L. Phospholipase C epsilon mediates cytokine cascade induced by acute disruption of epidermal permeability barrier in mice. Biochem Biophys Rep 2020; 24:100869. [PMID: 33336085 PMCID: PMC7733008 DOI: 10.1016/j.bbrep.2020.100869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 11/23/2020] [Indexed: 11/24/2022] Open
Abstract
Disruption of epidermal barrier is an important trigger in abnormal cutaneous inflammation. Phospholipase C epsilon (PLCε), a Ras/Rap1 effector, is essential for regulating cytokines production in different types of skin inflammation. Our previous studies have demonstrated that elevated expression of PLCε participates in the psoriasis-like inflammation in PLCε overexpressing transgenic mice model, while the reduction in PLCε expression attenuates inflammatory responses in either TPA- or DNFB-induced cutaneous inflammation. Here, we determined the role of PLCε in cutaneous inflammation induced by acute abrogation of epidermal permeability barrier. In comparison to wild type controls, PLCε KO mice exhibited reduced ear swelling and infiltration of granulocytes after tape-stripping. Moreover, expression levels of pro-inflammatory cytokines (IL-1α, IL-1β), chemokines (CXCL-1, CXCL-2, CCL20), and antimicrobial peptides (S100 proteins, MBD3) were lower in PLCε-deficient versus wild type mice. Likewise, expression levels of cytokines and chemokines were also lower in PLCε deficient keratinocytes and fibroblasts following IL-22 stimulation in vitro. Furthermore, knockdown of PLCε with its siRNA decreased expression of IL-1α, CCL20, and S100 proteins, and MBD3 in HEK cultures. Collectively, these results suggested that PLCε mediated cytokine cascade induced by acute barrier disruption. IL-22 is likely the upstream of PLCε-mediated cytokine cascade following acute barrier disruption. PLCε deficiency reduces inflammation cascade after barrier disruption. IL-22 serves as a possible upstream activator of PLCε in keratinocytes. IL-22/PLCε signaling potentially involves in barrier related diseases like psoriasis.
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Key Words
- BMP4, bone morphogenetic protein 4
- Barrier function
- CCL20, chemokine (C–C motif) ligand 20
- CXCL, chemokine (C-X-C motif) ligand
- FLG, filaggrin
- HEK, human epidermal keratinocytes
- IL-22
- IVL, involucrin
- K1, keratin 1
- K15, keratin 15
- LHX2, LIM homeobox 2
- LOR, loricrin
- MBD, murine beta defensin
- PLCε
- PLCε, phospholipase C epsilon
- PMA, Phorbol-12-myristate-13-acetate
- Psoriasis
- SHH, sonic hedgehog
- SOX9, SRY-box 9
- SPT1, serine palmitoyltransferase 1
- STAT3, transducer and activator of transcription 3
- Skin inflammation
- TGF, transforming growth factor
- TLR2, toll like receptor 2
- TNF, tumor necrosis factor
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Affiliation(s)
- Jing Zhang
- Immunology Department, Key Laboratory of Immune Microenvironment and Disease (Ministry of Education), Tianjin Medical University, Tianjin, 300070, China.,Department of Pathogen Biology and Immunology, Basic Medical College, Tianjin Medical University, Tianjin, 300070, China
| | - Jiangmei Wu
- Department of Pathogen Biology and Immunology, Basic Medical College, Tianjin Medical University, Tianjin, 300070, China
| | - Mengke Sun
- Department of Pathogen Biology and Immunology, Basic Medical College, Tianjin Medical University, Tianjin, 300070, China
| | - Shuchang Zhang
- Department of Pathogen Biology and Immunology, Basic Medical College, Tianjin Medical University, Tianjin, 300070, China
| | - Junkai Huang
- Department of Pathogen Biology and Immunology, Basic Medical College, Tianjin Medical University, Tianjin, 300070, China
| | - Maoqiang Man
- Dermatology Services, University of California San Francisco, San Francisco, CA, 94121, USA
| | - Lizhi Hu
- Immunology Department, Key Laboratory of Immune Microenvironment and Disease (Ministry of Education), Tianjin Medical University, Tianjin, 300070, China.,Department of Pathogen Biology and Immunology, Basic Medical College, Tianjin Medical University, Tianjin, 300070, China
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