TLR8 aggravates skin inflammation and fibrosis by activating skin fibroblasts in systemic sclerosis

Abstract Objectives Innate immunity significantly contributes to SSc pathogenesis. TLR8 is an important innate immune mediator that is implicated in autoimmunity and fibrosis. However, the expression, mechanism of action, and pathogenic role of TLR8 in SSc remain unclear. The aim of this study was t...

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Veröffentlicht in:Rheumatology (Oxford, England) England), 2024-05, Vol.63 (6), p.1710-1719
Hauptverfasser: Kong, Xiangzhen, Jiang, Shuai, He, Qiuyu, Shi, Xiangguang, Pu, Weilin, Huang, Yan, Ma, Yanyun, Liu, Qingmei, Sun, Dayan, Huang, Delin, Wu, Fei, Li, Pengcheng, Tu, Wenzhen, Zhao, Yinhuan, Wang, Lei, Chen, Yuanyuan, Wu, Wenyu, Tang, Yulong, Zhao, Xiansheng, Zhu, Qing, Gao, Jian, Xu, Weihong, Shui, Xiaochuan, Qian, Feng, Wang, Jiucun
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container_end_page 1719
container_issue 6
container_start_page 1710
container_title Rheumatology (Oxford, England)
container_volume 63
creator Kong, Xiangzhen
Jiang, Shuai
He, Qiuyu
Shi, Xiangguang
Pu, Weilin
Huang, Yan
Ma, Yanyun
Liu, Qingmei
Sun, Dayan
Huang, Delin
Wu, Fei
Li, Pengcheng
Tu, Wenzhen
Zhao, Yinhuan
Wang, Lei
Chen, Yuanyuan
Wu, Wenyu
Tang, Yulong
Zhao, Xiansheng
Zhu, Qing
Gao, Jian
Xu, Weihong
Shui, Xiaochuan
Qian, Feng
Wang, Jiucun
description Abstract Objectives Innate immunity significantly contributes to SSc pathogenesis. TLR8 is an important innate immune mediator that is implicated in autoimmunity and fibrosis. However, the expression, mechanism of action, and pathogenic role of TLR8 in SSc remain unclear. The aim of this study was to explore the roles and underlying mechanisms of TLR8 in SSc. Methods The expression of TLR8 was analysed, based on a public dataset, and then verified in skin tissues and skin fibroblasts of SSc patients. The role of TLR8 in inflammation and fibrosis was investigated using a TLR8-overexpression vector, activator (VTX-2337), inhibitor (cu-cpt-8m), and TLR8 siRNA in skin fibroblasts. The pathogenic role of TLR8 in skin inflammation and fibrosis was further validated in a bleomycin (BLM)-induced mouse skin inflammation and fibrosis model. Results TLR8 levels were significantly elevated in SSc skin tissues and myofibroblasts, along with significant activation of the TLR8 pathway. In vitro studies showed that overexpression or activation of TLR8 by a recombinant plasmid or VTX-2337 upregulated IL-6, IL-1β, COL I, COL III and α-SMA in skin fibroblasts. Consistently, both TLR8-siRNA and cu-cpt-8m reversed the phenotypes observed in TLR8-activating fibroblasts. Mechanistically, TLR8 induces skin fibrosis and inflammation in a manner dependent on the MAPK, NF-κB and SMAD2/3 pathways. Subcutaneous injection of cu-cpt-8m significantly alleviated BLM-induced skin inflammation and fibrosis in vivo. Conclusion TLR8 might be a promising therapeutic target for improving the treatment strategy for skin inflammation and fibrosis in SSc.
doi_str_mv 10.1093/rheumatology/kead456
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TLR8 is an important innate immune mediator that is implicated in autoimmunity and fibrosis. However, the expression, mechanism of action, and pathogenic role of TLR8 in SSc remain unclear. The aim of this study was to explore the roles and underlying mechanisms of TLR8 in SSc. Methods The expression of TLR8 was analysed, based on a public dataset, and then verified in skin tissues and skin fibroblasts of SSc patients. The role of TLR8 in inflammation and fibrosis was investigated using a TLR8-overexpression vector, activator (VTX-2337), inhibitor (cu-cpt-8m), and TLR8 siRNA in skin fibroblasts. The pathogenic role of TLR8 in skin inflammation and fibrosis was further validated in a bleomycin (BLM)-induced mouse skin inflammation and fibrosis model. Results TLR8 levels were significantly elevated in SSc skin tissues and myofibroblasts, along with significant activation of the TLR8 pathway. In vitro studies showed that overexpression or activation of TLR8 by a recombinant plasmid or VTX-2337 upregulated IL-6, IL-1β, COL I, COL III and α-SMA in skin fibroblasts. Consistently, both TLR8-siRNA and cu-cpt-8m reversed the phenotypes observed in TLR8-activating fibroblasts. Mechanistically, TLR8 induces skin fibrosis and inflammation in a manner dependent on the MAPK, NF-κB and SMAD2/3 pathways. Subcutaneous injection of cu-cpt-8m significantly alleviated BLM-induced skin inflammation and fibrosis in vivo. Conclusion TLR8 might be a promising therapeutic target for improving the treatment strategy for skin inflammation and fibrosis in SSc.</description><identifier>ISSN: 1462-0324</identifier><identifier>ISSN: 1462-0332</identifier><identifier>EISSN: 1462-0332</identifier><identifier>DOI: 10.1093/rheumatology/kead456</identifier><identifier>PMID: 37665747</identifier><language>eng</language><publisher>England: Oxford University Press</publisher><subject>Animals ; Autoimmunity ; Bleomycin ; Disease Models, Animal ; Female ; Fibroblasts ; Fibroblasts - metabolism ; Fibrosis ; Humans ; Inflammation ; Inflammation - metabolism ; Innate immunity ; Male ; MAP kinase ; Mice ; NF-κB protein ; Phenotypes ; Scleroderma, Systemic - immunology ; Scleroderma, Systemic - metabolism ; Scleroderma, Systemic - pathology ; Signal Transduction ; siRNA ; Skin ; Skin - immunology ; Skin - metabolism ; Skin - pathology ; Smad2 protein ; Systemic sclerosis ; Therapeutic targets ; Toll-Like Receptor 8 - metabolism</subject><ispartof>Rheumatology (Oxford, England), 2024-05, Vol.63 (6), p.1710-1719</ispartof><rights>The Author(s) 2023. Published by Oxford University Press on behalf of the British Society for Rheumatology. All rights reserved. For permissions, please email: journals.permissions@oup.com 2023</rights><rights>The Author(s) 2023. Published by Oxford University Press on behalf of the British Society for Rheumatology. All rights reserved. For permissions, please email: journals.permissions@oup.com.</rights><rights>The Author(s) 2023. Published by Oxford University Press on behalf of the British Society for Rheumatology. All rights reserved. For permissions, please email: journals.permissions@oup.com</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-c254t-a1fbcca7529f6ac96b3f907454236ce2a19a4e2678d146b7bb28737e0d1244fa3</cites><orcidid>0000-0002-7794-2181</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>315,781,785,1585,27926,27927</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/37665747$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Kong, Xiangzhen</creatorcontrib><creatorcontrib>Jiang, Shuai</creatorcontrib><creatorcontrib>He, Qiuyu</creatorcontrib><creatorcontrib>Shi, Xiangguang</creatorcontrib><creatorcontrib>Pu, Weilin</creatorcontrib><creatorcontrib>Huang, Yan</creatorcontrib><creatorcontrib>Ma, Yanyun</creatorcontrib><creatorcontrib>Liu, Qingmei</creatorcontrib><creatorcontrib>Sun, Dayan</creatorcontrib><creatorcontrib>Huang, Delin</creatorcontrib><creatorcontrib>Wu, Fei</creatorcontrib><creatorcontrib>Li, Pengcheng</creatorcontrib><creatorcontrib>Tu, Wenzhen</creatorcontrib><creatorcontrib>Zhao, Yinhuan</creatorcontrib><creatorcontrib>Wang, Lei</creatorcontrib><creatorcontrib>Chen, Yuanyuan</creatorcontrib><creatorcontrib>Wu, Wenyu</creatorcontrib><creatorcontrib>Tang, Yulong</creatorcontrib><creatorcontrib>Zhao, Xiansheng</creatorcontrib><creatorcontrib>Zhu, Qing</creatorcontrib><creatorcontrib>Gao, Jian</creatorcontrib><creatorcontrib>Xu, Weihong</creatorcontrib><creatorcontrib>Shui, Xiaochuan</creatorcontrib><creatorcontrib>Qian, Feng</creatorcontrib><creatorcontrib>Wang, Jiucun</creatorcontrib><title>TLR8 aggravates skin inflammation and fibrosis by activating skin fibroblasts in systemic sclerosis</title><title>Rheumatology (Oxford, England)</title><addtitle>Rheumatology (Oxford)</addtitle><description>Abstract Objectives Innate immunity significantly contributes to SSc pathogenesis. TLR8 is an important innate immune mediator that is implicated in autoimmunity and fibrosis. However, the expression, mechanism of action, and pathogenic role of TLR8 in SSc remain unclear. The aim of this study was to explore the roles and underlying mechanisms of TLR8 in SSc. Methods The expression of TLR8 was analysed, based on a public dataset, and then verified in skin tissues and skin fibroblasts of SSc patients. The role of TLR8 in inflammation and fibrosis was investigated using a TLR8-overexpression vector, activator (VTX-2337), inhibitor (cu-cpt-8m), and TLR8 siRNA in skin fibroblasts. The pathogenic role of TLR8 in skin inflammation and fibrosis was further validated in a bleomycin (BLM)-induced mouse skin inflammation and fibrosis model. Results TLR8 levels were significantly elevated in SSc skin tissues and myofibroblasts, along with significant activation of the TLR8 pathway. In vitro studies showed that overexpression or activation of TLR8 by a recombinant plasmid or VTX-2337 upregulated IL-6, IL-1β, COL I, COL III and α-SMA in skin fibroblasts. Consistently, both TLR8-siRNA and cu-cpt-8m reversed the phenotypes observed in TLR8-activating fibroblasts. Mechanistically, TLR8 induces skin fibrosis and inflammation in a manner dependent on the MAPK, NF-κB and SMAD2/3 pathways. Subcutaneous injection of cu-cpt-8m significantly alleviated BLM-induced skin inflammation and fibrosis in vivo. Conclusion TLR8 might be a promising therapeutic target for improving the treatment strategy for skin inflammation and fibrosis in SSc.</description><subject>Animals</subject><subject>Autoimmunity</subject><subject>Bleomycin</subject><subject>Disease Models, Animal</subject><subject>Female</subject><subject>Fibroblasts</subject><subject>Fibroblasts - metabolism</subject><subject>Fibrosis</subject><subject>Humans</subject><subject>Inflammation</subject><subject>Inflammation - metabolism</subject><subject>Innate immunity</subject><subject>Male</subject><subject>MAP kinase</subject><subject>Mice</subject><subject>NF-κB protein</subject><subject>Phenotypes</subject><subject>Scleroderma, Systemic - immunology</subject><subject>Scleroderma, Systemic - metabolism</subject><subject>Scleroderma, Systemic - pathology</subject><subject>Signal Transduction</subject><subject>siRNA</subject><subject>Skin</subject><subject>Skin - immunology</subject><subject>Skin - metabolism</subject><subject>Skin - pathology</subject><subject>Smad2 protein</subject><subject>Systemic sclerosis</subject><subject>Therapeutic targets</subject><subject>Toll-Like Receptor 8 - metabolism</subject><issn>1462-0324</issn><issn>1462-0332</issn><issn>1462-0332</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2024</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqNkVtLw0AQhRdRbK3-A5EFX3yJ3Vt2k0cp3qAgSH0Os5tN3DaXmk2E_nu3F0V88mkG5juHmTkIXVJyS0nKp927HWro26otN9OVhVzE8giNqZAsIpyz45-eiRE6835JCIkpT07RiCspYyXUGJnF_DXBUJYdfEJvPfYr12DXFBXUwd21DYYmx4XTXeudx3qDwfQusK4p9_BupivwvQ9C7De-t7Uz2JvK7kTn6KSAytuLQ52gt4f7xewpmr88Ps_u5pFhsegjoIU2BlTM0kKCSaXmRUqUiAXj0lgGNAVhmVRJHg7TSmuWKK4sySkTogA-QTd733XXfgzW91ntvLFVBY1tB5-xRFJOYp6ygF7_QZft0DVhu4xTykXCkmRLiT1lwh2-s0W27lwN3SajJNuGkP0OITuEEGRXB_NB1zb_EX1_PQDTPdAO6_9ZfgFE-Zm7</recordid><startdate>20240503</startdate><enddate>20240503</enddate><creator>Kong, Xiangzhen</creator><creator>Jiang, Shuai</creator><creator>He, Qiuyu</creator><creator>Shi, Xiangguang</creator><creator>Pu, Weilin</creator><creator>Huang, Yan</creator><creator>Ma, Yanyun</creator><creator>Liu, Qingmei</creator><creator>Sun, Dayan</creator><creator>Huang, Delin</creator><creator>Wu, Fei</creator><creator>Li, Pengcheng</creator><creator>Tu, Wenzhen</creator><creator>Zhao, Yinhuan</creator><creator>Wang, Lei</creator><creator>Chen, Yuanyuan</creator><creator>Wu, Wenyu</creator><creator>Tang, Yulong</creator><creator>Zhao, Xiansheng</creator><creator>Zhu, Qing</creator><creator>Gao, Jian</creator><creator>Xu, Weihong</creator><creator>Shui, Xiaochuan</creator><creator>Qian, Feng</creator><creator>Wang, Jiucun</creator><general>Oxford University Press</general><general>Oxford Publishing Limited (England)</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QP</scope><scope>K9.</scope><scope>NAPCQ</scope><scope>7X8</scope><orcidid>https://orcid.org/0000-0002-7794-2181</orcidid></search><sort><creationdate>20240503</creationdate><title>TLR8 aggravates skin inflammation and fibrosis by activating skin fibroblasts in systemic sclerosis</title><author>Kong, Xiangzhen ; 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Calcified Tissue Abstracts</collection><collection>ProQuest Health &amp; Medical Complete (Alumni)</collection><collection>Nursing &amp; Allied Health Premium</collection><collection>MEDLINE - Academic</collection><jtitle>Rheumatology (Oxford, England)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Kong, Xiangzhen</au><au>Jiang, Shuai</au><au>He, Qiuyu</au><au>Shi, Xiangguang</au><au>Pu, Weilin</au><au>Huang, Yan</au><au>Ma, Yanyun</au><au>Liu, Qingmei</au><au>Sun, Dayan</au><au>Huang, Delin</au><au>Wu, Fei</au><au>Li, Pengcheng</au><au>Tu, Wenzhen</au><au>Zhao, Yinhuan</au><au>Wang, Lei</au><au>Chen, Yuanyuan</au><au>Wu, Wenyu</au><au>Tang, Yulong</au><au>Zhao, Xiansheng</au><au>Zhu, Qing</au><au>Gao, Jian</au><au>Xu, Weihong</au><au>Shui, Xiaochuan</au><au>Qian, Feng</au><au>Wang, Jiucun</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>TLR8 aggravates skin inflammation and fibrosis by activating skin fibroblasts in systemic sclerosis</atitle><jtitle>Rheumatology (Oxford, England)</jtitle><addtitle>Rheumatology (Oxford)</addtitle><date>2024-05-03</date><risdate>2024</risdate><volume>63</volume><issue>6</issue><spage>1710</spage><epage>1719</epage><pages>1710-1719</pages><issn>1462-0324</issn><issn>1462-0332</issn><eissn>1462-0332</eissn><abstract>Abstract Objectives Innate immunity significantly contributes to SSc pathogenesis. TLR8 is an important innate immune mediator that is implicated in autoimmunity and fibrosis. However, the expression, mechanism of action, and pathogenic role of TLR8 in SSc remain unclear. The aim of this study was to explore the roles and underlying mechanisms of TLR8 in SSc. Methods The expression of TLR8 was analysed, based on a public dataset, and then verified in skin tissues and skin fibroblasts of SSc patients. The role of TLR8 in inflammation and fibrosis was investigated using a TLR8-overexpression vector, activator (VTX-2337), inhibitor (cu-cpt-8m), and TLR8 siRNA in skin fibroblasts. The pathogenic role of TLR8 in skin inflammation and fibrosis was further validated in a bleomycin (BLM)-induced mouse skin inflammation and fibrosis model. Results TLR8 levels were significantly elevated in SSc skin tissues and myofibroblasts, along with significant activation of the TLR8 pathway. In vitro studies showed that overexpression or activation of TLR8 by a recombinant plasmid or VTX-2337 upregulated IL-6, IL-1β, COL I, COL III and α-SMA in skin fibroblasts. Consistently, both TLR8-siRNA and cu-cpt-8m reversed the phenotypes observed in TLR8-activating fibroblasts. Mechanistically, TLR8 induces skin fibrosis and inflammation in a manner dependent on the MAPK, NF-κB and SMAD2/3 pathways. Subcutaneous injection of cu-cpt-8m significantly alleviated BLM-induced skin inflammation and fibrosis in vivo. Conclusion TLR8 might be a promising therapeutic target for improving the treatment strategy for skin inflammation and fibrosis in SSc.</abstract><cop>England</cop><pub>Oxford University Press</pub><pmid>37665747</pmid><doi>10.1093/rheumatology/kead456</doi><tpages>10</tpages><orcidid>https://orcid.org/0000-0002-7794-2181</orcidid></addata></record>
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source Oxford University Press Journals All Titles (1996-Current); MEDLINE
subjects Animals
Autoimmunity
Bleomycin
Disease Models, Animal
Female
Fibroblasts
Fibroblasts - metabolism
Fibrosis
Humans
Inflammation
Inflammation - metabolism
Innate immunity
Male
MAP kinase
Mice
NF-κB protein
Phenotypes
Scleroderma, Systemic - immunology
Scleroderma, Systemic - metabolism
Scleroderma, Systemic - pathology
Signal Transduction
siRNA
Skin
Skin - immunology
Skin - metabolism
Skin - pathology
Smad2 protein
Systemic sclerosis
Therapeutic targets
Toll-Like Receptor 8 - metabolism
title TLR8 aggravates skin inflammation and fibrosis by activating skin fibroblasts in systemic sclerosis
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