Article(id=1208791314603315666, tenantId=1146029695717560320, journalId=1189873630562394117, issueId=1208791311621157694, articleNumber=null, orderNo=null, doi=10.11855/j.issn.0577-7402.2021.11.02, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1617465600000, receivedDateStr=2021-04-04, revisedDate=1631808000000, revisedDateStr=2021-09-17, acceptedDate=null, acceptedDateStr=null, onlineDate=1766127907658, onlineDateStr=2025-12-19, pubDate=1638028800000, pubDateStr=2021-11-28, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1766127907658, onlineIssueDateStr=2025-12-19, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1766127907658, creator=13701087609, updateTime=1766127907658, updator=13701087609, issue=Issue{id=1208791311621157694, tenantId=1146029695717560320, journalId=1189873630562394117, year='2021', volume='46', issue='11', pageStart='1061', pageEnd='1164', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=0, createTime=1766127906946, creator=13701087609, updateTime=1766128932678, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1208795613920104935, tenantId=1146029695717560320, journalId=1189873630562394117, issueId=1208791311621157694, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1208795613920104936, tenantId=1146029695717560320, journalId=1189873630562394117, issueId=1208791311621157694, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=1068, endPage=1076, ext={EN=ArticleExt(id=1208791316046156247, articleId=1208791314603315666, tenantId=1146029695717560320, journalId=1189873630562394117, language=EN, title=SND1 recognize the methylation sites of TINCR to promote growth of keloid fibroblasts, columnId=1190310110212751762, journalTitle=Medical Journal of Chinese People’s Liberation Army, columnName=Basic Research, runingTitle=null, highlight=null, articleAbstract=
Objective To investigate the interaction between staphylococcal nuclease domain containing protein 1 (SND1)and tissue differentiation-inducing non-coding RNA (TINCR), and the effect of SND1 on TINCR expression level and keloid growth. Methods Keloid tissue samples (n=27) were collected from patients with Ⅱ- or Ⅲ-degree burns who received treatment in Shaanxi Provincial People's Hospital from June 2016 to May 2018. Bioinformatics methods were used to predict RNA methylation sites in TINCR sequences; human primary normal skin fibroblasts (HFs) and keloid fibroblasts (KFs) were cultured and divided into HFs group and KFs group. KFs in logarithmic growth phase were taken, and divided into: (1) control group, empty vector group and methyltransferase-like protein 3 (METTL3) overexpression group, (2) control group and 3-deazaadenosine (DAA) group, and(3) control group, SND1 recombinant proteome group and SND1 proteome+DAA group. The relative expression level of TINCR in HFs and KFs was determined by real-time quantitative PCR (RT-qPCR); methylated RNA immunoprecipitation (MeRIP) followed by RT-qPCR was performed to analyze the methylation levels of TINCR; Western blotting was used to detect the relative expression levels of SND1 and METTL3 protein; the half-life of TINCR was determined by actinomycin D treatment combined with RT-qPCR,and the cell proliferation capacity was assessed with CCK-8 and clone assays. A keloid xenograft model was generated with 18 BALB/c nude mice, and then randomly divided into three groups (6 mice in each group): keloid group, keloid+SND1 recombinant protein group, and keloid+SND1 recombinant protein+DAA group. Keloid tissue growth was observed by HE staining; the expression level of SND1 in keloid tissue was detected by immunohistochemistry staining and Western blotting. Results The third exon of TINCR contains seven potential RNA methylation sites. The relative expression level and methylation level of TINCR elevated obviously in KFs than in HFs (5.43±0.35 vs. 1.00±0.11, P<0.01; 19.73%±1.56% vs. 10.25%±1.13%, P<0.01), and the protein levels of SND1 and METTL3 in KFs were significantly increased (P<0.01), methylated TINCR could bind both SND1 and METTL3. Compared with empty vector group, overexpression of METTL3 stimulated the mRNA and protein expression of METTL3 (mRNA: 6.03±0.55 vs. 1.09±0.09, P<0.01; protein: 4.33±0.35 vs. 0.96±0.08, P<0.01) and increased the methylation level of TINCR (32.89%±2.88%vs. 19.04%±1.72%, P<0.01) and relative expression level (4.65±0.32 vs. 1.00±0.10, P<0.01). Compared with control group,DAA treatment reduced the stability [(8.50±1.13) h vs. (12.90±1.41) h, P<0.001] and the methylation level (7.43%±0.55% vs.18.88%±1.76%, P<0.01) of TINCR, and inhibited the viability and clonogenic ability of KFs (P<0.01). Compared with control group, SND1 recombinant protein treatment increased the stability of TINCR [(23.95±1.25) h vs. (13.10±1.33) h, P<0.01],cell viability and clonogenic ability (P<0.01), but showed no significant effect on TINCR methylation levels (20.15%±1.74% vs.19.04%±1.77%, P>0.05); DAA treatment may abolish the effect of SND1 recombinant protein on TINCR stability [(12.00±1.21) h vs. (23.95±1.44) h, P<0.01], cell viability and clonogenic ability (P<0.01). Compared with the keloid group, a large number of fibroblasts and collagen fibers existed in the dermal layer of keloid+SND1 recombinant protein group. Furthermore, the percentage of positive SND1 cell and the relative expression level of protein in keloid tissue increased significantly (63.43%±3.32% vs.21.16%±4.67%, P<0.01; 2.54±0.13 vs. 1.00±0.10, P<0.01); However, DAA treatment made large amount of loose fibrous collagen in keloid tissue, and the percentage of positive SND1 cells and the relative expression level of protein decreased significantly(38.52%±6.88% vs. 63.43%±3.32%, P<0.01; 1.07±0.09 vs. 2.54±0.13, P<0.01). Conclusion TINCR is hypermethylated in KFs. SND1 can recognize and bind the methylation sites of TINCR, accelerate the stability of TINCR and promote the growth of TINCR mediated keloid.
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目的 探讨葡萄球菌核酸酶结构域蛋白1(SND1)与组织分化诱导非编码RNA(TINCR)的相互作用及其对TINCR表达水平和瘢痕疙瘩生长的影响。方法 收集2016年6月—2018年5月在陕西省人民医院接受治疗的Ⅱ、Ⅲ度烧伤患者的瘢痕疙瘩组织样本(n=27)。运用生物信息学方法预测TINCR序列中的RNA甲基化位点;培养人原代正常皮肤成纤维细胞(HFs)和瘢痕疙瘩成纤维细胞(KFs),设置HFs组和KFs组。取对数生长期KFs,设置:(1)对照组、空载组及甲基转移酶样蛋白3(METTL3)过表达组;(2)对照组和3-脱氮基腺苷(DAA)组;(3)对照组、SND1重组蛋白组及SND1重组蛋白+DAA组。采用实时定量PCR(RT-qPCR)检测HFs和KFs中TINCR的相对表达水平,甲基化RNA免疫沉淀技术(MeRIP)联合RT-qPCR检测TINCR的甲基化水平,Western blotting检测SND1和METTL3蛋白的相对表达水平,放线菌素D处理联合RT-qPCR检测TINCR残留水平,CCK-8法和克隆形成实验检测细胞增殖能力。取18只BALB/c裸鼠,构建瘢痕疙瘩异种移植模型,随机分为瘢痕疙瘩组、瘢痕疙瘩+SND1重组蛋白组及瘢痕疙瘩+SND1重组蛋白+DAA组,每组6只,采用HE染色观察瘢痕疙瘩组织生长情况,免疫组化染色和Western blotting检测SND1在瘢痕疙瘩组织中的表达水平。结果 TINCR第三外显子含有7个潜在的RNA甲基化位点。与HFs相比,KFs中TINCR相对表达水平(5.43±0.35 vs. 1.00±0.11,P<0.01)和甲基化水平(19.73%±1.56% vs. 10.25%±1.13%,P<0.01)均明显升高,SND1和METTL3蛋白相对表达水平明显增高(P<0.01),甲基化的TINCR与SND1和METTL3均有结合。与空载组相比,METTL3过表达可促进METTL3 mRNA和蛋白的表达(mRNA:6.03±0.55 vs. 1.09±0.09,P<0.01;蛋白:4.33±0.35 vs. 0.96±0.08,P<0.01)、增高TINCR甲基化水平(32.89%±2.88% vs. 19.04%±1.72%,P<0.01)和相对表达水平(4.65±0.32 vs. 1.00±0.10,P<0.01)。与对照组相比,DAA处理可降低TINCR的稳定性[(8.50±1.13) h vs. (12.90±1.41) h,P<0.001]和甲基化水平(7.43%±0.55% vs. 18.88%±1.76%,P<0.01),抑制KFs的活力和克隆形成能力(P<0.01)。与对照组相比,SND1重组蛋白处理可增加TINCR的稳定性[(23.95±1.25) h vs. (13.10±1.33) h,P<0.01]、细胞活力和克隆形成能力(P<0.01),但对TINCR甲基化水平(20.15%±1.74% vs. 19.04%±1.77%,P>0.05)无明显影响;DAA处理可消除SND1重组蛋白对TINCR稳定性[(12.00±1.21) h vs. (23.95±1.44) h,P<0.01]、细胞活力和克隆形成能力的影响(P<0.01)。与瘢痕疙瘩组相比,瘢痕疙瘩+SND1重组蛋白组真皮层有大量成纤维细胞和胶原纤维,瘢痕疙瘩组织中SND1阳性细胞百分比(63.43%±3.32%vs. 21.16%±4.67%,P<0.01)和蛋白相对表达水平(2.54±0.13 vs. 1.00±0.10,P<0.01)明显增高;而经DAA处理后,瘢痕疙瘩组织中有大量疏松的胶原纤维,SND1阳性细胞百分比(38.52%±6.88% vs. 63.43%±3.32%,P<0.01)和蛋白表达水平(1.07±0.09 vs. 2.54±0.13,P<0.01)明显降低。结论 KFs中TINCR呈高甲基化水平,SND1可识别并结合TINCR的甲基化位点,增强TINCR的稳定性,促进TINCR介导的瘢痕疙瘩生长。
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秦高平,医学博士,主任医师,主要从事烧伤整形医学美容研究
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1Department of Burn and Plastic Surgery, Shaanxi Provincial People's Hospital, Xi’an 710068, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1208791318575321694, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1208791314603315666, authorId=1208791318382383693, language=CN, stringName=秦高平, firstName=高平, middleName=null, lastName=秦, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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1陕西省人民医院烧伤整形医学美容外科,西安 710068, bio={"content":"
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1Department of Burn and Plastic Surgery, Shaanxi Provincial People's Hospital, Xi’an 710068, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1208791318856340075, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1208791314603315666, authorId=1208791318680179298, language=CN, stringName=孙要文, firstName=要文, middleName=null, lastName=孙, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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1Department of Burn and Plastic Surgery, Shaanxi Provincial People's Hospital, Xi’an 710068, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1208791320563421856, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1208791314603315666, authorId=1208791319233827465, language=CN, stringName=李建武, firstName=建武, middleName=null, lastName=李, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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24(8): e47261., articleTitle=The Tudor SND1 protein is an m6A RNA reader essential for replication of Kaposi's sarcoma-associated herpesvirus, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1208791318164279866, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1208791314603315666, xref=1, ext=[AuthorCompanyExt(id=1208791318172668476, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1208791314603315666, companyId=1208791318164279866, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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1陕西省人民医院烧伤整形医学美容外科,西安 710068)]), AuthorCompany(id=1208791318277526083, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1208791314603315666, xref=2, ext=[AuthorCompanyExt(id=1208791318285914692, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1208791314603315666, companyId=1208791318277526083, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
2Department of Hepatobiliary Surgery, Shaanxi Provincial People's Hospital, Xi’an 710068, China), AuthorCompanyExt(id=1208791318298497607, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1208791314603315666, companyId=1208791318277526083, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
2陕西省人民医院肝胆外科,西安 710068)])], figs=[ArticleFig(id=1208791323117753120, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1208791314603315666, language=EN, label=Fig. 1, caption=
Prediction of methylation site of TINCR in KFs and detection of TINCR methylation level in HFs and KFs, figureFileSmall=/11uudxEWuHzCrv6fkk0NA==, figureFileBig=C9IXJpZtklW3hgTx2fWq7g==, tableContent=null), ArticleFig(id=1208791323218416422, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1208791314603315666, language=CN, label=图1, caption=
KFs中TINCR甲基化位点预测及HFs和KFs中TINCR甲基化水平检测I. Input,即总蛋白对照;P. Pellet,即甲基化抗体的免疫沉淀物;NC. 非特异性IgG的免疫沉淀物,作为阴性对照;KFs. 瘢痕疙瘩成纤维细胞;HFs. 人原代正常皮肤成纤维细胞;SND1. 葡萄球菌核酸酶结构域蛋白1;TINCR. 组织分化诱导非编码RNA;METTL3.甲基转移酶样蛋白3;A. SRAMP网站预测TINCR甲基化位点;B. RT-qPCR检测HFs和KFs中TINCR的相对表达水平;C. MeRIP联合RT-qPCR检测HFs和KFs中TINCR的甲基化水平;D. MeRIP联合Western blotting检测SND1和METTL3在甲基化TINCR中的富集情况;E. Western blotting检测HFs和KFs中SND1、METTL3蛋白表达水平;与HFs组比较,(1)P<0.01。
, figureFileSmall=/11uudxEWuHzCrv6fkk0NA==, figureFileBig=C9IXJpZtklW3hgTx2fWq7g==, tableContent=null), ArticleFig(id=1208791323411354415, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1208791314603315666, language=EN, label=Fig. 2, caption=
Effect of METTL3 overexpression on the methylation and relative expression levels of TINCR in KFs, figureFileSmall=OkLFTC7TUY4taj+dCxfu+A==, figureFileBig=PLKTpywzzXfSXLaQGx7AIw==, tableContent=null), ArticleFig(id=1208791323491046196, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1208791314603315666, language=CN, label=图2, caption=
KFs中过表达METTL3对TINCR甲基化水平和相对表达水平的影响KFs. 瘢痕疙瘩成纤维细胞;TINCR. 组织分化诱导非编码RNA;METTL3. 甲基转移酶样蛋白3;A. RT-qPCR检测METTL3 mRNA的相对表达水平;B. Western blotting检测METTL3蛋白的相对表达水平;C. MeRIP联合RT-qPCR检测KFs中TINCR的甲基化水平;D. RT-qPCR检测TINCR的相对表达水平;与对照组比较,(1)P<0.01;与空载组比较,(2)P<0.01。
, figureFileSmall=OkLFTC7TUY4taj+dCxfu+A==, figureFileBig=PLKTpywzzXfSXLaQGx7AIw==, tableContent=null), ArticleFig(id=1208791323633652536, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1208791314603315666, language=EN, label=Fig. 3, caption=
Effects of DAA treatment on the methylation level of TINCR and the proliferation ability of KFs, figureFileSmall=ktlMNyB2sboM7tzzZYtxvw==, figureFileBig=IdnDUn/gGBRu7tT5yikIuQ==, tableContent=null), ArticleFig(id=1208791324854195003, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1208791314603315666, language=CN, label=图3, caption=
DAA处理对TINCR甲基化水平和KFs增殖能力的影响KFs. 瘢痕疙瘩成纤维细胞;DAA. 3-脱氮基腺苷;TINCR. 组织分化诱导非编码RNA;A. DAA处理24 h后评估TINCR的稳定性;B.DAA处理24 h后CCK-8法检测细胞活力;C. DAA处理24 h后MeRIP检测TINCR甲基化水平;D. DAA处理24 h后克隆形成实验检测细胞克隆形成能力;与对照组比较,(1)P<0.001;与24 h比较,(2)P<0.01;与48 h比较,(3)P<0.01。
, figureFileSmall=ktlMNyB2sboM7tzzZYtxvw==, figureFileBig=IdnDUn/gGBRu7tT5yikIuQ==, tableContent=null), ArticleFig(id=1208791325013578562, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1208791314603315666, language=EN, label=Fig. 4, caption=
Effects of KFs treated with SND1 recombinant protein alone or together with DAA on the TINCR stability and cell proliferation ability, figureFileSmall=v/O/wDnpl3VHhA+fzrziLg==, figureFileBig=jx3ZZFzZU4WB7DkZyBE8mA==, tableContent=null), ArticleFig(id=1208791325126824775, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1208791314603315666, language=CN, label=图4, caption=
SND1重组蛋白单独或与DAA共同处理KFs对TINCR稳定性和细胞增殖能力的影响SND1. 葡萄球菌核酸酶结构域蛋白1;TINCR. 组织分化诱导非编码RNA;DAA. 3-脱氮基腺苷;A. Western blotting检测SND1蛋白表达水平;B. TINCR的稳定性;C. TINCR甲基化水平;D. 细胞活力;E. 细胞克隆形成能力;与对照组比较,(1)P<0.001;与SND1重组蛋白组比较,(2)P<0.001;与24 h比较,(3)P<0.01;与48 h比较,(4)P<0.01。
, figureFileSmall=v/O/wDnpl3VHhA+fzrziLg==, figureFileBig=jx3ZZFzZU4WB7DkZyBE8mA==, tableContent=null), ArticleFig(id=1208791325210710861, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1208791314603315666, language=EN, label=Fig. 5, caption=
Effects of SND1 recombinant protein treatment alone or co-treatment with DAA on keloid tissue growth in vivo, figureFileSmall=7QGx4EFJUaPyiWK2mLkTrQ==, figureFileBig=1dqT1LKojKk0g3Eg7OdXlg==, tableContent=null), ArticleFig(id=1208791325353317202, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1208791314603315666, language=CN, label=图5, caption=
SND1重组蛋白单独或与DAA共同处理对体内瘢痕疙瘩组织生长的影响SND1. 葡萄球菌核酸酶结构域蛋白1;DAA. 3-脱氮基腺苷;A. 各组裸鼠瘢痕疙瘩组织生长情况(HE ×40);B. 各组裸鼠瘢痕疙瘩组织中SND1免疫组化染色情况(×400)及SND1阳性细胞百分比比较;C. 各组裸鼠瘢痕疙瘩组织中SND1蛋白相对表达水平比较(Western blotting);与瘢痕疙瘩组比较,(1)P<0.01;与瘢痕疙瘩+SND1重组蛋白组比较,(2)P<0.01。
, figureFileSmall=7QGx4EFJUaPyiWK2mLkTrQ==, figureFileBig=1dqT1LKojKk0g3Eg7OdXlg==, tableContent=null), ArticleFig(id=1208791325458174806, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1208791314603315666, language=EN, label=Tab. 1, caption=
Primer sequence of RT-qPCR
, figureFileSmall=null, figureFileBig=null, tableContent=
| 基因 | 引物序列(5'-3') |
|---|
| TINCR | 正义:TAGATCTCACTCCAGGGTCTG |
| 反义:CAGAGCTGAAAGGCTCAAGG |
| METTL3 | 正义:AGAGGAGGAGAAGGTGGCAGAG |
| 反义:AGGCTCACTTGCAAGTAAAAGGAAG |
| GAPDH | 正义:TGATGACATCAAGAAGGTGG |
| 反义:TTGTCATACCAGGAAATGAGC |
), ArticleFig(id=1208791325537866586, tenantId=1146029695717560320, journalId=1189873630562394117, articleId=1208791314603315666, language=CN, label=表1, caption=
RT-qPCR引物序列
, figureFileSmall=null, figureFileBig=null, tableContent=
| 基因 | 引物序列(5'-3') |
|---|
| TINCR | 正义:TAGATCTCACTCCAGGGTCTG |
| 反义:CAGAGCTGAAAGGCTCAAGG |
| METTL3 | 正义:AGAGGAGGAGAAGGTGGCAGAG |
| 反义:AGGCTCACTTGCAAGTAAAAGGAAG |
| GAPDH | 正义:TGATGACATCAAGAAGGTGG |
| 反义:TTGTCATACCAGGAAATGAGC |
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