Article(id=1322185585649890121, tenantId=1146029695717560320, journalId=1319373162502258839, issueId=1322185527667839311, articleNumber=null, orderNo=null, doi=10.16016/j.2097-0927.202505024, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1748102400000, receivedDateStr=2025-05-25, revisedDate=1748880000000, revisedDateStr=2025-06-03, acceptedDate=null, acceptedDateStr=null, onlineDate=1793163208638, onlineDateStr=2026-10-28, pubDate=1752508800000, pubDateStr=2025-07-15, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1793163208638, onlineIssueDateStr=2026-10-28, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1793163208638, creator=13701087609, updateTime=1793163208638, updator=13701087609, issue=Issue{id=1322185527667839311, tenantId=1146029695717560320, journalId=1319373162502258839, year='2025', volume='47', issue='13', pageStart='1413', pageEnd='1555', issueExtLink='null', onlineDate='null', pubDate='1752508800000', pubDateStr='2025-07-15', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=0, createTime=1793163194815, creator='13701087609', updateTime=1793163440436, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1322186557939892925, tenantId=1146029695717560320, journalId=1319373162502258839, issueId=1322185527667839311, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1322186557939892926, tenantId=1146029695717560320, journalId=1319373162502258839, issueId=1322185527667839311, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=1463, endPage=1474, ext={EN=ArticleExt(id=1322185585859605322, articleId=1322185585649890121, tenantId=1146029695717560320, journalId=1319373162502258839, language=EN, title=Endothelial cells nurture stem cell-like characteristics of osteosarcoma cells in a perivascular niche by CXCL12/CXCR4 pathway, columnId=1320434418116837551, journalTitle=Journal of Army Medical University, columnName=Basic Medicine, runingTitle=null, highlight=null, articleAbstract=
Objective To investigate the effect of endothelial cells in the perivascular niche on the stem cell-like characteristics of osteosarcoma cells and primarily explore the possible molecular mechanism.
Methods A co-culture model was established in vitro using SV40T- human umbilical vein endothelial cells (HUVEC-T1) and osteosarcoma stem cells (OSCs) derived from the human osteosarcoma cell line 143B.Thus, there were 2 groups of cells, OSCs and co-cultured OSCs. The self-renewal capacity of OSCs between the 2 groups was assessed using a limiting dilution forming sphere assay. Flow cytometry and Western blotting were used to detect the expression of stem cell marker CD133 and stemness transcription factors SOX2 and NANOG. Fourteen female nude mice (4~6 weeks old, weighing 18~20 g) were randomly and equally divided into 2 groups of subcutaneous xenograft models: the control group (OSCs suspension) and the experimental group (OSCs+HUVEC-T1 mixed suspension). The tumor volume and mass were compared between the 2 xenograft groups. Immunofluorescence (IF) staining was used to verify the spatial proximity between endothelial cells and OSCs in vivo, while immunohistochemistry was employed to compare microvessel density (MVD) and CD133 expression level between the 2 groups. RNA-seq was performed to identify potential signaling pathways of endothelial cells affecting the stemness of OSCs. PCR and Western blotting were applied to confirm the RNA-seq findings. Exogenous protein treatment, IF staining, Western blotting and sphere formation assay were utilized to preliminarily validate the role of the identified pathway in regulating the stemness phenotype of OSCs.
Results The in vitro co-culture model of HUVEC-T1 and OSCs was successfully established. Compared with the control group, the co-culture group exhibited significantly enhanced self-renewal ability of OSCs, laeger proportion of the stemness marker CD133+ [(8.20±1.64)% vs (4.32±1.34)%, P<0.05], enhanced expression of CD117, SOX2 and NANOG (P<0.05), along with more sphere formation (P<0.05) and elevated SOX2/NANOG protein levels. The xenograft mice from the experimental group showed larger tumor volume (643.10±413.50 vs 247.90±93.66 mm³, P<0.05) and heavier tumor weight (0.52±0.27 vs 0.24±0.10 g, P<0.05) when compared the control group, correspondingly showing increased MVD (22.57±11.84 vs 11.43±5.38, P<0.05) and elevated CD133 expression (P<0.05). IF staining confirmed the adjacency of CD31-labeled endothelial cells and CD133-labeled OSCs in vivo. RNA-seq and functional experiments demonstrated that CXCR4 was highly expressed in co-cultured OSCs, CXCL12 was highly expressed in co-cultured endothelial cells, and exogenous CXCL12 promoted the sphere formation and expression levels of SOX2 and NANOG of OSCs (P<0.05).
Conclusion Endothelial cells within the perivascular niche may promote the stemness phenotype of osteosarcoma cells via the CXCL12/CXCR4 pathway.
, authors=Ya CAO
1, Yang LIU
2, Yang WANG
2, Qiaonan GUO
1, Yangfan LYU
1, Guosheng ZHAO
2, authorsList=Ya CAO, Yang LIU, Yang WANG, Qiaonan GUO, Yangfan LYU, Guosheng ZHAO, authorCompany=null, correspAuthors=Guosheng ZHAO, authorNote=null, correspAuthorsNote=null, copyrightStatement=© 2025 Journal of Army Medical University, copyrightOwner=Editorial Office of Journal of Army Medical University, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1322185588967584601, articleId=1322185585649890121, tenantId=1146029695717560320, journalId=1319373162502258839, language=CN, title=血管周围微环境中内皮细胞通过CXCL12/CXCR4信号通路促进骨肉瘤细胞干性表型, columnId=1322185528879993170, journalTitle=陆军军医大学学报, columnName=基础医学, runingTitle=null, highlight=null, articleAbstract=
目的 探究体内外血管周围微环境中血管内皮细胞对骨肉瘤细胞干性表型的影响,并初步分析其可能的分子机制。
方法 构建SV40T转化人脐静脉内皮细胞(human umbilical vein endothelial cells-T1,HUVEC-T1)与人骨肉瘤细胞系143B骨肉瘤干细胞(osteosarcoma stem cells,OSCs)体外共培养模型。体外实验分为单独培养组和共培养组,利用极限稀释克隆成球实验检测2组OSCs自我更新能力差异,利用流式细胞技术和Western blot检测2组干性标记物CD133和干性转录因子SOX2、NANOG的表达差异。采用14只雌性裸鼠(体质量18~20 g,4~6周龄)按随机数字表法分为2组(n=7),分别构建皮下移植瘤模型:注射OSCs悬液(对照组),注射OSCs+HUVEC-T1混合悬液(实验组),比较2组肿瘤体积及质量的差异。通过免疫荧光验证内皮细胞与OSCs的体内毗邻关系,通过免疫组化比较2组微血管密度(microvessel density,MVD)与CD133表达差异。通过RNA-seq筛选内皮细胞影响OSCs干性表型的潜在信号通路,利用RT-qPCR、Western blot验证测序结果。利用外源性蛋白、免疫荧光、Western blot、克隆成球等功能实验初步验证该通路调控OSCs表型的作用。
结果 成功构建HUVEC-T1与OSCs体外直接共培养模型,与对照组比较,共培养组中OSCs自我更新能力显著增强,干性标志物CD133阳性比例升高[(8.20±1.64)% vs (4.32±1.34)%,P<0.05],CD117、SOX2、NANOG表达增加(P<0.05),成球数量(P<0.05)及SOX2/NANOG蛋白表达增加。实验组移植瘤体积[(643.10±413.50) vs (247.90±93.66) mm³,P<0.05]和质量[(0.52±0.27) vs (0.24±0.10) g,P<0.05]均高于对照组,对应其MVD[(22.57±11.84) vs (11.43±5.38),P<0.05]与CD133表达也增加(P<0.05)。免疫荧光证实CD31标记的内皮细胞与CD133标记的OSCs在移植瘤内存在毗邻关系。RNA-seq与功能实验发现CXCR4在共培养的OSCs中表达升高,CXCL12在共培养的内皮细胞中高表达,而外源性的CXCL12能提高OSCs的成球能力和干性标记物SOX2、NANOG表达(P<0.05)。
结论 血管周围微环境中内皮细胞可能通过CXCL12/CXCR4通路促进骨肉瘤细胞的干性表型维持。
, authors=曹亚
1, 刘扬
2, 汪洋
2, 郭乔楠
1, 吕杨帆
1, 赵郭盛
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细胞培养的形态与模式图A:贴壁培养和悬浮培养的143B细胞形态图;B:共培养的模式示意图
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143B细胞与HUVEC-T1共培养后其干性表型变化a:P<0.05
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143B细胞与HUVEC-T1混合注射后其体内成瘤能力变化a:P<0.05
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143B肿瘤细胞与HUVEC-T1细胞混合注射对其体内CD133表达和MVD影响a:P<0.05
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143B OSCs与HUVEC-T1混合注射的裸鼠移植瘤中OSCs与血管内皮细胞分布情况白色箭头示:两种细胞紧邻区域
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单独培养OSCs和与HUVEC-T1共培养OSCs的RNA-seq结果分析A:RNA-seq检测单独培养143B OSCs和与HUVEC-T1细胞共培养143B OSCs基因表达差异的热图;B:2组细胞基因表达差异火山图;C:2组细胞KEGG通路富集分析情况;D:针对细胞因子受体作用通路DEGs的表达热图分析
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CXCL12/CXCR4信号轴在内皮细胞调控OSCs干性中的潜在作用1:单独培养组;2:143B OSCs与HUVEC-T1细胞共培养组;a:P<0.05A:RT-qPCR检测2组OSCs细胞CXCR4的mRNA表达差异;B:Western blot检测2组OSCs细胞CXCR4的蛋白表达差异;C:Western blot检测各组HUVEC-T1和143B细胞中CXCL12蛋白表达变化;D:免疫荧光检测混合注射移植瘤中蛋白分布情况 白色箭头:示荧光融合区域;E:混合注射组移植瘤CXCL12免疫组化染色的代表性图片 红色箭头:示CXCL12高表达的脉管周围肿瘤细胞区域,黑色箭头:示CXCL12低表达的脉管周围肿瘤细胞;F:对照组与CXCL12组的成球实验直径和球数对比;G:Western blot检测143B细胞中NANOG和SOX2蛋白表达及统计差异
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