目的探讨外泌体转运miRNA-155靶向胶原三螺旋重复蛋白1(CTHRC1)对胃癌细胞腹膜种植转移的影响。方法提取胃癌BCG-823细胞外泌体并采用透射电子显微镜鉴定;实时荧光定量PCR检测胃癌BCG-823细胞和外泌体miRNA-155水平;激光共聚焦显微镜观...目的探讨外泌体转运miRNA-155靶向胶原三螺旋重复蛋白1(CTHRC1)对胃癌细胞腹膜种植转移的影响。方法提取胃癌BCG-823细胞外泌体并采用透射电子显微镜鉴定;实时荧光定量PCR检测胃癌BCG-823细胞和外泌体miRNA-155水平;激光共聚焦显微镜观察人腹膜间皮HMrSV5细胞对外泌体吞噬情况;设立阴性对照组、外泌体组和miRNA-155mimic组,通过划痕实验检测外泌体转运miRNA-155对腹膜间皮细胞HMrSV5迁移力的影响;利用生物信息预测软件结合荧光素酶报告基因检测验证miRNA-155的靶基因;Western blotting检测细胞CTHRC1蛋白表达。结果提取的外泌体呈现杯口状,直径40-150nm,外泌体标志性蛋白CD9、CD81呈阳性,而内质网分子伴侣Calnexin不表达;外泌体miRNA-155表达水平显著高于胃癌BCG-823细胞(P<0.05);采用PKH26对外泌体标记后在显微镜下呈红色,其主要分布在人腹膜间皮细胞HMrSV5的细胞质内,且视野下大部分细胞均可见红色荧光。利用生物分析软件(TargetScan,CLIP-Seq,miRDB and miRanda)预测了miRNA-155的下游靶基因为CTHRC1。与阴性对照组比较,外泌体组和miRNA-155mimic组腹膜间皮细胞迁移力、细胞增殖、细胞活力和细胞迁移显著增加,且miRNA-155mimic组高于外泌体组,其中外泌体中miRNA-155表达水平为0.49±0.03,CTHRC1蛋白表达水平显著降低,且miRNA-155mimic组低于外泌体组(P<0.05)。结论胃癌细胞来源的外泌体可促进腹膜间皮细胞迁移,因此增加肿瘤转移风险,其机制可能是外泌体内过表达的miRNA-155靶向抑制CTHRC1蛋白表达水平所引起。展开更多
Background:Sweat glands(SGs)have low regenerative potential after severe burns or trauma and their regeneration or functional recovery still faces many obstacles.In practice,restoring SG function requires not only the...Background:Sweat glands(SGs)have low regenerative potential after severe burns or trauma and their regeneration or functional recovery still faces many obstacles.In practice,restoring SG function requires not only the structural integrity of the gland itself,but also its neighboring tissues,especially blood vessels.Collagen triple helix repeat containing-1(CTHRC1)was first identified in vascular repair,and increasing reports showed a close correlation between cutaneous appendage specification,patterning and regeneration.The purpose of the present study was to clarify the role of CTHRC1 in SGs and their adjacent microvessels and find therapeutic strategies to restore SG function.Methods:The SGs and their adjacent microvascular network of Cthrc^(1−/−)mice were first inves-tigated using sweat test,laser Doppler imaging,tissue clearing technique and transcriptome analysis.The effects of CTHRC1 on dermal microvascular endothelial cells(DMECs)were further explored with cell proliferation,DiI-labeled acetylated low-density lipoprotein uptake,tube for-mation and intercellular junction establishment assays.The effects of CTHRC1 on SG function restoration were finally confirmed by replenishing the protein into the paws of Cthrc(1−/−)mice.Results:CTHRC1 is a key regulator of SG function in mice.At the tissue level,Cthrc1 deletion resulted in the disorder and reduction of the microvascular network around SGs.At the molecular level,the knockout of Cthrc1 reduced the expression of vascular development genes and functional proteins in the dermal tissues.Furthermore,CTHRC1 administration considerably enhanced SG function by inducing adjacent vascular network reconstruction.Conclusions:CTHRC1 promotes the development,morphogenesis and function execution of SGs and their neighboring vasculature.Our study provides a novel target for the restoration or regeneration of SG function in vivo.展开更多
文摘目的探讨外泌体转运miRNA-155靶向胶原三螺旋重复蛋白1(CTHRC1)对胃癌细胞腹膜种植转移的影响。方法提取胃癌BCG-823细胞外泌体并采用透射电子显微镜鉴定;实时荧光定量PCR检测胃癌BCG-823细胞和外泌体miRNA-155水平;激光共聚焦显微镜观察人腹膜间皮HMrSV5细胞对外泌体吞噬情况;设立阴性对照组、外泌体组和miRNA-155mimic组,通过划痕实验检测外泌体转运miRNA-155对腹膜间皮细胞HMrSV5迁移力的影响;利用生物信息预测软件结合荧光素酶报告基因检测验证miRNA-155的靶基因;Western blotting检测细胞CTHRC1蛋白表达。结果提取的外泌体呈现杯口状,直径40-150nm,外泌体标志性蛋白CD9、CD81呈阳性,而内质网分子伴侣Calnexin不表达;外泌体miRNA-155表达水平显著高于胃癌BCG-823细胞(P<0.05);采用PKH26对外泌体标记后在显微镜下呈红色,其主要分布在人腹膜间皮细胞HMrSV5的细胞质内,且视野下大部分细胞均可见红色荧光。利用生物分析软件(TargetScan,CLIP-Seq,miRDB and miRanda)预测了miRNA-155的下游靶基因为CTHRC1。与阴性对照组比较,外泌体组和miRNA-155mimic组腹膜间皮细胞迁移力、细胞增殖、细胞活力和细胞迁移显著增加,且miRNA-155mimic组高于外泌体组,其中外泌体中miRNA-155表达水平为0.49±0.03,CTHRC1蛋白表达水平显著降低,且miRNA-155mimic组低于外泌体组(P<0.05)。结论胃癌细胞来源的外泌体可促进腹膜间皮细胞迁移,因此增加肿瘤转移风险,其机制可能是外泌体内过表达的miRNA-155靶向抑制CTHRC1蛋白表达水平所引起。
基金supported by grants from the National Natural Science Foundation of China(81830064,81721092,32000969,82002056)Key Support Program for Growth Factor Research(SZYZ-TR-03)+3 种基金Chinese PLA General Hospital for Military Medical Innovation Research Project(CX-19026)the CAMS Innovation Fund for Medical Sciences(CIFMS,2019-I2M-5-059)the Military Medical Research and Development Projects(AWS17J005)Beijing Natural Science Foundation(7204306).
文摘Background:Sweat glands(SGs)have low regenerative potential after severe burns or trauma and their regeneration or functional recovery still faces many obstacles.In practice,restoring SG function requires not only the structural integrity of the gland itself,but also its neighboring tissues,especially blood vessels.Collagen triple helix repeat containing-1(CTHRC1)was first identified in vascular repair,and increasing reports showed a close correlation between cutaneous appendage specification,patterning and regeneration.The purpose of the present study was to clarify the role of CTHRC1 in SGs and their adjacent microvessels and find therapeutic strategies to restore SG function.Methods:The SGs and their adjacent microvascular network of Cthrc^(1−/−)mice were first inves-tigated using sweat test,laser Doppler imaging,tissue clearing technique and transcriptome analysis.The effects of CTHRC1 on dermal microvascular endothelial cells(DMECs)were further explored with cell proliferation,DiI-labeled acetylated low-density lipoprotein uptake,tube for-mation and intercellular junction establishment assays.The effects of CTHRC1 on SG function restoration were finally confirmed by replenishing the protein into the paws of Cthrc(1−/−)mice.Results:CTHRC1 is a key regulator of SG function in mice.At the tissue level,Cthrc1 deletion resulted in the disorder and reduction of the microvascular network around SGs.At the molecular level,the knockout of Cthrc1 reduced the expression of vascular development genes and functional proteins in the dermal tissues.Furthermore,CTHRC1 administration considerably enhanced SG function by inducing adjacent vascular network reconstruction.Conclusions:CTHRC1 promotes the development,morphogenesis and function execution of SGs and their neighboring vasculature.Our study provides a novel target for the restoration or regeneration of SG function in vivo.
