目的探讨β-环连蛋白抑制基因1(dapper antagonist of catenin-1,DACT1)对Ⅰ型上皮性卵巢癌迁移侵袭能力的影响及可能机制。方法免疫组织化学检测Ⅰ型人卵巢癌临床组织中DACT1的表达;采用人黏液性卵巢癌细胞株3AO构建外源性转染DACT1的...目的探讨β-环连蛋白抑制基因1(dapper antagonist of catenin-1,DACT1)对Ⅰ型上皮性卵巢癌迁移侵袭能力的影响及可能机制。方法免疫组织化学检测Ⅰ型人卵巢癌临床组织中DACT1的表达;采用人黏液性卵巢癌细胞株3AO构建外源性转染DACT1的稳转株,通过划痕实验、Transwell迁移及基质胶侵袭实验检测细胞运动能力;免疫荧光观察DACT1对细胞骨架重塑的影响。结果Ⅰ型卵巢癌组织中DACT1表达低于正常卵巢组织(P<0.01)。外源性转染DACT1后3AO细胞株迁移侵袭能力降低(P<0.01),且腹腔内成瘤能力有所下降,细胞骨架中特化膜结构减少。结论 DACT1对Ⅰ型卵巢癌浸润转移具有抑制效应,其在Ⅰ型卵巢癌组织中的低表达可能与其疾病发生相关。展开更多
Sensitive smell discrimination is based on structural plasticity of the olfactory bulb,which depends on migration and integration of newborn neurons from the subventricular zone.In this study,we examined the relations...Sensitive smell discrimination is based on structural plasticity of the olfactory bulb,which depends on migration and integration of newborn neurons from the subventricular zone.In this study,we examined the relationship between neural stem cell status in the subventricular zone and olfactory function in rats with diabetes mellitus.Streptozotocin was injected through the femoral vein to induce type 1 diabetes mellitus in Sprague-Dawley rats.Two months after injection,olfactory sensitivity was decreased in diabetic rats.Meanwhile,the number of Brd U-positive and Brd U＋/DCX＋double-labeled cells was lower in the subventricular zone of diabetic rats compared with agematched normal rats.Western blot results revealed downregulated expression of insulin receptorβ,phosphorylated glycogen synthase kinase 3β,and β-catenin in the subventricular zone of diabetic rats.Altogether,these results indicate that diabetes mellitus causes insulin deficiency,which negatively regulates glycogen synthase kinase 3β and enhances β-catenin degradation,with these changes inhibiting neural stem cell proliferation.Further,these signaling pathways affect proliferation and differentiation of neural stem cells in the subventricular zone.Dysfunction of subventricular zone neural stem cells causes a decline in olfactory bulb structural plasticity and impairs olfactory sensitivity in diabetic rats.展开更多
文摘目的探讨β-环连蛋白抑制基因1(dapper antagonist of catenin-1,DACT1)对Ⅰ型上皮性卵巢癌迁移侵袭能力的影响及可能机制。方法免疫组织化学检测Ⅰ型人卵巢癌临床组织中DACT1的表达;采用人黏液性卵巢癌细胞株3AO构建外源性转染DACT1的稳转株,通过划痕实验、Transwell迁移及基质胶侵袭实验检测细胞运动能力;免疫荧光观察DACT1对细胞骨架重塑的影响。结果Ⅰ型卵巢癌组织中DACT1表达低于正常卵巢组织(P<0.01)。外源性转染DACT1后3AO细胞株迁移侵袭能力降低(P<0.01),且腹腔内成瘤能力有所下降,细胞骨架中特化膜结构减少。结论 DACT1对Ⅰ型卵巢癌浸润转移具有抑制效应,其在Ⅰ型卵巢癌组织中的低表达可能与其疾病发生相关。
基金partly supported by the National Natural Science Foundation of China,No.81370448,81570725
文摘Sensitive smell discrimination is based on structural plasticity of the olfactory bulb,which depends on migration and integration of newborn neurons from the subventricular zone.In this study,we examined the relationship between neural stem cell status in the subventricular zone and olfactory function in rats with diabetes mellitus.Streptozotocin was injected through the femoral vein to induce type 1 diabetes mellitus in Sprague-Dawley rats.Two months after injection,olfactory sensitivity was decreased in diabetic rats.Meanwhile,the number of Brd U-positive and Brd U＋/DCX＋double-labeled cells was lower in the subventricular zone of diabetic rats compared with agematched normal rats.Western blot results revealed downregulated expression of insulin receptorβ,phosphorylated glycogen synthase kinase 3β,and β-catenin in the subventricular zone of diabetic rats.Altogether,these results indicate that diabetes mellitus causes insulin deficiency,which negatively regulates glycogen synthase kinase 3β and enhances β-catenin degradation,with these changes inhibiting neural stem cell proliferation.Further,these signaling pathways affect proliferation and differentiation of neural stem cells in the subventricular zone.Dysfunction of subventricular zone neural stem cells causes a decline in olfactory bulb structural plasticity and impairs olfactory sensitivity in diabetic rats.
文摘[目的]阐明转导素β1X连锁受体蛋白1 (transducin β-like 1 X-linked receptor 1,TBL1XR1)可介导上皮-间质转化和干细胞特性,从而调控头颈鳞癌细胞的迁移、侵袭。[方法]利用UALCAN数据库网站搜索TBL1XR1在头颈鳞癌组织及癌旁组织中的表达情况,应用Cbioprotal在线分析平台分析癌症基因组图集(The Cancer Genome Atlas,TCGA)数据库中523例头颈鳞癌RNA-SEQ数据。将慢病毒介导的TBL1XR1过表达载体、沉默载体和对应空白载体分别转染头颈鳞癌细胞Tu686。划痕愈合实验、Transwell迁移和侵袭实验评价Tu686细胞的迁移、侵袭能力;Western blot、qRT-PCR检测上皮-间质转化标志物表达;肿瘤球形成实验、qRT-PCR检测干细胞特性;抑制Wnt/β-catenin信号通路后检测TBL1XR1过表达引起的细胞迁移、侵袭、上皮-间质转化和干细胞特性。[结果] TBL1XR1 mRNA在头颈鳞癌组织中的表达明显高于相应癌旁组织(P<0.001)。过表达TBL1XR1的Tu686细胞划痕愈合能力(90%±4%vs 53%±6%)、Transwell迁移(0.68±0.04 vs 0.32±0.03)、侵袭能力(0.59±0.04 vs 0.26±0.04)较对照组显著性增强(P均<0.05)。TBL1XR1表达被抑制时,细胞划痕愈合能力(70%±4%vs 96%±5%)、Transwell迁移(0.32±0.06 vs 0.63±0.08)、侵袭能力(0.24±0.04 vs 0.52±0.05)较对照组显著性降低(P均<0.05)。TBL1XR1过表达后,Tu686细胞的间质细胞标志物Vimentin、N-cadherin表达升高,上皮细胞标志物E-cadherin表达降低;肿瘤球形成数较对照组明显增多(41±9 vs 13±4,P<0.05),肿瘤干细胞标志物ALDH1、CD44、CD133表达上调。抑制Wnt/β-catenin信号通路可部分逆转TBL1XR1过表达引起的迁移、侵袭、上皮-间质转化及干细胞特性改变。[结论] TBL1XR1可在体外介导上皮-间质转化和干细胞特性,进而促进头颈鳞癌细胞迁移、侵袭,其调控机制可能与Wnt/β-catenin信号通路相关。
