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目的观察Rho激酶抑制剂Y-27632对涎腺腺样囊性癌细胞肺高转移细胞株(ACC-M)生长增殖的影响,探讨Y-27632对涎腺腺样囊性癌可能疗效,以期为治疗涎腺腺样囊性癌提供新思路。方法 2007年10月至2008年2月在浙江大学医学实验室,形态学观察Rho激酶抑制剂Y-27632作用下ACC-M细胞的生长变化,并用四甲基偶氮唑蓝(MTT)比色法检测不同药物浓度下ACC-M的增殖情况。结果抑制剂Y-27632作用下ACC-M细胞变成梭形,细胞长轴增加,细胞间连接消失,细胞膜不规则,皱缩不整齐,边界有丝状突起,有倾向凋亡的趋势;MTT比色法检测结果发现,不同浓度Y-27632作用下检测到的ACC-M细胞光密度值均比对照组小,且当药物浓度为10μmol/L时抑制作用有统计学意义(P<0.01)。结论 Rho激酶抑制剂Y-27632在体外实验中对涎腺腺样囊性癌细胞的生长增殖起一定的抑制作用。     

EPO对人牙髓干细胞增殖及分化的影响

目的体外探究促红细胞生成素(EPO)对人牙髓干细胞(human dental pulp stem cells, hDPSCs)增殖及分化的影响。方法体外常规培养hDPSCs后,不同浓度EPO(0、0.1、1、10、20、50 U/ml)刺激hDPSCs,CCK-8法检测细胞增殖能力变化;采用碱性磷酸酶(ALP)染色及活性测定、茜素红染色、Real-time PCR来研究EPO对hDPSCs分化的影响。结果 10U/ml EPO可以促进hDPSCs的增殖(P<0.05);20U/ml EPO组碱性磷酸酶染色加深,活性提高,钙化结节形成增多;成血管成牙成骨向分化相关基因VEGF、bFGF、DSPP、Runx2、ALP的表达上调(P<0.05)。结论适宜浓度的EPO可以促进hDPSCs的增殖及分化。     

牙本质非胶原蛋白对人牙髓干细胞增殖活性及矿化能力的影响

目的：明确牙本质非胶原蛋白（dentin non—collagenous proteins,dNCPs）对人牙髓干细胞（human dental pulp stemcells,hDPSCs）增殖及矿化能力的影响。方法：通过细胞活性噻唑蓝（MTT）比色法、碱性磷酸酶（ALP）活性检测、茜素红钙化结节染色和氯代十六烷基吡啶定量分析钙离子浓度,检测10¨g／mLdNCPs对hDPSCs增殖和矿化能力的影响。结果：dNCPs分别诱导1、3、5、7、9d,人牙髓干细胞增殖活性与对照组相比无显著性差异（P〉0．05）;诱导3、5、7d时,人牙髓干细胞ALP活性明显上调,与对照组相比有统计学差异（P〈0．01）;诱导2周后,茜素红染色显示10μg／mLdNCPs组出现较大钙化结节,定量分析显示,其形成钙化结节的能力明显高于对照组（P〈0．001）。结论：10μ∥mLdNCPs可明显促进人牙髓干细胞的矿化能力,对其增殖活性的影响则不明显。     

瘦素对人牙髓干细胞增殖及分化的影响

目的 探讨瘦素(leptin)对体外培养的牙髓干细胞增殖、分化的影响.方法 体外培养牙髓干细胞,采用MTT法及流式细胞技术检测不同浓度瘦素对牙髓干细胞增殖作用的影响,通过碱性磷酸酶、Yon Kossa染色及矿化相关蛋白(DSP、OCN)的免疫组化染色来检测瘦素对牙髓干细胞分化的影响.结果 瘦素对牙髓干细胞增殖没有显著作用,但是对牙髓干细胞的ALP活性呈浓度依赖性促进.Von Kossa染色可见矿化结节形成,DSP及OCN表达阳性.结论 瘦素可促进牙髓干细胞向成牙本质细胞分化.     

沉默N-cadherin对人牙髓干细胞增殖和迁移能力的影响

目的探讨沉默N-cadherin对人牙髓干细胞（dental pulp stem cells,DPSCs）增殖和迁移能力的影响,为基于DPSCs的牙髓再生提供实验依据。方法采用N-cadherin sh RNA慢病毒转染DPSCs,q RT-PCR、Western blot检测N-cadherin的表达水平,验证沉默效率。实验分为阴性对照组（sh RNA-NC）和N-cadherin sh RNA沉默组。采用CCK-8法检测细胞增殖能力,流式细胞术检测细胞周期和细胞凋亡情况,Transwell法检测细胞迁移能力。结果N-cadherin sh RNA可显著降低DPSCs的N-cadherin m RNA和蛋白的表达水平（P<0.001）。N-cadherin sh RNA组细胞增殖活性分别在细胞接种的第3、4天高于sh RNA-NC组,第6～8天低于sh RNA-NC组,差异均具有统计学意义（P<0.05）;在第3天时,N-cadherin sh RNA组处于S期和G2期的细胞比例大于sh RNA-NC组（P<0.05）;在第6天时,N-cadherin sh RNA...     

Satb2过表达对牙髓干细胞增殖和迁移能力的影响

目的:通过慢病毒介导Satb2(special AT-rich binding protein 2,Satb2)感染人牙髓干细胞(human Dental pulp stem cells,hDPSCs),观察Satb2过表达对人牙髓干细胞迁移和增殖能力的影响。方法:构建Satb2过表达慢病毒感染人牙髓干细胞,通过筛选得到稳定过表达Satb2细胞克隆。CCK8实验检测过表达Satb2对人牙髓干细胞的增殖能力的影响。划痕实验和Transwell细胞迁移实验观察细胞迁移能力的变化。免疫荧光染色观察细胞骨架微管的变化。结果:过表达Satb2的人牙髓干细胞相比对照组增殖能力增强(P＜0.05),微管更粗大,细胞的迁移能力增强。结论:过表达Satb2能使人牙髓干细胞的增殖和迁移能力增强。     

模拟微重力环境对人牙髓干细胞体内增殖能力的影响

目的：研究模拟微重力环境对聚乳酸-羟基乙酸（PLGA）支架上人牙髓干细胞（hDPSCs）体内增殖能力的影响。方法：分离、培养hDPSCs并进行鉴定。以PLGA作为支架材料培养人牙髓干细胞,将hDPSCs-PLGA复合物分别在模拟微重力环境和普通重力环境下培养72h,然后移植到裸鼠背部皮下。植入4周后取出组织块,分别进行HE染色、Masson染色、Ki67和I型胶原免疫组化检测。结果：模拟微重力环境下细胞密度、胶原生成量、I型胶原表达量和Ki67阳性细胞数量明显高于普通环境（P〈0.01）。结论：模拟微重力环境培养的hDPSCs的体内增殖能力高于普通重力组。     

miR-103对牙髓干细胞增殖及其向成牙本质细胞分化的影响

目的:探讨miR-103对牙髓干细胞向成牙本质细胞分化的影响.方法:从即刻拔除的成入第三磨牙中分离培养人牙髓干细胞,将培养的细胞分为对照组、miRNA阴性对照组、miR-103过表达组和miR-103降低表达组,利用CCK-8法检测人牙髓细胞的增殖能力变化,利用q-PCR和Western Bolt技术检测人牙髓细胞中R...     

bFGF、TGF-β对人牙髓干细胞增殖和分化能力的影响

目的：探讨bFGF和TGF-β对体外培养的人牙髓f细胞增殖和分化能力的影响。方法：采用MTT法分别测定了bFGF和TGF-β作用不同浓度、不同时间单独或联合作用对人牙髓干细胞增殖能力的影响。通过碱性磷酸酶活性检测、细胞形态学观察及DSP、DMP-1免疫组化染色来检测这两种因子对人牙髓十细胞分化能力的影响。结果：0～40ng／mL范围内，bFGF单独作用能显著促进人牙髓干细胞的增殖，EL具有浓度和时间依赖性，而TGF～8促增殖作用较弱；两肯联合作用，促增殖作用无显著提高，而促分化作用显著增强，不仪细胞形态明显改变，而且碱性磷酸酶活性显著提高，DSP、DMP-1呈阳性表达，向成牙本质细胞样细胞分化。结论：bFGF和TG-β对体外培养的人牙髓干细胞增殖和分化具有重要作用，为对探讨影响人牙髓干细胞增殖和分化的因素提供参考依据。     

模拟微重力环境对人牙髓干细胞体外增殖能力的影响

目的：研究模拟微重力环境对人牙髓干细胞（human dental pulp stem cells,hDPSCs）在PLGA支架上体外增殖能力的影响。方法：将分离、鉴定后的人牙髓干细胞接种在PLGA支架上,采用MTT法检测普通环境和模拟微重力环境中培养24、48、72h的人牙髓干细胞在PLGA支架上的细胞活性。DAPI荧光染色和流式细胞术比较牙髓干细胞在两种环境培养3d的细胞数量以及细胞周期分布情况。结果：MTT显示模拟微重力组中各时间点的A值均高于普通环境培养组;DAPI荧光染色显示在模拟微重力下培养3d的人牙髓干细胞数量明显多于普通环境培养组;细胞周期分析结果表明模拟微重力组中S期细胞比例明显高于普通环境培养组（P〈0.05）。结论：接种在PLGA支架上的人牙髓干细胞在模拟微重力环境下较普通环境具有更高的体外增殖能力。     

人牙髓干细胞在聚乳酸-聚乙醇酸共聚物支架上粘附与增殖的研究

目的：研究成人牙髓干细胞（HDPSCs）在聚乳酸-聚乙醇酸共聚物（PLGA）支架上粘附与增殖的情况。方法：采用酶消化法分离、培养人牙髓干细胞,免疫组化法及体外诱导分化对细胞进行鉴定。将人牙髓干细胞与PLGA支架材料进行复合培养,扫描电镜（SEM）观察支架材料形态,细胞粘附、增殖及基质分泌情况;细胞计数检测其增殖力。结果：细胞接种2、5、10d,扫描电镜及细胞计数均显示HDPSCs与PLGA支架材料粘附紧密,生长状态良好,细胞明显增殖（P〈0.05）,有丰富的细胞外基质形成。结论：PLGA是一种适宜人牙髓干细胞粘附与增殖的支架材料。     

凝胶样支架材料对三维培养的人牙髓干细胞增殖的影响

目的　评价牙髓组织工程中不同浓度的两种可注射性凝胶样支架材料对牙髓干细胞增殖的影响。方法：配制不同浓度的I型胶原、肽段水凝胶（Puramatrix）支架材料,将牙髓干细胞分别接种于各组支架材料上;CCK-8方法检测细胞增殖情况;活死细胞染色观察细胞数量及形态。 结果　接种在各浓度支架材料上的牙髓干细胞均生长良好,其中1%的胶原支架和0.25%的水凝胶支架对牙髓干细胞的增殖有明显的促进作用;活死细胞染色观察牙髓干细胞在各浓度的两种支架材料中均生长良好,细胞数量随培养时间的延长呈递增趋势;细胞充分伸展,呈纺锤型。     

人牙髓干细胞的体外培养和鉴定

目的　研究第三恒磨牙来源的人牙髓干细胞的表型和生物学性状。方法　从成人健康阻生牙中获取牙髓,酶消化法分离获得牙髓干细胞,计算细胞克隆形成率(CFU-F);免疫组化、RT-PCR法检测细胞的表面分子表达; 流式细胞仪测定细胞周期;体外分化诱导实验检测细胞的多向分化能力。结果　分离获得的牙髓干细胞在体外具有一定的克隆形成能力,诱导条件下部分牙髓干细胞可向脂肪、肌细胞和成牙本质细胞方向分化,符合干细胞的特征。结论　成功的从人第三恒磨牙牙髓中分离得到牙髓干细胞。     

The Role of Small Extracellular Vesicles Derived from Lipopolysaccharide-preconditioned Human Dental Pulp Stem Cells in Dental Pulp Regeneration

IntroductionRegenerative endodontics has created a desirable shift in the treatment paradigm despite current limitations of regenerative outcomes. Mesenchymal stem cells (MSCs) facilitate tissue regeneration and repair in a mild inflammatory environment. Small extracellular vesicles (sEVs) derived from MSCs play an imperative role in the paracrine modulation of regenerative responses modulated by MSCs. However, it remains unknown whether MSCs enhance dental pulp regeneration or whether this enhancement is mediated by sEVs in a mild inflammatory environment. The present study aimed to elucidate the effects of sEVs originated from lipopolysaccharide (LPS)-preconditioned human dental pulp stem cells (hDPSCs) on dental pulp regeneration.MethodsAll sEVs were isolated from hDPSCs cultured with or without LPS (ie, N-sEVs and L-sEVs, respectively). The effect of N-sEVs and L-sEVs on proliferation, migration, angiogenesis, and differentiation of rat bone marrow MSCs was identified in vitro. Moreover, N-sEVs or L-sEVs were implanted into rat pulpless root canal models, and the regenerated tissue in root canals was assessed via hematoxylin-eosin staining, Masson staining, and immunohistochemistry after 30 days of transplantation.ResultsBoth N-sEVs and L-sEVs could modulate BMSC proliferation, migration, angiogenesis, and differentiation. Both kinds of sEVs enhanced the structure of the regenerated tissue closer to that of a normal dental pulp in vivo. L-sEVs had a more significant effect than N-sEVs.ConclusionssEVs released by hDPSCs in a mild inflammatory microenvironment are capable of facilitating the regeneration of dental pulp through functional healing instead of scar healing, which has potential applications in regenerative endodontics.     

模拟微重力对人牙髓干细胞在裸鼠体内矿化能力的影响

目的:研究模拟微重力环境对聚乳酸-羟基乙酸(PLGA)支架上的人牙髓干细胞(human dental pulp stem cells, hDPSCs)在裸鼠体内矿化能力的影响。方法:分离、培养hDPSCs并进行鉴定,然后将hDPSCs接种到PLGA支架上培养72 h后随机分为两组,普通重力组和模拟微重力组,经矿化诱导液培养1周后分别将细胞支架复合物移植到裸鼠体内,植入术后4周取材,进行组织学(HE和Vonkossa)和免疫组织化学(DSPP)检测。结果:HE染色均可见有血管生成,Vonkossa染色均为阳性,模拟微重力组DSPP的表达水平明显高于普通重力组(P<0.05)。结论:模拟微重力有利于hDPSCs在裸鼠体内的矿化。     

The Effect of Octenidine on Proliferation,Migration, and Osteogenic Differentiation of Human Dental Pulp and Apical Papilla Stem Cells

IntroductionThe research for alternative irrigating solutions is ongoing, since no “ideal” solution has yet been found. Octenidine dihydrochloride (OCT) has been indicated as an endodontic irrigant because it has adequate antimicrobial and biological properties. The present study aimed to assess the effects of OCT on proliferation, migration, and induction of the osteogenic phenotype of stem cells from human dental pulp and apical papilla.MethodsCells were collected from human third molars and exposed to different doses of OCT, chlorhexidine (CHX), sodium hypochlorite (NaOCl), and ethylenediaminetetraacetic acid (EDTA) to determine cell viability by alamarBlue assay; proliferation by bromodeoxyuridine incorporation; migration by the Transwell assay; alkaline phosphatase activity by thymolphthalein release; and production of mineralized nodules by alizarin red staining. The results were analyzed by 1- or 2-way analysis of variance and Tukey (α = .05).ResultsCHX promoted lower cell viability, followed by OCT, NaOCl, and EDTA, especially at intermediate doses (P < .05). Cells exposed to CHX had less proliferation than the other groups (P < .05). The Transwell assay revealed no differences among OCT, EDTA, and culture medium (control group) (P > .05). OCT and EDTA induced greater migration than CHX and NaOCl (P < .05). OCT and EDTA induced higher alkaline phosphatase activity than NaOCl and CHX (P < .05). No difference was detected among the groups using alizarin red staining (P > .05).ConclusionsOCT induced high migration, proliferation, and alkaline phosphatase activity of stem cells from human dental pulp and apical papilla, which could be advantageous for regenerative endodontic procedures.     

Mesenchymal Stem Cells Derived from Human Inflamed Dental Pulp Exhibit Impaired Immunomodulatory Capacity In Vitro

IntroductionDental pulp stem cells (DPSC) are very attractive in regenerative medicine. In this study, we focused on the characterization of the functional properties of mesenchymal stem cells derived from DPSCs. Currently, it is unknown whether inflammatory conditions present in an inflamed dental pulp tissue could alter the immunomodulatory properties of DPSCs. This study aimed to evaluate the immunomodulatory capacity in vitro of DPSCs derived from healthy and inflamed dental pulp.MethodsDPSCs from 10 healthy and inflamed dental pulps (irreversible pulpitis) were characterized according to the minimal criteria of the International Society for Cell Therapy, proliferation, differential potential, and colony-forming units. Furthermore, the immunomodulatory capacity of DPSCs was tested on the proliferation of T lymphocytes by flow cytometry and the in vitro enzyme activity of indoleamine 2, 3-dioxygenase.ResultsThere were no significant differences in the DPSC characteristics and properties such as immunophenotype, tridifferentiation, colony-forming units, and proliferation of the DPSCs derived from normal and inflamed pulp tissue. Furthermore, there were significant differences in the immunomodulatory capacity of DPSCs obtained from human healthy dental pulp and with the diagnosis of irreversible pulpitis.ConclusionsOur results showed that DPSCs isolated from inflamed dental pulp showed typical characteristics of MSCs and diminished immunosuppressive capacity in vitro in comparison with MSCs derived from healthy dental pulp. Further investigation in vivo is needed to clarify the mechanism of this diminished immunosuppressive capacity.