Expansion of human umbilical cord derived mesenchymal stem cells in regenerative medicine

BACKGROUND Stem cells are undifferentiated cells that possess the potential for self-renewal with the capacity to differentiate into multiple lineages.In humans,their limited numbers pose a challenge in fulfilling the necessary demands for the regeneration and repair of damaged tissues or organs.Studies suggested that mesenchymal stem cells(MSCs),necessary for repair and regeneration via transplantation,require doses ranging from 10 to 400 million cells.Furthermore,the limited expansion of MSCs restricts their therapeutic application.AIM To optimize a novel protocol to achieve qualitative and quantitative expansion of MSCs to reach the targeted number of cells for cellular transplantation and minimize the limitations in stem cell therapy protocols.METHODS Human umbilical cord(hUC)tissue derived MSCs were obtained and re-cultured.These cultured cells were subjected to the following evaluation pro-cedures:Immunophenotyping,immunocytochemical staining,trilineage differentiation,population doubling time and number,gene expression markers for proliferation,cell cycle progression,senescence-associatedβ-galactosidase assay,human telomerase reverse transcriptase(hTERT)expression,mycoplasma,cytomegalovirus and endotoxin detection.RESULTS Analysis of pluripotent gene markers Oct4,Sox2,and Nanog in recultured hUC-MSC revealed no significant differences.The immunophenotypic markers CD90,CD73,CD105,CD44,vimentin,CD29,Stro-1,and Lin28 were positively expressed by these recultured expanded MSCs,and were found negative for CD34,CD11b,CD19,CD45,and HLA-DR.The recultured hUC-MSC population continued to expand through passage 15.Proliferative gene expression of Pax6,BMP2,and TGFb1 showed no significant variation between recultured hUC-MSC groups.Nevertheless,a significant increase(P<0.001)in the mitotic phase of the cell cycle was observed in recultured hUC-MSCs.Cellular senescence markers(hTERT expression andβ-galactosidase activity)did not show any negative effect on recultured hUC-MSCs.Additionally,quality control assessments consistently confirmed the absence of mycoplasma,cytomegalovirus,and endotoxin contamination.CONCLUSION This study proposes the development of a novel protocol for efficiently expanding stem cell population.This would address the growing demand for larger stem cell doses needed for cellular transplantation and will significantly improve the feasibility of stem cell based therapies.

Zinc enhances the cell adhesion,migration,and self-renewal potential of human umbilical cord derived mesenchymal stem cells

BACKGROUND Zinc(Zn)is the second most abundant trace element after Fe,present in the human body.It is frequently reported in association with cell growth and proliferation,and its deficiency is considered to be a major disease contributing factor.AIM To determine the effect of Zn on in vitro growth and proliferation of human umbilical cord(hUC)-derived mesenchymal stem cells(MSCs).METHODS hUC-MSCs were isolated from human umbilical cord tissue and characterized based on immunocytochemistry,immunophenotyping,and tri-lineage differentiation.The impact of Zn on cytotoxicity and proliferation was determined by MTT and Alamar blue assay.To determine the effect of Zn on population doubling time(PDT),hUC-MSCs were cultured in media with and without Zn for several passages.An in vitro scratch assay was performed to analyze the effect of Zn on the wound healing and migration capability of hUC-MSCs.A cell adhesion assay was used to test the surface adhesiveness of hUC-MSCs.Transcriptional analysis of genes involved in the cell cycle,proliferation,migration,and selfrenewal of hUC-MSCs was performed by quantitative real-time polymerase chain reaction.The protein expression of Lin28,a pluripotency marker,was analyzed by immunocytochemistry.RESULTS Zn at lower concentrations enhanced the rate of proliferation but at higher concentrations(>100μM),showed concentration dependent cytotoxicity in hUC-MSCs.hUC-MSCs treated with Zn exhibited a significantly greater healing and migration rate compared to untreated cells.Zn also increased the cell adhesion rate,and colony forming efficiency(CFE).In addition,Zn upregulated the expression of genes involved in the cell cycle(CDC20,CDK1,CCNA2,CDCA2),proliferation(transforming growth factorβ1,GDF5,hypoxia-inducible factor 1α),migration(CXCR4,VCAM1,VEGF-A),and self-renewal(OCT4,SOX2,NANOG)of hUC-MSCs.Expression of Lin28 protein was significantly increased in cells treated with Zn.CONCLUSION Our findings suggest that zinc enhances the proliferation rate of hUC-MSCs decreasing the PDT,and maintaining the CFE.Zn also enhances the cell adhesion,migration,and self-renewal of hUC-MSCs.These results highlight the essential role of Zn in cell growth and development.

Effects of miR-21 antisense oligonucleotides on proliferation,migration and autophagy of human umbilical vein endothelial cells

Objective:To investigate the effects of microRNA-21 antisense nucleotide(AS-miR-21)on the proliferation,migration and autophagy of human umbilical vein endothelial cells(HUVECs).Methods:HUVECs were treated with1,000 nmol/L rapamycin for 6 h(rapamycin group)or ASmiR-21 transfection followed by 1,000 nmol/L rapamycin for6 h(AS-miR-21+rapamycin group).HUVECs without any treatment were defined as control group.The proliferation and migration abilities of HUVECs were detected by methyl thiazolyl tetrazolium(MTT)assay,scratch wound healing assay and transwell test,respectively.The expressions of microtubule-associated protein light chain 3 Ⅱ/Ⅰ(LC3 Ⅱ/Ⅰ)and Becline-1 were determined by western blotting.Results:The rapamycin group showed decreased OD value and migration rate,an increased ratio of LC3 Ⅱ/Ⅰ and up-regulated expression of Beclin-1 compared with the control group(P<0.05).The AS-miR-21+rapamycin group demonstrated lower OD value,migration rate,the number of migrated cells,and significantly higher ratio of LC3 Ⅱ/Ⅰ and Beclin-1 protein expression level than the control group and the rapamycin group(P<0.05).Conclusion:AS-miR-21 suppressed the autophagy,proliferation and migration in the HUVECs model of autophagy induced by rapamycin.

Influence of bone morphogenetic proteins-2 and strontium chloride on the human umbilical cord mesenchymal stem cells proliferation and osteogenic differentiation

Objective To study the effects of combination of bone morphogenetic protein-2 (BMP-2) and strontium chloride on proliferation and osteogenic differentiation of human umbilical cord mesenchymal stem cells(hUCM-SCs)in vitro culture.

Hyperoside Suppresses Lipopolysaccharide-induced Inflammation and Apoptosis in Human Umbilical Vein Endothelial Cells

Finding the novel drug from the effective components of traditional Chinese herbal medicine is a hotspot of the modem pharmacological research. Hyperoside （HYP） belongs to flavonoid glycosides, and it has various properties, such as anti-inflammation, anti-spasm, anti-diuretic, antitussive, lowering blood pressure, and lowering cholesterol effects as well as protective effects for the cardiac and cerebral blood vessels. The purpose of this study was to investigate the effects of HYP on inflammatory and apoptotic responses in vascular endothelial cells stimulated by lipopolysaccharide （LPS） and further to identify the possible mechanisms underlying these effects. In our study, human umbilical vein endothelial cells （HUVECs） were stimulated with 1 Bg/mL LPS in the presence or absence of HYP （10, 20 and 50 μmol/L）. Our results indicated that HYP alone exerted no cytotoxicity on HUVECs, while it had an upregulatory effect on the viability of HUVECs induced by LPS in a dose-dependent manner; increased mRNA expression of IL-1β, IL-6, TNFα and iNOS induced by LPS was attenuated after treatment with HYP both in a dose- and time-dependent manner; LPS-induced HUVECs apoptosis and cleaved-caspase 8, 9, 3 were all significantly reduced by HYP. Furthermore, the possible pathway involved in apoptosis and inflammation by HYP was detected, and the results showed that when treated with HYP, LPS-induced mitochondrial membrane instability was significantly inhibited through up-regulation of Bcl-2 and down-regulation of Bax. Furthermore, the expression of TLR4 and the phosphorylation of IκBα and p65 in LPS-treated cells were blocked by HYP. Our results suggested that HYP treatment prevented HUVECs from LPS- induced inflammation and apoptosis responses, which might be mediated by inhibiting TLR4/ NFκB pathway.

Damaging Effect of Cigarette Smoke Extract on PrimaryCultured Human Umbilical Vein Endothelial Cells and Its Mechanism

Objective To investigate the cellular effects of cigarette smoke extract (CSE) on primarily cultured human umbilical vein endothelial cells (HUVEC). Methods The effects of CSE (5%-20%) and nicotine (10-4 mol/L) on HUVEC viability, proliferation, angiogenesis and apoptosis were observed. Results CSE decreased HUVEC survival rate and angiogenesis after 24 h as well as its proliferation after 48 h in a dose-dependent manner. Moreover, CSE induced apoptosis of HUVEC as indicated in condensation of nuclear chromatin and the presence of hypodiploid DNA. HUVEC incubated with CSE for 24 h gave a significant decrease in the expression of Bcl-2 as well as the decline in the Bcl-2/Bax ratio accompanied with the loss of mitochondrial membrane potential and excess cytosolic calcium. Our study also observed that p53 protein level decreased, rather than increased in cells treated with CSE. Nicotine had no discernible inhibitory effects on the above indices of HUVEC. Conclusion Exposure to CSE other than nicotine causes inhibition of viability, proliferation and differentiation of HUVEC. CSE-induced HUVEC injury is mediated in part through accelerated apoptosis but independent of p53 pathway. It appears that mitochondria have played a key role in the apoptosis of HUVEC induced by CSE.

miR-145-5p在原发性高血压患者血清中的表达及其对人脐静脉内皮细胞增殖和凋亡的影响

目的探究miR-145-5p在原发性高血压(EH)患者血清中的表达及对人脐静脉内皮细胞(HUVEC)增殖和凋亡的影响。方法以2019年1月至2022年3月于山西医科大学汾阳学院就诊的160例EH患者及160例同期体检正常者为研究对象,RT-qPCR检测EH患者及同期体检正常者血清中的miR-145-5p表达水平。体外培养HUVEC,将之分为对照组、miR-145-5p mimic组、mimic-NC组、miR-145-5p inhibitor及inhibitor-NC组,CCK-8法检测各组HUVEC增殖情况;AnnexinV-FITC/PI双染法检测各组HUVEC凋亡情况;Western blot检测各组HUVEC增殖、凋亡相关蛋白[增殖细胞核抗原(PCNA)、细胞周期蛋白D1(Cyclin D1)、B细胞淋巴瘤/白血病基因-2相关X蛋白(Bax)、半胱氨酸天冬氨酸特异性蛋白酶-3(Caspase-3)]表达情况。结果miR-145-5p在EH患者血清中的表达水平明显低于体检正常者(P<0.05);与对照组、mimic-NC组比较,miR-145-5p mimic组HUVEC细胞增殖率及PCNA、Cyclin D1蛋白表达均增加,早期凋亡率、晚期凋亡率及Bax、Caspase-3蛋白表达均减少(P<0.05);与对照组、inhibitor-NC组比较,miR-145-5p inhibitor组HUVEC细胞增殖率及PCNA、Cyclin D1蛋白表达均减少(P<0.05),早期凋亡率、晚期凋亡率及Bax、Caspase-3蛋白表达均增加(P<0.05)。结论miR-145-5p在EH患者血清中呈低表达,过表达miR-145-5p可促进HUVEC增殖并抑制其凋亡。

微电场对人脐带间充质干细胞增殖和成骨分化的影响

背景:电刺激是一种可用于诱导细胞增殖、分化、凋亡等各种细胞活动的物理方法,诱导干细胞成骨分化将有利于骨的再生。目的:观察微电场是否可以促进人脐带间充质干细胞的增殖与成骨分化。方法:从人新鲜脐带组织获取脐带间充质干细胞,待细胞培养传代至第3代接种于6孔板内,24 h后分别给予0,50,100 mV/mm微电场刺激,刺激频率为每天1 h,连续刺激3 d,然后用显微镜观察细胞生长情况与形态变化,CCK-8和EdU染色法检测细胞的增殖情况,茜素红染色检测细胞的成骨分化能力,Western blot检测ERK通路蛋白的表达水平。结果与结论:①50,100 mV/mm组人脐带间充质干细胞的吸光度值和增殖细胞数目显著高于未刺激组(P<0.05);②微电场刺激前后人脐带间充质干细胞均能诱导分化为骨细胞,但50,100 mV/mm组的成骨分化速度比未刺激组快;③50,100 mV/mm组的p-ERK1/2蛋白表达高于未刺激组,且100 mV/mm组与未刺激组比较差异有显著性意义(P<0.05);④微电场促进人脐带间充质干细胞增殖的机制可能是通过促进ERK的磷酸化实现的。

幽门螺杆菌感染所致人脐静脉内皮细胞功能异常及炎性反应的作用机制研究

目的探讨幽门螺杆菌(Helicobacter pylori,Hp)通过激活转录激活因子3(STAT3)/核转录因子κB(NF-κB)通路对人脐静脉内皮细胞(human umbilical vein endothelial cell,HUVEC)增殖、迁移、凋亡及炎性反应的影响。方法将HUVEC分为对照组(未感染Hp)和Hp感染组(Hp感染复数=25),通过倒置显微镜观察感染Hp的HUVEC形态变化;细胞计数试剂盒8细胞增殖实验和平板克隆实验检测2组HUVEC增殖能力,Transwell实验和划痕愈合实验检测HUVEC的迁移能力,流式细胞术检测HUVEC的凋亡率,实时荧光定量聚合酶链反应检测2组HUVEC中Hp细胞毒素相关基因A、白细胞介素(IL)-6、IL-8、IL-1β和肿瘤坏死因子α(TNF-α)信使核糖核酸表达情况;Western blot检测HUVEC细胞周期蛋白D1(CyclinD1)、原癌基因(C-Myc)、基质金属蛋白酶(matrix metalloproteinase,MMP)-2、MMP-9、增殖细胞核抗原(proliferating cell nuclear antigen,PCNA)、B淋巴细胞瘤2基因(B-cell lymphoma-2,Bcl-2)、Bcl-2相关x蛋白(Bax)、STAT3/NF-κB信号通路蛋白表达情况。结果与对照组比较,Hp组细胞增殖、纵向、横向迁移能力明显降低,CyclinD1、PCNA、C-Myc、MMP-2、MMP-9、Bcl-2蛋白表达量降低,Bax、磷酸化STAT3/STAT3、磷酸化NF-κB P65/NF-κB-P65蛋白表达量和HUVEC凋亡率升高(P<0.05,P<0.01),炎性因子IL-6、IL-8、IL-1β、TNF-αmRNA水平升高(2.71±0.05 vs 1.06±0.41,1.42±0.02 vs 0.92±0.11,2.50±0.29 vs 1.00±0.10,5.34±0.57 vs 1.00±0.16,P<0.01)。结论Hp通过激活STAT3/NF-κB通路抑制HUVEC增殖、迁移,并诱导其凋亡和炎性反应的发生。

白细胞介素10工程化修饰人脐带间充质干细胞优效治疗炎症性肠病

背景:间充质干细胞来源广泛、易体外增殖,并可分泌一系列免疫调节因子抑制炎症、促进组织修复再生,广泛应用于各种疾病治疗研究。但是对于多种疾病,间充质干细胞的治疗效果有限。针对疾病特定发病机制或者干预靶点进行工程化修饰间充质干细胞是未来细胞治疗的重要发展方向。目的:白细胞介素10是一种典型的抗炎细胞因子,有助于调节免疫反应并诱导巨噬细胞向抗炎表型极化,该研究探讨白细胞介素10基因工程化修饰人脐带间充质干细胞对炎症性肠病的治疗效果。方法:通过电转染建立稳定过表达人白细胞介素10基因的人脐带间充质干细胞,并基于细胞治疗产品标准筛选出临床级细胞。给予C57BL/6J小鼠自由饮用5%葡聚糖硫酸钠盐水溶液建立急性结肠炎模型,分别在造模前1 d(尾静脉途径)与造模后第4天(腹腔途径)注射空质粒转染的人脐带间充质干细胞或过表达人白细胞介素10基因的人脐带间充质干细胞(1×10~6个/只)。在造模后第6天取结肠组织进行苏木精-伊红染色评估组织学变化,免疫荧光染色检测增殖细胞核抗原与CD31的表达。结果与结论:构建的稳定过表达白细胞介素10的工程化人脐带间充质干细胞,满足临床级人脐带间充质干细胞质量标准;人脐带间充质干细胞对小鼠急性结肠炎具有修复效果,过表达白细胞介素10基因的人脐带间充质干细胞的治疗效果更加优效,更显著地抑制急性结肠炎小鼠的体质量下降(P<0.05)、结肠缩短(P<0.05)以及结肠组织损伤(P<0.05);过表达白细胞介素10基因人脐带间充质干细胞组结肠组织切片中增殖细胞核抗原阳性细胞与CD31阳性细胞显著多于人脐带间充质干细胞组,表明过表达白细胞介素10基因的人脐带间充质干细胞可能通过显著促进肠组织细胞增殖和血管再生进而促进结肠组织修复。

miR-26b对人脱落乳牙牙髓干细胞及人脐带间充质干细胞增殖、迁移和成骨分化的影响

背景:microRNA-26b(miR-26b)对干细胞的多种功能具有重要的调节作用,但其对人脱落乳牙牙髓干细胞和人脐带间充质干细胞生物学特性的影响尚不清楚。目的:探讨miR-26b对人脱落乳牙牙髓干细胞和人脐带间充质干细胞增殖、迁移和成骨分化的影响。方法:培养及鉴定人脱落乳牙牙髓干细胞和人脐带间充质干细胞;用miR-26 mimics(实验组)和miRNAs mimics对照(对照组)转染2种细胞,构建过表达模型用于后续实验。CCK-8法检测过表达miR-26b细胞的增殖能力;Transwell和划痕实验分析过表达miR-26b细胞的迁移能力;RT-qPCR法检测过表达miR-26b细胞成骨诱导后成骨标志物的表达。结果与结论:①转染miR-26b模拟物可提高2种细胞中miR-26b表达量,促进人脱落乳牙牙髓干细胞增殖,对人脐带间充质干细胞的扩增无明显影响;②相较于对照组,2种细胞过表达miR-26b后迁移能力增强;③miR-26b在2种细胞成骨分化过程中表达水平降低;④相较于对照组,2种细胞过表达miR-26b后,成骨相关基因骨钙素、骨桥素、碱性磷酸酶、Ⅰ型胶原蛋白mRNA水平均下调。结果表明,过表达miR-26b能促进人脱落乳牙牙髓干细胞增殖、迁移,抑制其成骨分化;也促进人脐带间充质干细胞迁移,抑制其成骨分化,但对其增殖无明显影响。

KIF2C对肝细胞癌细胞恶性生物学行为和人脐静脉内皮细胞血管生成的影响

目的:探究驱动蛋白-13家族2C(KIF2C)对肝细胞癌(HCC)细胞增殖、侵袭和迁移以及人脐静脉内皮细胞(HUVEC)血管生成的影响,为HCC治疗提供潜在靶点。方法:用数据库数据分析KIF2C mRNA和蛋白在HCC组织中的表达及其与血管生成相关因子(VEGFR2和HIF-1α)表达的相关性,常规培养人正常肝细胞QSG-7701、HUVEC和HCC细胞Huh-7、Hep3B2.1-7,用Lipofectamine 3000转染试剂将sh-NC和sh-KIF2C转染至Huh-7、Hep3B2.1-7细胞,qPCR检测各组QSG-7701、Huh-7和Hep3B2.1-7细胞中KIF2C mRNA的表达,WB法检测各组细胞中KIF2C蛋白的表达,细胞克隆形成实验检测敲低KIF2C对Hep3B2.1-7和Huh-7细胞克隆形成的影响,小管生成实验检测敲低KIF2C表达的Huh-7和Hep3B2.1-7细胞的条件培养液对HUVEC血管生成能力的影响。结果:数据库分析结果显示,KIF2C mRNA和蛋白在HCC组织中均呈高表达(均P<0.01),用qPCR和WB法检测人HCC中KIF2C mRNA和蛋白的表达水平,结果显示其mRNA和蛋白在各HCC细胞中也呈高表达(均P<0.01),与数据库数据分析结果相符。数据库数据分析还显示,KIF2C与HCC组织中VEGFR2、HIF-1α的表达水平呈正相关(P<0.05或P<0.01)。成功构建了稳定低表达KIF2C的Huh-7和Hep3B2.1-7细胞(均P<0.01),敲低KIF2C表达均可明显抑制Huh-7和Hep3B2.1-7细胞的增殖能力(均P<0.01)、侵袭和迁移能力(均P<0.01),敲低KIF2C表达的HCC细胞条件培养液均可显著抑制体外HUVEC的血管生成能力(P<0.05或P<0.01)。结论:KIF2C可促进Huh-7和Hep3B2.1-7细胞增殖、侵袭和迁移以及HUVEC血管生成的能力,提示KIF2C可能是治疗HCC的潜在靶点。

调控circARF3/miR-338-3p对ox-LDL诱导的血管内皮细胞损伤的影响

目的:探讨调控circARF3/miR-338-3p对氧化型低密度脂蛋白(ox-LDL)诱导的血管内皮细胞损伤的影响及其可能作用机制。方法:采用双荧光素酶报告实验验证circARF3与miR-338-3p的靶向关系。人脐静脉血管内皮细胞(HUVEC)分为6组:空白对照组(未处理)、模型组(50 mg/L ox-LDL处理24 h)、pcDNA组、pcDNA-circARF3组、pcDNA-circARF3+miR-NC组、pcDNA-circARF3+miR-338-3p组,后4组基于脂质体转染法分别转染相应质粒后再用ox-LDL处理24 h。采用MTT法、Annexin V-FITC/PI双染法分别检测细胞增殖及凋亡,Western blot法检测细胞中Bax、Bcl-2蛋白的表达,采用试剂盒检测培养上清液中SOD、LDH活性和MDA的水平,ELISA法检测IL-6、TNF-α水平。结果:circARF3可靶向结合、负向调控miR-338-3p。与空白对照组比较,模型组增殖抑制率、凋亡率和Bax蛋白表达均升高,而Bcl-2蛋白表达降低,培养上清液中SOD活性降低,MDA水平和LDH活性升高,IL-6、TNF-α水平升高(P<0.05);与模型组、pcDNA组相比,pcDNA-circARF3组增殖抑制率、凋亡率和Bax蛋白表达减少,Bcl-2蛋白表达提高,培养上清液中SOD活性升高,MDA水平和LDH活性降低,IL-6、TNF-α水平降低(P<0.05);与pcDNA-circARF3+miR-NC组比较,pcDNA-circARF3+miR-338-3p组增殖抑制率、凋亡率和Bax蛋白表达均升高,Bcl-2蛋白表达降低,培养上清液中SOD活性降低,MDA水平和LDH活性升高,IL-6、TNF-α水平升高(P<0.05)。结论:circARF3过表达可能通过抑制miR-338-3p削弱ox-LDL引发的血管内皮细胞损伤。

人脐带间充质干细胞条件培养基及外泌体对肝癌细胞增殖、迁移、侵袭和凋亡的影响

背景:间充质干细胞可通过分泌含细胞因子、生长因子和外泌体的细胞外囊泡调节肿瘤微环境,对肿瘤细胞生物学行为进行精准调控。目的:研究人脐带间充质干细胞条件培养基及外泌体对肝癌细胞生物学特性的影响。方法:收集人脐带间充质干细胞培养上清,通过高速离心并过滤获得人脐带间充质干细胞条件培养基;收集人脐带间充质干细胞培养上清,通过超高速梯度离心法提取人脐带间充质干细胞外泌体。使用PKH26标记人脐带间充质干细胞外泌体,与肝癌细胞MHCC97-H共培养,荧光显微镜观察MHCC97-H细胞摄取外泌体情况。通过CCK-8增殖实验、Transwell迁移和侵袭实验以及流式凋亡实验评估人脐带间充质干细胞条件培养基、人脐带间充质干细胞外泌体对肝癌细胞生物学功能的影响。结果与结论:(1)人脐带间充质干细胞外泌体可被MHCC97-H细胞摄取且主要分布于细胞质中;(2)人脐带间充质干细胞条件培养基处理后,MHCC97-H细胞的增殖、迁移和侵袭能力显著增强(P<0.001,P<0.05,P<0.01),凋亡能力显著下降(P<0.001);而人脐带间充质干细胞外泌体处理后,MHCC97-H细胞的增殖能力下降(P<0.001),迁移、侵袭及凋亡能力显著增强(P<0.001);(3)结果表明,人脐带间充质干细胞条件培养基具有促进MHCC97-H细胞增殖、迁移、侵袭和抑制凋亡的能力;而人脐带间充质干细胞外泌体则具有促进MHCC97-H细胞迁移、侵袭及凋亡和抑制增殖的能力。

三七皂苷对人脐静脉内皮细胞增殖的影响

目的探讨活血类中药成分三七总皂苷(PNS)对于人脐静脉内皮细胞(HUVECs)增殖的影响。方法体外培养HUVECs,分为空白对照组、PNS低浓度组(10 mg/L)、PNS高浓度组(50 mg/L),各组给予相应浓度药物干预,采用MTT法检测HUVECs增殖率。结果PNS低浓度组、PNS高浓度组的HUVECs增殖率均高于空白对照组(P<0.05)。结论PNS可促进HUVECs增殖,促进血管管腔的形成,对内皮细胞具有积极的影响,在维持血管健康和功能方面发挥着至关重要的作用。

低氧预处理脐带间充质干细胞源外泌体抑制肺动脉平滑肌细胞的增殖

背景:已有研究表明外泌体可以改善低氧性肺动脉高压,而且不同来源、不同环境的外泌体功能存在显著差别。低氧预处理脐带间充质干细胞来源外泌体对大鼠肺动脉平滑肌细胞增殖的影响尚不清楚。目的:探讨低氧预处理人脐带间充质干细胞来源外泌体对低氧诱导的大鼠肺动脉平滑肌细胞增殖的影响。方法:采用组织贴壁法分离培养原代人脐带间充质干细胞,用超滤法提取人脐带间充质干细胞来源外泌体;采用组织消化法分离大鼠肺动脉平滑肌细胞,用CCK-8法测定不同质量浓度外泌体干预肺动脉平滑肌细胞不同时间后的细胞增殖抑制率,确定外泌体作用的适宜质量浓度和干预时间。将第3代肺动脉平滑肌细胞分为常氧对照组、低氧对照组、低氧+常氧外泌体处理组和低氧+低氧外泌体处理组,EdU法检测各组细胞增殖情况,Western blot检测各组细胞核增殖抗原蛋白表达水平。结果与结论:①与常氧对照组相比,低氧对照组肺动脉平滑肌细胞增殖能力明显增加;与低氧对照组相比,低氧+常氧外泌体组细胞增殖能力下降,且低氧+低氧外泌体组增殖能力下降更明显;②与常氧对照组相比,低氧对照组细胞的细胞核增殖抗原蛋白表达升高;与低氧对照组相比,低氧+常氧外泌体组细胞核增殖抗原蛋白表达水平稍微降低,低氧+低氧外泌体组细胞核增殖抗原蛋白表达水平明显降低;③结果表明,低氧预处理人脐带间充质干细胞来源外泌体具有抑制肺动脉平滑肌细胞增殖的能力。

左归丸靶向C-X-C趋化因子受体4对人脐带间充质干细胞体外迁移的影响

目的:探讨左归丸通过靶向调控C-X-C趋化因子受体4(CXCR4)表达对人脐带间充质干细胞(hUC-MSCs)体外迁移的影响。方法:采用组织块法分离培养hUC-MSCs并进行流式鉴定。利用CCK-8检测不同浓度左归丸对hUC-MSCs增殖的影响,细胞划痕和Transwell实验分析左归丸对hUC-MSCs体外迁移的影响,实时聚合酶链反应(PCR)、蛋白印迹法和流式细胞术分析hUC-MSCs中CXCR4表达变化。结果:流式细胞术结果显示,hUC-MSCs表面高表达CD73和CD90,极低表达CD34和CD45。CCK-8结果显示,0.1、0.2 mg/mL左归丸均能明显促进hUC-MSCs增殖(P<0.05)。细胞划痕和Transwell实验结果显示,0.1、0.2 mg/mL左归丸能明显促进hUC-MSCs迁移,最佳浓度为0.2 mg/mL,CXCR4拮抗剂普乐沙福则能抑制其促迁移作用(P<0.05)。实时PCR、蛋白印迹法和流式细胞术结果显示,左归丸能上调hUC-MSCs中CXCR4 mRNA和蛋白表达水平,并促进CXCR4蛋白在细胞膜表达(P<0.05)。结论:左归丸通过上调CXCR4表达促进hUC-MSCs的体外迁移。

多发性骨髓瘤细胞条件培养液对人脐带间充质干细胞增殖和分化的影响

背景:近年来,在肿瘤微环境中干细胞与肿瘤的相互作用已成为研究热点,但是多发性骨髓瘤细胞条件培养液对人脐带间充质干细胞影响的实验鲜有报道。目的:探讨多发性骨髓瘤细胞条件培养液对人脐带间充质干细胞增殖、迁移及分化能力的影响。方法:以组织块贴壁法提取人脐带间充质干细胞,同时培养并提取人多发性骨髓瘤RPMI8226和U266细胞上清液制备条件培养液。按培养基的不同进行细胞分组:对照组人脐带间充质干细胞仅用L-DMEM完全培养液培养;实验组人脐带间充质干细胞用20%RPMI8226细胞条件培养液或20%U266细胞条件培养液和80%L-DMEM完全培养液培养。培养24 h,通过CCK-8、EDU、结晶紫染色观察细胞增殖情况,划痕法评估细胞迁移情况,成骨成脂诱导实验检测细胞分化能力,Real-time PCR检测细胞中周期蛋白基因p16、p21 mRNA表达。结果与结论:实验组细胞的增殖数量多于对照组(P <0.05),迁移率高于对照组(P <0.05),矿化结节染色面积小于对照组(P <0.05),脂滴阳性染色面积大于对照组(P <0.05);实验组的细胞周期基因p16、p21 mRNA表达低于对照组(P <0.05)。结果表明,人多发性骨髓瘤细胞条件培养液可促进人脐带间充质干细胞的增殖、迁移和成脂分化,抑制成骨分化,可能与其抑制p16、p21基因表达有关。

肠道菌群代谢物脱氧胆酸对人脐带间充质干细胞hUC-MSCs增殖及细胞周期的影响

目的探讨肠道菌群代谢物次级胆汁酸DCA不同浓度和不同作用时间在体外环境下对人脐带间充质干细胞(human umbilical cord mesenchymal stem cells,hUC-MSCs)增殖和细胞周期的影响。方法CCK8及流式细胞仪检测在含不同浓度DCA(0.00µmol/L、1.56µmol/L、3.13µmol/L、6.25µmol/L、12.50µmol/L、25.00µmol/L、50.00µmol/L、100.00µmol/L、200.00µmol/L、400.00µmol/L、800.00µmol/L)干细胞培养基中培养hUC-MSCs 24 h、48 h、72 h后,干细胞增殖及细胞周期的变化。结果脱氧胆酸对hUC-MSCs增殖的影响体现在DCA剂量和作用时间两方面(两者交互作用,F=6.622,P<0.001);当浓度一定时,时间越长,细胞增殖越多;当作用时间一定时,浓度越高,细胞增殖抑制。浓度一定时,随时间的增加,细胞阻滞在G0/G1期的比例增加(P<0.001);不同作用时间DCA对hUC-MSCs的细胞周期表现为低浓度组细胞阻滞在G0/G1期和S期,高浓度组细胞阻滞在S期和G2/M期(P<0.001)。结论体外环境下,DCA对hUC-MSCs增殖及细胞周期的影响与浓度和作用时间相关。

缺氧条件下肺岩宁方抑制TC2N的表达对肺癌细胞培养基诱导的HUVEC细胞增殖、迁移侵袭和管腔形成的影响

目的探讨缺氧条件下肺岩宁方(FYN)对肺癌细胞培养基诱导的人脐静脉内皮细胞(HUVEC)增殖、迁移侵袭和管腔形成的影响。方法使用不同浓度的肺岩宁方(200-6400μg·mL^(-1))处理HUVEC细胞,CCK-8法检测细胞存活率,计算其半数抑制浓度(IC_(50)),确定最佳干预浓度。使用A549细胞培养基在缺氧条件下诱导血管新生模型,将HUVEC细胞分为对照组(Control)、模型组(Model)、800μg·mL^(-1)肺岩宁方组(FYN)、100μg·mL^(-1)贝伐珠单抗组(Bevacizumab,阳性对照)、800μg·mL^(-1)肺岩宁方+慢病毒载体组(FYN+vector)、800μg·mL^(-1)肺岩宁方+TC2N过表达组(FYN+TC2N),每组设置6个复孔。分别检测细胞增殖、迁移与侵袭,管腔生成实验评价血管形成,qRT-qPCR检测HIF-1α、TC2N基因水平,Western blot法检测HIF-1α、TC2N、E-cadherin、Vimentin、Snail蛋白表达。结果肺岩宁方对HUVEC细胞的IC_(50)为893.00μg·mL^(-1);与对照组比较,模型组细胞存活率、细胞迁移与侵袭能力、管腔形成节点数、Vimentin、Snail、HIF-1α、TC2N基因及蛋白表达升高,E-cadherin表达降低(P<0.05);与模型组比较,肺岩宁方组与贝伐珠单抗组细胞存活率、细胞迁移与侵袭能力、管腔形成节点数、Vimentin、Snail、HIF-1α、TC2N基因及蛋白表达降低,E-cadherin表达升高(P<0.05);与肺岩宁方+慢病毒载体组比较,肺岩宁方+TC2N过表达组细胞存活率、细胞迁移与侵袭能力、管腔形成节点数、Vimentin、Snail、TC2N基因及蛋白表达升高,E-cadherin表达降低(P<0.05)。结论肺岩宁方可通过抑制TC2N的表达,抑制HUVEC细胞增殖、迁移、侵袭与血管生成。