Stem cells:间充质干细胞释放的细胞外囊泡可在未进行造血干细胞支持的情况下维持辐射损伤小鼠长期存活。

2017-10-19 qinqiyun MedSci原创

间充质干细胞(MSC)对组织再生的治疗效果主要依赖于生物活性分子的分泌。现研究人员发现来源于小鼠骨髓的间充质干细胞(mMSC)的抗辐射效应可归咎为其释放的细胞外囊泡(EV)。将mMSC来源的EV植入接受致命性辐射的小鼠,可使小鼠长期存活,但不能改善小鼠的短期重构。

间充质干细胞(MSC)对组织再生的治疗效果主要依赖于生物活性分子的分泌。现研究人员发现来源于小鼠骨髓的间充质干细胞(mMSC)的抗辐射效应可归咎为其释放的细胞外囊泡(EV)。将mMSC来源的EV植入接受致命性辐射的小鼠,可使小鼠长期存活,但不能改善小鼠的短期重构。

重要的是,在没有额外的造血支持的情况下,对辐射损伤的治疗也是有效的。在体外,研究人员证实EV是对辐射过的造血干细胞具有保护作用,但对基质细胞培养的和结肠来源的祖细胞没有作用。

将标记的EV系统地注射到受过致命的辐照后的小鼠,标记的EV在2小时内自由地穿过身体并到达骨髓。研究人员进一步将EV的直接靶点的Sca-1阳性和c-kit低阳性的干细胞长期注入小鼠体内,可使小鼠长期存活。

研究结果表明EV可作为有效的一线疗法,抵抗辐射诱导的造血衰竭,或许可用于缓解化疗和毒性药物反应所导致的骨髓抑制。研究人员建议注射MSC来源的EV作为辐射损伤后的主要治疗选择。

原始出处:


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    2017-10-21 jiyangfei
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加州大学尔湾分校科学家Weian Zhao博士实验室通过基因工程建立了一种新的间充质干细胞(MSC),这种新型干细胞可以靶向识别“僵硬”的转移性肿瘤细胞,并将癌症药物精准递送至肿瘤组织。

J Periodontal Res:牙周韧带内骨髓来源细胞通过基质细胞衍生因子/趋化因子受体4型生物轴募集

目的:牙周韧带(PDL)是位于牙槽骨和牙根表面牙骨质之间的非矿化结缔组织,在牙齿功能中起重要作用。 PDL储备有能分化为多种类型细胞的多能干细胞。然而,除了其起源之外,这些干细胞的来源尚不清楚。

Brain Behav:间充质干细胞可以治疗中风、神经损伤和中暑吗?

本文对有关MSC治疗包括脑卒中、神经损伤和中暑等不同种类的脑损伤的文章进行了回顾性研究,文献来源为网络数据库检索(例如PubMed),筛选时主要强调有关MSC治疗对神经功能保护的机制。我们的目的是讨论神经干细胞在治疗中风、神经损伤和中暑中对神经保护机制的有益作用。

J Extracell Vesicles:神经母细胞瘤来源的外泌体可通过MSCs促进致瘤因子的产生

骨髓(BM)龛是促进肿瘤细胞存活、休眠以及治疗性抵抗的微环境。发挥此功能的核心是间充质干细胞(MSCs)。研究人员使用神经母细胞瘤(NB)作为模型进行探究,结果表明,NB细胞释放富含蛋白质但缺乏细胞因子和趋化因子的细胞外囊(EVS)。研究人员使用三种不同的纯化方法,结果表明,Nb来源的外泌体可被MSCs捕捉并诱导致瘤性细胞因子和趋化因子的产生,包括白细胞介素-6(IL-6)、IL-8/CXCL8,

科学家发现功能活性更强的间充质干细胞

中国医学科学院北京协和医学院教授韩忠朝研究团队首次将胎盘间充质干细胞中功能活性最强的细胞亚群鉴别出来,并申请了专利,这就是CD106分子阳性的胎盘间充质干细胞。

J Periodontol:骨髓基质细胞中瘦素过表达促进骨质疏松大鼠牙周再生

骨质疏松与广泛性牙周炎和受损的牙周愈合有关。然而,在骨质疏松症的影响下,缺乏有关再生方法的结果的信息。本研究调查了瘦素(LEP)过表达对骨质疏松大鼠牙周膜开窗缺损模型中骨髓基质细胞(BMSCs)的再生潜力的影响。