Stem cells:间充质干细胞不能适应低糖环境,细胞内糖储量迅速耗竭,可解释为何移植后间充质干细胞存活率低。

2018-01-15 MedSci MedSci原创

间充质干细胞(MSCs)在组织工程(TE)中具有相当大的潜力。但是,进行外源性干预时存活率低,限制了MSCs的治疗潜力。既往研究表明葡萄糖(glc)缺乏(缺氧不是)对人类MSCs来说是致命的,因为在人类MSCs(hMSCs)移植过程中,葡萄糖充当其促存活和促血管生成分子。但,目前尚不明确移植过程中MSCs通过哪条能量代谢途径来代谢glc,是否存在可代替glc的能量营养?更重要的是,hMSCs内是否

间充质干细胞(MSCs)在组织工程(TE)中具有相当大的潜力。但是,进行外源性干预时存活率低,限制了MSCs的治疗潜力。既往研究表明葡萄糖(glc)缺乏(缺氧不是)对人类MSCs来说是致命的,因为在人类MSCs(hMSCs)移植过程中,葡萄糖充当其促存活和促血管生成分子。

但,目前尚不明确移植过程中MSCs通过哪条能量代谢途径来代谢glc,是否存在可代替glc的能量营养?更重要的是,hMSCs内是否有储备glc以确保其在移植过程中存活?上述问题仍是以TE为基础的治疗方案的前沿问题。

在本研究中,研究人员首次证实hMSCs在体内存活的最适微环境是近乎缺氧(0.1% O2),而不是体外时的低氧(1%-5% O2)。在近乎缺氧的环境下,hMSCs几乎完全依赖glc,通过无氧糖酵解的方式产生ATP,并且不能利用外源性谷氨酰胺、丝氨酸或丙酮酸作为能量底物。

更重要的是,hMSCs的代谢不能适应缺乏外源性glc,而且细胞内储备的glc非常有限,几乎没有ATP储备。由于缺乏对能量周转率的下调功能,使得外源性glc水平低时会导致hMSC的能量储备迅速耗竭,这也解释了为何其存活率低。本研究结果促进了glc释放支架的发展,或可促进以TE为基础的疗法的临床应用。

原始出处:


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    2018-12-23 daviiliu
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    2018-10-17 维他命
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  5. 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ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1614971, encodeId=f80616149e1a7, content=<a href='/topic/show?id=d74a44e2e7' target=_blank style='color:#2F92EE;'>#cells#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=21, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4472, encryptionId=d74a44e2e7, topicName=cells)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=659819575782, createdName=124988c7m101暂无昵称, createdTime=Wed Jan 17 12:51:00 CST 2018, time=2018-01-17, status=1, ipAttribution=)]
    2018-01-27 大爰

    学习了谢谢分享!!

    0

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ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1614971, encodeId=f80616149e1a7, content=<a href='/topic/show?id=d74a44e2e7' target=_blank style='color:#2F92EE;'>#cells#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=21, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4472, encryptionId=d74a44e2e7, topicName=cells)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=659819575782, createdName=124988c7m101暂无昵称, createdTime=Wed Jan 17 12:51:00 CST 2018, time=2018-01-17, status=1, ipAttribution=)]
    2018-01-17 天涯183

    非常好的文章.学习了

    0

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帕金森病(PD)是常见的神经退行性疾病之一。临床症状为:运动过缓、肌强直、静止性震颤、姿势步态异常,认知/精神异常、睡眠障碍、自主神经功能障碍、感觉障碍。

Stem cells:年老的造血干细胞可通过与年轻的干细胞相互作用而重返年轻!

在骨髓移植中,供体的年龄是一个重要的关注点,因为年老的造血干细胞(HSCs)移植效率相对较低。研究人员通过小鼠系统发现,年老的HSCs与年幼的间充质干细胞(MSCs)短暂的相互作用,可通过细胞间转移含有自噬相关的mRNAs的微型囊泡(MVs)而使年老的HSCs年轻化、恢复细胞功能,同时MSCs的AKT信号被激活,出现老化。激活的AKT会减少细胞微型囊泡内的自噬相关的mRNAs,并将miR-17和m

Stem cells:激活AKT-mTOR信号,可促进间充质干细胞的肌腱发生过程。

由于目前对肌腱发生过程的认识有限,在临床上肌腱修复仍有一定困难。I型胶原(胶原I)和其他细胞外基质的合成对肌腱的分化和稳态均至关重要。当前关于肌腱发生的研究主要集中在肌腱的转录因子,而在转录水平调控肌腱发生的信号仍存在很大未知。有研究人员发现雷帕霉素(mTOR)信号的机械性靶点可被原生生长因子、转化生长因子β1和胰岛素样生长因子I激活。在间充质干细胞(MSCs)形成肌腱的过程中mTOR的表达上调。

J Mol Histol:新的研究为间充质干细胞的成骨分化提供了一个新的策略

在适宜的条件下间充质干细胞(MSC)可以分化成骨细胞。近年来,由于考虑到安全性,逐渐开始使用微核苷酸调节细胞中基因的表达。本研究旨在探究Noggin-siRNA和antimiR-138的共递送是否可增强MSCs的成骨作用。使用小鼠MSC系的C3H/10T1/2细胞,通过定量实时聚合酶链式反应(qRT-PCR)评估Noggin-siRNA和antimiR-138向MSCs中的递送效率。流式细胞术和M