PNAS:浙大学者揭示骨质疏松发病机理

2017-09-23 海北 MedSci原创

年龄相关的骨质疏松是一个重要的健康问题,其主要表现为成骨细胞介导的骨形成减少,以及衰老相关的骨髓脂肪化,导致骨重塑和代谢的不平衡。骨髓间充质干细胞(MSCs)是一种多能性干细胞,其能产生成骨细胞,脂肪细胞和软骨细胞。机体的衰老会伴随着向成骨细胞的分化减少,而向脂肪细胞的分化增加。现今,转录因子调节间充质干细胞分化谱系的机制尚不清楚。

年龄相关的骨质疏松是一个重要的健康问题,其主要表现为成骨细胞介导的骨形成减少,以及衰老相关的骨髓脂肪化,导致骨重塑和代谢的不平衡。骨髓间充质干细胞MSCs)是一种多能性干细胞,其能产生成骨细胞、脂肪细胞和软骨细胞。机体的衰老会伴随着向成骨细胞的分化减少,而向脂肪细胞的分化增加。现今,转录因子调节间充质干细胞分化谱系的机制尚不清楚。

为了确定核心结合因子亚基βCbfβ)在成骨细胞谱系分化中的作用,来自浙江大学的研究人员通过敲除不同成骨细胞谱系阶段的Cbfβ,建立了三种小鼠模型。研究人员发现,Cbfβf/fPrx1-Cre,Cbfβf/fCol2α1-Cre和Cbfβf/fOsx-Cre的小鼠表现出严重的骨质疏松症,并伴随着骨髓脂肪细胞的显著积累,和老年骨骼的情况类似。这表明间充质干细胞以及成骨细胞可以分别被编程或重编程成为脂肪细胞。同时,Cbfβ缺乏的颅骨细胞和骨髓间充质干细胞也表现出强的脂肪形成潜能,脂肪细胞基因表达增加5~70倍。这些表型可以通过Cbfβ的过表达来拯救。

传统Wnt信号在Cbfβ缺陷细胞中受阻,Wnt10b表达降低约80%。ChIP和荧光素酶测定表明Cbfβ/ RUNX2与驱动Wnt10b表达的Wnt10b启动子结合。此外,Wnt3a抑制脂肪形成,但不能在Cbfβ缺陷细胞中促进成骨细胞形成。值得注意的是,Cbfβ缺陷型与正常细胞的混合培养显示Cbfβ不仅通过WNT旁分泌途径起作用,而且通过内源信号传导作用。进一步的分析表明Cbfβ/ RUNX2在转录水平上抑制c /ebpα表达。

因此,研究人员的结果表明,除了成骨作用外,Cbfβ通过增强β-连环蛋白信号以及抑制脂肪形成基因表达来维持成骨细胞谱系承诺。Cbfβ可能是骨质疏松症的潜在治疗靶点。


原始出处:

Mengrui Wu et al. Cbfβ governs osteoblast−adipocyte lineage commitment through enhancing β-catenin signaling and suppressing adipogenesis gene expressionProceedings of the National Academy of Sciences, 2017; 114 (38): 10119 DOI: 10.1073/pnas.1619294114


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    2017-12-01 drwjr
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    2017-09-24 Eleven17
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    2017-09-23 hfuym10906

    学习了学习了学习了学习了学习了学习了学习了学习了学习了

    0

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    2017-09-23 Julie W

    年龄相关的骨质疏松是一个重要的健康问题.其主要表现为成骨细胞介导的骨形成减少.以及衰老相关的骨髓脂肪化.导致骨重塑和代谢的不平衡.骨髓间充质干细胞(MSCs)是一种多能性干细胞.其能产生成骨细胞.脂肪细胞和软骨细胞.机体的衰老会伴随着向成骨细胞的分化减少.而向脂肪细胞的分化增加.现今.转录因子调节间充质干细胞分化谱系的机制尚不清楚.

    0

  7. 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createdAvatar=http://thirdwx.qlogo.cn/mmopen/vi_32/DYAIOgq83erHmiaPStHsBjHGm3Y4ZHHanFXRDgAiaEiabOGdC4Q6KfAYrmmuicVyBk7YMJOMXTuQnIpZqReTiceibjdg/132, createdBy=2ab92087896, createdName=陈方郑, createdTime=Sat Sep 23 07:55:45 CST 2017, time=2017-09-23, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=246854, encodeId=7c452468549b, content=谢谢.学习了, beContent=null, objectType=article, channel=null, level=null, likeNumber=61, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=ad4c106013, createdName=Drhzm308, createdTime=Sat Sep 23 07:53:37 CST 2017, time=2017-09-23, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=246853, encodeId=ea0a246853f7, content=学习了.获益匪浅!感谢分享, beContent=null, objectType=article, channel=null, level=null, likeNumber=61, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://cdnapi.center.medsci.cn/medsci/head/2017/07/17/0ed05bbc4eb124766d2a39104932ec4e.jpg, createdBy=5afd2091871, createdName=情途末路, createdTime=Sat Sep 23 07:49:32 CST 2017, time=2017-09-23, status=1, ipAttribution=)]
    2017-09-23 陈方郑

    好好干不敢苟同古古怪怪嘎嘎嘎嘎

    0

  8. 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createdAvatar=http://thirdwx.qlogo.cn/mmopen/vi_32/DYAIOgq83erHmiaPStHsBjHGm3Y4ZHHanFXRDgAiaEiabOGdC4Q6KfAYrmmuicVyBk7YMJOMXTuQnIpZqReTiceibjdg/132, createdBy=2ab92087896, createdName=陈方郑, createdTime=Sat Sep 23 07:55:45 CST 2017, time=2017-09-23, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=246854, encodeId=7c452468549b, content=谢谢.学习了, beContent=null, objectType=article, channel=null, level=null, likeNumber=61, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=ad4c106013, createdName=Drhzm308, createdTime=Sat Sep 23 07:53:37 CST 2017, time=2017-09-23, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=246853, encodeId=ea0a246853f7, content=学习了.获益匪浅!感谢分享, beContent=null, objectType=article, channel=null, level=null, likeNumber=61, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, 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    2017-09-23 Drhzm308

    谢谢.学习了

    0

  9. 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    2017-09-23 情途末路

    学习了.获益匪浅!感谢分享

    0

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慢性牙周炎是一种骨质破坏性炎症性疾病,对健康有不利影响,与骨质疏松症可能相关。一些研究检测了慢性牙周炎与骨质疏松之间可能的关系;然而,仍然没有确定的结果。这项纵向随访研究通过使用基于人群的台湾健康保险数据,研究慢性牙周炎患者出现骨质疏松症的可能的风险。

Am J Clin Nutr:异黄酮联合益生菌能否改善绝经妇女的骨质流失?

2017年9月,发表在《Am J Clin Nutr》上的一项12个月、双盲、平行设计、安慰剂对照、随机对照研究,调查了异黄酮与益生菌联合用药能否改善绝经妇女因雌激素减少引起的骨质流失。结果表明,两者联合对绝经妇女因雌激素缺乏的骨质流失有很大改善。

Menopause:一举两得!雌激素治疗绝经后女性骨质疏松还能降低牙周炎患病率

绝经后女性由于雌激素减少会加速骨量的流失,使骨密度下降,极易引起骨质疏松症。2017年7月,发表在《Menopause》的一项研究调查了绝经后女性骨质疏松治疗和重症牙周炎之间的相关性。

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。

重复:JCO:一箭双雕 双膦酸盐治疗绝经后女性骨质疏松还能降低乳腺癌风险?

当前,有关绝经后女性使用双膦酸盐与乳腺癌风险相关性的研究结论各不相同。2017年7月,发表在《J Clin Oncol.》的一项2004年至2011年的绝经后女性观察性队列研究表明,双膦酸盐用于治疗绝经后女性骨质疏松不会降低乳腺癌发生率。

Br J Dermatol:红细胞生成性原卟啉症患者患骨质疏松的危险因素有哪些?

背景:红细胞生成性原卟啉症是一种罕见的代谢性疾病,为常染色体显性遗传,过量原卟啉产生光敏性皮肤损害,患者需终身避光。目标:本研究的目的是在红细胞生成性原卟啉症患者中评估骨密度和已知的骨质疏松危险因素。方法:这是一个横断面研究,研究中所有的红细胞生成性原卟啉症患者都是伊拉斯姆斯大学医学部的门诊患者,他们都曾接受骨密度测量。研究人员测量了他们的血浆25羟-维生素D、碱性磷酸酶、甲状旁腺素和原卟啉IX总