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| 1 | Loss of mismatch repair signaling impairs the WNT–bone morphogenetic protein crosstalk and the colonic homeostasis显示文摘The fine balance between proliferation,differentiation,and apoptosis in the colonic epithelium is tightly controlled by the interplay between WNT,Notch,and bone morphogenetic protein(BMP)signaling.How these complex networks coordinate the colonic homeostasis,especially if cancer predisposing mutations such as mutations in the DNA mismatch repair(MMR)are present,is unclear.Inactivation of the MMR system has long been linked to colorectal cancer;however,little is known about its role in the regulation of the colonic homeostasis.It has been shown that loss of MMR promotes the proliferation of colon epithelial cells that renders them highly susceptible to transformation.The mechanism through which MMR mediates this effect,yet,remains to be determined.Using an MMR-deficient mouse model,we show that increased methylation of Dickkopf1 impacts its expression,and consequently,the ability to negatively regulate WNT signaling.As a result,excessive levels of activeβ-catenin promote strong crypt progenitor-like phenotype and abnormal proliferation.Under these settings,the development and function of the goblet cells are affected.MMR-deficient mice have fewer goblet cells with enlarged mucin-loaded vesicles.We further show that MMR inactivation impacts the WNT–BMP signaling crosstalk. | Katrine Nørgaard Carolin Müller Nadja Christensen María L.Chiloeches Cesilie L.Madsen Sabine S.Nielsen Tine E.Thingholm Antoaneta Belcheva | 2020 | Journal of Molecular Cell Biology2020,12,6: | 1 |
| 2 | Optimal combination of wind power forecasts显示文摘 | Henrik Aa.Nielsen Torben S.Nielsen HenrikMadsen Maria J. San IsidroPindado IgnacioMarti | 2007 | Wind Energ2007,,5: | 1 |
| 3 | Sortilins in the blood-brain barrier:impact on barrier integrity显示文摘Sortilin was discovered in 1997 by Petersen and his colleagues.The single transmembrane receptor was isolated as a 95 kDa membrane glycoprotein by receptor-associated protein affinity chromatography and therefore initially named gp95.The cDNA library screening revealed sequence homology between the luminal segment of gp95/sortilin and the yeast vacuolar sorting protein 10 protein(Vps10p)domain(Petersen et al.,1997).The Vps10p domain was first identified in the Saccharomyces cerevisiae protein Vps10p that directs lysosomal enzymes from the Golgi to the vacuole(Marcusson et al.,1994). | Andrea E.Toth Morten S.Nielsen | 2023 | Neural Regeneration Research2023,18,3: | 1 |
| 4 | 地震复发模型:弹性波辐射、摩擦松弛和非均匀性的作用显示文摘我们建立了一个地震活动性的动力学模型,其中断层被埋藏在无限、连续的弹性介质中。因此,该模型充分考虑了地震波辐射所耗散的能量对模型地震序列进程的影响。在这个模型中,破裂时的摩擦降逐渐发生,这样便引入一个松弛尺度。作为一个例子,我们考虑一个有限均匀断层,其端部由无限强障碍体限定,从不可破裂的障碍体反射来的应力控制了地震活动性特征。地震活动性图象强烈地依赖于松弛尺度和端部障碍体之间的距离之比值。当这个参数很大时,我们发现在一个短暂的时间间隔后即出现周期性,相应于从一头到另一头的贯穿断层的大地震控制了统计分布特征。当这个参数很小时,小尺度地震活动分布在大地震之间,在我们所涉及的计算时间内未看到周期性。我们的结论是在地震活动的动力学过程模型中,像障碍体(我们假设它在自然界由于断层的不均匀几何结构而形成)之类的不可克服的非均匀体,不但在引起地震活动的复杂进程方面,而且在产生单个地震震源时间函数的复杂特征方面都是极为重要的因素。 | S.Nielsen L.Knopoff A.Tarantola 李瑞芬 | 1996 | 世界地震译丛1996,27,5: | 0 |
| 5 | 复杂天然断裂带流体流动数值模拟:对天然及人工诱发地震起始的意义显示文摘活动断层系统中的孔隙流体超压会驱动流体流动,并最终导致断层强度降低和地震活动。由不同破裂模式(例如,脆性与韧性)引起的变形会影响断层带的渗透率,从而影响流体流动和孔隙流体压力分布。当前的数值模拟技术主要针对流体流动对断层再活化以及相关地震活动的控制作用。然而在地震起始阶段,对于孔隙流体压力是否影响从慢速无震断层滑动到快速地震断层滑动过渡的过程,仍然知之甚少。本文中,我们对天然断层中的超压状态下超临界CO2流体的流动进行模拟,断层中的流体流动、流体压力和岩体变形之间复杂的非线性关系控制着地震起始的长度和地震间隔周期的持续时间。我们的模型基于意大利北部亚平宁山脉最近的地震活动[例如,1997~1998年科尔菲奥里托(Colfiorito)MW6.0地震和2016年诺尔恰MW6.5地震]进行设置。我们对达西(Darcy)流体流动模拟的结果表明,在将实际复杂断层带构造、孔隙压力和岩石变形相关渗透率三个因素同时考虑在内时,起始阶段的持续时间可以减少几个数量级。特别地,起始阶段的持续时间可以从10年以上减少到几天,甚至是几分钟,而地震矩可减少6倍。值得注意的是,在本研究中,通过地震起始模拟获得的无震滑移地震矩(M0=109N·m),与使用应变计进行局部应变测量的检测极限数量级相同。这些发现对于地震早期预警系统具有重要意义,因为地震起始阶段的持续时间和力矩将影响地震前兆信号探测的可能性。有趣的是,在最近的一些大地震之前的几个月,已经测量到了无震滑移,尽管这些地震的构造背景与本文所构建的模型有所不同,但这也重新引起了我们对地震起始的兴趣。此外,我们的结果对于短期和长期地震预报也具有重要意义,因为在地震间隔期间地壳流体的迁移可能会控制断层强度和地震重现期。 | T.Snell N.De Paola J.van Hunen S.Nielsen C.Collettini 张伟(译) 高翔(译) 刘海浩(译) 兰晓雯(校) | 2020 | 世界地震译丛2020,51,6: | 0 |