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Structural analysis of resting mouse platelets by 3D-EM Reveals an unexpected variation in alpha-granule shape

机译:3D-EM静息小鼠血小板的结构分析揭示了α-颗粒形状的意外变化

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Mice and mouse platelets are major experimental models for hemostasis and thrombosis; however, important physiological data from this model has received little to no quantitative, 3D ultrastructural analysis. We used state-of-the-art, serial block imaging scanning electron microscopy (SBF-SEM, nominal Z-step size was 35 nm) to image resting platelets from C57BL/6 mice. alpha-Granules were identified morphologically and rendered in 3D space. The quantitative analysis revealed that mouse alpha-granules typically had a variable, elongated, rod shape, different from the round/ovoid shape of human alpha-granules. This variation in length was confirmed qualitatively by higher-resolution, focused ion beam (FIB) SEM at a nominal 5 nm Z-step size. The unexpected alpha-granule shape raises novel questions regarding alpha-granule biogenesis and dynamics. Does the variation arise at the level of the megakaryocyte and alpha-granule biogenesis or from differences in alpha-granule dynamics and organelle fusion/fission events within circulating platelets? Further quantitative analysis revealed that the two major organelles in circulating platelets, alpha-granules and mitochondria, displayed a stronger linear relationship between organelle number/volume and platelet size, i.e., a scaling in number and volume to platelet size, than found in human platelets suggestive of a tighter mechanistic regulation of their inclusion during platelet biogenesis. In conclusion, the overall spatial arrangement of organelles within mouse platelets was similar to that of resting human platelets, with mouse alpha-granules clustered closely together with little space for interdigitation of other organelles.
机译:小鼠和小鼠血小板是止血和血栓形成的主要实验模型;然而,该模型的重要生理数据几乎没有得到定量的3D超微结构分析。我们使用最先进的连续块成像扫描电子显微镜(SBF-SEM,标称Z步长为35 nm)对C57BL/6小鼠的静止血小板进行成像。对α颗粒进行形态学鉴定,并在3D空间进行渲染。定量分析显示,小鼠α颗粒通常具有可变的、细长的杆状,不同于人类α颗粒的圆形/卵圆形。这种长度的变化通过标称5nm Z步长的高分辨率聚焦离子束(FIB)SEM定性证实。意料之外的α颗粒形状提出了有关α颗粒生物成因和动力学的新问题。这种变异是发生在巨核细胞和α颗粒生物发生的水平上,还是来自循环血小板内α颗粒动力学和细胞器融合/分裂事件的差异?进一步的定量分析显示,循环血小板中的两个主要细胞器,α颗粒和线粒体,在细胞器数量/体积和血小板大小之间表现出更强的线性关系,即数量和体积与血小板大小之间的比例关系,这比在人类血小板中发现的情况更紧密,表明在血小板生物发生过程中,它们的包涵体受到更严格的机械调节。总之,小鼠血小板内细胞器的总体空间排列与静止的人类血小板相似,小鼠α颗粒紧密聚集在一起,其他细胞器的交叉空间很小。

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