Abstract
Blood platelets play a central role in the arrest of bleeding and the development of thrombosis. Unraveling the complex processes of platelet biogenesis from megakaryocytes, platelet adhesion, aggregation, and secretory responses are important topics in the field of hemostasis and thrombosis. Analysis of the ultrastructural changes that occur during these processes is essential for understanding the rapid membrane dynamics and has contributed substantially to our present knowledge of platelet formation and functioning. Recent developments in real-time imaging, correlative light and electron microscopy imaging (CLEM), and 3D (cryo) electron microscopy and tomography offer exciting opportunities to improve studies of the platelet adhesive responses and secretion at the ultrastructural level in a close to native environment. In this chapter we discuss and illustrate cryo preparation techniques (high-pressure freezing, vitrification), correlative LM and EM workflows, and 3D cryo-electron tomography that we apply in our current research projects.
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Abbreviations
- EM:
-
Electron microscopy
- ET:
-
Electron tomography
- CLEM:
-
Correlative light and electron microscopy
- FS:
-
Freeze substitution
- HPF:
-
High-pressure freezing
- LN2:
-
Liquid nitrogen
- CCD:
-
Charge coupled device
- 3D:
-
Three-dimensional
- vWF:
-
von Willebrand factor
- SIRT:
-
Simultaneous iterative reconstruction technique
- Missing Wedge:
-
Missing information due to limited tilt angles
- Contouring:
-
Manual drawing of contour lines in slices of a tomogram
- Tomogram:
-
Computed 3D volume reconstruction of a specimen by using multiple projection images
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The movie shows the subsequent analytical steps for RT-CLEM and tomography of platelet whole mounts using the iCorrtm. Platelets spread conjugated anti-vWF and 10 nm Protein A gold. Regions of interest (green IF spots, reflecting luminal vWF release) were sequentially imaged in IF and TEM mode using the iCorr software package (iCorrtm FEI Company). Tilt series were recorded and aligned using the IMOD softwareon fibrinogen-coated EM supports were double immunolabeled with Alexa 488 (MP4 29686 kb)
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Engberts, K.B., Seinen, C., Geerts, W.J.C., Heijnen, H.F.G. (2018). Electron Tomography and Correlative Approaches in Platelet Studies. In: Gibbins, J., Mahaut-Smith, M. (eds) Platelets and Megakaryocytes . Methods in Molecular Biology, vol 1812. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-8585-2_4
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DOI: https://doi.org/10.1007/978-1-4939-8585-2_4
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