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Platelet Adhesion and Aggregation Under Flow using Microfluidic Flow Cells
Published on: October 27, 2009
Microenvironmental geometry guides platelet adhesion and spreading: a quantitative analysis at the single cell level
Ashley Kita1, Yumiko Sakurai, David R Myers
1Division of Pediatric Hematology/Oncology, Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia, United States of America.
Plos One
|October 27, 2011
Summary
Platelets use physical cues to guide their spreading during clot formation. This study reveals how microenvironmental geometry precisely directs platelet behavior and cytoskeletal organization for effective hemostasis.
Area of Science:
- Biophysics
- Cell Biology
- Biomedical Engineering
Background:
- Platelets are crucial for hemostasis, adhering and spreading at vascular injury sites.
- The biochemical aspects of platelet function are known, but the influence of physical microenvironmental cues remains unclear.
Purpose of the Study:
- To quantitatively investigate and characterize the spatial guidance of platelet spreading using nanoscale resolution.
- To understand how microenvironmental geometry affects platelet adhesion and spreading.
Main Methods:
- Utilized deep UV photolithography and protein micro/nanostamping.
- Applied micropatterned collagen or fibrinogen surfaces to study platelet behavior.
- Investigated platelet response to patterned lines of varying widths.
Main Results:
- Platelets adhered and spread on micropatterned surfaces, precisely following geometric cues.
- Platelets conformed to stripes as thin as 0.6 µm and spanned non-patterned regions up to 5 µm.
- Microenvironmental geometry influenced platelet actin cytoskeleton organization and distribution.
Conclusions:
- Platelet spreading is a finely-tuned, spatially-guided process.
- Spatial cues directly influence the biological regulation of clot formation.
- Platelet filopodia are sensitive to microenvironmental geometry, mediating spreading.
