Nanoscopic Characterization of Cell Migration under Flow Using Optical and Electron Microscopy

Area of Science:

• Cell Biology
• Hematology
• Biophysics

Background:

• Hematopoietic stem/progenitor cell (HSPC) and leukemic cell homing involves interactions with endothelial adhesion molecules.
• Current in vitro methods struggle to accurately image cell migration dynamics on endothelial layers.
• Understanding cell-to-cell interactions during homing is crucial for stem cell research.

Purpose of the Study:

• To develop and validate a novel methodology for imaging stem cell migration on endothelium.
• To enable detailed spatiotemporal characterization of HSPC and leukemic cell rolling dynamics.
• To provide a platform closer to in vivo conditions for studying cell homing.

Main Methods:

• Developed optimized protocols for preserving transient cellular structures during migration.
• Utilized fluorescence and scanning electron microscopy for detailed characterization.
• Simulated physiological shear stress conditions on an endothelium-like cell monolayer.

Main Results:

• Successfully imaged stem-cell-intrinsic details during migration on an endothelium-like monolayer.
• Preserved transient structures crucial for understanding cell-cell interactions.
• Established an experimental platform that mimics in vivo conditions more closely.

Conclusions:

• The new methodology offers unprecedented insights into stem cell migration and homing.
• This technique advances the study of cell-to-cell interactions in hematopoiesis and leukemia.
• The platform will facilitate deeper understanding of stem cell behavior in physiological contexts.