Leukocytes cross the endothelial monolayer using the paracellular or the transcellular route. We developed a simple assay to follow the distribution of endogenous junctional VE-cadherin and PECAM-1 during leukocyte transendothelial migration under physiological flow to discriminate between the two transmigration routes.
Kroon, J., Daniel, A. E., Hoogenboezem, M., van Buul, J. D. Real-time Imaging of Endothelial Cell-cell Junctions During Neutrophil Transmigration Under Physiological Flow. J. Vis. Exp. (90), e51766, doi:10.3791/51766 (2014).