Clinical Study A Sensitive Chemotaxis Assay Using a Novel Microfluidic Device

which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Existing chemotaxis assays do not generate stable chemotactic gradients and thus—over time—functionally measure only nonspecific randommotion (chemokinesis). In comparison,microfluidic technology has the capacity to generate a tightly controlled microenvironment that can be stablymaintained for extended periods of time and is, therefore, amenable to adaptation for assaying chemotaxis. We describe here a novel microfluidic device for sensitive assay of cellular migration and show its application for evaluating the chemotaxis of smooth muscle cells in a chemokine gradient. 1