  In this paper, we examine the emergence of cell flow induced by a tension
gradient on a tissue interface as in the case of the Marangoni flow on liquid
interface. We consider the molecule density polarity of the heterophilic
adhesion between tissues as the origin of the tension gradient. By applying the
cellular Potts model, we demonstrate that polarization in concentration (i.e.,
intracellular localization) of heterophilic adhesion molecules can induce a
cell flow similar to the Marangoni flow. In contrast to the ordinary Marangoni
flow, this flow is oriented in the opposite direction to that of the tension
gradient. The optimal range of adhesion strength is also identified for the
existence of this flow.
