Interactions between epithelial cells after their exposure to ultrasounds

Motions of a pair of epithelial cells over a substrate become altered after their exposure to ultrasonic waves at a frequency close to 1 MHz. An irradiation of 20 min on the cell samples produces on them long-term effects, which experience alternating slow attraction repulsion processes in direction perpendicular the acoustic vector direction. One cell approaches toward the other one, which shows retractile motion of its fillopodia, acquiring a rounded shape in self-protection mode. after some hours, the situation is reversed: the retracted cell ceases to be so and begins to advance towards the “invading” cell, reversing the roles. These approaching-repulsion processes take several hours after the ultrasonic irradiation during the culture. These experiments evidence singular long-term effects of the ultrasounds on the biodynamics of epithelial cells at certain acoustic conditions.