Chlorpromazine modulates the morphological macro- and microstructure of endothelial cells

Chlorpromazine (CP), an amphipathic, antipsychotic agent, causes concave me mbrane bending in red blood cells with formation of stomatocytic shapes by modulation of the phospholipid bilayer. This study was designed to investig ate the effects of CP on the shape of bovine aortic endothelial cells (BAEC ) and their membranes in confluent monolayers with phase-contrast and trans mission electron microscopy. Exposure of BAECs to nanomolar levels of CP le ads to membrane curvature changes. With increasing CP concentrations, the m embrane assumed a shape with enhanced numbers of intracellular caveolae and projection of pseudopodia at all junctions. At higher CP concentrations (u p to 150 mu M), the endothelial cells assumed almost spherical shapes. The evidence suggests that CP may affect lipid bilayer bending of BAECs in anal ogy with previous observations on erythrocytes, supporting the formation of caveolae and pseudopodia in BAECs due to the induction of concave membrane bending, as well as an effect on endothelial cell membrane adhesion at hig her CP concentrations with loss of cellular attachment at junctions.