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Am J Physiol Cell Physiol 278: C873-C878, 2000;
0363-6143/00 $5.00
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Vol. 278, Issue 5, C873-C878, May 2000

Chlorpromazine modulates the morphological macro- and microstructure of endothelial cells

I. S. Hueck1, H. G. Hollweg2, G. W. Schmid-Schönbein3, and G. M. Artmann1

1 Cell Biophysics, University of Applied Sciences Aachen/Juelich; 2 Institute of Pathology, Rheinisch Westfälische Technische Hochschule Aachen, Neues Klinikum, Germany; and 3 Department of Bioengineering, University of California San Diego, La Jolla, California

Chlorpromazine (CP), an amphipathic, antipsychotic agent, causes concave membrane bending in red blood cells with formation of stomatocytic shapes by modulation of the phospholipid bilayer. This study was designed to investigate the effects of CP on the shape of bovine aortic endothelial cells (BAEC) and their membranes in confluent monolayers with phase-contrast and transmission electron microscopy. Exposure of BAECs to nanomolar levels of CP leads to membrane curvature changes. With increasing CP concentrations, the membrane assumed a shape with enhanced numbers of intracellular caveolae and projection of pseudopodia at all junctions. At higher CP concentrations (up to 150 µM), the endothelial cells assumed almost spherical shapes. The evidence suggests that CP may affect lipid bilayer bending of BAECs in analogy 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 higher CP concentrations with loss of cellular attachment at junctions.

membrane vesiculation; pseudopodia formation; phospholipid bilayer bending; endothelial cell culture; caveolae


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