Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 270, Issue 2, Pages 616-621Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1006/bbrc.2000.2482
Keywords
endothelial cell; shear stress; macromolecule uptake; mitochondrial membrane potential; ATP
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Endothelial cells (ECs) that line the inner surface of blood vessels are continuously exposed to shear stress induced by blood flow in vivo and shear stress affects ATP-dependent macromolecular transport in ECs. However, the relationship between the ATP production and shear stress is still unclear. We, therefore, evaluated mitochondrial ATP synthesis activity in cultured endothelial cells exposed to shear stress, using a confocal laser scanning microscope (CLSM) and a mitochondrial membrane potential probe (5,5',6,6'-tetrachloro-1,1',3,3'-tetraethyl-benzimidazolycarbocyanine iodide, JC-l). Low shear stress (10 dyn/cm(2)) increased mitochondrial membrane potential by 30%. On the contrary, high shear stress (60 dyn/cm(2)) decreased it by 20%. This observation was consistent with the ATP-dependent albumin uptake into endothelial cells. Our results indicate that ATP synthetic activity is related to the albumin uptake into endothelial cells. (C) 2000 Academic Press.
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