on October 6, 2005
Arteriosclerosis, Thrombosis, and Vascular Biology. 2005
Published online before print October 6, 2005, doi: 10.1161/01.ATV.0000189159.96900.d9
Published online before print October 6, 2005, doi: 10.1161/01.ATV.0000189159.96900.d9
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Submitted on June 16, 2005
Accepted on September 15, 2005
Peroxynitrite Causes Endoplasmic Reticulum Stress and Apoptosis in Human Vascular Endothelium. Implications in Atherogenesis
Jeffrey G. Dickhout ;
árka Lhoták ;
From the Henderson Research Centre and McMaster University, Hamilton, Canada.
* To whom correspondence should be addressed. E-mail: raustin{at}thrombosis.hhscr.org.
Objective--Peroxynitrite, a potent oxidant generated by the reaction of NO with superoxide, has been implicated in the promotion of atherosclerosis. We designed this study to determine whether peroxynitrite induces its proatherogenic effects through induction of endoplasmic reticulum (ER) stress.
Methods and Results--Human vascular endothelial cells treated with Sin-1, a peroxynitrite generator, induced the expression of the ER chaperones GRP78 and GRP94 and increased eIF2
phosphorylation. These effects were inhibited by the peroxynitrite scavenger uric acid. Sin-1 caused the depletion of ER-Ca2+, an effect known to induce ER stress, resulting in the elevation of cytosolic Ca2+ and programmed cell death (PCD). Sin-1 treatment was also found, via 3-nitrotyrosine and GRP78 colocalization, to act directly on the ER. Adenoviral-mediated overexpression of GRP78 in endothelial cells prevented Sin-1-induced PCD. Consistent with these in vitro findings, 3-nitrotyrosine was observed and colocalized with GRP78 in endothelial cells of early atherosclerotic lesions from apolipoprotein E-deficient mice.
Conclusions--Peroxynitrite is an ER stress-inducing agent. Its effects include the depletion of ER-Ca2+, a known mechanism of ER stress induction. The observation that 3-nitrotyrosine-containing proteins colocalize with markers of ER stress within early atherosclerotic lesions suggests that peroxynitrite contributes to atherogenesis through a mechanism involving ER stress.
Key words: endothelium • nitric oxide • endoplasmic reticulum • atherosclerosis • calcium
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