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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Physiol+Heart+Circ+Physiol
2013 ; 304
(12
): H1634-43
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Physiological cyclic strain promotes endothelial cell survival via the induction
of heme oxygenase-1
#MMPMID23604711
Liu XM
; Peyton KJ
; Durante W
Am J Physiol Heart Circ Physiol
2013[Jun]; 304
(12
): H1634-43
PMID23604711
show ga
Endothelial cells (ECs) are constantly subjected to cyclic strain that arises
from periodic change in vessel wall diameter as a result of pulsatile blood flow.
Application of physiological levels of cyclic strain inhibits EC apoptosis;
however, the underlying mechanism is not known. Since heme oxygenase-1 (HO-1) is
a potent inhibitor of apoptosis, the present study investigated whether HO-1
contributes to the antiapoptotic action of cyclic strain. Administration of
physiological cyclic strain (6% at 1 Hz) to human aortic ECs stimulated an
increase in HO-1 activity, protein, and mRNA expression. The induction of HO-1
was preceded by a rise in reactive oxygen species (ROS) and Nrf2 protein
expression. Cyclic strain also stimulated an increase in HO-1 promoter activity
that was prevented by mutating the antioxidant responsive element in the promoter
or by overexpressing dominant-negative Nrf2. In addition, the strain-mediated
induction of HO-1 and activation of Nrf2 was abolished by the antioxidant
N-acetyl-l-cysteine. Finally, application of cyclic strain blocked inflammatory
cytokine-mediated EC death and apoptosis. However, the protective action of
cyclic strain was reversed by the HO inhibitor tin protoporphyrin-IX and was
absent in ECs isolated from HO-1-deficient mice. In conclusion, the present study
demonstrates that a hemodynamically relevant level of cyclic strain stimulates
HO-1 gene expression in ECs via the ROS-Nrf2 signaling pathway to inhibit EC
death. The ability of cyclic strain to induce HO-1 expression may provide an
important mechanism by which hemodynamic forces promote EC survival and vascular
homeostasis.