Physiological cyclic strain promotes endothelial cell survival via the induction of heme oxygenase-1

被引:43
|
作者
Liu, Xiao-ming [1 ]
Peyton, Kelly J. [1 ]
Durante, William [1 ]
机构
[1] Univ Missouri, Dept Med Pharmacol & Physiol, Columbia, MO 65212 USA
来源
AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY | 2013年 / 304卷 / 12期
关键词
vascular biology; hemodynamic forces; endothelium; VASCULAR SMOOTH-MUSCLE; CARBON-MONOXIDE; INHIBITS APOPTOSIS; OXIDATIVE STRESS; MECHANICAL-PROPERTIES; GENE; ACTIVATION; EXPRESSION; AKT; PROLIFERATION;
D O I
10.1152/ajpheart.00872.2012
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
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 anti-oxidant 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 Nacetyl-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.
引用
收藏
页码:H1634 / H1643
页数:10
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