Abstract
Endothelial cells in vivo are constantly exposed to shear associated with blood flow and altered shear stress elicits cellular responses (mechanotransduction). This review describes the role of shear sensors and signal transducers in these events. The major focus is the response to removal of shear as occurs when blood flow is compromised (i.e., ischemia). Pulmonary ischemia studied with the isolated murine lung or flow adapted pulmonary microvascular endothelial cells in vitro results in endothelial generation of reactive oxygen species (ROS) and NO. The response requires caveolae and is initiated by endothelial cell depolarization via KATP channel closure followed by activation of NADPH oxidase (NOX2) and NO synthase (eNOS), signaling through MAP kinases, and endothelial cell proliferation. These physiological mediators can promote vasodilation and angiogenesis as compensation for decreased tissue perfusion.
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Acknowledgments
We thank Susan Turbitt for secretarial support and the many collaborators who have contributed to this research during the past 20 years. Original research has been supported by the NHLBI (HL79063, HL60290, and HL41939).
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Chatterjee, S., Chapman, K.E. & Fisher, A.B. Lung Ischemia: A Model for Endothelial Mechanotransduction. Cell Biochem Biophys 52, 125–138 (2008). https://doi.org/10.1007/s12013-008-9030-7
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DOI: https://doi.org/10.1007/s12013-008-9030-7