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- W1656979455 abstract "Hypoxia is a diminution of oxygen quantity delivered to tissue for cellular need to product energy. Hypoxia derives from two major conditions in health diseases: anemia and ischemia. Anemic hypoxia comes from damage to O(2) transport like red blood cells diminution or disease. Ischemic hypoxia is a diminution of blood flow following a diminution of blood volume after a hemorrhagic shock. After hypoxia, vessels dilate to increase blood flow allowing a better oxygenation of peripheral tissues. This vasodilation appears immediately after the beginning of hypoxia and can be maintained during several hours. Today, the molecular mechanisms of this vasodilation stay unclear. But it seems that potassic channels, ATP concentration and medium acidification in addition to vasodilator/vasoconstrictor balance play a great role to facilitate the oxygenation of the ischemic areas.As endothelial cells (EC) are lining the vasculature, they are always in contact with blood, which carries, amongst other compounds, oxygen. In this way, they are the first target for an oxygen partial pressure (PO(2)) diminution. EC, through different mechanosensors, can sense a variation in PO(2) and adapt their metabolism to maintain ATP production. Under hypoxia, EC switch into hypoxic metabolism, leading to the production of reactive oxygen species (ROS). Indeed, when PO(2) is low, the respiratory chain in the mitochondria runs slower. Furthermore, cytochrome C capacity to trap O(2) is reduced; this phenomenon alters the cellular redox potential and leads to the accumulation of electrons that induce the formation of ROS.This review presents an overview of the behaviour of endothelial cells face to hypoxia. We propose to focus on nitric oxide, hypoxia inducible factor (HIF), lactate and ROS productions. Then we present the different mode of culture of EC under hypoxia. Finally, we conclude on the difficulty to study hypoxia because of the various types of system developed to reproduce this phenomenon and the different signalling ways that can be activated." @default.
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- W1656979455 date "2008-01-01" @default.
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- W1656979455 title "Review: Behaviour of endothelial cells faced with hypoxia" @default.
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- W1656979455 doi "https://doi.org/10.3233/bme-2008-0541" @default.
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