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- W3201118669 abstract "The collective migration of vascular endothelial cells plays important roles in homeostasis and angiogenesis. Oxygen concentration in vivo, which is lower than in the atmosphere and changes due to diseases, is a key factor affecting the cellular dynamics of vascular endothelial cells. We previously reported that hypoxic conditions promote the internalization of vascular endothelial (VE)-cadherin, a specific cell-cell adhesion molecule, and increase the velocity of the collective migration of vascular endothelial cells. However, the mechanism through which cells regulate collective migration as affected by oxygen tension is not fully understood. Here, we investigated oxygen-dependent collective migration, focusing on intracellular protein p21-activated kinase (PAK) and hypoxia-inducing factor (HIF)-1α. A monolayer of human umbilical vein vascular endothelial cells (HUVECs) was formed in a microfluidic device with controllability of oxygen tension. The HUVECs were then exposed to various oxygen conditions in a range from 0.8% to 21% O2, with or without PAK inhibition or chemical stabilization of HIF-1α. Collective cell migration was measured by particle image velocimetry with time-lapse phase-contrast microscopic images. Localizations of VE-cadherin and HIF-1α were quantified by immunofluorescent staining. The collective migration of HUVECs varied in an oxygen-dependent fashion; the migration speed was increased by hypoxic exposure down to 1% O2, while it decreased under an extremely low oxygen tension of less than 1% O2. PAK inhibition suppressed the hypoxia-induced increase of the migration speed by preventing VE-cadherin internalization into HUVECs. A decrease in the migration speed was also obtained by chemical stabilization of HIF-1α, suggesting that excessive accumulation of HIF-1α diminishes collective cell migration. These results indicate that the oxygen-dependent variation of the migration speed of vascular endothelial cells is mediated by the regulation of VE-cadherin through the PAK pathway, as well as other mechanisms via HIF-1α, especially under extreme hypoxic conditions." @default.
- W3201118669 created "2021-09-27" @default.
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- W3201118669 date "2021-01-01" @default.
- W3201118669 modified "2023-09-24" @default.
- W3201118669 title "P21-activated kinase regulates oxygen-dependent migration of vascular endothelial cells in monolayers" @default.
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- W3201118669 doi "https://doi.org/10.1080/19336918.2021.1978368" @default.
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