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10.1016/j.mvr.2021.104232

http://scihub22266oqcxt.onion/10.1016/j.mvr.2021.104232
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suck abstract from ncbi


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pmid34416267      Microvasc+Res 2021 ; 138 (ä): 104232
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  • Hypoxia alters the expression of ACE2 and TMPRSS2 SARS-CoV-2 cell entry mediators in hCMEC/D3 brain endothelial cells #MMPMID34416267
  • Imperio GE; Lye P; Mughis H; Hamada H; Bloise E; Lye SJ; Matthews SG
  • Microvasc Res 2021[Nov]; 138 (ä): 104232 PMID34416267show ga
  • The mechanisms by which the Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) induces neurological complications remain to be elucidated. We aimed to identify possible effects of hypoxia on the expression of SARS-CoV-2 cell entry mediators, angiotensin-converting enzyme 2 (ACE2) receptor and transmembrane protease serine 2 (TMPRSS2) protein, in human brain endothelial cells, in vitro. hCMEC/D3 cells were exposed to different oxygen tensions: 20% (Control group), 8% or 2% O(2) (Hypoxia groups). Cells were harvested 6-, 24- and 48 h following hypoxic challenge for assessment of mRNA and protein, using qPCR and Western Blot. The response of the brain endothelial cells to hypoxia was replicated using modular incubator chambers. We observed an acute increase (6 h, p < 0.05), followed by a longer-term decrease (48 h, p < 0.05) in ACE2 mRNA and protein expression, accompanied by reduced expression of TMPRSS2 protein levels (48 h, p < 0.05) under the more severe hypoxic condition (2% O(2)). No changes in levels of von Willebrand Factor (vWF - an endothelial cell damage marker) or interleukin 6 (IL-6 - a pro-inflammatory cytokine) mRNA were observed. We conclude that hypoxia regulates brain endothelial cell ACE2 and TMPRSS2 expression in vitro, which may indicate human brain endothelial susceptibility to SARS-CoV-2 infection and subsequent brain sequelae.
  • |*Virus Internalization[MESH]
  • |Angiotensin-Converting Enzyme 2/genetics/*metabolism[MESH]
  • |Brain/*blood supply[MESH]
  • |COVID-19/enzymology/*virology[MESH]
  • |Cell Hypoxia[MESH]
  • |Cell Line[MESH]
  • |Endothelial Cells/enzymology/*virology[MESH]
  • |Gene Expression Regulation[MESH]
  • |Host-Pathogen Interactions[MESH]
  • |Humans[MESH]
  • |SARS-CoV-2/*pathogenicity[MESH]


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