[No authors listed]
OBJECTIVE:Earlier studies from our group using hypoxia-inducible factor 3α knockout mice showed impairments in lung remodeling and lung endothelial cells. Another research from our group demonstrated that impaired expression of hypoxia-inducible factor 2α induced compensatory expression of hypoxia-inducible factor 1α in hypoxia-inducible factor 2α knockdown mice. The present study uncovers more insights by extending the investigation, utilizing mice with both hypoxia-inducible factor 3α knockout and hypoxia-inducible factor 2α knockdown. RESULTS:No mice with both hypoxia-inducible factor 3α knockout and hypoxia-inducible factor 2α knockdown died immediately after birth. The mice with both hypoxia-inducible factor 3α knockout and hypoxia-inducible factor 2α knockdown exhibited impaired alveolar sacs and lung alveolar structure and decreased endothelial cell numbers. Analysis of relative mRNA expression revealed depressed expressions of hypoxia-inducible factor 1α, vascular cell adhesion molecule 1, vascular endothelial cadherin, angiopoietin 2, Tie-2, and vascular endothelial growth factor in the lungs of mice with both hypoxia-inducible factor 3α knockout and hypoxia-inducible factor 2α knockdown compared to that in wild-type mice. Further analysis is needed to elucidate the impaired development occurred in the lung endothelial cells.
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