HIF1A-AS2 Regulates Hypoxia-Driven HIF Isoform Switching in Human Endothelial Cells

HIF1A-AS2 is strongly upregulated by hypoxia in human endothelial cells and is linked to reduced HIF1A mRNA, while EPAS1 stays stable.

• Why it matters: The hypoxia-driven switch from HIF-1 to HIF-2 is central to adaptation, but how this transition is regulated in endothelial cells remains unclear.
• What they did: Genome-wide profiling and EC-type comparisons were combined with HIF1A-AS2 silencing to test effects on HIF1A, HIF-1/HIF-2 activity, and downstream VEGFA and GLUT1 expression.
• The result: HIF1A-AS2 knockdown partially restored HIF1A expression and increased HIF-1 protein and activity, and cancer tissues showed frequent HIF1A-AS2 downregulation associated with higher HIF1A and EPAS1.

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