Hypoxia up-regulates hypoxia-inducible factor-1α transcription by involving phosphatidylinositol 3-kinase and nuclear factor κB in pulmonary artery smooth muscle cells - Belaiba, R S; Bonello, S; Zahringer, C; Schmidt, S; Hess, J; Kietzmann, T; Gorlach, A (Mol Biol Cell, 2007)