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In addition to nitric oxide and carbon monoxide, hydrogen sulfide (H(2)S) is an endogenously synthesized gaseous molecule that acts as an important signaling molecule in the living body. Transcription factor hypoxia-inducible factor 1 (HIF-1) is known to respond to intracellular reduced oxygen (O(2)) availability, which is regulated by an elaborate balance between O(2) supply and demand. However, the effect of H(2)S on HIF-1 activity under hypoxic conditions is largely unknown in mammalian cells. In this study, we tried to elucidate the effect of H(2)S on hypoxia-induced HIF-1 activation adopting cultured cells and mice.

antioxidants and redox signaling

Hydrogen Sulfide Inhibits Hypoxia- But Not Anoxia-Induced Hypoxia-Inducible Factor 1 Activation in a von Hippel-Lindau- and Mitochondria-Dependent Manner