The neurohormone orexin stimulates hypoxia-inducible factor-1 activity.

The neurohormone orexin stimulates hypoxia-inducible factor-1 activity. Research Abstract Details 

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The neurohormone orexin stimulates hypoxia-inducible factor-1 activity. Abstract Text:

Devanjan Sikder,Thomas Kodadek,Devanjan Sikder,Thomas Kodadek,

Orexin A and Orexin B (also known as hypocretins) are neuropeptides that bind two related G-coupled protein receptors (OXR1 and OXR2) and thus induce wakefulness, food consumption, and locomotion. Conversely, deletion of the orexin gene in mice produces a condition similar to canine and human narcolepsy. Despite the central importance of the orexin system in regulating wakefulness and feeding behavior, little is known about the downstream signaling mechanisms that achieve these effects. In this study, genomics techniques are used to probe this question and reveal that orexin activates the hypoxia-inducible factor 1 (HIF-1), a heterodimeric transcription factor whose pathogenic role in stimulating angiogenesis in hypoxic tumors has been the focus of intense investigation. Orexin-stimulated HIF-1 activity is due to both increased HIF-1alpha gene transcription and a down-regulation of von Hippel-Lindau (VHL), the E3 ubiquitin ligase that mediates the turnover of HIF-1 via the ubiquitin-proteasome pathway. Orexin-mediated activation of HIF-1 results in increased glucose uptake and higher glycolytic activity, as expected from studies of hypoxic cells. However, orexin receptor-expressing cells somehow override the HIF-1-mediated preference for funneling pyruvate into anaerobic glycolysis and instead favor ATP production through the tricarboxylic acid cycle and oxidative phosphorylation. These findings implicate HIF-1 as an important transcription factor in the hormone-mediated regulation of hunger and wakefulness.

The neurohormone orexin stimulates hypoxia-inducible factor-1 activity. Publishing Authors By Initials

D Sikder,T Kodadek,D Sikder,T Kodadek,

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The neurohormone orexin stimulates hypoxia-inducible factor-1 activity. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Genes & development

VOLUME: 21

Page Numbers: 2995-3005

Journal Abbreviation: Genes Dev.

ISSN: 0890-9369

DAY: 15

MONTH: Nov

YEAR: 2007

The neurohormone orexin stimulates hypoxia-inducible factor-1 activity. Information

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LANGUAGE: eng

NlmUniqueID: 8711660

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Grant and Affiliation Information for The neurohormone orexin stimulates hypoxia-inducible factor-1 activity.

AFFILIATION: Division of Translational Research, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9185, USA.

Country: United States

AGENCY: United States NHLBI

GRANT: N01-HV-28185

ACRONYM: HV

MEDLINETA: Genes Dev

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