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J Physiol. 2007 Aug 15;583(Pt 1):329-36. Epub 2007 Jun 21.

Soluble erythropoietin receptor is present in the mouse brain and is required for the ventilatory acclimatization to hypoxia.

Author information

1
Institute of Veterinary Physiology, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 260, CH-8057 Zurich, Switzerland, and Center de Recherché, Hôpital St-Francois d'Assise, Quebec, Canada. jsoliz@access.uzh.ch

Erratum in

  • J Physiol. 2007 Oct 15;584(Pt 2)709.
  • Errata. [J Physiol. 2007]

Abstract

While erythropoietin (Epo) and its receptor (EpoR) have been widely investigated in brain, the expression and function of the soluble Epo receptor (sEpoR) remain unknown. Here we demonstrate that sEpoR, a negative regulator of Epo's binding to the EpoR, is present in the mouse brain and is down-regulated by 62% after exposure to normobaric chronic hypoxia (10% O2 for 3 days). Furthermore, while normoxic minute ventilation increased by 58% in control mice following hypoxic acclimatization, sEpoR infusion in brain during the hypoxic challenge efficiently reduced brain Epo concentration and abolished the ventilatory acclimatization to hypoxia (VAH). These observations imply that hypoxic downregulation of sEpoR is required for adequate ventilatory acclimatization to hypoxia, thereby underlying the function of Epo as a key factor regulating oxygen delivery not only by its classical activity on red blood cell production, but also by regulating ventilation.

PMID:
17584830
PMCID:
PMC2277219
DOI:
10.1113/jphysiol.2007.133454
[Indexed for MEDLINE]
Free PMC Article

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