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Blood, 1 June 2007, Vol. 109, No. 11, pp. 4724-4731. Prepublished online as a Blood First Edition Paper on February 20, 2007; DOI 10.1182/blood-2006-08-040006. This Article Full Text (PDF) All Versions of this Article: blood-2006-08-040006v1 109/11/4724    most recent Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Rights and Permissions Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Robach, P. Articles by Lundby, C. Search for Related Content PubMed PubMed Citation Articles by Robach, P. Articles by Lundby, C. Related Collections Related Article in Blood Online Social Bookmarking                   What's this?  Previous Article  |  Next Article  Submitted August 7, 2006 Accepted January 26, 2007 Strong iron demand during hypoxia-induced erythropoiesis is associated with down-regulation of iron-related proteins and myoglobin in human skeletal muscle Paul Robach, Gaetano Cairo*, Cecilia Gelfi, Francesca Bernuzzi, Henriette Pilegaard, Agnese Vigano, Paolo Santambrogio, Paolo Cerretelli, Jose A. L. Calbet, Stephane Moutereau, and Carsten Lundby Departement medical, Ecole Nationale de Ski et d'Alpinisme, Chamonix, France Institute of General Pathology, University of Milano, Milano, Italy Department of Sciences and Biomedical Technologies, University of Milano, Segrate, Italy Copenhagen Muscle Research Centre and Centre of Inflammation, Metabolism, Institute of Molecular Biology & Physiology, University of Copenhagen, Copenhagen, Denmark Protein Engineering Unit, Dibit, IRCCS H.S. Raffaele, Milano, Italy Department of Physical Education, University of Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain Laboratoire de Biochimie, Hopital Henri-Mondor, Creteil, France Department of Sport Science, University of Arhus, Arhus, Denmark * Corresponding author; email: gaetano.cairo{at}unimi.it. Iron is essential for oxygen transport because it is incorporated in the heme of oxygen-binding proteins hemoglobin and myoglobin. An interaction between iron homeostasis and oxygen regulation is further suggested during hypoxia, where hemoglobin and myoglobin syntheses have been reported to increase. This study gives new insights into the changes in iron content and iron-oxygen interactions during enhanced erythropoiesis by simultaneously analyzing blood and muscle samples in humans exposed to 7-9 days of high altitude (HA) hypoxia. HA up-regulates iron acquisition by erythroid cells, mobilizes body iron and increases hemoglobin concentration. However, contrary to our hypothesis that muscle iron proteins and myoglobin would also be up-regulated during HA, this study shows that HA lowers myoglobin expression by 35% and down-regulates iron-related proteins in skeletal muscle, as evidenced by decreases in L-ferritin (43%), transferrin receptor (TfR) (50%), and total iron content (37%). This parallel decrease in L-ferritin and TfR in HA occurs independently of increased HIF-1 mRNA levels and unchanged binding activity of iron regulatory proteins, but concurrently with increased ferroportin mRNA levels, suggesting enhanced iron export. Thus, in HA, the elevated iron requirement associated with enhanced erythropoiesis presumably elicits iron mobilization and myoglobin down-modulation, suggesting an altered muscle oxygen homeostasis. CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this? Related Article in Blood Online: Trading muscle iron for erythropoiesis at high altitude Chaim Hershko Blood 2007 109: 4597. [Full Text] [PDF] This article has been cited by other articles: C. Lundby, Y. Hellsten, M. B. F. Jensen, A. S. Munch, and H. Pilegaard Erythropoietin receptor in human skeletal muscle and the effects of acute and long-term injections with recombinant human erythropoietin on the skeletal muscle J Appl Physiol, April 1, 2008; 104(4): 1154 - 1160. [Abstract] [Full Text] [PDF]

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