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Blood, 1 September 2008, Vol. 112, No. 5, pp. 2071-2080.
Prepublished online as a Blood First Edition Paper on June 13, 2008; DOI 10.1182/blood-2007-12-127480.
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Submitted December 5, 2007
Accepted May 1, 2008
Hematopoietic-specific Stat5-null mice display microcytic hypochromic anemia associated with reduced transferrin receptor gene expression
Bing-Mei Zhu, Sara K. McLaughlin, Risu Na, Jie Liu, Yongzhi Cui, Cyril Martin, Akiko Kimura, Gertraud W. Robinson, Nancy C. Andrews, and Lothar Hennighausen*
Laboratory of Genetics and Physiology/NIDDK, National Institutes of Health, Bethesda, MD, United States
Children's Hospital Boston, Harvard Medical School, Boston, MA, United States
ImmunoTechnology Section, Vaccine Research Center, National Institute of Allergy and Infectious Diseases, NIH, Bethesda, MD, United States
Department of Pharmacology and Cancer Biology and Department of Pediatrics, Duke University School of Medicine, Durham, NC, United States
* Corresponding author; email: lotharh{at}mail.nih.gov.
Iron is essential for all cells but is toxic in excess, so iron absorption and distribution are tightly regulated. Serum iron is bound to transferrin and primarily enters erythroid cells via receptor-mediated endocytosis of the transferrin receptor (Tfr1). Tfr1 is essential for developing erythrocytes and reduced Tfr1 expression is associated with anemia. The transcription factors STAT5A/B are activated by many cytokines, including erythropoietin. Stat5a/b-/- mice are severely anemic and die perinatally, but no link has been made to iron homeostasis. To study the function of STAT5A/B in vivo, we deleted the floxed Stat5a/b locus in hematopoietic cells with a Tie2-Cre transgene. These mice exhibited microcytic, hypochromic anemia, as did lethally irradiated mice transplanted with Stat5a/b-/- fetal liver cells. Flow cytometry and RNA analyses of erythroid cells from mutant mice revealed a 50% reduction in Tfr1 mRNA and protein. We detected STAT5A/B binding sites in the first intron of the Tfr1 gene and found that expression of constitutively active STAT5A in an erythroid cell line induced Tfr1 levels. Chromatin immunoprecipitation experiments confirmed the binding of STAT5A/B to these sites. We conclude that STAT5A/B is an important regulator of erythroid progenitor iron uptake via its control of Tfr1 transcription.
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