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Molecular and Cellular Biology, November 2004, p. 9414-9423, Vol. 24, No. 21
0270-7306/04/$08.00+0     DOI: 10.1128/MCB.24.21.9414-9423.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Essential Role for Mitochondrial Thioredoxin Reductase in Hematopoiesis, Heart Development, and Heart Function

Marcus Conrad,1,{dagger} Cemile Jakupoglu,1,{dagger} Stéphanie G. Moreno,1 Stefanie Lippl,1 Ana Banjac,1 Manuela Schneider,2 Heike Beck,1 Antonis K. Hatzopoulos,1 Ursula Just,1 Fred Sinowatz,3 Wolfgang Schmahl,4 Kenneth R. Chien,5 Wolfgang Wurst,6 Georg W. Bornkamm,1,{dagger} and Markus Brielmeier2,{dagger}

Institute of Clinical Molecular Biology and Tumour Genetics, GSF Research Centre for Environment and Health,1 Department of Veterinary Anatomy II,3 Institute of Veterinary Pathology, Ludwig-Maximilian University of Munich, Munich,4 Department of Comparative Medicine,2 Institute of Developmental Genetics, GSF Research Centre for Environment and Health, Neuherberg, Germany,6 Institute of Molecular Medicine, University of California at San Diego School of Medicine, La Jolla, California5

Received 18 February 2004/ Returned for modification 21 April 2004/ Accepted 22 July 2004

Oxygen radicals regulate many physiological processes, such as signaling, proliferation, and apoptosis, and thus play a pivotal role in pathophysiology and disease development. There are at least two thioredoxin reductase/thioredoxin/peroxiredoxin systems participating in the cellular defense against oxygen radicals. At present, relatively little is known about the contribution of individual enzymes to the redox metabolism in different cell types. To begin to address this question, we generated and characterized mice lacking functional mitochondrial thioredoxin reductase (TrxR2). Ubiquitous Cre-mediated inactivation of TrxR2 is associated with embryonic death at embryonic day 13. TrxR2TrxR2–/–minus;/TrxR2–/–minus; embryos are smaller and severely anemic and show increased apoptosis in the liver. The size of hematopoietic colonies cultured ex vivo is dramatically reduced. TrxR2-deficient embryonic fibroblasts are highly sensitive to endogenous oxygen radicals when glutathione synthesis is inhibited. Besides the defect in hematopoiesis, the ventricular heart wall of TrxR2TrxR2–/–minus;/TrxR2–/–minus; embryos is thinned and proliferation of cardiomyocytes is decreased. Cardiac tissue-restricted ablation of TrxR2 results in fatal dilated cardiomyopathy, a condition reminiscent of that in Keshan disease and Friedreich's ataxia. We conclude that TrxR2 plays a pivotal role in both hematopoiesis and heart function.

* Corresponding author. Mailing address: Institute of Clinical Molecular Biology and Tumour Genetics, GSF Research Centre for Environment and Health, Marchioninistr. 25, D-81377 Munich, Germany. Phone: 49-89-7099525. Fax: 49-89-7099500. E-mail: marcus.conrad{at}gsf.de.

{dagger} M.C., C.J., G.W.B., and M.B. contributed equally to this study.

Molecular and Cellular Biology, November 2004, p. 9414-9423, Vol. 24, No. 21
0022-538X/04/$08.00+0     DOI: 10.1128/MCB.24.21.9414-9423.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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