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First published online 24 July 2008
doi: 10.1242/jcs.027599

Journal of Cell Science 121, 2629-2634 (2008)
Published by The Company of Biologists 2008
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Short Report

Klf5 is involved in self-renewal of mouse embryonic stem cells

Silvia Parisi1,2,*, Fabiana Passaro1,3,*, Luigi Aloia1,2, Ichiro Manabe4, Ryozo Nagai5, Lucio Pastore1,3 and Tommaso Russo1,3,{ddagger}

1 CEINGE Biotecnologie Avanzate, 80145 Napoli, Italy
2 European School of Molecular Medicine, SEMM, 80145 Napoli, Italy
3 Dipartimento di Biochimica e Biotecnologie Mediche, Università di Napoli Federico II, 80131 Napoli, Italy
4 Nano-Bioengineering Education Program, The University of Tokyo Graduate School of Medicine, 7-3-1 Hongo, Bunkyo, Tokyo 113-8655, Japan
5 Department of Cardiovascular Medicine, The University of Tokyo Graduate School of Medicine, 7-3-1 Hongo, Bunkyo, Tokyo 113-8655, Japan

{ddagger} Author for correspondence (e-mail: russot{at}dbbm.unina.it)

Accepted 15 May 2008

Summary

Self-renewal of embryonic stem cells (ESCs) is maintained by a complex regulatory mechanism involving transcription factors Oct3/4 (Pou5f1), Nanog and Sox2. Here, we report that Klf5, a Zn-finger transcription factor of the Kruppel-like family, is involved in ESC self-renewal. Klf5 is expressed in mouse ESCs, blastocysts and primordial germ cells, and its knockdown by RNA interference alters the molecular phenotype of ESCs, thereby preventing their correct differentiation. The ability of Klf5 to maintain ESCs in the undifferentiated state is supported by the finding that differentiation of ESCs is prevented when Klf5 is constitutively expressed. Maintenance of the undifferentiated state by Klf5 is, at least in part, due to the control of Nanog and Oct3/4 transcription, because Klf5 directly binds to the promoters of these genes and regulates their transcription.

Key words: Differentiation, Kruppel-like factors, Nanog, Oct3/4, Self-renewal


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