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Molecular and Cellular Biology, April 2001, p. 2933-2943, Vol. 21, No. 8
Interfakultäres Institut für
Zellbiologie, Abteilung Molekularbiologie, Universität
Tübingen, 72076 Tübingen,1
Institut für Molekularbiologie, Medizinische Hochschule
Hannover, 30625 Hannover,2
Max-Planck-Institut für Entwicklungsbiologie, 72074 Tübingen,4 and Entwicklungs- und
Molekularbiologie der Tiere, Heinrich Heine Universität, 40225 Düsseldorf, Germany,5 and
Whitehead Institute for Biomedical Research and
Massachusetts Institute of Technology, Cambridge, Massachusetts
02142-14793
Received 20 November 2000/Returned for modification 10 January
2001/Accepted 26 January 2001
Addition of serum to mitogen-starved cells activates the cellular
immediate-early gene (IEG) response. Serum response factor (SRF)
contributes to such mitogen-stimulated transcriptional induction of
many IEGs during the G0-G1 cell cycle
transition. SRF is also believed to be essential for cell cycle
progression, as impairment of SRF activity by specific antisera or
antisense RNA has previously been shown to block mammalian cell
proliferation. In contrast, Srf
0270-7306/01/$04.00+0 DOI: 10.1128/MCB.21.8.2933-2943.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Serum Response Factor Is Required for
Immediate-Early Gene Activation yet Is Dispensable for Proliferation
of Embryonic Stem Cells

/
mouse
embryos grow and develop up to E6.0. Using the embryonic stem (ES) cell
system, we demonstrate here that wild-type ES cells do not undergo
complete cell cycle arrest upon serum withdrawal but that they can
mount an efficient IEG response. This IEG response, however, is
severely impaired in Srf
/
ES cells,
providing the first genetic proof that IEG activation is dependent upon
SRF. Also, Srf
/
ES cells display altered
cellular morphology, reduced cortical actin expression, and an impaired
plating efficiency on gelatin. Yet, despite these defects, the
proliferation rates of Srf
/
ES cells are
not substantially altered, demonstrating that SRF function is not
required for ES cell cycle progression.
*
Corresponding author. Mailing address:
Interfakultäres Institut für Zellbiologie, Abteilung
Molekularbiologie, Universität Tübingen, Auf der
Morgenstelle 15, 72076 Tübingen, Germany. Phone:
49-7071-297 8898. Fax: 49-7071-295359. E-mail:
alfred.nordheim{at}uni-tuebingen.de.
Present address: Institut für Medizinische Mikrobiologie,
Medizinische Hochschule Hannover, 30625 Hannover, Germany.
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