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Mol. Cell. Biol., 11 1996, 6065-6074, Vol 16, No. 11
M Soulez, CG Rouviere, P Chafey, D Hentzen, M Vandromme, N Lautredou, N Lamb, A Kahn and D Tuil
In order to study to what extent and at which stage serum response factor
(SRF) is indispensable for myogenesis, we stably transfected C2 myogenic
cells with, successively, a glucocorticoid receptor expression vector and a
construct allowing for the expression of an SRF antisense RNA under the
direction of the mouse mammary tumor virus long terminal repeat. In the
clones obtained, SRF synthesis is reversibly down- regulated by induction
of SRF antisense RNA expression by dexamethasone, whose effect is
antagonized by the anti-hormone RU486. Two kinds of proliferation and
differentiation patterns have been obtained in the resulting clones. Some
clones with a high level of constitutive SRF antisense RNA expression are
unable to differentiate into myotubes; their growth can be blocked by
further induction of SRF antisense RNA expression by dexamethasone. Other
clones are able to differentiate and are able to synthesize SRF, MyoD,
myogenin, and myosin heavy chain at confluency. When SRF antisense RNA
expression is induced in proliferating myoblasts by dexamethasone
treatment, cell growth is blocked and cyclin A concentration drops. When
SRF antisense RNA synthesis is induced in arrested confluent myoblasts
cultured in a differentiation medium, cell fusion is blocked and synthesis
of not only SRF but also MyoD, myogenin, and myosin heavy chain is
inhibited. Our results show, therefore, that SRF synthesis is indispensable
for both myoblast proliferation and myogenic differentiation.
Copyright © 1996, American Society for Microbiology
Growth and differentiation of C2 myogenic cells are dependent on serum response factor
Institut Cochin de Genetique Moleculaire, U129 Institut National de la Sante et de la Recherche Medicale, Paris, France.
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