Previous Article | Next Article ![]()
Mol. Cell. Biol., 06 1995, 3301-3309, Vol 15, No. 6
C Desdouets, G Matesic, CA Molina, NS Foulkes, P Sassone-Corsi, C Brechot and J Sobczak-Thepot
Cyclin A is a pivotal regulatory protein which, in mammalian cells, is
involved in the S phase of the cell cycle. Transcription of the human
cyclin A gene is cell cycle regulated. We have investigated the role of the
cyclic AMP (cAMP)-dependent signalling pathway in this cell cycle-
dependent control. In human diploid fibroblasts (Hs 27), induction of
cyclin A gene expression at G1/S is stimulated by 8-bromo-cAMP and
suppressed by the protein kinase A inhibitor H89, which was found to delay
S phase entry. Transfection experiments showed that the cyclin A promoter
is inducible by activation of the adenylyl cyclase signalling pathway.
Stimulation is mediated predominantly via a cAMP response element (CRE)
located at positions -80 to -73 with respect to the transcription
initiation site and is able to bind CRE-binding proteins and CRE
modulators. Moreover, activation by phosphorylation of the activators
CRE-binding proteins and CRE modulator tau and levels of the inducible cAMP
early repressor are cell cycle regulated, which is consistent with the
pattern of cyclin A inducibility by cAMP during the cell cycle. These
results suggest that the CRE is, at least partly, implicated in stimulation
of cyclin A transcription at G1/S.
Copyright © 1995, American Society for Microbiology
Cell cycle regulation of cyclin A gene expression by the cyclic AMP- responsive transcription factors CREB and CREM
Institut National de la Sante et de la Recherche Medicale U370, Faculte Necker, Paris, France.
This article has been cited by other articles:
Copyright © 2009 by the American Society for Microbiology. For an alternate route to Journals.ASM.org, visit: http://intl-journals.asm.org | More Info»