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Molecular and Cellular Biology, April 2000, p. 2890-2901, Vol. 20, No. 8
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
17
-Estradiol Inhibits Apoptosis in MCF-7 Cells,
Inducing bcl-2 Expression via Two Estrogen-Responsive
Elements Present in the Coding Sequence
Bruno
Perillo,1,*
Annarita
Sasso,1
Ciro
Abbondanza,2 and
Giuseppe
Palumbo1
Centro di Endocrinologia ed Oncologia
Sperimentale del C.N.R., Dipartimento di Biologia e Patologia Cellulare
e Molecolare "L. Califano", Facoltà di Medicina e Chirurgia,
Università "Federico II", 80131 Naples,1 and Istituto di Patologia Generale
ed Oncologia, Facoltà di Medicina e Chirurgia, Seconda
Università di Napoli, 80138 Naples,2 Italy
Received 9 August 1999/Returned for modification 21 September
1999/Accepted 17 January 2000
We have found that 17
-estradiol induces bcl-2
transcription in human breast cancer MCF-7 cells. To identify
cis-acting elements involved in this regulation, we have
analyzed hormone responsiveness of transiently transfected reporter
constructs containing the bcl-2 major promoter
(P1). Hormone inducibility was observed only when either of
two sequences, located within the bcl-2 coding region and
showing one and two mutations with respect to the consensus estrogen-responsive element, were inserted downstream from the P1 promoter. Both sequences behaved as enhancers
exclusively in cells expressing the estrogen receptor and were able to
bind this receptor in in vitro assays. Transfections into MCF-7 cells
of plasmids carrying a bcl-2 cDNA fragment which
included these two elements revealed that their simultaneous presence
resulted in an additive effect on reporter gene activity, whose size
resembled the increase of endogenous bcl-2 mRNA level
observed in untransfected cells after hormone treatment.
Moreover, the identified elements were able to mediate up-regulation of
bcl-2 expression by 17
-estradiol, since exogenous
bcl-2 mRNA was induced by hormone challenge of MCF-7 cells
transiently transfected with a vector containing the bcl-2
coding sequence cloned under the control of a non-estrogen-responsive promoter. Finally, we show that hormone prevention of apoptosis, induced by incubating MCF-7 cells with hydrogen peroxide, was strictly
related to bcl-2 up-regulation. Our results indicate that
the bcl-2 major promoter does not contain
cis-acting elements directly involved in transcriptional
control by 17
-estradiol and that hormone treatment inhibits
programmed cell death in MCF-7 cells, inducing bcl-2
expression via two estrogen-responsive elements located within its
coding region.
*
Corresponding author. Mailing address: Area della
Ricerca
C.N.R., via P. Castellino, 111-80131 Naples, Italy. Phone:
(39-081) 5797835. Fax: (39-081) 5607593. E-mail:
perillo{at}unina.it.
Molecular and Cellular Biology, April 2000, p. 2890-2901, Vol. 20, No. 8
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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