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J. Biol. Chem., Vol. 276, Issue 21, 17864-17870, May 25, 2001
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§,
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From the We show here that the neurotrophin nerve growth
factor (NGF), which has been shown to be a mitogen for breast cancer
cells, also stimulates cell survival through a distinct
signaling pathway. Breast cancer cell lines (MCF-7, T47-D, BT-20, and
MDA-MB-231) were found to express both types of NGF receptors:
p140trkA and p75NTR. The two other tyrosine
kinase receptors for neurotrophins, TrkB and TrkC, were not expressed.
The mitogenic effect of NGF on breast cancer cells required the
tyrosine kinase activity of p140trkA as well as the
mitogen-activated protein kinase (MAPK) cascade, but was
independent of p75NTR. In contrast, the anti-apoptotic
effect of NGF (studied using the ceramide analogue C2) required
p75NTR as well as the activation of the transcription
factor NF-kB, but neither p140trkA nor MAPK was necessary.
Other neurotrophins (BDNF, NT-3, NT-4/5) also induced cell survival,
although not proliferation, emphasizing the importance of
p75NTR in NGF-mediated survival. Both the pharmacological
NF-
Equipe Facteurs de Croissance, UPRES
EA-1033 Biologie du Développement, Université des Sciences
et Technologies de Lille, 59655 Villeneuve d' ASCQ France, the
¶ Immunopathologie Cellulaire des Maladies Infectieuses, CNRS, UMR
8527, Institut de Biologie de Lille, 59000 France, the ** Department of
Anatomical Sciences, University of Queensland, St. Lucia,
Queensland 4072, Australia, and the
Laboratoire
d'Oncologie Moléculaire Humaine, Centre Oscar Lambret, 59020 Lille, France
B inhibitor SN50, and cell transfection with IkBm, resulted in a
diminution of NGF anti-apoptotic effect. These data show that two
distinct signaling pathways are required for NGF activity and confirm
the roles played by p75NTR and NF-
B in the activation of
the survival pathway in breast cancer cells.

To whom correspondence should be addressed:
EA-1033, batiment SN3, Université des Sciences et Technologies de
Lille, 59655 Villeneuve d'Ascq cedex, France. Tel.:
33-3-20-43-40-97; Fax: 33-3-20-43-40-38; E-mail:
hubert.hondermarck@univ-lille1.fr.
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