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Mol. Cell. Biol., Dec 1995, 6496-6505, Vol 15, No. 12
RR Beerli, D Graus-Porta, K Woods-Cook, X Chen, Y Yarden and NE Hynes
Neu differentiation factor (NDF)-induced signaling involves the activation
of members of the ErbB family of receptor tyrosine kinases. Although
ectopic expression of recombinant ErbB receptors has yielded valuable
insight into their signaling properties, the biological function and in
vivo interplay of these receptors are still poorly understood. We addressed
this issue by studying NDF signaling in various human cell lines expressing
moderate levels of all known ErbB receptors. NDF-induced phosphorylation of
ErbB-2 and ErbB-3 was found in the breast epithelial cell line MCF10A, the
breast tumor cell lines T47D and MCF7, and the ovarian tumor cell line
OVCAR3. Despite similar expression levels, NDF-induced phosphorylation of
ErbB-4 was cell specific and only detected in T47D and OVCAR3 cells.
Blocking cell surface expression of ErbB-2 by intracellular expression of a
single- chain antibody revealed that in these two cell lines, ErbB-2
significantly enhanced phosphorylation of ErbB-4. Efficient NDF-induced
phosphorylation of ErbB-3 was strictly ErbB-2 dependent in the breast tumor
cell lines T47D and MCF7, while it was largely ErbB-2 independent in MCF10A
and OVCAR3 cells. Consequently, NDF-stimulated intracellular signaling and
induction of a biological response displayed a cell- specific requirement
for ErbB-2. Thus, while ErbB-2 cooperates with NDF receptors in the breast
tumor cell lines, ErbB-2 independent mechanisms seem to prevail in other
cellular contexts.
Copyright © 1995, American Society for Microbiology
Neu differentiation factor activation of ErbB-3 and ErbB-4 is cell specific and displays a differential requirement for ErbB-2
Friedrich Miescher-Institut, Basel, Switzerland.
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