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Regulation of Phosphorylation of the c-erbB-2/HER2 Gene Product by a Monoclonal Antibody and Serum Growth Factor(s)

By In Human Mammary Carcinoma Cells, Rakesh Kumar, H. Michael Shepard and John Mendelsohn


Monoclonal antibody (MAb) 4D5 was used to analyze the phosphorylation of p185HER, the gene product of c-erbB-21HER2, in SK-BR-3 cells. Culture in the continuous presence of 4D5 reduced the in vivo steady-state levels of p185HER2 phosphorylation by 80 % in a dose-dependent manner, suggesting that MAb 4D5 may have interfered with the activation of phosphorylation of p185HER2. The observed MAb-mediated reduction of pl85HER2 phosphorylation could not be completely accounted for by down-regulation. When cultures were grown under serum-free conditions, the steady-state levels of pl85HER2 phosphorylation were reduced by 56%, and addition of 4D5 further inhibited phosphorylation to 20 % of steady-state levels. With continuous exposure to increasing concentrations of newborn calf serum in these cultures, there was a linear increase in tyrosine-specific phosphorylation of p185HER2, reaching a 5.4-fold increase with 10 % newborn calf serum. Phosphorylation of p185HER2 in the presence of newborn calf serum was not attributable to stimulation of the epidermal growth factor receptor by epidermal growth factor or by transforming growth factor-a. Extension of these observations to two other mammary carcinoma cell lines, MDA-MB-453 and BT-474, also demon-strated a significant capacity of serum to induce pl85HER2 phosphorylation. The demonstration of antibody-mediated partial inhibition of phosphorylation under serum-free conditions suggests that mammary carcinoma cells may also produce and secrete a factor or factors which may activate p185HER2. Our observation tha

Year: 1990
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