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Induction and Analysis of Epithelial to Mesenchymal Transition
Published on: August 27, 2013
Heregulin-dependent translocation and hyperphosphorylation of ErbB-2
1Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee, TN 37232-0146, USA.
Abstract:
Previous data have shown that in several tumor cells lines the addition of heregulin results in the translocation of ErbB-4 to a detergent-insoluble membrane fraction where it is hypertyrosine phosphorylated. The data herein demonstrate that heregulin or betacellulin, but not EGF, promotes the rapid translocation of ErbB-2, the heterodimerization partner for ErbB-4, to the same detergent-insoluble fraction in T47 D mammary carcinoma cells. The translocation of ErbB-2 and ErbB-4, but not ErbB-3, to this detergent-insoluble fraction is readily detected 2 min after the addition of heregulin. ErbB-2 present in this detergent-insoluble membrane fraction is tyrosine phosphorylated to a level fourfold greater than the majority of cellular ErbB-2 present in the detergent-soluble membrane fraction. These results suggest the ligand-dependent formation of hyperphosphorylated ErbB-4/ErbB-2 dimers coordinate with translocation to a putative membrane microdomain.
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