ALK receptor tyrosine kinase promotes cell growth and neurite outgrowth.
Anaplastic lymphoma kinase (ALK) is a receptor-type protein tyrosine kinase that is expressed preferentially in neurons of the central and peripheral nervous systems at late embryonic stages. To elucidate the role of ALK in neurons, we developed an agonist monoclonal antibody (mAb) against the extracellular domain of ALK. Here we ... show that mAb16-39 elicits tyrosine phosphorylation of endogenously expressed ALK in human neuroblastoma (SK-N-SH) cells. Stimulation of these cells with mAb16-39 markedly induces the tyrosine phosphorylation of insulin receptor substrate-1 (IRS-1), Shc, and c-Cbl and also their interaction with ALK and activation of ERK1/2. Furthermore, we show that continuous incubation with mAb16-39 induces the cell growth and neurite outgrowth of SK-N-SH cells. These responses are completely blocked by MEK inhibitor PD98059 but not by the phosphatidylinositol 3-kinase (PI 3-kinase) inhibitor wortmannin, indicating an essential role of the mitogen-activated protein kinase (MAP kinase) signaling cascade in ALK-mediated growth and differentiation of neurons.
Mesh Terms:
Adaptor Proteins, Signal Transducing, Animals, Antibodies, Monoclonal, Cell Line, Cell Line, Tumor, Cell Proliferation, DNA, Dose-Response Relationship, Drug, Enzyme Activation, Enzyme Inhibitors, Enzyme-Linked Immunosorbent Assay, Flavonoids, Humans, Immunoblotting, Immunoprecipitation, Insulin Receptor Substrate Proteins, MAP Kinase Signaling System, Mice, Mitogen-Activated Protein Kinase 1, Mitogen-Activated Protein Kinase 3, Mitogens, NIH 3T3 Cells, Neuroblastoma, Neurons, Phosphoproteins, Phosphorylation, Plasmids, Protein-Tyrosine Kinases, Proto-Oncogene Proteins, Proto-Oncogene Proteins c-cbl, Receptor Protein-Tyrosine Kinases, Shc Signaling Adaptor Proteins, Thymidine, Time Factors, Tyrosine, Ubiquitin-Protein Ligases
Adaptor Proteins, Signal Transducing, Animals, Antibodies, Monoclonal, Cell Line, Cell Line, Tumor, Cell Proliferation, DNA, Dose-Response Relationship, Drug, Enzyme Activation, Enzyme Inhibitors, Enzyme-Linked Immunosorbent Assay, Flavonoids, Humans, Immunoblotting, Immunoprecipitation, Insulin Receptor Substrate Proteins, MAP Kinase Signaling System, Mice, Mitogen-Activated Protein Kinase 1, Mitogen-Activated Protein Kinase 3, Mitogens, NIH 3T3 Cells, Neuroblastoma, Neurons, Phosphoproteins, Phosphorylation, Plasmids, Protein-Tyrosine Kinases, Proto-Oncogene Proteins, Proto-Oncogene Proteins c-cbl, Receptor Protein-Tyrosine Kinases, Shc Signaling Adaptor Proteins, Thymidine, Time Factors, Tyrosine, Ubiquitin-Protein Ligases
J. Cell. Sci.
Date: Jul. 01, 2004
PubMed ID: 15226403
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