Heparin-binding growth factor 1 stimulates tyrosine phosphorylation in NIH 3T3 cells.
Journal: 1989/August - Molecular and Cellular Biology
ISSN: 0270-7306
PUBMED: 2473389
Abstract:
Tyrosine phosphorylation of cellular proteins induced by heparin-binding growth factor 1 (HBGF-1) was studied by using the murine fibroblast cell line NIH 3T3 (clone 2.2). HBGF-1 specifically induced the rapid tyrosine phosphorylation of polypeptides of Mr 150,000, 130,000, and 90,000 that were detected with polyclonal and monoclonal antiphosphotyrosine (anti-P-Tyr) antibodies. The concentration of HBGF-1 required for half-maximal induction of tyrosine phosphorylation of the Mr-150,000 Mr-130,000, and Mr-90,000 proteins was approximately 0.2 to 0.5 ng/ml, which was consistent with the half-maximal concentration required for stimulation of DNA synthesis in NIH 3T3 cells. HBGF-1-induced tyrosine phosphorylation of the Mr-150,000 and Mr-130,000 proteins was detected within 30 s, whereas phosphorylation of the Mr-90,000 protein was not detected until 3 min after HBGF-1 stimulation. All three proteins were phosphorylated maximally after 15 to 30 min. Phosphoamino acid analysis of the Mr-150,000 and Mr-90,000 proteins confirmed the phosphorylation of these proteins on tyrosine residues. Phosphorylation of the Mr-150,000 and Mr-90,000 proteins occurred when cells were exposed to HBGF-1 at 37 degrees C but not at 4 degrees C. Exposure of cells to sodium orthovanadate, a potent P-Tyr phosphatase inhibitor, before stimulation with HBGF-1 resulted in enhanced detection of the Mr-150,000, Mr-130,000, and Mr-90,000 proteins by anti-P-Tyr antibodies. Anti-P-Tyr affinity-based chromatography was used to adsorb the HBGF-1 receptor affinity labeled with 125I-HBGF-1. The cross-linked HBGF-1 receptor-ligand complex was eluded with phenyl phosphate as two components: Mr 170,000 and 150,000. P-Tyr, but not phosphoserine or phosphothreonine, inhibited adsorption of the (125)I-HBGF-1-receptor complex to the anti-P-Tyr antibody matrix. Treatment of cells with sodium orthovanadate also enhanced recognition of the cross-linked (125)I-HBGF-1-receptor complex by the anti-P-Tyr matrix. These data suggest that (i) the (125)I-HBGF-1-receptor complex is phosphorylated on tyrosine residues and (ii) HBGF-1-induced signal transduction involves, in part, the tyrosine phosphorylation of at least three polypeptides.
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Mol Cell Biol 9(5): 1857-1865

Heparin-binding growth factor 1 stimulates tyrosine phosphorylation in NIH 3T3 cells.

Abstract

Tyrosine phosphorylation of cellular proteins induced by heparin-binding growth factor 1 (HBGF-1) was studied by using the murine fibroblast cell line NIH 3T3 (clone 2.2). HBGF-1 specifically induced the rapid tyrosine phosphorylation of polypeptides of Mr 150,000, 130,000, and 90,000 that were detected with polyclonal and monoclonal antiphosphotyrosine (anti-P-Tyr) antibodies. The concentration of HBGF-1 required for half-maximal induction of tyrosine phosphorylation of the Mr-150,000 Mr-130,000, and Mr-90,000 proteins was approximately 0.2 to 0.5 ng/ml, which was consistent with the half-maximal concentration required for stimulation of DNA synthesis in NIH 3T3 cells. HBGF-1-induced tyrosine phosphorylation of the Mr-150,000 and Mr-130,000 proteins was detected within 30 s, whereas phosphorylation of the Mr-90,000 protein was not detected until 3 min after HBGF-1 stimulation. All three proteins were phosphorylated maximally after 15 to 30 min. Phosphoamino acid analysis of the Mr-150,000 and Mr-90,000 proteins confirmed the phosphorylation of these proteins on tyrosine residues. Phosphorylation of the Mr-150,000 and Mr-90,000 proteins occurred when cells were exposed to HBGF-1 at 37 degrees C but not at 4 degrees C. Exposure of cells to sodium orthovanadate, a potent P-Tyr phosphatase inhibitor, before stimulation with HBGF-1 resulted in enhanced detection of the Mr-150,000, Mr-130,000, and Mr-90,000 proteins by anti-P-Tyr antibodies. Anti-P-Tyr affinity-based chromatography was used to adsorb the HBGF-1 receptor affinity labeled with 125I-HBGF-1. The cross-linked HBGF-1 receptor-ligand complex was eluded with phenyl phosphate as two components: Mr 170,000 and 150,000. P-Tyr, but not phosphoserine or phosphothreonine, inhibited adsorption of the (125)I-HBGF-1-receptor complex to the anti-P-Tyr antibody matrix. Treatment of cells with sodium orthovanadate also enhanced recognition of the cross-linked (125)I-HBGF-1-receptor complex by the anti-P-Tyr matrix. These data suggest that (i) the (125)I-HBGF-1-receptor complex is phosphorylated on tyrosine residues and (ii) HBGF-1-induced signal transduction involves, in part, the tyrosine phosphorylation of at least three polypeptides.

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Jerome H. Holland Laboratory for the Biomedical Sciences, American Red Cross, Rockeville, Maryland 20855.
Jerome H. Holland Laboratory for the Biomedical Sciences, American Red Cross, Rockeville, Maryland 20855.
Abstract
Tyrosine phosphorylation of cellular proteins induced by heparin-binding growth factor 1 (HBGF-1) was studied by using the murine fibroblast cell line NIH 3T3 (clone 2.2). HBGF-1 specifically induced the rapid tyrosine phosphorylation of polypeptides of Mr 150,000, 130,000, and 90,000 that were detected with polyclonal and monoclonal antiphosphotyrosine (anti-P-Tyr) antibodies. The concentration of HBGF-1 required for half-maximal induction of tyrosine phosphorylation of the Mr-150,000 Mr-130,000, and Mr-90,000 proteins was approximately 0.2 to 0.5 ng/ml, which was consistent with the half-maximal concentration required for stimulation of DNA synthesis in NIH 3T3 cells. HBGF-1-induced tyrosine phosphorylation of the Mr-150,000 and Mr-130,000 proteins was detected within 30 s, whereas phosphorylation of the Mr-90,000 protein was not detected until 3 min after HBGF-1 stimulation. All three proteins were phosphorylated maximally after 15 to 30 min. Phosphoamino acid analysis of the Mr-150,000 and Mr-90,000 proteins confirmed the phosphorylation of these proteins on tyrosine residues. Phosphorylation of the Mr-150,000 and Mr-90,000 proteins occurred when cells were exposed to HBGF-1 at 37 degrees C but not at 4 degrees C. Exposure of cells to sodium orthovanadate, a potent P-Tyr phosphatase inhibitor, before stimulation with HBGF-1 resulted in enhanced detection of the Mr-150,000, Mr-130,000, and Mr-90,000 proteins by anti-P-Tyr antibodies. Anti-P-Tyr affinity-based chromatography was used to adsorb the HBGF-1 receptor affinity labeled with 125I-HBGF-1. The cross-linked HBGF-1 receptor-ligand complex was eluded with phenyl phosphate as two components: Mr 170,000 and 150,000. P-Tyr, but not phosphoserine or phosphothreonine, inhibited adsorption of the (125)I-HBGF-1-receptor complex to the anti-P-Tyr antibody matrix. Treatment of cells with sodium orthovanadate also enhanced recognition of the cross-linked (125)I-HBGF-1-receptor complex by the anti-P-Tyr matrix. These data suggest that (i) the (125)I-HBGF-1-receptor complex is phosphorylated on tyrosine residues and (ii) HBGF-1-induced signal transduction involves, in part, the tyrosine phosphorylation of at least three polypeptides.
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