Growth hormone promoted tyrosyl phosphorylation of growth hormone receptors in murine 3T3-F442A fibroblasts and adipocytes

Carol M. Foster, Jules A. Shafer, Frank W. Rozsa, Xueyan Wang, Sidney D. Lewis, David A. Renken, Joanne E. Natale, Jessica Schwartz, JoAnne E Natale

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Abstract

Because many growth factor receptors are ligand-activated tyrosine protein kinases, the possibility that growth hormone (GH), a hormone implicated in human growth, promotes tyrosyl phosphorylation of its receptor was investigated. 125I-Labeled human GH was covalently cross-linked to receptors in intact 3T3-F442A fibroblasts, a cell line which differentiates into adipocytes in response to GH. The cross-linked cells were solubilized and passed over a column of phosphotyrosyl binding antibody immobilized on protein A-Sepharose. Immunoadsorbed proteins were eluted with a hapten (p-nitrophenyl phosphate) and analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and autoradiography. The eluate from the antibody column contained an Mr 134 000 125I-GH-receptor complex. A similar result was obtained when the adipocyte form of 3T3-F442A cells was used in place of the fibroblast form. O-Phosphotyrosine prevented 125I-GH-receptor complexes from binding to the antibody column, whereas O-phosphoserine and O-phosphothreonine did not. In studies of GH-promoted phosphorylation in 3T3-F442A fibroblasts labeled metabolically with [32P]Pi, GH was shown to stimulate formation of a 32P-labeled protein which bound to immobilized phosphotyrosyl binding antibodies. The molecular weight of 114 000 obtained for this protein is similar to that expected for non-cross-linked GH receptor. The Mr 114 000 phosphorylated protein could be immunoprecipitated with anti-GH antibody, indicating that GH remained noncovalently bound to this protein during absorption to and elution from the immobilized phosphotyrosyl binding antibody. Phosphoamino acid analysis after both limited acid hydrolysis and extensive base hydrolysis of the Mr 114 000 phosphoprotein confirmed the presence of phosphotyrosyl residues. These observations provide strong evidence that binding of GH to its receptor stimulates phosphorylation of tyrosyl residues in the GH receptor.

Original languageEnglish (US)
Pages (from-to)326-334
Number of pages9
JournalBiochemistry
Volume27
Issue number1
StatePublished - 1988
Externally publishedYes

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Somatotropin Receptors
Phosphorylation
Fibroblasts
Adipocytes
Growth Hormone
Antibodies
Proteins
Hydrolysis
Phosphothreonine
Phosphoamino Acids
Immobilized Proteins
Immobilized Antibodies
Phosphoserine
3T3 Cells
Phosphotyrosine
Growth Factor Receptors
Human Growth Hormone
Haptens
Phosphoproteins
Electrophoresis

ASJC Scopus subject areas

  • Biochemistry

Cite this

Foster, C. M., Shafer, J. A., Rozsa, F. W., Wang, X., Lewis, S. D., Renken, D. A., ... Natale, J. E. (1988). Growth hormone promoted tyrosyl phosphorylation of growth hormone receptors in murine 3T3-F442A fibroblasts and adipocytes. Biochemistry, 27(1), 326-334.

Growth hormone promoted tyrosyl phosphorylation of growth hormone receptors in murine 3T3-F442A fibroblasts and adipocytes. / Foster, Carol M.; Shafer, Jules A.; Rozsa, Frank W.; Wang, Xueyan; Lewis, Sidney D.; Renken, David A.; Natale, Joanne E.; Schwartz, Jessica; Natale, JoAnne E.

In: Biochemistry, Vol. 27, No. 1, 1988, p. 326-334.

Research output: Contribution to journalArticle

Foster, CM, Shafer, JA, Rozsa, FW, Wang, X, Lewis, SD, Renken, DA, Natale, JE, Schwartz, J & Natale, JE 1988, 'Growth hormone promoted tyrosyl phosphorylation of growth hormone receptors in murine 3T3-F442A fibroblasts and adipocytes', Biochemistry, vol. 27, no. 1, pp. 326-334.
Foster CM, Shafer JA, Rozsa FW, Wang X, Lewis SD, Renken DA et al. Growth hormone promoted tyrosyl phosphorylation of growth hormone receptors in murine 3T3-F442A fibroblasts and adipocytes. Biochemistry. 1988;27(1):326-334.
Foster, Carol M. ; Shafer, Jules A. ; Rozsa, Frank W. ; Wang, Xueyan ; Lewis, Sidney D. ; Renken, David A. ; Natale, Joanne E. ; Schwartz, Jessica ; Natale, JoAnne E. / Growth hormone promoted tyrosyl phosphorylation of growth hormone receptors in murine 3T3-F442A fibroblasts and adipocytes. In: Biochemistry. 1988 ; Vol. 27, No. 1. pp. 326-334.
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abstract = "Because many growth factor receptors are ligand-activated tyrosine protein kinases, the possibility that growth hormone (GH), a hormone implicated in human growth, promotes tyrosyl phosphorylation of its receptor was investigated. 125I-Labeled human GH was covalently cross-linked to receptors in intact 3T3-F442A fibroblasts, a cell line which differentiates into adipocytes in response to GH. The cross-linked cells were solubilized and passed over a column of phosphotyrosyl binding antibody immobilized on protein A-Sepharose. Immunoadsorbed proteins were eluted with a hapten (p-nitrophenyl phosphate) and analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and autoradiography. The eluate from the antibody column contained an Mr 134 000 125I-GH-receptor complex. A similar result was obtained when the adipocyte form of 3T3-F442A cells was used in place of the fibroblast form. O-Phosphotyrosine prevented 125I-GH-receptor complexes from binding to the antibody column, whereas O-phosphoserine and O-phosphothreonine did not. In studies of GH-promoted phosphorylation in 3T3-F442A fibroblasts labeled metabolically with [32P]Pi, GH was shown to stimulate formation of a 32P-labeled protein which bound to immobilized phosphotyrosyl binding antibodies. The molecular weight of 114 000 obtained for this protein is similar to that expected for non-cross-linked GH receptor. The Mr 114 000 phosphorylated protein could be immunoprecipitated with anti-GH antibody, indicating that GH remained noncovalently bound to this protein during absorption to and elution from the immobilized phosphotyrosyl binding antibody. Phosphoamino acid analysis after both limited acid hydrolysis and extensive base hydrolysis of the Mr 114 000 phosphoprotein confirmed the presence of phosphotyrosyl residues. These observations provide strong evidence that binding of GH to its receptor stimulates phosphorylation of tyrosyl residues in the GH receptor.",
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