Growth hormone-induced signal transduction depends on an intact ubiquitin system

Ger J. Strous, Peter Van Kerkhof, Roland Covers, Peter Rotwein, Alan L. Schwartz

Research output: Contribution to journalArticle

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Abstract

The growth hormone receptor (GHR) is a ubiquitinated cell surface protein. Ligand binding and receptor dimerization activate the cytosolic kinase Jak2. This event initiates signal transduction via STAT proteins. Expression of GHR in a Chinese hamster ovary (CHO) cell line, which exhibits a temperature-sensitive defect in ubiquitin conjugation (CHO-ts20), as well as in wild type cells (CHO-E36) has shown that endocytosis of the receptor requires an intact ubiquitin conjugation system (Strous G. J., van Kerkhof, P., Govers, R., Ciechanover A., and Schwartz, A. L. (1996) EMBO J. 15, 3806- 3812). We have now examined the requirement for ubiquitin conjugation in growth factor-mediated signal transduction. In CHO-E36 and in CHO-ts20 cells at the permissive temperature, STAT proteins were activated in a growth factor-dependent fashion. However, no activation of STAT proteins was observed at the nonpermissive temperature in CHO-ts20 cells. Neither tyrosine phosphorylation of GHR nor of Jak2 was inhibited at the nonpermissive temperature. When tyrosine phosphorylation was inhibited following treatment with staurosporin, ubiquitination of the receptor proceeded normally. Furthermore, mutation of GHR phenylalanine-327, which prevents GHR endocytosis, inhibited receptor ubiquitination but allowed normal Jak/STAT- mediated signal transduction. Thus, these data provide evidence that the ubiquitin conjugation system is involved in the Jak/STAT signaling pathway, be it not at the initial stage(s) of Jak2 activity.

Original languageEnglish (US)
Pages (from-to)40-43
Number of pages4
JournalJournal of Biological Chemistry
Volume272
Issue number1
DOIs
StatePublished - 1997
Externally publishedYes

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Somatotropin Receptors
Signal transduction
Ubiquitin
Cricetulus
Growth Hormone
Ovary
Signal Transduction
Phosphorylation
Temperature
Ubiquitination
Tyrosine
Endocytosis
Intercellular Signaling Peptides and Proteins
Proteins
Dimerization
Phenylalanine
Membrane Proteins
Phosphotransferases
Chemical activation
Cells

ASJC Scopus subject areas

  • Biochemistry

Cite this

Strous, G. J., Van Kerkhof, P., Covers, R., Rotwein, P., & Schwartz, A. L. (1997). Growth hormone-induced signal transduction depends on an intact ubiquitin system. Journal of Biological Chemistry, 272(1), 40-43. https://doi.org/10.1074/jbc.272.1.40

Growth hormone-induced signal transduction depends on an intact ubiquitin system. / Strous, Ger J.; Van Kerkhof, Peter; Covers, Roland; Rotwein, Peter; Schwartz, Alan L.

In: Journal of Biological Chemistry, Vol. 272, No. 1, 1997, p. 40-43.

Research output: Contribution to journalArticle

Strous, GJ, Van Kerkhof, P, Covers, R, Rotwein, P & Schwartz, AL 1997, 'Growth hormone-induced signal transduction depends on an intact ubiquitin system', Journal of Biological Chemistry, vol. 272, no. 1, pp. 40-43. https://doi.org/10.1074/jbc.272.1.40
Strous, Ger J. ; Van Kerkhof, Peter ; Covers, Roland ; Rotwein, Peter ; Schwartz, Alan L. / Growth hormone-induced signal transduction depends on an intact ubiquitin system. In: Journal of Biological Chemistry. 1997 ; Vol. 272, No. 1. pp. 40-43.
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