Epidermal growth factor (EGF) and hormones stimulate phosphoinositide hydrolysis and increase EGF receptor protein synthesis and mRNA levels in rat liver epithelial cells. Evidence for protein kinase C-dependent and -independent pathways

H. S. Earp, J. R. Hepler, Leslie Anne Petch Lee, A. Miller, A. R. Berry, J. A. Harris, V. W. Raymond, B. K. McCune, L. W. Lee, J. W. Grisham, T. K. Harden

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Abstract

Epidermal growth factor (EGF) stimulated the rapid accumulation of inositol trisphosphate in WB cells, a continuous line of rat hepatic epithelial cells. Since we previously had shown that EGF stimulates EGF receptor synthesis in these cells, we tested whether hormones that stimulate PtdIns(4,5)P2 hydrolysis would increase EGF receptor protein synthesis and mRNA levels. Epinephrine, angiotensin II, and [Arg8] vasopressin activate phospholipase C in WB cells as evidenced by the accumulation of the inositol phosphates, inositol monophosphate, inositol biphosphate, and inositol triphosphate. A 3-4-h treatment with each hormone also increased the rate of EGF receptor protein synthesis by 3-6-fold as assessed by immunoprecipitation of EGF receptor from [35S]methionine-labeled cells. Northern blot analyses of WB cell EGF receptor mRNA levels revaled that agents linked to the phosphoinositide signaling system increased receptor mRNA content within 1-2 h. A maximal increase of 3-7-fold was observed after a 3-h exposure of EGF and hormones. The phorbol ester, 12-O-tetradecanoylphorbol 13-acetate (TPA), which activates protein kinase C also stimulated EGF receptor synthesis. Pretreatment of WB cells for 18 h with high concentrations of TPA 'down-regulated' protein kinase C and blocked TPA-directed EGF receptor mRNA synthesis. In contrast, the effect of EGF on EGF receptor mRNA levels was not significantly decreased by TPA pretreatment. Epinephrine-induced increases in EGF receptor mRNA were reduced from 4- to 2-fold. Similarly, 18 h TPA pretreatment abolished the effect of TPA on EGF receptor protein synthesis but did not affect EGF-dependent receptor protein synthesis. The 18-h TPA pretreatment diminished by 30-50% the induction of receptor protein synthesis by epinephrine or angiotensin II. We conclude that in WB cells EGF receptor synthesis can be regulated by EGF and other hormones that stimulate PtdIns(4,5)P2 hydrolysis. In these cells, EGF receptor synthesis appears to be regulated by several mechanisms: one pathway is dependent upon EGF receptor activation and can operate independently of protein kinase C activation: another pathway is correlated with PtdIns(4,5)P2 hydrolysis and is dependent, at least in part, upon protein kinase C activation.

Original languageEnglish (US)
Pages (from-to)13868-13874
Number of pages7
JournalJournal of Biological Chemistry
Volume263
Issue number27
StatePublished - Jan 1 1988
Externally publishedYes

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Phosphatidylinositols
Epidermal Growth Factor Receptor
Epidermal Growth Factor
Liver
Protein Kinase C
Rats
Hydrolysis
Epithelial Cells
Hormones
Messenger RNA
Tetradecanoylphorbol Acetate
Acetates
Proteins
Phosphatidylinositol 4,5-Diphosphate
Inositol
Epinephrine
Chemical activation
Angiotensin II
Inositol Phosphates
Type C Phospholipases

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

Epidermal growth factor (EGF) and hormones stimulate phosphoinositide hydrolysis and increase EGF receptor protein synthesis and mRNA levels in rat liver epithelial cells. Evidence for protein kinase C-dependent and -independent pathways. / Earp, H. S.; Hepler, J. R.; Petch Lee, Leslie Anne; Miller, A.; Berry, A. R.; Harris, J. A.; Raymond, V. W.; McCune, B. K.; Lee, L. W.; Grisham, J. W.; Harden, T. K.

In: Journal of Biological Chemistry, Vol. 263, No. 27, 01.01.1988, p. 13868-13874.

Research output: Contribution to journalArticle

Earp, H. S. ; Hepler, J. R. ; Petch Lee, Leslie Anne ; Miller, A. ; Berry, A. R. ; Harris, J. A. ; Raymond, V. W. ; McCune, B. K. ; Lee, L. W. ; Grisham, J. W. ; Harden, T. K. / Epidermal growth factor (EGF) and hormones stimulate phosphoinositide hydrolysis and increase EGF receptor protein synthesis and mRNA levels in rat liver epithelial cells. Evidence for protein kinase C-dependent and -independent pathways. In: Journal of Biological Chemistry. 1988 ; Vol. 263, No. 27. pp. 13868-13874.
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abstract = "Epidermal growth factor (EGF) stimulated the rapid accumulation of inositol trisphosphate in WB cells, a continuous line of rat hepatic epithelial cells. Since we previously had shown that EGF stimulates EGF receptor synthesis in these cells, we tested whether hormones that stimulate PtdIns(4,5)P2 hydrolysis would increase EGF receptor protein synthesis and mRNA levels. Epinephrine, angiotensin II, and [Arg8] vasopressin activate phospholipase C in WB cells as evidenced by the accumulation of the inositol phosphates, inositol monophosphate, inositol biphosphate, and inositol triphosphate. A 3-4-h treatment with each hormone also increased the rate of EGF receptor protein synthesis by 3-6-fold as assessed by immunoprecipitation of EGF receptor from [35S]methionine-labeled cells. Northern blot analyses of WB cell EGF receptor mRNA levels revaled that agents linked to the phosphoinositide signaling system increased receptor mRNA content within 1-2 h. A maximal increase of 3-7-fold was observed after a 3-h exposure of EGF and hormones. The phorbol ester, 12-O-tetradecanoylphorbol 13-acetate (TPA), which activates protein kinase C also stimulated EGF receptor synthesis. Pretreatment of WB cells for 18 h with high concentrations of TPA 'down-regulated' protein kinase C and blocked TPA-directed EGF receptor mRNA synthesis. In contrast, the effect of EGF on EGF receptor mRNA levels was not significantly decreased by TPA pretreatment. Epinephrine-induced increases in EGF receptor mRNA were reduced from 4- to 2-fold. Similarly, 18 h TPA pretreatment abolished the effect of TPA on EGF receptor protein synthesis but did not affect EGF-dependent receptor protein synthesis. The 18-h TPA pretreatment diminished by 30-50{\%} the induction of receptor protein synthesis by epinephrine or angiotensin II. We conclude that in WB cells EGF receptor synthesis can be regulated by EGF and other hormones that stimulate PtdIns(4,5)P2 hydrolysis. In these cells, EGF receptor synthesis appears to be regulated by several mechanisms: one pathway is dependent upon EGF receptor activation and can operate independently of protein kinase C activation: another pathway is correlated with PtdIns(4,5)P2 hydrolysis and is dependent, at least in part, upon protein kinase C activation.",
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T1 - Epidermal growth factor (EGF) and hormones stimulate phosphoinositide hydrolysis and increase EGF receptor protein synthesis and mRNA levels in rat liver epithelial cells. Evidence for protein kinase C-dependent and -independent pathways

AU - Earp, H. S.

AU - Hepler, J. R.

AU - Petch Lee, Leslie Anne

AU - Miller, A.

AU - Berry, A. R.

AU - Harris, J. A.

AU - Raymond, V. W.

AU - McCune, B. K.

AU - Lee, L. W.

AU - Grisham, J. W.

AU - Harden, T. K.

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N2 - Epidermal growth factor (EGF) stimulated the rapid accumulation of inositol trisphosphate in WB cells, a continuous line of rat hepatic epithelial cells. Since we previously had shown that EGF stimulates EGF receptor synthesis in these cells, we tested whether hormones that stimulate PtdIns(4,5)P2 hydrolysis would increase EGF receptor protein synthesis and mRNA levels. Epinephrine, angiotensin II, and [Arg8] vasopressin activate phospholipase C in WB cells as evidenced by the accumulation of the inositol phosphates, inositol monophosphate, inositol biphosphate, and inositol triphosphate. A 3-4-h treatment with each hormone also increased the rate of EGF receptor protein synthesis by 3-6-fold as assessed by immunoprecipitation of EGF receptor from [35S]methionine-labeled cells. Northern blot analyses of WB cell EGF receptor mRNA levels revaled that agents linked to the phosphoinositide signaling system increased receptor mRNA content within 1-2 h. A maximal increase of 3-7-fold was observed after a 3-h exposure of EGF and hormones. The phorbol ester, 12-O-tetradecanoylphorbol 13-acetate (TPA), which activates protein kinase C also stimulated EGF receptor synthesis. Pretreatment of WB cells for 18 h with high concentrations of TPA 'down-regulated' protein kinase C and blocked TPA-directed EGF receptor mRNA synthesis. In contrast, the effect of EGF on EGF receptor mRNA levels was not significantly decreased by TPA pretreatment. Epinephrine-induced increases in EGF receptor mRNA were reduced from 4- to 2-fold. Similarly, 18 h TPA pretreatment abolished the effect of TPA on EGF receptor protein synthesis but did not affect EGF-dependent receptor protein synthesis. The 18-h TPA pretreatment diminished by 30-50% the induction of receptor protein synthesis by epinephrine or angiotensin II. We conclude that in WB cells EGF receptor synthesis can be regulated by EGF and other hormones that stimulate PtdIns(4,5)P2 hydrolysis. In these cells, EGF receptor synthesis appears to be regulated by several mechanisms: one pathway is dependent upon EGF receptor activation and can operate independently of protein kinase C activation: another pathway is correlated with PtdIns(4,5)P2 hydrolysis and is dependent, at least in part, upon protein kinase C activation.

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