Mechanism of down-regulation of c-kit receptor. Roles of receptor tyrosine kinase, phosphatidylinositol 3'-kinase, and protein kinase C

N. S. Yee, C. W.M. Hsiau, H. Serve, K. Vosseller, P. Besmer

Research output: Contribution to journalArticle

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Abstract

The receptor tyrosine kinase Kit and Kit ligand (KL), encoded at the murine white spotting (W) and steel (Sl) loci, respectively, function in hematopoiesis, melanogenesis, and gametogenesis. To understand the mechanism of turnover of Kit in mast cells, mutant receptors generated in vitro were heterologously expressed in W(sh)/W(sh) mast cells lacking endogenous c-kit expression, and the effects of mutations on KL-induced internalization and ubiquitination/degradation of Kit were studied. Upon binding of KL, KL·Kit receptor complexes were rapidly internalized, and the turnover was accelerated by ubiquitin-mediated degradation. Inactivation of the Kit kinase resulted in a reduced rate of internalization of KL·Kit complexes, degradation of kinase-inactive receptor complexes was relatively slow, and receptor ubiquitination was absent. But abolishment of KL-induced receptor association and activation of phosphatidylinositol 3'-kinase and of tyrosine 821 autophosphorylation did not affect KL-induced internalization and ubiquitination/degradation of Kit. Furthermore, Kit receptors can be down- regulated by proteolytic cleavage induced by either activation of protein kinase C or by isopropyl alcohol. In summary, KL-induced internalization of KL·Kit complexes and ubiquitination/degradation require an active kinase. By contrast, proteolytic cleavage of Kit mediated by protein kinase C activation is independent of kinase activity.

Original languageEnglish (US)
Pages (from-to)31991-31998
Number of pages8
JournalJournal of Biological Chemistry
Volume269
Issue number50
StatePublished - Jan 1 1994

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Phosphatidylinositol 3-Kinase
Proto-Oncogene Proteins c-kit
Stem Cell Factor
Receptor Protein-Tyrosine Kinases
Protein Kinase C
Down-Regulation
Ubiquitination
Degradation
Phosphotransferases
Chemical activation
Mast Cells
Gametogenesis
Metrorrhagia
2-Propanol
Steel
Hematopoiesis
Ubiquitin
Tyrosine
Association reactions
Mutation

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

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title = "Mechanism of down-regulation of c-kit receptor. Roles of receptor tyrosine kinase, phosphatidylinositol 3'-kinase, and protein kinase C",
abstract = "The receptor tyrosine kinase Kit and Kit ligand (KL), encoded at the murine white spotting (W) and steel (Sl) loci, respectively, function in hematopoiesis, melanogenesis, and gametogenesis. To understand the mechanism of turnover of Kit in mast cells, mutant receptors generated in vitro were heterologously expressed in W(sh)/W(sh) mast cells lacking endogenous c-kit expression, and the effects of mutations on KL-induced internalization and ubiquitination/degradation of Kit were studied. Upon binding of KL, KL·Kit receptor complexes were rapidly internalized, and the turnover was accelerated by ubiquitin-mediated degradation. Inactivation of the Kit kinase resulted in a reduced rate of internalization of KL·Kit complexes, degradation of kinase-inactive receptor complexes was relatively slow, and receptor ubiquitination was absent. But abolishment of KL-induced receptor association and activation of phosphatidylinositol 3'-kinase and of tyrosine 821 autophosphorylation did not affect KL-induced internalization and ubiquitination/degradation of Kit. Furthermore, Kit receptors can be down- regulated by proteolytic cleavage induced by either activation of protein kinase C or by isopropyl alcohol. In summary, KL-induced internalization of KL·Kit complexes and ubiquitination/degradation require an active kinase. By contrast, proteolytic cleavage of Kit mediated by protein kinase C activation is independent of kinase activity.",
author = "Yee, {N. S.} and Hsiau, {C. W.M.} and H. Serve and K. Vosseller and P. Besmer",
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Mechanism of down-regulation of c-kit receptor. Roles of receptor tyrosine kinase, phosphatidylinositol 3'-kinase, and protein kinase C. / Yee, N. S.; Hsiau, C. W.M.; Serve, H.; Vosseller, K.; Besmer, P.

In: Journal of Biological Chemistry, Vol. 269, No. 50, 01.01.1994, p. 31991-31998.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Mechanism of down-regulation of c-kit receptor. Roles of receptor tyrosine kinase, phosphatidylinositol 3'-kinase, and protein kinase C

AU - Yee, N. S.

AU - Hsiau, C. W.M.

AU - Serve, H.

AU - Vosseller, K.

AU - Besmer, P.

PY - 1994/1/1

Y1 - 1994/1/1

N2 - The receptor tyrosine kinase Kit and Kit ligand (KL), encoded at the murine white spotting (W) and steel (Sl) loci, respectively, function in hematopoiesis, melanogenesis, and gametogenesis. To understand the mechanism of turnover of Kit in mast cells, mutant receptors generated in vitro were heterologously expressed in W(sh)/W(sh) mast cells lacking endogenous c-kit expression, and the effects of mutations on KL-induced internalization and ubiquitination/degradation of Kit were studied. Upon binding of KL, KL·Kit receptor complexes were rapidly internalized, and the turnover was accelerated by ubiquitin-mediated degradation. Inactivation of the Kit kinase resulted in a reduced rate of internalization of KL·Kit complexes, degradation of kinase-inactive receptor complexes was relatively slow, and receptor ubiquitination was absent. But abolishment of KL-induced receptor association and activation of phosphatidylinositol 3'-kinase and of tyrosine 821 autophosphorylation did not affect KL-induced internalization and ubiquitination/degradation of Kit. Furthermore, Kit receptors can be down- regulated by proteolytic cleavage induced by either activation of protein kinase C or by isopropyl alcohol. In summary, KL-induced internalization of KL·Kit complexes and ubiquitination/degradation require an active kinase. By contrast, proteolytic cleavage of Kit mediated by protein kinase C activation is independent of kinase activity.

AB - The receptor tyrosine kinase Kit and Kit ligand (KL), encoded at the murine white spotting (W) and steel (Sl) loci, respectively, function in hematopoiesis, melanogenesis, and gametogenesis. To understand the mechanism of turnover of Kit in mast cells, mutant receptors generated in vitro were heterologously expressed in W(sh)/W(sh) mast cells lacking endogenous c-kit expression, and the effects of mutations on KL-induced internalization and ubiquitination/degradation of Kit were studied. Upon binding of KL, KL·Kit receptor complexes were rapidly internalized, and the turnover was accelerated by ubiquitin-mediated degradation. Inactivation of the Kit kinase resulted in a reduced rate of internalization of KL·Kit complexes, degradation of kinase-inactive receptor complexes was relatively slow, and receptor ubiquitination was absent. But abolishment of KL-induced receptor association and activation of phosphatidylinositol 3'-kinase and of tyrosine 821 autophosphorylation did not affect KL-induced internalization and ubiquitination/degradation of Kit. Furthermore, Kit receptors can be down- regulated by proteolytic cleavage induced by either activation of protein kinase C or by isopropyl alcohol. In summary, KL-induced internalization of KL·Kit complexes and ubiquitination/degradation require an active kinase. By contrast, proteolytic cleavage of Kit mediated by protein kinase C activation is independent of kinase activity.

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