Regulation of epidermal growth factor (EGF) receptor-mediated mitogenesis will be examined in normal and transformed cells and characterization of the platelet-derived growth factor (PDGF) receptor will be initiated. The functional significance of phosphorylation of the EGF receptor induced by EGF or tumor promoters will be investigated in vivo and in vitro in regard to the effects of phosphorylation on receptor protein kinase activity and perhaps on receptor inositol phosphatide kinase activity. The receptor is known to be associated with tyrosine-specific protein kinase activity and may also possess inositol phosphatide kinase activity as recently found for the src and ros gene products of Rous sarcoma virus and UR2 sarcoma virus, respectively. EGF receptor preparations will be assayed for in vitro inositol phosphatide kinase activity and the effects of EGF and TPA on inositol phosphatide metabolism will be determined in vivo. The involvement of EGF receptor phosphorylation during transit of the G?1? phase of the cell cycle will be established in studies of the effects of PDGF on EGF receptor phosphorylation using synchronous cultures of human fibroblasts grown in serum-free medium. The roles of inositol phosphatide metabolism and protein kinase C activity in coordinate processes involving the PDGF and EGF systems will also be studied. EGF receptor metabolism in transformed cells in which abnormal forms of the EGF receptor play a direct role in transformation-dependent loss of growth control (avian erythroblastosis virus-transformed cells and B104 neuroblastoma cells) or in which the function of altered EGF receptor metabolism is not clearly established (Rous sarcoma virus transformed cells) will be studied in terms of regulation of kinase activity through receptor phosphorylation, inositol phosphatide metabolism, and receptor biosynthesis and degradation. Monoclonal and polyclonal antibodies against the PDGF receptor will be prepared in order to initiate work concerning the numerous aspects of PDGF receptor function in normal and transformed cells. (J)

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
5R01CA037754-02
Application #
3175547
Study Section
Cellular Biology and Physiology Subcommittee 1 (CBY)
Project Start
1985-05-01
Project End
1987-04-30
Budget Start
1986-05-01
Budget End
1987-04-30
Support Year
2
Fiscal Year
1986
Total Cost
Indirect Cost
Name
Rockefeller University
Department
Type
Graduate Schools
DUNS #
071037113
City
New York
State
NY
Country
United States
Zip Code
10065
Zhu, G; Decker, S J; Mayer, B J et al. (1993) Direct analysis of the binding of the abl Src homology 2 domain to the activated epidermal growth factor receptor. J Biol Chem 268:1775-9
Decker, S J (1993) Transmembrane signaling by epidermal growth factor receptors lacking autophosphorylation sites. J Biol Chem 268:9176-9
Decker, S J; Alexander, C; Habib, T (1992) Epidermal growth factor (EGF)-stimulated tyrosine phosphorylation and EGF receptor degradation in cells expressing EGF receptors truncated at residue 973. J Biol Chem 267:1104-8
Ohmichi, M; Decker, S J; Pang, L et al. (1992) Inhibition of the cellular actions of nerve growth factor by staurosporine and K252A results from the attenuation of the activity of the trk tyrosine kinase. Biochemistry 31:4034-9
Zhu, G; Decker, S J; Saltiel, A R (1992) Direct analysis of the binding of Src-homology 2 domains of phospholipase C to the activated epidermal growth factor receptor. Proc Natl Acad Sci U S A 89:9559-63
Ohmichi, M; Pang, L; Decker, S J et al. (1992) Nerve growth factor stimulates the activities of the raf-1 and the mitogen-activated protein kinases via the trk protooncogene. J Biol Chem 267:14604-10
Ohmichi, M; Decker, S J; Saltiel, A R (1992) Nerve growth factor stimulates the tyrosine phosphorylation of a 38-kDa protein that specifically associates with the src homology domain of phospholipase C-gamma 1. J Biol Chem 267:21601-6
Ohmichi, M; Decker, S J; Saltiel, A R (1992) Activation of phosphatidylinositol-3 kinase by nerve growth factor involves indirect coupling of the trk proto-oncogene with src homology 2 domains. Neuron 9:769-77
Brott, B K; Decker, S; Shafer, J et al. (1991) GTPase-activating protein interactions with the viral and cellular Src kinases. Proc Natl Acad Sci U S A 88:755-9
Ohmichi, M; Decker, S J; Pang, L et al. (1991) Nerve growth factor binds to the 140 kd trk proto-oncogene product and stimulates its association with the src homology domain of phospholipase C gamma 1. Biochem Biophys Res Commun 179:217-23

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