A large body of experimental data suggests that activated cellular oncogenes, either acting alone or in combination, may be responsible for at least some human neoplasias. Two major classes of oncogene products are those having tyrosine kinase activity and those located in the nucleus. We have discovered that interactions between pp60c-src, the best studied example of a cellular tyrosine kinase, and the nuclear oncogenes adeno E1A, polyoma large T (plt) and myc can induce transformation NIH 3T3 cells and that gap junctional communication is downregulated by overexpression of pp60c-src and activated mutants. We will transfect sense and antisense plasmids which express the c-src, p27 gap junction protein, E1A, plt, v-myc genes and their mutants into rodent cells and compare the resultant effects on gap junction communication and other biological and biochemical properties to determine: 1) if gap junctional communication is reduced due to phosphorylation and if it is cause or an effect of src-induced transformation. 2) what c-src and E1A functions are involved in cotransformation and the reason the c-src/E1A cotransformed cells are not tumorigenic in vivo. (We will simultaneously extend our study of E1A-mediated induction of sensitivity to cytolysis by tumor necrosis factor.) 3) if the modifications to pp60c-src in plt/c-src and v-myc/c-src cotransformed cells are due to enhanced recombination or altered splicing induced by the nuclear oncogenes. We will map the locations of the modifications induced in pp60c-src and, if altered splicing is involved, determine the sequence of the modified forms by cDNA sequencing. These studies are part of our long term goal to trace the molecular pathways involved in carcinogenesis.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
5R01CA047333-05
Application #
3190903
Study Section
Chemical Pathology Study Section (CPA)
Project Start
1988-04-01
Project End
1993-03-31
Budget Start
1991-04-01
Budget End
1992-03-31
Support Year
5
Fiscal Year
1991
Total Cost
Indirect Cost
Name
Cornell University
Department
Type
Schools of Arts and Sciences
DUNS #
City
Ithaca
State
NY
Country
United States
Zip Code
14850
Chackalaparampil, I; Bagrodia, S; Shalloway, D (1994) Tyrosine dephosphorylation of pp60c-src is stimulated by a serine/threonine phosphatase inhibitor. Oncogene 9:1947-55
Hotz-Wagenblatt, A; Shalloway, D (1993) Gap junctional communication and neoplastic transformation. Crit Rev Oncog 4:541-58
David-Pfeuty, T; Bagrodia, S; Shalloway, D (1993) Differential localization patterns of myristoylated and nonmyristoylated c-Src proteins in interphase and mitotic c-Src overexpresser cells. J Cell Sci 105 ( Pt 3):613-28
Bagrodia, S; Taylor, S J; Shalloway, D (1993) Myristylation is required for Tyr-527 dephosphorylation and activation of pp60c-src in mitosis. Mol Cell Biol 13:1464-70
Shalloway, D; Bagrodia, S; Chackalaparampil, I et al. (1992) c-Src and mitosis. Ciba Found Symp 170:248-65;discussion 265-75
Shenoy, S; Chackalaparampil, I; Bagrodia, S et al. (1992) Role of p34cdc2-mediated phosphorylations in two-step activation of pp60c-src during mitosis. Proc Natl Acad Sci U S A 89:7237-41
Roussel, R R; Brodeur, S R; Shalloway, D et al. (1991) Selective binding of activated pp60c-src by an immobilized synthetic phosphopeptide modeled on the carboxyl terminus of pp60c-src. Proc Natl Acad Sci U S A 88:10696-700
Shalloway, D; Shenoy, S (1991) Oncoprotein kinases in mitosis. Adv Cancer Res 57:185-225
Mehta, P P; Hotz-Wagenblatt, A; Rose, B et al. (1991) Incorporation of the gene for a cell-cell channel protein into transformed cells leads to normalization of growth. J Membr Biol 124:207-25
Reddy, S; Mazzu, D; Mahan, D et al. (1990) Sequence and functional differences between Schmidt-Ruppin D and Schmidt-Ruppin A strains of pp60v-src. J Virol 64:3545-50

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