Cancer is a consequence of the development of neoplastic cells which display altered regulation of differentiation and usually altered proliferative responses which is a consequence of the altered differentiation. A number of oncogenes have been defined as genes whose expression is essential for both initiation and maintenance of the neoplastic phenotype. The studies proposed here are focused on the mechanism by which one of the oncogenes, v-src, induces alteration of the differentiated state of infected target cells. The secondary aspect of the proposal is whether the action of the v-src oncogene is analogous to the function of the proto- oncogene c-src. Three approaches are proposed: (a) The potential role of receptors for extracellular matrix as targets for regulation by the src associated kinase will be examined. The test system employs a monoclonal antibody which can both block the fibronectin receptor and interrupt myogenic differentiation in a manner analogous to v- src. These studies will be extended in myogenesis, chondrogenesis and lens cell differentiation systems. (b) Viral constructs with different viral and cellular oncogenes will be used in conjunction with these differentiation systems to examine whether they affect differentiation by the same mechanism as v-src. And (c), the expression of homologues the viral oncogenes will be examined at specific stages of early development in the chicken embryo to explore their function in development.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
5R01CA016502-15
Application #
3164425
Study Section
Experimental Virology Study Section (EVR)
Project Start
1983-02-01
Project End
1992-11-30
Budget Start
1988-12-01
Budget End
1989-11-30
Support Year
15
Fiscal Year
1989
Total Cost
Indirect Cost
Name
University of Pennsylvania
Department
Type
Schools of Medicine
DUNS #
042250712
City
Philadelphia
State
PA
Country
United States
Zip Code
19104
Boettiger, David (2007) Quantitative measurements of integrin-mediated adhesion to extracellular matrix. Methods Enzymol 426:1-25
Lee, Mark H; Ducheyne, Paul; Lynch, Laura et al. (2006) Effect of biomaterial surface properties on fibronectin-alpha5beta1 integrin interaction and cellular attachment. Biomaterials 27:1907-16
Lynch, Laura; Vodyanik, Pavel I; Boettiger, David et al. (2005) Insulin-like growth factor I controls adhesion strength mediated by alpha5beta1 integrins in motile carcinoma cells. Mol Biol Cell 16:51-63
Lee, Fang-Hua; Haskell, Christopher; Charo, Isreal F et al. (2004) Receptor-ligand binding in the cell-substrate contact zone: a quantitative analysis using CX3CR1 and CXCR1 chemokine receptors. Biochemistry 43:7179-86
Guvakova, Marina A; Boettiger, David; Adams, Josephine C (2002) Induction of fascin spikes in breast cancer cells by activation of the insulin-like growth factor-I receptor. Int J Biochem Cell Biol 34:685-98
Datta, Anirban; Huber, Francois; Boettiger, David (2002) Phosphorylation of beta3 integrin controls ligand binding strength. J Biol Chem 277:3943-9
Garcia, Andres J; Schwarzbauer, Jean E; Boettiger, David (2002) Distinct activation states of alpha5beta1 integrin show differential binding to RGD and synergy domains of fibronectin. Biochemistry 41:9063-9
Boettiger, D; Lynch, L; Blystone, S et al. (2001) Distinct ligand-binding modes for integrin alpha(v)beta(3)-mediated adhesion to fibronectin versus vitronectin. J Biol Chem 276:31684-90
Boettiger, D; Huber, F; Lynch, L et al. (2001) Activation of alpha(v)beta3-vitronectin binding is a multistage process in which increases in bond strength are dependent on Y747 and Y759 in the cytoplasmic domain of beta3. Mol Biol Cell 12:1227-37
Garcia, A J; Boettiger, D (1999) Integrin-fibronectin interactions at the cell-material interface: initial integrin binding and signaling. Biomaterials 20:2427-33

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