The objective of this proposal is to examine the role of src in the control of integrin mediated cell adhesion to fibronectin. Fibronectin is the dominant ligand for adhesion of fibroblasts and other mesenchymal cell types, and adhesion to fibronectin plays a central role in the control of the proliferation and differentiation of these cells. The experiments focus on the isolation of the different molecular mechanisms which contribute to cell adhesion strength both at early and later times in the adhesion process. The experiments are based on a novel spanning this device to measure adhesion strength and an analytic system based on a K562 cell model and a collection of monoclonal antibodies which provide the basis for the measurement of the specific receptor-ligand binding strength for different fibronectin receptors and for different activation states of those receptors. In the first two specific aims v- src (or activated c-src) transformed cells and cells from src-/- and FAK-/- cell lines will be examined in combination with specific src and FAK mutants to examine the possible role(s) for these genes in the control of integrin activation states. The third and fourth specific aims focus on the connections between integrin and cytoskeleton which may be regulated by the action of src. The level of phosphorylation of b1 integrin is raised in v-src transformed cells; the possibility that this is also true for b3 will be tested. The role of phosphorylation of b1 and b3 integrin will be examined using specific mutants to determine how and if this phosphorylation regulates the functional interaction of integrin and cytoskeleton. The spinning disc analysis will be adapted to analysis of longer term adhesion and the development of a general method to examine the interplay between the strength of integrin-ligand and integrin-cytoskeletal linkages is proposed. This will be applied to analysis of the role of src in regulation of cytoskeletal structure and the linkage of cytoskeleton to integrin.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
5R01CA016502-28
Application #
6628057
Study Section
Special Emphasis Panel (ZRG1-EVR (06))
Program Officer
Cole, John S
Project Start
1983-02-01
Project End
2005-01-31
Budget Start
2003-02-01
Budget End
2005-01-31
Support Year
28
Fiscal Year
2003
Total Cost
$312,310
Indirect Cost
Name
University of Pennsylvania
Department
Microbiology/Immun/Virology
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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