Cellular adhesiveness is a fundamental feature of cell behavior. The long-term goal of my research is to determine the mechanisms underlying cell adhesion to extracellular substrata. During the next five years we intent to investigate several general features of adhesion that are poorly understood and to study relationships between fibronectin receptors and other cell surface binding sites involved in adhesion. Specific problems on which we will focus are as follows: (1) We have found that Mn-dependent attachment and spreading of baby hamster kidney (BHK) cells on culture dishes cannot be explained in terms of the generally accepted model of cell adhesion. We plan to determine the effects of Mn on bead binding and phagocytosis by BHK cells and to analyze the BHK cell components involved in Mn-dependent adhesion. (2) We plan to determine the specificity of removal of substratum-bound proteins from beneath focal adhesion sites during attachment and spreading of human fibroblasts and the possible importance of this substratum remodeling process in other aspects of cell behavior. (3) We recently have prepared monoclonal antibodies against the WGA sites of baby hamster kidney cells. Antibodies that appear to react with the 50kd and 140kd complex fibronectin receptors have been partially characterized and will be studied in greater detail. We plan to analyze the role of these receptors in cell adhesion to substrata other than fibronectin. (4) We have isolated a BHK cell variant defective in cell contact to Fn-coated culture dishes. We will determine whether the Fn receptors of these cells interact abnormally with the cytoskeleton and analyze other alterations in recruitment of cell components to sites of cell-substratum contact.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
2R01CA014609-15
Application #
3163969
Study Section
Cellular Biology and Physiology Subcommittee 1 (CBY)
Project Start
1979-06-01
Project End
1992-11-30
Budget Start
1987-12-01
Budget End
1988-11-30
Support Year
15
Fiscal Year
1988
Total Cost
Indirect Cost
Name
University of Texas Sw Medical Center Dallas
Department
Type
Overall Medical
DUNS #
City
Dallas
State
TX
Country
United States
Zip Code
75390
Altankov, G; Grinnell, F (1993) Depletion of intracellular potassium disrupts coated pits and reversibly inhibits cell polarization during fibroblast spreading. J Cell Biol 120:1449-59
Grinnell, F; Ho, C H; Wysocki, A (1992) Degradation of fibronectin and vitronectin in chronic wound fluid: analysis by cell blotting, immunoblotting, and cell adhesion assays. J Invest Dermatol 98:410-6
Grinnell, F (1992) Wound repair, keratinocyte activation and integrin modulation. J Cell Sci 101 ( Pt 1):1-5
Mochitate, K; Pawelek, P; Grinnell, F (1991) Stress relaxation of contracted collagen gels: disruption of actin filament bundles, release of cell surface fibronectin, and down-regulation of DNA and protein synthesis. Exp Cell Res 193:198-207
Guo, M; Kim, L T; Akiyama, S K et al. (1991) Altered processing of integrin receptors during keratinocyte activation. Exp Cell Res 195:315-22
Grinnell, F; Backman, R (1991) Role of integrin receptors in manganese-dependent BHK cell spreading on albumin-coated substrata. Exp Cell Res 195:218-23
Guo, M; Toda, K; Grinnell, F (1990) Activation of human keratinocyte migration on type I collagen and fibronectin. J Cell Sci 96 ( Pt 2):197-205
Grinnell, F (1990) The activated keratinocyte: up regulation of cell adhesion and migration during wound healing. J Trauma 30:S144-9
Tuan, T L; Grinnell, F (1989) Fibronectin and fibrinolysis are not required for fibrin gel contraction by human skin fibroblasts. J Cell Physiol 140:577-83
Grinnell, F; Ho, C H; Tuan, T L (1988) Cell adhesion and phagocytosis promoted by monoclonal antibodies not directed against fibronectin receptors. J Cell Sci 90 ( Pt 2):201-14

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