Our goal is to understand the biological function of the vitamin K dependent protein, bone Gla protein, which we have discovered in mammalian bone. Toward this end, we plan experiments to explore the altered structure and physiological function of rabbit bone which has been made selectively deficient in Gla protein by the use of a unique Warfarin plus coagulation factor injection procedure we have developed. We also intend to investigate further the dramatic 1000-fold increase in weight percent of rat Gla protein which we have recently discovered occurs in the first two weeks after birth. Major problems to be investigated with the Gla protein deficient bone systems include the following: 1. Bone resorption in response to a calcium deficient diet and subsequent reformation of new bone when the diet is returned to normal. 2. Fracture repair, including histological and biomechanical tests of union. 3. Bone structure, including the nature and amount of bone mineral, biomechanical strength tests and histological structure. 4. Immunohistological localization of bone Gla protein, including identification of the cells which make the protein, its location in bone matrix, and the time it first appears in the formation of new bone. 5. Biosynthesis of the bone Gla protein in rat calvarial culture, including investigations into the possible formation of Gla protein by proteolytic processing of a precursor.

Agency
National Institute of Health (NIH)
Institute
National Institute of Arthritis, Diabetes, Digestive and Kidney Diseases (NIADDK)
Type
Research Project (R01)
Project #
5R01AM027029-06
Application #
3151700
Study Section
General Medicine B Study Section (GMB)
Project Start
1980-05-01
Project End
1986-04-30
Budget Start
1985-05-01
Budget End
1986-04-30
Support Year
6
Fiscal Year
1985
Total Cost
Indirect Cost
Name
University of California San Diego
Department
Type
Schools of Arts and Sciences
DUNS #
077758407
City
La Jolla
State
CA
Country
United States
Zip Code
92093
Hale, J E; Fraser, J D; Price, P A (1988) The identification of matrix Gla protein in cartilage. J Biol Chem 263:5820-4
Price, P A (1988) Role of vitamin-K-dependent proteins in bone metabolism. Annu Rev Nutr 8:565-83
Price, P A; Kaneda, Y (1987) Vitamin K counteracts the effect of warfarin in liver but not in bone. Thromb Res 46:121-31
Price, P A (1987) Warfarin and bone: implications for rational strategies to selectively antagonize the action of vitamin K in target tissues. Adv Exp Med Biol 214:55-66
Weiner, S (1986) Organization of extracellularly mineralized tissues: a comparative study of biological crystal growth. CRC Crit Rev Biochem 20:365-408
Furuta, Y; Jee, W S (1986) Effect of 16,16-dimethyl prostaglandin E2 methyl ester on weanling rat skeleton: daily and systemic administration. Anat Rec 215:305-16
Parks, N J; Jee, W S; Dell, R B et al. (1986) Assessment of cortical and trabecular bone distribution in the beagle skeleton by neutron activation analysis. Anat Rec 215:230-50
Weiner, S; Price, P A (1986) Disaggregation of bone into crystals. Calcif Tissue Int 39:365-75
Polig, E; Jee, W S (1985) Automated trabecular bone histomorphometry. Bone 6:357-9
Jee, W S; Ueno, K; Deng, Y P et al. (1985) The effects of prostaglandin E2 in growing rats: increased metaphyseal hard tissue and cortico-endosteal bone formation. Calcif Tissue Int 37:148-57

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