The long term objective is to provide a better understanding of the structure, biochemical properties and biologic functions of selected macromolecules which are important components of developing epiphyseal cartilage and growth plate cartilage. A major goal is to define the relation between the structure and functional properties of the link proteins. The normal structure and special properties of developing epiphyseal and growth plate cartilage depend upon the formation of extremely large, stable proteoglycan aggregates in extracellular matrix. Link proteins stabilize the binding of proteoglycan monomers to hyaluronate in these aggregates. One objective of the proposed studies is to conclusively demonstrate that the link proteins also increase aggregate size. Two forms of link proteins, with molecular weights of 46K and 51K, are present in proteoglycan aggregates. We have recently developed a method involving lectin affinity chromatography to isolate the individual link proteins on a preparative scale. Our recent studies suggest that the 51K link protein selectively increases aggregate size, while the 46K link protein seems to be required to effectively stabilize the binding of proteoglycan monomers to hyaluronate. A second objective is to establish the selective effects of the individual link proteins on aggregate size and stability by sedimentation velocity and electron microscopic studies of aggregates reassembled in the presence or absence of the 46K and 51K link proteins. A third objective is to elucidate the biochemical mechanism by which the link proteins increase aggregate size and stabilize aggregate. Studies will be carried out to examine the capacity of the individual link proteins to bind to hyaluronate, and to the hyaluronic acid binding region of proteoglycan monomer core protein. The structural features of the individual link proteins which mediate this binding, underlie their capacity to increase aggregate size, and stabilize the binding of proteoglycan monomers to hyaluronic acid will be examined.

Agency
National Institute of Health (NIH)
Institute
National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS)
Type
Method to Extend Research in Time (MERIT) Award (R37)
Project #
2R37AR021498-09
Application #
3481488
Study Section
Pathobiochemistry Study Section (PBC)
Project Start
1978-04-01
Project End
1991-03-31
Budget Start
1986-04-01
Budget End
1987-03-31
Support Year
9
Fiscal Year
1986
Total Cost
Indirect Cost
Name
Montefiore Medical Center (Bronx, NY)
Department
Type
DUNS #
City
New York
State
NY
Country
United States
Zip Code
10467
Guerassimov, A; Duffy, C; Zhang, Y et al. (1997) Immunity to cartilage link protein in patients with juvenile rheumatoid arthritis. J Rheumatol 24:959-64
Boskey, A L; Spevak, L; Doty, S B et al. (1997) Effects of bone CS-proteoglycans, DS-decorin, and DS-biglycan on hydroxyapatite formation in a gelatin gel. Calcif Tissue Int 61:298-305
Johnson, H J; Rosenberg, L; Choi, H U et al. (1997) Characterization of epiphycan, a small proteoglycan with a leucine-rich repeat core protein. J Biol Chem 272:18709-17
Leroux, J Y; Guerassimov, A; Cartman, A et al. (1996) Immunity to the G1 globular domain of the cartilage proteoglycan aggrecan can induce inflammatory erosive polyarthritis and spondylitis in BALB/c mice but immunity to G1 is inhibited by covalently bound keratan sulfate in vitro and in vivo. J Clin Invest 97:621-32
Liu, J; Laue, T M; Choi, H U et al. (1994) The self-association of biglycan from bovine articular cartilage. J Biol Chem 269:28366-73
Price, L K; Choi, H U; Rosenberg, L et al. (1992) The predominant form of secreted colony stimulating factor-1 is a proteoglycan. J Biol Chem 267:2190-9
Leroux, J Y; Poole, A R; Webber, C et al. (1992) Characterization of proteoglycan-reactive T cell lines and hybridomas from mice with proteoglycan-induced arthritis. J Immunol 148:2090-6
Bidanset, D J; Guidry, C; Rosenberg, L C et al. (1992) Binding of the proteoglycan decorin to collagen type VI. J Biol Chem 267:5250-6
Lewandowska, K; Choi, H U; Rosenberg, L C et al. (1991) Extracellular matrix adhesion-promoting activities of a dermatan sulfate proteoglycan-associated protein (22K) from bovine fetal skin. J Cell Sci 99 ( Pt 3):657-68
Rosenberg, L; Choi, H U; Tang, L H et al. (1991) Proteoglycans of bovine articular cartilage. The effects of divalent cations on the biochemical properties of link protein. J Biol Chem 266:7016-24

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