Our preliminary studies show that clonally derived AXC/SSh rat prostate cancer cells secrete growth promoting activity which has properties expected of polypeptides. Our data also indicate that growth factor production and the ability of cells to respond to elaborated mitogens may be cell line specific. We propose a series of studies to identify growth factors elaborated by AXC/SSh rat prostate cancer cells and to define action of individualized mitogens in rat prostate cancer cells. Studies are performed using AXC/SSh rat prostate cancer cell lines C3 and T5 which show the greatest apparent differences. The hypothesis that mitogen production by clonally derived rat prostate cancer cells is cell line specific will be tested. Heparin-Sepharose and gel permeation chromatography will be used to individualize elaborated mitogens and similarity to prototypic growth factors will be assessed by biologic assays. Individualized growth factors will be purified to homogeneity with precedence given to prostate mitogens having properties differing from those of prototypic growth factors. Purified mitogens will be characterized by performing biologic and physical assessments, including amino acid analyses. The hypothesis that elaborated mitogens act as autocrine or paracrine modulators of rat prostate cancer cell proliferation will be tested. Individualized prostate mitogens will be assessed for ability to affect proliferation of prostate cancer cells. Synergistic or antagonistic effects will be assessed using a mitogen assay based on 3H-thymidine incorporation. The hypothesis that inability of cells to respond to an elaborated mitogen is due to failure of receptor mediated processes will be tested by assessment for functional growth factor receptors. Content will be evaluated by saturation analysis protocols and apparent molecular weight will be defined by receptor-mitogen cross-linking and subsequent acrylamide gel size fractionation. Functional status of receptors will be assessed by defining mitogen mediated receptor phosphorylation.

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Research Project (R01)
Project #
7R01DK039766-03
Application #
3239719
Study Section
Diabetes and Digestive and Kidney Diseases Special Grants Review Committee (DDK)
Project Start
1987-09-30
Project End
1991-08-31
Budget Start
1989-09-01
Budget End
1990-08-31
Support Year
3
Fiscal Year
1989
Total Cost
Indirect Cost
Name
University of Texas Health Science Center San Antonio
Department
Type
Schools of Medicine
DUNS #
800772162
City
San Antonio
State
TX
Country
United States
Zip Code
78229
Hrzenjak, M; Shain, S A (1997) Fibroblast growth factor-2 and TPA enhance prostate-cancer-cell proliferation and activate members of the Ras and PKC signal transduction pathways. Recept Signal Transduct 7:207-19
McMillan, J I; Weeks, R; West, J W et al. (1996) Pharmacological inhibition of gelatinase B induction and tumor cell invasion. Int J Cancer 67:523-31
Shain, S A; Saric, T; Ke, L D et al. (1996) Endogenous fibroblast growth factor-1 or fibroblast growth factor-2 modulate prostate cancer cell proliferation. Cell Growth Differ 7:573-86
McMillan, J I; Riordan, J W; Couser, W G et al. (1996) Characterization of a glomerular epithelial cell metalloproteinase as matrix metalloproteinase-9 with enhanced expression in a model of membranous nephropathy. J Clin Invest 97:1094-101
Hrzenjak, M; Shain, S A (1995) Protein kinase C-dependent and -independent pathways of signal transduction in prostate cancer cells: fibroblast growth factor utilization of a protein kinase C-independent pathway. Cell Growth Differ 6:1129-42
Ke, L D; Rao-Tekmal, R; Shain, S A (1993) DNA sequencing artifacts: band smearing and loss. Biotechniques 15:840
Shain, S A; Ke, L D; Wong, G et al. (1992) Rat prostate cancer cell line-specific production and apparent secretion of heparin-binding growth factors. Cell Growth Differ 3:249-58
Shain, S A; Lin, A L; Wong, G (1992) Signal transduction defect appears to be the cause of rat prostate cancer cell fibroblast growth factor insensitivity. Cell Growth Differ 3:715-22
Shain, S A; Lin, A L; Koger, J D et al. (1990) Rat prostate cancer cells contain functional receptors for transforming growth factor-beta. Endocrinology 126:818-25
Shain, S A; Koger, J D (1989) Differences in responsiveness of clonally derived AXC/SSh rat prostate cancer cells to secreted or prototypic mitogens. Cancer Res 49:3898-903

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