The long term objective of our research is to understand the regulatory mechanisms of cell proliferation and differentiation of mammary epithelial cells. Mammalian cells in culture can be classified as ethanolamine (Etn)-responsive and -nonresponsive type with regard to the growth response. The Etn-responsive type includes normal rat mammary epithelial cells and some human and rat mammary carcinoma cells. Etn-responsiveness and prolactin-responsiveness of a mammary cell line seem to be coupled: some mammary cell lines are responsive to both agents and some others do not respond to either one of them. When Etn-responsive cells grow in Etn-deficient medium, phosphatidylethanolamine (PE) content in membrane phospholipid significantly reduces, suggesting that Etn-responsive cells can not synthesize or maintain adequate amounts of PE without the exogenous Etn, and that the PE-deficient membrane is not suitable for proper biological functions. Our immediate objective is 1) to elucidate the biochemical mechanism of Etn-responsiveness and 2) to examine the effect of PE-deficiency on prolactin action and other aspects of cellular metabolism. Etn-responsive and -nonresponsive rat mammary carcinoma cell lines will be used for the study. To achieve the first objective, various synthetic and turnover processes of PE will be examined. These include the examination of the activities of phosphatidylserine decarboxylase and enzymes that incorporate Etn into PE, the role of sphingomyelin and choline on PE synthesis, and the synthetic/turnover rate of individual phospholipids. To achieve the second objective, we will examine prolactin, insulin and phorbol ester bindings; active transport; macromolecular synthesis; and membrane associated enzyme activities of Etn-responsive cells grown in the presence or absence of Etn. These studies will contribute in understanding the role of the membrane phospholipids, particularly of PE, in regulation of various cellular metabolic processes, cell proliferation and differentiation.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
5R01CA030545-04
Application #
3169298
Study Section
Cellular Biology and Physiology Subcommittee 1 (CBY)
Project Start
1984-07-01
Project End
1988-06-30
Budget Start
1987-07-01
Budget End
1988-06-30
Support Year
4
Fiscal Year
1987
Total Cost
Indirect Cost
Name
University of Colorado at Boulder
Department
Type
Schools of Arts and Sciences
DUNS #
City
Boulder
State
CO
Country
United States
Zip Code
80309
Kano-Sueoka, T; Nicks, M E (1993) Abnormal function of protein kinase C in cells having phosphatidylethanolamine-deficient and phosphatidylcholine-excess membranes. Cell Growth Differ 4:533-7
Fisk, H A; Kano-Sueoka, T (1992) Effect of membrane phosphatidylethanolamine-deficiency/phosphatidylcholine-excess on the metabolism of phosphatidylcholine and phosphatidylethanolamine. J Cell Physiol 153:589-95
Kano-Sueoka, T; Watanabe, T; Miya, T et al. (1991) Analysis of cytosolic phosphoethanolamine and ethanolamine and their correlation with prognostic factors in breast cancer. Jpn J Cancer Res 82:829-34
Kano-Sueoka, T; King, D M; Fisk, H A et al. (1990) Binding of epidermal growth factor to its receptor is affected by membrane phospholipid environment. J Cell Physiol 145:543-8
van der Haegen, B A; Ham, R G; Kano-Sueoka, T (1989) Growth of rat mammary tumor line 64-24 in liposome-supplemented defined medium. II. Effect of liposome B and prolactin on colony forming efficiency. In Vitro Cell Dev Biol 25:158-62
van der Haegen, B A; Ham, R G; Kano-Sueoka, T (1989) Growth of rat mammary tumor line 64-24 in liposome-supplemented defined medium. I. Effect of liposome B components on colony growth. In Vitro Cell Dev Biol 25:151-7
Kano-Sueoka, T; King, D M (1988) Effects of phosphatidylethanolamine and phosphatidylcholine in membrane phospholipid on binding of phorbol ester in rat mammary carcinoma cells. Cancer Res 48:1528-32
Kano-Sueoka, T; King, D M (1988) Insufficiency of transformation by simian virus 40, polyomavirus, EJ-ras, or v-myc oncogenes for conversion of ethanolamine-responsive mammary cells to ethanolamine-nonresponsive cells. J Virol 62:3201-9
Kano-Sueoka, T; King, D M (1987) Phosphatidylethanolamine biosynthesis in rat mammary carcinoma cells that require and do not require ethanolamine for proliferation. J Biol Chem 262:6074-81