Biochemical and growth rate changes induced in cultures of human cells by lysosomotropic agents under a variety of experimental conditions will be investigated in detail. Specific variations to be examined include whether such compounds increase nuclear concentrations of non-histone proteins (NHP) by inhibiting their degradation. Since it is known that NHP play a crucial role in cellular growth control, investigations will also be carried out to determine if the above changes on nuclear NHP correlate with quantitative variations on proliferative rates under standard laboratory conditions. A major objective of this proposal will be to determine if the working hypothesis that increased nuclear levels of NHP are a direct consequence of pharmacological inhibition of lysosomal degradation and whether the latter plays an important and until now unrecognized role in the control of cell growth. The above effects will be quantitatively compared in normal and neoplastic human cells to determine whether the altered growth rate of cells is characterized by lysosomal defects. These investigations aim to support the hypothesis that lysosomes play a role in neoplastic growth control and have potential significance on our understanding of mechanisms involved in carcinogenesis. (E)

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
5R01CA037197-02
Application #
3174988
Study Section
Pathology B Study Section (PTHB)
Project Start
1984-12-01
Project End
1987-11-30
Budget Start
1985-12-01
Budget End
1986-11-30
Support Year
2
Fiscal Year
1986
Total Cost
Indirect Cost
Name
University of Illinois at Chicago
Department
Type
Schools of Medicine
DUNS #
121911077
City
Chicago
State
IL
Country
United States
Zip Code
60612
Polet, H (1992) Effects of platelet-derived growth factor on degradation, nuclear translocation of nonhistone proteins, and DNA synthesis. Proc Soc Exp Biol Med 199:417-23
Polet, H (1990) Cytochalasin D inhibits nuclear translocation of nonhistone proteins induced by lectin and other agents in lymphocytes. Proc Soc Exp Biol Med 194:5-9
Polet, H (1990) Epidermal growth factor stimulates DNA synthesis while inhibiting cell multiplication of A-431 carcinoma cells. Exp Cell Res 186:390-3
Polet, H; Fryxell, D (1989) Effects of epidermal growth factor on protein degradation the translocation of non-histone proteins to the nucleus and DNA synthesis. Biochim Biophys Acta 1013:279-86
Polet, H; Molnar, J (1988) Demonstration that some of the nonhistone proteins, inducible to translocate into the nucleus, are glycosylated. J Cell Physiol 135:47-54
Polet, H; Swager, J S (1987) Effects of serum and conditioned medium on protein degradation, migration of nonhistone proteins to the nucleus, and DNA synthesis in transformed cells. J Cell Physiol 130:436-43
Polet, H (1987) Effects of fibroblastic growth factor on protein degradation, the migration of non-histone proteins to the nucleus and DNA synthesis in diploid fibroblasts. Exp Cell Res 169:178-90
Polet, H (1986) Endocytosed non-histone proteins translocate in part to the nucleus in lymphocytes. Exp Cell Res 166:455-64
Polet, H; Molnar, J; Goral, J (1986) The effects of amino acids on protein degradation and translocation of non-histone proteins to the nucleus in lymphocytes. Biochim Biophys Acta 886:33-9
Polet, H (1985) The effects of lysosomotropic amines on protein degradation, migration of nonhistone proteins to the nucleus, and cathepsin D in lymphocytes. J Cell Physiol 122:415-23