Pleiotropic drug resistance is characterized by alterations in cell membrane properties. It has been shown that certain chemotherapeutic agents exert antineoplastic effect at the level of membrane. Cyclosporine A (CsA) partitions into phospholipid vesicles and interferes with plasma membrane phospholipid metabolism. It has also been shown to decrease the motional freedom of membrane lipids and to depolarize plasma membrane potentials in murine lymphoctyes. The overall aim of this proposal is to understand the effects of CsA on signal transduction pathway using both neoplastic (sensitive and pleiotropic drug resistant) and normal T and EBV-induced B cell lines.
The specific aims of the study are: (1) To compare plasma membrane potentials in sensitive T and B leukemia cell lines and their corresponding drug resistant sublines, and in T and B cells lines derived from normal lymphocytes. The membrane potentials will be studied with DiOC5 dye using FACS. (2) To examine the effect of CsA on the generation of inositol trisphosphate in resistant and sensitive leukemic cell lines and T and B cell lines derived from normal lymphocytes. (3) To study the in vitro direct effect of CsA on the activation and translocation of protein kinase C (PKC) in tumor and normal lymphocyte-derived T and B cells lines. Studies will also be done to examine regulatory role of CsA on PMA-induced activation and translocation will be measured by immunoprecipitation and indirect immunofluorescence, using an alloantibody against PKC. (4) To examine the effect of CsA on membrane phosphorylation of P- 180. The studied would help in the understanding of the mechanisms of CsA on the early steps of lymphocyte activation and the mechanisms by which CsA corrects the pleiotropic drug resistance in neoplastic cells.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
1R01AI026465-01
Application #
3140213
Study Section
(SRC)
Project Start
1988-07-01
Project End
1991-06-30
Budget Start
1988-07-01
Budget End
1989-06-30
Support Year
1
Fiscal Year
1988
Total Cost
Indirect Cost
Name
University of California Irvine
Department
Type
Schools of Medicine
DUNS #
161202122
City
Irvine
State
CA
Country
United States
Zip Code
92697
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Gollapudi, S; Patel, K; Jain, V et al. (1992) Protein kinase C isoforms in multidrug resistant P388/ADR cells: a possible role in daunorubicin transport. Cancer Lett 62:69-75
Gupta, S; Shimizu, M; Ohira, K et al. (1991) T cell activation via the T cell receptor: a comparison between WT31 (defining alpha/beta TcR)-induced and anti-CD3-induced activation of human T lymphocytes. Cell Immunol 132:26-44
Gupta, S (1990) Recent developments in clinical immunology. Allergy Proc 11:105-7
Vayuvegula, B; Ohira, K; Gollapudi, S et al. (1990) Role of monocytes in anti-CD3-induced T-cell DNA synthesis: effect of chloroquine and monensin on anti-CD3-induced human T-cell activation. J Clin Immunol 10:247-54
Gollapudi, S; Gupta, S (1990) Human immunodeficiency virus I-induced expression of P-glycoprotein. Biochem Biophys Res Commun 171:1002-7
Gupta, S; Fass, D; Shimizu, M et al. (1989) Potentiation of immunosuppressive effects of cyclosporin A by 1 alpha,25-dihydroxyvitamin D3. Cell Immunol 121:290-7
Gupta, S (1989) Mechanisms of transmembrane signalling in human T cell activation. Mol Cell Biochem 91:45-50
Gupta, S (1989) Membrane signal transduction in T cells in aging humans. Ann N Y Acad Sci 568:277-82
Sutro, J B; Vayuvegula, B S; Gupta, S et al. (1989) Voltage-sensitive ion channels in human B lymphocytes. Adv Exp Med Biol 254:113-22

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