The objective of this proposal is to analyze the events that lead to target cell lysis by cloned killer cells from mice. Previous experiments with cloned murine natural killer (NK) cells had shown that subsequent to an apparently random binding of NK cells to their targets, a repositioning of the microtubule organizing center (MTOC) and Golgi apparatus (GA) toward the target-binding site occurs. Next, granules migrate to the target-binding site and give rise to vesicles that carry cytolytic molecules to the target membrane. The present proposal's aim is to analyze the cytolytic killing by NK cells and by specific T-killer cells. The project focuses on three individual questions: (1) Is there GA-MTOC reorientation in T-killer cells and what are the signals that induce reorientation and granular traffic to the target-binding site?; (2) Is it possible to demonstrate that cytolytic molecules are generated in the granules of killer cells and can granules be induced in a cell-free system to lyse targets, assemble cytolytic vesicles and cytolytic molecules?; and (3) Can the putative cytolytic molecules be purified and characterized in order to test their function in a cell-free system? An attempt will be made to purify and characterize the putative cytolytic molecules in order to test their function in a cell-free system. Cloned cell lines will be used for most experiments. Intracellular organelles will be visualized by fluoresceinated-specific antibody. Granules will be isolated by percoll gradient centrifugation and their function and protein composition analyzed. Cytolytic tubular complexes will be isolated by detergent solubilization followed by gel filtration. Their subunit structure will be analyzed and antibodies specific for the complexes will be raised and used for functional and biochemical analysis. (SR)

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
5R01CA039623-03
Application #
3178837
Study Section
Immunobiology Study Section (IMB)
Project Start
1985-07-01
Project End
1988-11-30
Budget Start
1987-07-01
Budget End
1988-11-30
Support Year
3
Fiscal Year
1987
Total Cost
Indirect Cost
Name
University of Southern California
Department
Type
Schools of Medicine
DUNS #
041544081
City
Los Angeles
State
CA
Country
United States
Zip Code
90033
Nemoto, E; Stohlman, S; Dennert, G (1996) Release of a glycosylphosphatidylinositol-anchored ADP-ribosyltransferase from cytotoxic T cells upon activation. J Immunol 156:85-92
Jamora, C; Dennert, G; Lee, A S (1996) Inhibition of tumor progression by suppression of stress protein GRP78/BiP induction in fibrosarcoma B/C10ME. Proc Natl Acad Sci U S A 93:7690-4
Wang, J; Nemoto, E; Dennert, G (1996) Regulation of CTL by ecto-nictinamide adenine dinucleotide (NAD) involves ADP-ribosylation of a p56lck-associated protein. J Immunol 156:2819-27
Nemoto, E; Yu, Y; Dennert, G (1996) Cell surface ADP-ribosyltransferase regulates lymphocyte function-associated molecule-1 (LFA-1) function in T cells. J Immunol 157:3341-9
Wang, J; Stohlman, S A; Dennert, G (1994) TCR cross-linking induces CTL death via internal action of TNF. J Immunol 152:3824-32
Wang, J; Nemoto, E; Kots, A Y et al. (1994) Regulation of cytotoxic T cells by ecto-nicotinamide adenine dinucleotide (NAD) correlates with cell surface GPI-anchored/arginine ADP-ribosyltransferase. J Immunol 153:4048-58
Sugawara, S; Takeda, K; Lee, A et al. (1993) Suppression of stress protein GRP78 induction in tumor B/C10ME eliminates resistance to cell mediated cytotoxicity. Cancer Res 53:6001-5
Takeda, K; Dennert, G (1993) The development of autoimmunity in C57BL/6 lpr mice correlates with the disappearance of natural killer type 1-positive cells: evidence for their suppressive action on bone marrow stem cell proliferation, B cell immunoglobulin secretion, and autoimmune sy J Exp Med 177:155-64
Sugawara, S; Kaslow, H R; Dennert, G (1993) CTX-B inhibits CTL cytotoxicity and cytoskeletal movements. Immunopharmacology 26:93-104
Kikly, K; Dennert, G (1992) Evidence for a role for T cell receptors (TCR) in the effector phase of acute bone marrow graft rejection. TCR V beta 5 transgenic mice lack effector cells able to cause graft rejection. J Immunol 149:3489-94

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