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PROGRAMMING FOR LYSIS STAGE IN NK CYTOTOXICITY

NK 细胞毒性裂解阶段的编程

基本信息

批准号：
3185065
负责人：
BENJAMIN BONAVIDA
金额：
$ 14.57万
依托单位：
UNIVERSITY OF CALIFORNIA LOS ANGELES
依托单位国家：
美国
项目类别：
财政年份：
1987
资助国家：
美国
起止时间：
1987-07-01 至 1992-12-31
项目状态：
已结题

项目摘要

The overall objective of our studies is to investigate the underlying mechanisms by which NK cells initiate their cytotoxic activity against sensitive target cells. It has been implicated that cytolysis by NK cell is a secretory process and more recently soluble cytotoxic mediators have been reported by us and others and have been postulated to be involved in the lethal hit stage of lysis. We have formulated a model which accounts for most known characteristics of NK CMC and in which natural killer cytotoxic factors (NKCF) play a role. We propose to examine the activation or trigger stage of NK by target cells (TC) resulting in target cell cytotoxicity. Our preliminary findings have identified a mechanism involving the polyphosphoinositol hydrolysis cascade and protein kinase activation. Accordingly, this proposal will examine pathways of NK activation and initiate studies on the nature of structures of NK involved in the trigger. Our studies will be done in parallel in both the NK CMC reaction and NKCF production. Studies will be done with purified sub-populations of NK and at the single cell level. Our specific aims are (1) To characterize the initial pathway of activation of NK cells by NK target cells. This will include the role of GTP binding proteins, phosphodiesterase activation, the phosphatidylinositol pathway, Ca++ mobilization, protein kinase C activation and phosphorylation, and membrane depolarization. These studies will be correlated with secretion of NKCF or antigenically TNF-like molecules in NKCF; (2) To define the nature of NK effector cell membranes involved in activation and determine whether recognition/binding alone is sufficient for activation. This will be accomplished by using non-lytic conjugating NK cells, target cell variants and blocking monoclonal antibodies. The studies above will be done with a method developed by us to purify NK killer and non-killer cells separated by sorting on a flow cytometer. Furthermore, activation will be correlated with secretion using sensitive bioassay and radioimmunoassay techniques for NKCF and TNF.

我们研究的总体目标是调查

项目成果

期刊论文数量（13）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Internucleosomal DNA cleavage precedes diphtheria toxin-induced cytolysis. Evidence that cell lysis is not a simple consequence of translation inhibition.

DOI：
发表时间：
1989-09
期刊：
The Journal of biological chemistry
影响因子：
0
作者：
Michael;Chang;John BramhallQII;Scott Graves;Benjamin Bonavida;Bernadine J. WisnieskiS
通讯作者：
Michael;Chang;John BramhallQII;Scott Graves;Benjamin Bonavida;Bernadine J. WisnieskiS

Calcium-independent pathway of tumor necrosis factor-mediated lysis of target cells.

肿瘤坏死因子介导的靶细胞裂解的钙独立途径。