2004年3月
ECH, an epoxycyclohexenone derivative that specifically inhibits Fas ligand-dependent apoptosis in CTL-mediated cytotoxicity
JOURNAL OF IMMUNOLOGY
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- 巻
- 172
- 号
- 6
- 開始ページ
- 3428
- 終了ページ
- 3436
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- 出版者・発行元
- AMER ASSOC IMMUNOLOGISTS
CTL eliminate cells infected with intracellular pathogens and tumor cells by two distinct mechanisms mediated by Fas ligand (FasL) and lytic granules that contain perforin and granzymes. In this study we show that an epoxycyclohexenone derivative, (2R,3R,4S)-2,3-epoxy-4-hydroxy-5-hydroxymethyl-6-(1E)-propenyl-cyclohex-5-en-1-one (ECH) specifically inhibits. the FasL-dependent killing pathway in CTL-mediated cytotoxicity. Recently, we have reported that ECH blocks activation of procaspase-8 in the death-inducing,signaling complex and thereby prevents apoptosis induced by anti-Fas Ab or soluble FasL. Consistent with this finding, ECH profoundly inhibited Fas-mediated DNA fragmentation and cytolysis of target cells induced by perforin-negative mouse CD4(+) CTL and alloantigen-specific mouse CD8(+) CTL pretreated with an inhibitor of vacuolar type H+-ATPase concanamycin A that selectively induces inactivation and proteolytic degradation of perforin in lytic granules. However, ECH barely influenced perforin/granzyme-dependent DNA fragmentation and cytolysis of target cells mediated by alloantigen-specific mouse CD8(+) CTL. The components of lytic granules and the granule exocytosis pathway upon CD3 stimulation were also insensitive to ECH. In conclusion, our present results demonstrate that ECH is a specific nonpeptide inhibitor of FasL-dependent apoptosis in CTL-mediated cytotoxicity. Therefore, ECH can be used as a bioprobe to evaluate the contributions of two distinct killing pathways in various CTL-target settings.
- リンク情報
- ID情報
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- ISSN : 0022-1767
- Web of Science ID : WOS:000220096000012