Localization, implications for function, and gene expression of chymotrypsin-like proteinases of cytotoxic RNK-16 lymphocytes.
Localization, implications for function, and gene expression of chymotrypsin-like proteinases of cytotoxic RNK-16 lymphocytes.
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细胞毒性 RNK-16 淋巴细胞胰凝乳蛋白酶样蛋白酶的定位、对功能的影响和基因表达。
DOI:
10.1016/0304-4165(88)90095-5
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发表时间:
1988
期刊:
影响因子:
--
通讯作者:
Hudig,D
中科院分区:
文献类型:
--
作者:
Zunino,SJ;Allison,NJ;Kam,CM;Powers,JC;Hudig,D
Rat RNK-16 leukemia cells kill YAC-1, which are the cells lysed by rodent natural killer lymphocytes. We found chymotrypsin-like proteinase (‘chymase’) activity in the RNK-16 dense granules that also contain cytolytic activity. The chymase activity hydrolyzed the thiobenzyl peptide substrate Suc-Phe-Leu-Ohe-SBzl and, in comparison to RNK-16 tryptase activity, was selectively inhibited by three different types of serine proteinase inhibitors. The selective inhibitors were the fungal aldehyde chymostatin, the chloromethylketone Z-Gly-Leu-Phe-CH2Cl, and the mechanism-based or ‘suicide’ inhibitor 7-amino-4-chloro-3-(2-phenylethoxy)isocoumarin. These proteinase inhibitors also blocked RNK-16 granule-mediated cytolysis. Chymostatin, a reversible inhibitor, delayed granule-mediated cytolysis, whereas the irreversible chloromethylketone and isocoumarin proteinase inhibitors completely abrogated granule-mediated cytolysis. The two irreversible inhibitors displayed biphasic inhibition of the chymase activity, indicating that at least two chymases are present in the granules. By Northern blot analysis, we found that RNK-16 mRNA hybridized strongly with a cDNA probe of CCPI, a mouse cytotoxic T lymphocyte serine proteinase gene. These data imply that chymase activity in the cytotoxic granules is important for cytolytic function and is likely to belong to a new subfamily of serine proteinases.
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影响因子:
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作者:
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影响因子:
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作者:
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DOI:
10.1016/0006-291x(87)90490-6
发表时间:
1987
影响因子:
3.1
作者:
Hudig,D;Gregg,NJ;Kam,CM;Powers,JC
通讯作者:
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