Induction of angiogenesis by a fragment of human tyrosyl-tRNA synthetase.

被引:106
作者
Wakasugi, K
Slike, BM
Hood, J
Ewalt, KL
Cheresh, DA
Schimmel, P
机构
[1] Scripps Res Inst, Dept Chem, La Jolla, CA 92037 USA
[2] Scripps Res Inst, Dept Mol Biol, La Jolla, CA 92037 USA
[3] Scripps Res Inst, Dept Immunol, La Jolla, CA 92037 USA
[4] Scripps Res Inst, Dept Vasc Biol, La Jolla, CA 92037 USA
[5] Skaggs Inst Chem Biol, La Jolla, CA 92037 USA
关键词
D O I
10.1074/jbc.C200126200
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The first step of protein synthesis is catalyzed by aminoacyl-tRNA synthetases. In addition, certain mammalian tRNA synthetases link protein synthesis to cytokine signaling pathways. In particular, human tyrosyl-tRNA synthetase (TyrRS) can be split by proteolysis into two fragments having distinct cytokine activities. One of the TyrRS fragments (mini TyrRS) contains features identical to those in CXC chemokines (like interleukin-8) that also act as angiogenic factors. Here mini TyrRS (but not full-length TyrRS) is shown to stimulate chemotaxis of endothelial cells in vitro and stimulate angiogenesis in each of two in vivo animal models. The angiogenic activity of mini TyrRS can be opposed by anti-angiogenic chemokines like IP-10. Thus, a biological fragment of human tyrosyl-tRNA synthetase links protein synthesis to regulation of angiogenesis.
引用
收藏
页码:20124 / 20126
页数:3
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