Activation of c-jun N-terminal kinase by human granulocyte macrophage-colony stimulating factor in BA/F3 cells

被引:14
作者
Liu, R [1 ]
Itoh, T [1 ]
Arai, K [1 ]
Watanabe, S [1 ]
机构
[1] UNIV TOKYO,INST MED SCI,DEPT MOL & DEV BIOL,MINATO KU,TOKYO 108,JAPAN
关键词
D O I
10.1006/bbrc.1997.6643
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
Human granulocyte-macrophage colony-stimulating factor (hGM-CSF) induces various signaling events in hematopoietic cells. We reported that there are at least two distinct pathways of hGM-CSF signals, one for activation of proliferation and the other one for activation of c-fos promoter through the MAPK cascade. Activation of other members of the MAPK family, c-Jun N-terminal kinase (JNK) and p38 MAPK under various cellular stress have also been reported. We found that hGM-CSF activates JNK in BA/F3 cells expressing the hGM-CSF receptor (hGMR) and that activation depends on a membrane proximal region including box1 and requires a more membrane distal region of hGMR beta subunit (beta c) There are 8 known tyrosine (tyr) residues in the cytoplasmic region of beta c. Mutant beta c lacking all the tyr residues hardly activates JNK, thereby indicating that the tyr residue(s) is essential for the activation of JNK. Mutation analyses of each tyr residue indicated that none of the tyr residues seems essential for the activation of JNK, indicating multiple tyr residues play a similar function to transduce signals for this activation. (C) 1997 Academic Press.
引用
收藏
页码:611 / 615
页数:5
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