Abstract
We previously reported that transforming growth factor-β (TGF-β) activates p44/p42
mitogen-activated protein (MAP) kinase and p38 MAP kinase, resulting in the stimulation
of vascular endothelial growth factor (VEGF) synthesis in osteoblast-like MC3T3-E1
cells. In the present study, we investigated the involvement of stress-activated protein
kinase/c-Jun N-terminal kinase (SAPK/JNK), another member of the MAP kinase superfamily, in TGF-β-induced
VEGF synthesis in these cells. TGF-β markedly induced SAPK/JNK phosphorylation. SP600125,
a specific inhibitor of SAPK/JNK, markedly reduced TGF-β-induced VEGF synthesis. SP600125
suppressed TGF-β-induced SAPK/JNK phosphorylation. PD98059, an inhibitor of upstream
kinase of p44/p42 MAP kinase and SB203580, an inhibitor of p38 MAP kinase, each failed
to reduce TGF-β-induced SAPK/JNK phosphorylation. A combination of SP600125 and PD98059
or SP600125 and SB203580 suppressed TGF-β-stimulated VEGF synthesis in an additive
manner. These results strongly suggest that TGF-β activates SAPK/JNK in osteoblasts,
and that SAPK/JNK plays a role in addition to p42/p44 MAP kinase and p38 MAP kinase
in TGF-β-induced VEGF synthesis.
Key words
TGF-β - VEGF - SAPK/JNK - Osteoblast
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Dr. Osamu Kozawa
Department of Pharmacology · Gifu University Graduate School of Medicine ·
Gifu 501-1194 · Japan
Phone: + 81 (58) 230-6214 ·
Fax: + 81 (58) 230-6218 ·
Email: okozawa@cc.gifu-u.ac.jp