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KMID : 1206220060130020129
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Journal of Korean Academy of Physical Therapy Science
2006 Volume.13 No. 2 p.129 ~ p.135
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c-Jun N-terminal Kinase Contributes to Norepinephrine-Induced Contraction Through Phosphorylation of Caldesmon in Rat Aortic Smooth Muscle
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Lee Youn-Ri
Kim Jae-Heung
Lee Keun-Sang
Lee Yun-Lyul
Min Kyung-Ok
Kim Bo-Kyung
Lee Chang-Kwon
Park Hyo-Jun
Kim Hyo-Jin
Kim Jung-Hwan
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Abstract
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Vascular smooth muscle contraction is mediated by activation of extracellular signal-regulated kinase (ERK) 1/2, an isoform of mitogen-activated protein kinase (MAPK). However, the role of stress-activated protein kinase/c-Jun N-terminal kinase (JNK) in vascular smooth muscle contraction has not been defined. We investigated the role of JNK in the contractile response to norepinephrine (NE) in rat aortic smooth muscle. NE evoked contraction in a dose-dependent manner, and this effect was inhibited by the JNK inhibitor SP600125. NE increased the phosphorylation of JNK, which was greater in aortic smooth muscle from hypertensive rats than from normotensive rats. NE-induced JNK phosphorylation was significantly inhibited by SP600125 and the conventional-type PKC (cPKC) inhibitor Go6976, but not by the Rho kinase inhibitor Y27632 or the phosphatidylinositol 3-kinase inhibitor LY294002. Thymeleatoxin, a selective activator of cPKC, increased JNK phosphorylation, which was inhibited by . SP600125 attenuated the phosphorylation of caldesmon, an actin-binding protein whose phosphorylation is increased by NE. These results show that JNK contributes to NE-mediated contraction through phosphorylation of caldesmon in rat aortic smooth muscle, and that this effect is regulated by the PKC pathway, especially cPKC.
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KEYWORD
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c-Jun N-terminal kinase, mitogen-activated protein kinase, vascular smooth muscle contraction, caldesmon, hypertension
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