基质金属蛋白酶
p38丝裂原活化蛋白激酶
MAPK/ERK通路
激酶
信号转导
细胞外基质
丝裂原活化蛋白激酶
细胞生物学
免疫印迹
血管平滑肌
蛋白激酶A
化学
医学
内分泌学
生物
内科学
生物化学
基因
平滑肌
作者
Florian Grabellus,Karl Worm,Kurt Werner Schmid
标识
DOI:10.1016/j.prp.2007.01.001
摘要
Matrix metalloproteinases (MMPs) play an important role in vascular remodeling and cardiovascular diseases by degrading extracellular matrix. Regulation of MMPs can be mediated by mitogen-activated protein kinases (MAPKs). Effects of pressure application on the proteolytic activity of MMP-2 and MAPK pathways were investigated in an organ culture of porcine muscular arteries. Inhibition of MAPKs (ERK1/2 and p38 MAPK) was carried out to prove their effects on MMP-2 activation. After tensile stress, activity and gene expression of MMP-2 were increased (p<0.05) as shown by gelatinase assays and real-time PCR. Whereas protein expression of MMP-2 and TIMP-2 showed no changes, its regulator MT1-MMP decreased in Western blot (p<0.001) and immunohistochemistry. In addition, p38 and ERK1/2 were activated (p38, p<0.05; ERK1/2, p<0.001) by pressure. After inhibition of p38 and ERK1/2 with SB203580 or PD98059, only the inhibition of the p38 pathway had an inhibitory effect on MMP-2 gelatinolytic activity. Tensile stress activates the MMP-2 system in muscular arterial walls. This mechanical signal is mediated by p38 MAPK and can be attenuated by blocking the p38 signal pathway. The regulation of the vascular gelatinolytic system by MAP kinases suggests a therapeutic option against cardiovascular diseases at the level of MAPK signal transduction.
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