Abstract:
:Restenosis after angioplasty is thought to be caused by proliferation and migration of vascular smooth muscle cells (VSMCs), and it is a most serious problem in medical treatment. A low dose (50 ng/ml) of manumycin A, an inhibitor of p21(ras) (ras) farnesylation, significantly inhibited proliferation of rat VSMCs stimulated by the platelet-derived growth factor (PDGF). The mitoinhibitory effect of manumycin A was dose- and time-dependent but was independent of cell density. Western blot analysis showed that manumycin A reduced the amount of functional ras localized at the cytoplasmic membrane and inhibited the phosphorylation of p42/44 mitogen-activated protein kinase (MAPK). Manumycin A also inhibited VSMC migration and disorganized alpha actin fibers, as shown by immnofluorecence staining. These results indicate that the interruption of the ras/MAPK signal transduction pathway and the disorganization of alpha actin fibers are the main cause of manumycin A inhibition of VSMC proliferation and migration induced by PDGF.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Kouchi H,Nakamura K,Fushimi K,Sakaguchi M,Miyazaki M,Ohe T,Namba Mdoi
10.1006/bbrc.1999.1546subject
Has Abstractpub_date
1999-11-02 00:00:00pages
915-20issue
3eissn
0006-291Xissn
1090-2104pii
S0006-291X(99)91546-2journal_volume
264pub_type
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