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 α actin fibers, as shown by immnofluorecence staining. These results indicate that the interruption of the ras/MAPK signal transduction pathway and the disorganization of α actin fibers are the main cause of manumycin A inhibition of VSMC proliferation and migration induced by PDGF.
|Number of pages||6|
|Journal||Biochemical and Biophysical Research Communications|
|Publication status||Published - Nov 2 1999|
ASJC Scopus subject areas
- Molecular Biology
- Cell Biology