Role of reactive oxygen species in bradykinin-induced proliferation of vascular smooth muscle cells
Biol. Res
;
37(3): 419-430, 2004. graf
Article
in English
| LILACS
| ID: lil-394436
RESUMO
In addition to the induction of cell proliferation and migration, bradykinin (BK) can increase c-fos mRNA expression, activate ERK 1/2 and generate reactive oxygen species (ROS) in vascular smooth muscle cells (VSMC). It is not known, however, whether BK can induce cellular proliferation and extracellular matrix production via redox-sensitive signaling pathways. We investigated the role(s) of ROS in proliferation, migration and collagen synthesis induced by BK in VSMC derived from Sprague Dawley rat aorta. BK (10 nM) increased VSMC proliferation by 30 % (n=5); this proliferation was inhibited by the antioxidants N-acetylcysteine (20 mM) and a-lipoic acid (LA, 250 mM). In addition, BK induced an increase in cell migration and in collagen levels that were blocked by LA. ROS production induced by BK (n=10) was significantly inhibited by bisindolylmaleimide (4mM) and by PD98059 (40mM). These results suggest that 1) ROS participate in the mechanism(s) used by bradykinin to induce cellular proliferation; 2) bradykinin induces ROS generation through a pathway that involves the kinases PKC and MEK; and 3) ROS participate in the pathways mediating cell migration and the production of collagen as a response to treatment with bradykinin. To our knowledge, this is the first report describing mechanisms to explain the participation of ROS in the cellular proliferation and extracellular matrix pathway regulated by BK.
Full text:
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Index:
LILACS (Americas)
Main subject:
Bradykinin
/
Cell Division
/
Cell Movement
/
Collagen
/
Reactive Oxygen Species
/
Muscle, Smooth, Vascular
/
Antioxidants
Limits:
Animals
Language:
English
Journal:
Biol. Res
Journal subject:
Biology
Year:
2004
Type:
Article
/
Project document
Affiliation country:
Chile
/
United States
Institution/Affiliation country:
Medical University of South Carolina/US
/
Pontificia Universidad Católica de Chile/CL
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