(Circulation. 2001;103:3117.)
© 2001 American Heart Association, Inc.
Basic Science Reports |
From U460 INSERM (L.J.F., M.M, A.S., J.-F.D., E.D., C.B.-C., P.G.S., M.-P.J.) and Service dAnatomo-Pathologie (D.H.), CHU Bichat, Paris, and Service de Pathologie Cellulaire/INSERM 99-24, CHU Grenoble (E.B.), France.
Correspondence to Laurent J. Feldman, MD, PhD, U460 INSERM, Faculté Xavier Bichat, 16, rue Henri Huchard, 75018 Paris, France. E-mail laurent.feldman{at}bch.ap-hop-paris.fr
BackgroundIntimal hyperplasia is the principal mechanism of in-stent restenosis. Matrix metalloproteinases (MMPs) play a key role in intimal growth after balloon angioplasty (BA). Little is known, however, about MMP expression after stent implantation (ST). We investigated whether MMP9 and MMP2 are differentially expressed after ST and BA.
Methods and
ResultsHypercholesterolemic
rabbits underwent ST and BA in the right and left iliac arteries,
respectively. The expression of MMPs and their inhibitors
(TIMPs) was studied at various time points in the injured arteries by
use of zymography, reverse transcriptionpolymerase chain reaction,
and immunohistochemistry. MMP2, but not MMP9, was constitutively
expressed in uninjured arteries. MMP9 expression was rapidly induced
after injury, whereas the increase in MMP2 expression was delayed. At
all time points, pro-MMP9 activity and MMP9 mRNA levels were
2-fold
(ANOVA, P=0.002) and
3-fold
(P<0.0001) higher after ST
than after BA, respectively. Active MMP9 was detected only after ST.
Although the increases in MMP2 mRNA levels were of similar magnitudes
after ST and BA, pro-MMP2 activity was slightly higher 7 and 30 days
after ST, and MMP2 activity was
2-fold higher 7 to 60 days after ST
(P=0.002). No difference in
TIMP expression was observed between stented and balloon-injured
arteries. Cellular distributions of MMPs and TIMP1 were similar after
ST and BA. Early inflammatory cell recruitment and 30-day intimal
growth were more severe after ST.
ConclusionsStent implantation results in more intense and sustained expression of MMP9 and activation of MMP2 than balloon angioplasty.
Key Words: metalloproteinases stents angioplasty restenosis
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