Aims: The association between diabetes and neointimal expansion after vascular injury has been attributed to the accumulation of advanced glycation end products (AGEs). Here we investigated the inhibitory effect of cariporide, a specific Na+/H+ exchanger 1 blocker, on neointimal proliferation induced by AGEs in a balloon injury model. Methods: Expression of cyclooxygenase-2 (COX-2) and matrix metalloproteinase (MMP) was monitored by reverse transcription-polymerase chain reaction (RT-PCR) and real-time PCR. The level of reactive oxygen species (ROS) was determined by specific fluorescent probe. The phosphorylation of the nuclear factor-ĸB (NF-ĸB) system was studied by Western blot. Results: Cariporide significantly suppressed AGE-induced neointimal hyperplasia, vascular smooth muscle cell (VSMC) proliferation, COX-2, MMP-2 and MMP-9 expression. In addition, cariporide decreased AGE-induced ROS, malondiadehyde level and increased the superoxide dismutase and glutathione peroxidase activity. We also found that cariporide blocked AGE-induced NF-ĸB activation and inhibitor-ĸB degradation. Conclusions: The results indicated that cariporide inhibited AGE-induced neointimal formation by suppressing the VSMC proliferation and the up-regulation of COX-2, MMP-2, MMP-9 via inhibiting ROS and NF-ĸB activation.

Keywords:
Nuclear factor-ĸB, Neointimal formation, Oxidative stress, Advanced glycation end products, Na+/H+ exchanger 1
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2013
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