Abstract
Aim
To investigate the effects of the sensitizer rosiglitazone on the proliferation of vascular smooth muscle cell (VSMC) induced by high glucose administration.
Methods
VSMCs were isolated from rat thoracic aortas and cultured in 10% fetal bovine serum (FBS). VSMC proliferation was evaluated by methylthiazolyldiphenyl-tetrazolium bromide (MTT) assay and cell counting. The cell cycle was examined by flow cytometry. The protein expressions of proliferating cell nuclear antigen (PCNA) and matrix metalloproteinases-2 (MMP-2) were evaluated by Western blotting. MMP-2 mRNA expression was analyzed by reverse transcription-polymerase chain reaction (RT-PCR) and gelatinolytic activity was determined by zymography.
Results
Promoted VSMC proliferation significantly increased the number of VSMCs in the S phase, the expressions of PCNA and MMP-2, and MMP-2 activity, as well as decreased the proportion of VSMCs in the G0/G1 phase. Rosiglitazone at a concentration of 10 μmol/L markedly inhibited glucose-induced VSMC proliferation (1.869 ± 0.22 vs 0.820 ± 0.15, P < 0.01). Concomitantly, rosiglitazone inhibited PCNA expression (0.96 ± 0.07 vs 0.75 ± 0.06, P < 0.05) and cell cycle progression from G0/G1 to S phase (the proportion of VSMCs in the G0/G1 and S phase were 69.6 ± 3.96% vs 84.3 ± 1.73% and 25.2 ± 1.73% vs 10.1 ± 1.42% (P < 0.01), respectively). Furthermore, rosiglitazone significantly decreased MMP-2 mRNA expression (0.98 ± 0.08 vs 0.71 ± 0.05, P < 0.05), protein expression (0.80 ± 0.04 vs 0.64 ± 0.03, P < 0.05) and MMP-2 activity (320 ± 25% vs 248 ± 21%, P < 0.05).
Conclusion
Rosiglitazone significantly inhibited VSMC proliferation, at least in part by inhibiting high glucose-induced G1→S phase transition, PCNA expression and MMP-2 synthesis.
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Acknowledgments
The authors are indebted to Dr. Xuefeng Xia (University of Texas-Houston Health Science Center) for his valuable help in the preparation of the manuscript. This study was supported by grants from the Department of Education of Hunan Province (NO. 05C465), the National Natural Science Foundation of China (30770868), the National Major Basic Research Program (973 program) (2006CB503808) and the Natural Science Foundation of Hunan Province (NO. 01JJY2147).
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Hong-Yan Ling and Bi Hu contributed equally to this work.
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Ling, HY., Hu, B., Wang, BX. et al. Effects of Rosiglitazone on the Proliferation of Vascular Smooth Muscle Cell Induced by High Glucose. Cardiovasc Drugs Ther 22, 453–460 (2008). https://doi.org/10.1007/s10557-008-6127-6
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DOI: https://doi.org/10.1007/s10557-008-6127-6