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Probucol Decreases Asymmetrical Dimethylarginine Level by Alternation of Protein Arginine Methyltransferase I and Dimethylarginine Dimethylaminohydrolase Activity

  • Basic Pharmacology – Endothelial Function
  • Published:
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Abstract

Hypothesis

Asymmetric dimethylarginine (ADMA), an endogenous nitric oxide synthase inhibitor (NOS), may play an important role in endothelium dysfunction. Probucol, a potent antioxidant drug, may improve endothelium function via reduction of NOS inhibitor level. The present study examined whether the decreased level of ADMA by probucol is related to enhancement of protein arginine methyltransferase I (PRMT I) expression and reduction of dimethylarginine dimethylaminohydrolase (DDAH) activity.

Methods

Endothelial cells were cultured and used for all these studies. ADMA concentration and DDAH activity were determined by HPLC. Expression of PRMT I and eNOS were characterized by western blot.

Results

Pretreatment with oxidized-low density lipoprotein (ox-LDL) (10, 30 or 100 μg/ml) or lysophosphatidylcholine (LPC) (1.0, 2.5 or 5.0 μg/ml) for 12, 24 or 48 h markedly increased the activity of lactate dehydrogenase (LDH) in cultured endothelial cell. Incubation ofendothelial cells with ox-LDL (100 μg/ml) or LPC (5.0 μg/ml) for 48 h significantly increased the expression of PRMT I, and levels of MDA and ADMA, and decreased the concentration of nitrite/nitrate, the expression of eNOS and the activity of DDAH. Probucol significantly decreased the level of ADMA, concomitantly with reduction of PRMT I expression and elevation of DDAH activity and up-regulation of eNOS expression.

Conclusion

In summary, the present results suggest that the protective effect of probucol on endothelium is related to reduction of ADMA concentration by inhibition of PRMT I expression and enhancement of DDAH activity.

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Authors and Affiliations

  1. Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Xiang-Ya Road #110, Changsha, Hunan, 410078, PR China

    Jun-Lin Jiang, Xiao-Hong Zhang, Nian-Sheng Li, Wei-Qing Rang,  Feng-Ye, Chang-Ping Hu, Yuan-Jian Li & Han-Wu Deng

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  1. Jun-Lin Jiang
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  2. Xiao-Hong Zhang
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Correspondence to Han-Wu Deng.

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Jiang, JL., Zhang, XH., Li, NS. et al. Probucol Decreases Asymmetrical Dimethylarginine Level by Alternation of Protein Arginine Methyltransferase I and Dimethylarginine Dimethylaminohydrolase Activity. Cardiovasc Drugs Ther 20, 281–294 (2006). https://doi.org/10.1007/s10557-006-9065-1

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