title: Accelerated onset of senescence of endothelial progenitor cells in patients with type 2 diabetes mellitus: role of dimethylarginine dimethylaminohydrolase 2 and asymmetric dimethylarginine.
abstract: The risk of cardiovascular complications in diabetic patients is mainly associated with endothelial dysfunction. Reduced number of EPCs and impaired function of EPCs in diabetes result in imbalance of endothelial homeostasis and dysfunction of vessels. In patients with diabetes mellitus, plasma levels of asymmetric dimethylarginine (ADMA) were elevated, while the expression and activity of dimethylarginine dimethylaminohydrolase (DDAH) were reduced. In the present study, we investigated the role of the DDAH2/ADMA pathway in the senescence of EPCs in type 2 diabetic patients and cultured EPCs treated with high glucose. The results showed that the percentage of senescent EPCs increased while the expression of DDAH2 decreased concomitantly with an increase in the plasma levels of ADMA in patients with type 2 diabetes mellitus (T2DM). Similar results were seen in cultured EPCs treated with high glucose. Exogenous application of ADMA accelerated the senescence of EPCs in a dose-dependent manner, and overexpression of DDAH2 inhibited high glucose-induced EPCs senescence. In addition, it has also been reported that DDAH/ADMA pathway is regulated by silent information regulator 1 (SIRT1) in endothelial cell. In the present study, we found decreased expression of SIRT1 both in T2DM patients and EPCs pretreated with high glucose. And resveratrol (activating SIRT1) inhibited high glucose-induced EPCs senescence by upregulating the expression of DDAH2 and decreasing the levels of ADMA. Taken together, we concluded that DDAH2/ADMA is involved in the accelerated senescence of EPCs in diabetes, which is associated with the activation of SIRT1.
authors.affiliation: Department of Pharmacology, School of Pharmaceutical Science, Central South University, Changsha, Hunan 410078, China; Department of Pharmacology, Medical College, Wuhan University of Science and Technology, Wuhan 430081, China.
authors.forename: Qiong
authors.initials: Q
authors.lastname: Yuan
authors.affiliation: Department of Pharmacology, School of Pharmaceutical Science, Central South University, Changsha, Hunan 410078, China.
authors.forename: Chang-Ping
authors.initials: CP
authors.lastname: Hu
authors.affiliation: Department of Pharmacy, Xiangya Hospital, Central South University, Changsha 410008, China.
authors.forename: Zhi-Cheng
authors.initials: ZC
authors.lastname: Gong
authors.affiliation: Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha 410078, China.
authors.forename: Yong-Ping
authors.initials: YP
authors.lastname: Bai
authors.affiliation: Department of Pharmacology, School of Pharmaceutical Science, Central South University, Changsha, Hunan 410078, China.
authors.forename: Si-Yu
authors.initials: SY
authors.lastname: Liu
authors.affiliation: Department of Pharmacology, School of Pharmaceutical Science, Central South University, Changsha, Hunan 410078, China.
authors.forename: Yuan-Jian
authors.initials: YJ
authors.lastname: Li
authors.affiliation: Department of Pharmacology, School of Pharmaceutical Science, Central South University, Changsha, Hunan 410078, China. Electronic address: junlinjiang@csu.edu.cn.
authors.forename: Jun-Lin
authors.initials: JL
authors.lastname: Jiang
mesh_terms: D000581:Amidohydrolases / Q000378:metabolism*; D001120:Arginine / Q000031:analogs & derivatives* / Q000097:blood / Q000378:metabolism; D016922:Cellular Senescence; D003924:Diabetes Mellitus, Type 2 / Q000097:blood / Q000201:enzymology* / Q000378:metabolism / Q000473:pathology*; D066026:Endothelial Progenitor Cells / Q000378:metabolism / Q000473:pathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D056564:Sirtuin 1 / Q000378:metabolism
chemical_list: C018524:N,N-dimethylarginine; D001120:Arginine; D000581:Amidohydrolases; C447939:SIRT1 protein, human; D056564:Sirtuin 1; C059999:dimethylargininase
keywords: Asymmetric dimethylarginine; Dimethylarginine dimethylaminohydrolase; Endothelial progenitor cell; Silent information regulator 1; Type 2 diabetes mellitus