• Hee-Jung Choi, Hye-Jin Jang, Tae-Wook Chung, Seung-Il Jeong, Jaeho Cha, Jun-Young Choi, Chang Woo Han, Yong-Suk Jang, Myungsoo Joo, Han-Sol Jeong, and Ki-Tae Ha.
• Division of Applied Medicine, School of Korean Medicine, Pusan National University, Yangsan, Gyeongnam 626-870, Republic of Korea.
• Fitoterapia. 2013 Apr 1; 86: 19-28.

AbstractAdvanced glycation end-products (AGEs) play a pivotal role in the development of diabetic complications by inducing inflammation. We previously reported that the fresh roots of Rehmannia glutinosa Libosch., which have been used for the treatment of diabetes in traditional Korean medicine, also have the potential to suppress AGE-mediated inflammatory response in THP-1 cells. In the present study, we isolated catalpol from R. glutinosa, and examined whether it has anti-inflammatory effects on AGE-stimulated THP-1 cells. Catalpol reduced the expression of pro-inflammatory mediates, such as monocyte chemotactic protein-1 (MCP-1), tumor necrosis factor-α (TNF-α), inducible NO synthase (iNOS), and receptor for AGE (RAGE). Promoter and electromobility shift assays showed that transcriptional activation of NF-κB was significantly reduced by catalpol treatment, while AP-1 was not. Catalpol also suppressed AGE-induced phosphorylation of mitogen activated protein (MAP) kinases, degradation of IκBα and the nuclear localization of NF-κB. Moreover, the production of intracellular reactive oxygen species (ROS) elicited by AGE was also suppressed by catalpol treatment, through dual action of reducing ROS itself and inhibiting NADPH oxidase activity. Our findings indicate that catalpol suppresses AGE-mediated inflammation by inhibiting ROS production and NF-κB activity. We suggest that catalpol, a major constituent of the fresh roots of R. glutinosa, contributes to the prevention of AGE-mediated diabetic complications.Copyright © 2013 Elsevier B.V. All rights reserved.

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