Table of Contents Author Guidelines Submit a Manuscript
Oxidative Medicine and Cellular Longevity
Volume 2014 (2014), Article ID 320513, 13 pages
http://dx.doi.org/10.1155/2014/320513
Research Article

Saponins from Aralia taibaiensis Attenuate D-Galactose-Induced Aging in Rats by Activating FOXO3a and Nrf2 Pathways

1Department of Geriatrics, The Second Affiliated Hospital of Medicine School, The Xi’an Jiaotong University, Xi’an 710004, China
2Department of Toxicology, The Key Laboratory of Free Radical Biology and Medicine of Shaanxi Province, The Center of Prevention and Treatment on ROS-Induced Injury of FMMU, School of Preventive Medicine, The Fourth Military Medical University, Xi’an 710032, China
3School of Life Science, Shaanxi Normal University, Xi’an 710062, China

Received 26 September 2013; Revised 12 November 2013; Accepted 1 December 2013; Published 22 January 2014

Academic Editor: Antonio Ayala

Copyright © 2014 Ying-Na Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Reactive oxygen species (ROS) are closely related to the aging process. In our previous studies, we found that the saponins from Aralia taibaiensis have potent antioxidant activity, suggesting the potential protective activity on the aging. However, the protective effect of the saponins and the possible underlying molecular mechanism remain unknown. In the present study, we employed a D-galactose-induced aging rat model to investigate the protective effect of the saponins. We found that D-galactose treatment induced obvious aging-related changes such as the decreased thymus and spleen coefficients, the increased advanced glycation end products (AGEs) level, senescence-associated β-galactosidase (SAβ-gal) activity, and malondialdehyde (MDA) level. Further results showed that Forkhead box O3a (FOXO3a), nuclear factor-erythroid 2-related factor 2 (Nrf2), and their targeted antioxidants such as superoxide dismutase 2 (SOD2), catalase (CAT), glutathione reductase (GR), glutathione (GSH), glutamate-cysteine ligase (GCL), and heme oxygenase 1 (HO-1) were all inhibited in the aging rats induced by D-galactose treatment. Saponins supplementation showed effective protection on these changes. These results demonstrate that saponins from Aralia taibaiensis attenuate the D-galactose-induced rat aging. By activating FOXO3a and Nrf2 pathways, saponins increase their downstream multiple antioxidants expression and function, at least in part contributing to the protection on the D-galactose-induced aging in rats.