Modified Low-Temperature Extraction Method for Isolation of Bletilla striata Polysaccharide as Antioxidant for the Prevention of Alzheimer’s Disease |
| |
| Authors: | Yi-Wen Lin Chih-Hsiang Fang Ya-Jyun Liang Hong-Hsiang Liao Feng-Huei Lin |
| |
| Affiliation: | 1.Institute of Biomedical Engineering, National Taiwan University, Taipei 10051, Taiwan; (Y.-W.L.); (Y.-J.L.); (H.-H.L.);2.Trauma and Emergency Center, China Medical University Hospital, Taichung City 404332, Taiwan;3.Institute of Biomedical Engineering and Nanomedicine Research, National Health Research Institutes, No. 35, Keyan Road, Miaoli County 35053, Taiwan |
| |
| Abstract: | Amyloid-β (Aβ) peptides play a key role in Alzheimer’s disease (AD), the most common type of dementia. In this study, a polysaccharide from Bletilla striata (BSP), with strong antioxidant and anti-inflammatory properties, was extracted using a low-temperature method and tested for its efficacy against AD, in vitro using N2a and BV-2 cells, and in vivo using an AD rat model. The characterization of the extracted BSP for its molecular structure and functional groups demonstrated the effectiveness of the modified method for retaining its bioactivity. In vitro, BSP reduced by 20% reactive oxygen species (ROS) levels in N2a cells (p = 0.0082) and the expression levels of inflammation-related genes by 3-fold TNF-α (p = 0.0048), 4-fold IL-6 (p = 0.0019), and 2.5-fold IL-10 (p = 0.0212) in BV-2 cells treated with Aβ fibrils. In vivo, BSP recovered learning memory, ameliorated morphological damage in the hippocampus and cortex, and reduced the expression of the β-secretase protein in AlCl3-induced AD rats. Collectively, these findings demonstrated the efficacy of BSP for preventing and alleviating the effects of AD. |
| |
| Keywords: | Alzheimer’ s disease Bletilla striata amyloid-β oxidative stress anti-inflammation aluminum chloride |
|
|
