Mitochondrial protection and anti-aging activity of Astragalus polysaccharides and their potential mechanism.
The current study was performed to investigate mitochondrial protection and anti-aging activity of Astragalus polysaccharides (APS) and the potential underlying mechanism. Lipid peroxidation of liver and brain mitochondria was induced by Fe(2+)-Vit C in vitro. Thiobarbituric acid (TBA) colorimetry was used to measure the content of thiobarbituric acid reactive substances (TBARS). Mouse liver mitochondrial permeability transition (PT) was induced by calcium overload in vitro and spectrophotometry was used to measure it. The scavenging activities of APS on superoxide anion (O(2) (•-)) and hydroxyl radical (•OH), which were produced by reduced nicotinamide adenine dinucleotide (NADH)-N-Methylphenazonium methyl sulfate (PMS) and hydrogen peroxide (H(2)O(2))-Fe(2+) system respectively, were measured by 4-nitrobluetetrazolium chloride (NBT) reduction and Fenton reaction colorimetry respectively. The Na(2)S(2)O(3) titration method was used to measure the scavenging activities of APS on H(2)O(2). APS could inhibit TBARS production, protect mitochondria from PT, and scavenge O(2) (•-), •OH and H(2)O(2) significantly in a concentration-dependent manner respectively. The back of the neck of mice was injected subcutaneously with D-galactose to induce aging at a dose of 100 mg/kg/d for seven weeks. Moreover, the activities of catalase (CAT), surperoxide dismutase (SOD) and glutathione peroxidase (GPx) and anti-hydroxyl radical which were assayed by using commercial monitoring kits were increased significantly in vivo by APS. According to this research, APS protects mitochondria by scavenging reactive oxygen species (ROS), inhibiting mitochondrial PT and increasing the activities of antioxidases. Therefore, APS has the effect of promoting health.
['Li|Xing-Tai|XT|', 'Zhang|Ya-Kui|YK|', 'Kuang|Hai-Xue|HX|', 'Jin|Feng-Xin|FX|', 'Liu|De-Wen|DW|', 'Gao|Ming-Bo|MB|', 'Liu|Ze|Z|', 'Xin|Xiao-Juan|XJ|']
D000818:Animals D027883:Astragalus Plant D001921:Brain D002463:Cell Membrane Permeability D016922:Cellular Senescence D019610:Cytoprotection D008099:Liver D008297:Male D051379:Mice D008807:Mice, Inbred BALB C D008928:Mitochondria D051336:Mitochondrial Membranes D018384:Oxidative Stress D028321:Plant Preparations D011134:Polysaccharides D017382:Reactive Oxygen Species D017392:Thiobarbituric Acid Reactive Substances
anti-aging Astragalus polysaccharides mitochondria mitochondrial permeability transition reactive oxygen species antioxidant