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  • Title: Resveratrol suppresses oxidised low-density lipoprotein-induced macrophage apoptosis through inhibition of intracellular reactive oxygen species generation, LOX-1, and the p38 MAPK pathway.
    Author: Guo R, Su Y, Liu B, Li S, Zhou S, Xu Y.
    Journal: Cell Physiol Biochem; 2014; 34(2):603-16. PubMed ID: 25116358.
    Abstract:
    BACKGROUND/AIM: Resveratrol (RSV) may have therapeutic potential for various diseases. Here we investigated the effect of RSV on oxidised low-density lipoprotein- (ox-LDL) induced apoptosis in RAW264.7 macrophages. METHODS: Apoptosis of macrophages following incubation with ox-LDL (with or without RSV pre-treatment) was detected by flow cytometry. Western blotting was used to assess the protein expression of Bax, Bcl-2, and caspase-3 as well as ox-LDL receptor 1 (LOX-1) and p38 mitogen-activated protein kinase (MAPK) phosphorylation. Reactive oxygen species (ROS) generation was evaluated by 2', 7'-dichlorofluorescein diacetate, and JC-1 probe was used to determine the mitochondrial transmembrane potential of cells. RESULTS: Ox-LDL significantly reduced viability and increased the rate of apoptosis (P < 0.05) in RAW264.7 cells. However, pre-treatment with RSV resulted in a remarkable decrease in this apoptotic effect. Moreover, ox-LDL caused the up-regulation of Bax and the down-regulation of Bcl-2, as well as the activation of caspase-3. Expression of LOX-1, phosphorylation of p38 MAPK, and intracellular ROS production also increased after ox-LDL stimulation. Strikingly, these effects were abolished by pre-treatment of cells with RSV. CONCLUSION: RSV suppresses ox-LDL-induced macrophage apoptosis. These beneficial effects might be exerted through inhibition of ROS generation, LOX-1, and the p38 MAPK signalling pathway.
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