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The oxidative damage of lipids, protein, and DNA is known to be involved in not only chronic inflammations such as arthritis, hepatitis, nephritis, gastritis, colitis, and periodontitis but also metastasis. It has given impetus to searching for natural compounds without toxicity, which prevent the development of these diseases. The direct scavenging effects of aged black garlic extract (ABGE) were evaluated in vitro on DPPH radical, hydroxyl radical, hydrogen peroxide, and genomic DNA damage related to oxidative stress. Furthermore, its antioxidant effect on lipid peroxidation was investigated in human fibrosarcoma cells (HT1080), which were exposed to the hydroxyl radical generated by the Fenton reaction. It was observed that ABGE exhibited a greater inhibitory effect on hydrogen peroxide than other reactive oxygen species, and also blocked DNA oxidation and lipid peroxidation induced by the hydroxyl radical. The oxidative stress in live cells was also inhibited in the presence of ABGE. In addition, its inhibitory effects on the activity and expression of MMP-2 and -9 related to metastasis were determined using gelatin zymography and western blot. The data showed that it inhibited MMP-2 and -9 in PMA-stimulated HT1080 cells. Therefore, these results suggest that ABGE show potential as an excellent agent for prevention of metastasis related to oxidative stress.

In vitro Inhibitory Effect of Aged Black Garlic Extract with Antioxidant Activity on MMP-2 and MMP-9 Related to Metastasis