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Zeying Chu,Guanqun Ma,Xiangjun Sun,Zhihan Xu,Jianhua Zhang 한국식품영양과학회 2020 Journal of medicinal food Vol.23 No.5
Aging can cause retinal degeneration, which leads to visual impairment among the elderly population. Age-dependent increases in amyloid beta (Aβ) inducesinflammatory cytokine overexpression in the retinal pigment epithelium (RPE), which promotes the progression of age-related retinal degeneration. However, whether dietary antioxidants are useful for the treatment of RPE degeneration remains to be clarified. This study exposited the protective activities and underlying mechanisms of grape seed extracts (GSEs) against Aβ-induced proinflammatory events in mouse retinas and ARPE-19 cells. The experimental data demonstrated that GSEs attenuated the increases in messenger RNA (mRNA) levels of interleukin 12 (IL-12), interleukin 6 (IL-6), interleukin 1β (IL-1β), and interleukin 18 (IL-18) in the retinal tissues of Aβ-treated mice. The experimental results in mice were confirmed by findings in ARPE-19 cells with or without treatment with GSEs. GSEs affected the protein expression levels of endoplasmic reticulum stress markers in ARPE-19 cells exposed to Aβ. Knockdown of Bip blocked the inhibitory activities of GSEs on mRNA levels of IL-6, IL-1β, IL-18, and IL-8. We conclude that GSEs may suppress proinflammatory cytokines partly by increasing the expression of Bip.
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