Cyanidin-3-glucoside protects the photooxidative damage of retinal pigment epithelium cells by regulating sphingolipid signaling and inhibiting MAPK pathway

Tingting Liu ¹Wentao Qi ²Wenting Peng ²Jianan Zhang ³Yong Wang²

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作者信息

1. School of Health Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Academy of National Food and Strategic Reserves Administration,Beijing 100037,China
2. Academy of National Food and Strategic Reserves Administration,Beijing 100037,China
3. Department of Chemistry,University of North Carolina at Chapel Hill,Chapel Hill,NC 27599,USA
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Abstract

Cyanidin-3-glucoside(C3G)is the most common anthocyanin in dark grains and berries and is a food functional factor to improve visual health.However,the mechanisms of C3G on blue light-induced retinal pigment epithelial(RPE)cell photooxidative damage needs further exploration.We investigated the effects of C3G on blue light-irradiated A2E-containing RPE cells and explored whether sphingolipid,mitogen-activated protein kinase(MAPK),and mitochondria-mediated pathways are involved in this mechanism.Blue light irradiation led to mitochondria and lysosome damage in RPE cells,whereas C3G preserved mitochondrial morphology and function and maintained the lysosomal integrity.C3G suppressed the phosphorylation of JNK and p38 MAPK and mitochondria-mediated pathways to inhibit RPE cell apoptosis.Lipidomics data showed that C3G protected RPE cells against blue light-induced lipid peroxidation and apoptosis by maintaining sphingolipids balance.C3G significantly inhibited ceramide(Cer d 18:0/15:0,Cer d 18:0/16:0 and Cer d18:0/1 8:0)accumulation and elevated galactosylceramide(GalCer d18:1/15:0 and GalCer d 18:1/16:0)levels in the irradiated A2E-containing RPE cells.Furthermore,C3G attenuated cell membrane damage by increasing phosphatidylcholine and phosphatidylserine levels.C3G inhibited apoptosis and preserved the structure of mitochondria and lysosome by regulating sphingolipid signaling and suppression of MAPK activation in RPE cells.Thus,dietary supplementation of C3G prevents retinal photooxidative damage.

Key words

Cyanidin-3-glucoside/Ceramide/MAPK pathway/Mitochondria-dependent apoptosis/Lipidomics analysis

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基金项目

国家自然科学基金(31901698)

Young Elite Scientists Sponsorship Program by the China Association for Science and Technology(2019QNRC001)

出版年

2024

食品科学与人类健康(英文)

CSTPCD

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参考文献量50

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