Journal of Functional Foods (Aug 2023)

Ameliorative effect of black raspberry anthocyanins on diabetes retinopathy by inhibiting axis protein tyrosine phosphatase 1B-endoplasmic reticulum stress

  • Ting Xiao,
  • Yuan Zhi,
  • Fangfang Tian,
  • Feilong Huang,
  • Xingyan Cheng,
  • Ai Wu,
  • Ling Tao,
  • Zhenghong Guo,
  • Xiangchun Shen

Journal volume & issue
Vol. 107
p. 105696

Abstract

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Diabetes retinopathy (DR) is a common complication associated with diabetes. This study aimed to investigate ameliorative effect of black raspberry anthocyanins (BRAs) on DR and underlying inhibition mechanism of protein tyrosine phosphatase 1B (PTP1B)-endoplasmic reticulum stress (ERS) with retinal pigment epithelial cells apoptosis exposed to high glucose and tunicamycin and DR rats induced by STZ and high-fat and high-sugar diet. The results showed that TG and TC levels were markedly decreased, and disarrangement of retinas was markedly improved after BRA administration. Moreover, after pre-incubation with BRAs, morphological changes and mitochondrial membrane potential were significantly improved, whereas the apoptosis rates, activities of PTP1B and Caspase-1, and reactive oxygen species levels were significantly decreased. Finally, BRAs exhibited an efficient combination with GRP78, and they significantly suppressed protein expression of axis PTP1B-ERS. The results offer a basis for mastering ameliorated DR with BRAs and further first enhanced the mechanism of inhibiting axis PTP1B-ERS.

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