中国神经再生研究(英文版) ›› 2024, Vol. 19 ›› Issue (10): 2299-2309.doi: 10.4103/1673-5374.391193

• 原著:视神经损伤修复保护与再生 • 上一篇    下一篇

p38 MAPK通路抑制剂 SB202190 抑制视网膜兴奋毒性青光眼模型的铁死亡

  

  • 出版日期:2024-10-15 发布日期:2024-01-29

p38 MAPK inhibitor SB202190 suppresses ferroptosis in the glutamate-induced retinal excitotoxicity glaucoma model

Lemeng Feng1, 2, 3, #, Chao Wang1, 2, 3, #, Cheng Zhang1, 2, 3, Wulong Zhang1, 2, 3, Weiming Zhu1, 2, 3, Ye He1, 2, 3, Zhaohua Xia1, 2, 3, Weitao Song1, 2, 3, *   

  1. 1National Clinical Research Center for Geriatric Diseases, Xiangya Hospital of Central South University, Changsha, Hunan Province, China; 2Eye Center of Xiangya Hospital, Central South University, Changsha, Hunan Province, China; 3Hunan Key Laboratory of Ophthalmology, Changsha, Hunan Province, China
  • Online:2024-10-15 Published:2024-01-29
  • Contact: Weitao Song, MD, wtsong1980@126.com.
  • Supported by:
    This work was supported by the National Natural Science Foundation of China, Nos. 81974132, 81770927; Hunan Provincial Health Commission, No. 20220702839; the Natural Science Foundation of Hunan Province of China, No. 2022JJ30076; National Key R&D Program of China, No. 2021YFA1101202 (all to WS).

摘要:

N-甲基-D-天冬氨酸兴奋性神经毒性已被证实在青光眼中发挥重要作用,且N-甲基-D-天冬氨酸可以诱导铁死亡。p38 丝裂原活化蛋白激酶 (MAPK) 通路抑制剂SB202190是有潜力的铁死亡抑制剂,其下游分子p53等,被证实与铁死亡相关。然而,在N-甲基-D-天冬氨酸兴奋性毒性作用下,视网膜神经节细胞中是否也发生了铁死亡,以及抑制铁死亡是否可减少N-甲基-D-天冬氨酸兴奋性毒性引起的视网膜神经节细胞损失,这些问题尚不明确。为了解N-甲基-D-天冬氨酸诱导的青光眼模型是否存在铁死亡,并探索SB202190 保护视网膜神经节细胞的机制。实验建立了N-甲基-D-天冬氨酸诱导的R28细胞兴奋毒性模型和N-甲基-D-天冬氨酸诱导的小鼠青光眼模型。体外实验发现N-甲基-D-天冬氨酸可诱导 R28 细胞中铁和过氧化脂质的积累,以及线粒体的形态变化;SB202190 可以抑制这些变化。N-甲基-D-天冬氨酸诱导p-p38 MAPK/p38 MAPK和SAT1表达水平升高,FTL,SLC7A11 和 GPX4 表达水平下降。SB202190 抑制了N-甲基-D-天冬氨酸诱导的铁死亡相关蛋白的表达。体内实验显示,SB202190 减轻了N-甲基-D-天冬氨酸诱导的大鼠视网膜神经节细胞损伤,改善视功能。以上结果说明,SB202190可以有效抑制青光眼铁死亡,同时能一定程度上减轻视网膜神经节细胞损失,其作用可能是通过调节铁死亡通路中Gpx-4,SLC7A11,FTL和SAT1实现的。说明抑制铁死亡是实现青光眼视网膜神经节细胞保护的有效途径,SB202190是有潜力的视神经保护药物。

https://orcid.org/0000-0001-6320-3209 (Weitao Song)

Abstract: Glutamate excitotoxicity has been shown to play an important role in glaucoma, and glutamate can induce ferroptosis. The p38 mitogen-activated protein kinase (MAPK) pathway inhibitor SB202190 has a potential ability to suppress ferroptosis, and its downstream targets, such as p53, have been shown to be associated with ferroptosis. However, whether ferroptosis also occurs in retinal ganglion cells in response to glutamate excitotoxicity and whether inhibition of ferroptosis reduces the loss of retinal ganglion cells induced by glutamate excitotoxicity remain unclear. This study investigated ferroptosis in a glutamate-induced glaucoma rat model and explored the effects and molecular mechanisms of SB202190 on retinal ganglion cells. A glutamate-induced excitotoxicity model in R28 cells and an N-methyl-D-aspartate-induced glaucoma model in rats were used. In vitro experiments showed that glutamate induced the accumulation of iron and lipid peroxide and morphological changes of mitochondria in R28 cells, and SB202190 inhibited these changes. Glutamate induced the levels of p-p38 MAPK/p38 MAPK and SAT1 and decreased the expression levels of ferritin light chain, SLC7A11, and GPX4. SB202190 inhibited the expression of iron death-related proteins induced by glutamate. In vivo experiments showed that SB202190 attenuated N-methyl-D-aspartate-induced damage to rat retinal ganglion cells and improved visual function. These results suggest that SB202190 can inhibit ferroptosis and protect retinal ganglion cells by regulating ferritin light chain, SAT1, and SLC7A11/Gpx4 pathways and may represent a potential retina protectant.

Key words: ferroptosis, glaucoma, glutamate excitotoxicity, p38 MAPK, retinal ganglion cell, SB202190