中国神经再生研究(英文版) ›› 2023, Vol. 18 ›› Issue (2): 382-388.doi: 10.4103/1673-5374.346546

• 原著:视神经损伤修复保护与再生 • 上一篇    下一篇

外源性脑源性神经营养因子对淀粉样β蛋白1-40致视网膜变性的神经保护

  

  • 出版日期:2023-02-15 发布日期:2022-08-08

Neuroprotective effects of exogenous brain-derived neurotrophic factor on amyloid-beta 1–40-induced retinal degeneration

Mohd Aizuddin Mohd Lazaldin1, Igor Iezhitsa2, 3, *, Renu Agarwal2, Puneet Agarwal2, Nafeeza Mohd Ismail4   

  1. 1Department of Biosciences, Faculty of Science, Universiti Teknologi Malaysia, Johor Bahru, Malaysia; 2School of Medicine, International Medical University, Kuala Lumpur, Malaysia; 3Department of Pharmacology and Bioinformatics, Volgograd State Medical University, Volgograd, Russia; 4Faculty of Medicine, Universiti Teknologi MARA, Sungai Buloh Campus, Selangor, Malaysia
  • Online:2023-02-15 Published:2022-08-08
  • Contact: Igor Iezhitsa, PhD, iezhitsa@yandex.ru.
  • Supported by:
    This study was supported by the Ministry of Higher Education, Government of Malaysia, No. FRGS/2/2014/SG03/UITM/02/2 [UiTM IRMI file No. 600-RMI/FRGS 5/3 (111/2014), to II] and Yayasan Penyelidikan Otak, Minda dan Neurosains Malaysia (YPOMNM), No. YPOMNM/2019-04(2) [UiTM IRMI No. 100-IRMI/PRI 16/6/2 (010/2019), to MAML].

摘要:

淀粉样β蛋白在青光眼患者视网膜中的改变与在阿尔茨海默病患者的大脑改变相似。脑源性神经营养因子(BDNF)的水平下降与淀粉样β蛋白(Aβ)的神经毒性作用有关。为了解脑源性神经营养因子对淀粉样β1-40蛋白(Aβ1-40)诱导的Sprague Dawley大鼠视网膜损伤的神经保护作用机制,实验随机给予大鼠玻璃体内注射磷酸盐缓冲溶液(对照)、Aβ1-40(5 nM)或Aβ1-40(5 nM)+脑源性神经营养因子(1 µg/mL)。结果显示:(1)玻璃体内注射Aβ1-40诱发了视网膜神经节细胞的凋亡。(2)荧光金染色显示Aβ1-40组的存活的视网膜神经节细胞数量明显低于对照组和脑源性神经营养因子干预组。在Aβ1-40组,视网膜神经节细胞数量减少与caspase-3的表达增加和TrkB和ERK1/2的表达减少有关。(3)脑源性神经营养因子抑制了Aβ1-40诱导的视网膜中caspase-3在基因和蛋白水平的表达增加,并上调了TrkB和ERK1/2的表达。这些结果表明,脑源性神经营养因子治疗可以通过激活BDNF-TrkB信号通路,减少视网膜神经节细胞凋亡,对Aβ1-40诱导视网膜损伤起到神经保护作用。

https://orcid.org/0000-0002-2852-8486 (Igor Iezhitsa)

Abstract: Amyloid-beta (Aβ)-related alterations, similar to those found in the brains of patients with Alzheimer’s disease, have been observed in the retina of patients with glaucoma. Decreased levels of brain-derived neurotrophic factor (BDNF) are believed to be associated with the neurotoxic effects of Aβ peptide. To investigate the mechanism underlying the neuroprotective effects of BDNF on Aβ1–40-induced retinal injury in Sprague-Dawley rats, we treated rats by intravitreal administration of phosphate-buffered saline (control), Aβ1–40 (5 nM), or Aβ1–40 (5 nM) combined with BDNF (1 µg/mL). We found that intravitreal administration of Aβ1–40 induced retinal ganglion cell apoptosis. Fluoro-Gold staining showed a significantly lower number of retinal ganglion cells in the Aβ1–40 group than in the control and BDNF groups. In the Aβ1–40 group, low number of RGCs was associated with increased caspase-3 expression and reduced TrkB and ERK1/2 expression. BDNF abolished Aβ1–40-induced increase in the expression of caspase-3 at the gene and protein levels in the retina and upregulated TrkB and ERK1/2 expression. These findings suggest that treatment with BDNF prevents RGC apoptosis induced by Aβ1–40 by activating the BDNF-TrkB signaling pathway in rats.

Key words: amyloid-beta 1–40, brain-derived neurotrophic factor, Fluoro-Gold, neuroprotection, retinal ganglion cells (RGC), retinal toxicity, tropomyosin receptor kinase B (TrkB)