中国神经再生研究(英文版) ›› 2025, Vol. 20 ›› Issue (4): 1124-1134.doi: 10.4103/NRR.NRR-D-23-01140

• 原著:退行性病与再生 • 上一篇    下一篇

PINK1和Parkin在灵长类大脑中的差异分布具有不同功能

  

  • 出版日期:2025-04-15 发布日期:2024-07-03

Differential distribution of PINK1 and Parkin in the primate brain implies distinct roles

Yanting Liu, Wei Huang, Jiayi Wen, Xin Xiong, Ting Xu, Qi Wang, Xiusheng Chen, Xianxian Zhao, Shihua Li, Xiaojiang Li, Weili Yang*   

  1. Guangdong Key Laboratory of Non-human Primate Research, Key Laboratory of CNS Regeneration (Ministry of Education), Guangdong-Hongkong-Macau CNS Regeneration Institute of Jinan University, Jinan University, Guangzhou, Guangdong Province, China
  • Online:2025-04-15 Published:2024-07-03
  • Contact: Weili Yang, PhD, weiliyang12@jnu.edu.cn.
  • Supported by:
    This work was supported by the National Natural Science Foundation of China, Nos. 32070534 (to WY), 32370567 (to WY), 82371874 (to XL), 81830032 (to XL), 82071421 (to SL); Key Field Research and Development Program of Guangdong Province, No. 2018B030337001 (to XL); Guangzhou Key Research Program on Brain Science, No. 202007030008 (to XL); Department of Science and Technology of Guangdong Province, Nos. 2021ZT09Y007, 2020B121201006 (to XL); Guangdong Basic and Applied Basic Research Foundation, Nos. 2022A1515012301 (to WY), 2023B1515020031 (to WY).

摘要:

PINK1Parkin基因突变均可引发青少年型帕金森病。大量体外研究表明,PINK1可磷酸化激活Parkin并共同参与线粒体自噬以保护神经细胞。然而,PINK1Parkin在生理状态下哺乳动物大脑中的表达模式仍不清楚,最主要的原因是既往小动物模型脑中检测不到PINK1蛋白表达且PINK1Parkin敲除的小鼠模型无法模拟帕金森病患者脑中神经退变的病理特征。作者课题组最近研究发现 PINK1 在灵长类动物大脑中以激酶形式(PINK1-55)选择性表达。实验首先开发了一种新的小鼠单克隆抗体(E7B6),用于检测猴脑和人脑组织中PINK1蛋白的表达。其次,利用出生后和成年阶段的猴脑组织进行检测,发现PINK1蛋白在出生后的不同发育阶段的猴脑中均可稳定表达。更为重要的是,实验利用新鲜的猴脑组织进行蔗糖密度梯度离心,分离了不同的亚细胞组分(线粒体、核糖体、ER、突触体、核、细胞质和髓鞘蛋白),发现PINK1蛋白在生理状态下主要富集在多种膜结合亚细胞器中,而Parkin蛋白则以可溶性形式存在于细胞浆,二者具有明显区别的表达和分布形式。最后,利用原代培养的猴星形胶质细胞进行检测,发现在生理状态下PINK1Parkin并无共定位,而当对线粒体进行药物应激时二者可共定位至线粒体。研究结果表明,PINK1/Parkin除了在线粒体损伤时参与线粒体自噬这种众所周知的传统功能之外,二者在生理状态下可能发挥各自独特的功能。

https://orcid.org/0000-0002-1187-4542 (Weili Yang)

Abstract: The vast majority of in vitro studies have demonstrated that PINK1 phosphorylates Parkin to work together in mitophagy to protect against neuronal degeneration. However, it remains largely unclear how PINK1 and Parkin are expressed in mammalian brains. This has been difficult to address because of the intrinsically low levels of PINK1 and undetectable levels of phosphorylated Parkin in small animals. Understanding this issue is critical for elucidating the in vivo roles of PINK1 and Parkin. Recently, we showed that the PINK1 kinase is selectively expressed as a truncated form (PINK1–55) in the primate brain. In the present study, we used multiple antibodies, including our recently developed monoclonal anti-PINK1, to validate the selective expression of PINK1 in the primate brain. We found that PINK1 was stably expressed in the monkey brain at postnatal and adulthood stages, which is consistent with the findings that depleting PINK1 can cause neuronal loss in developing and adult monkey brains. PINK1 was enriched in the membrane-bound fractionations, whereas Parkin was soluble with a distinguishable distribution. Immunofluorescent double staining experiments showed that PINK1 and Parkin did not colocalize under physiological conditions in cultured monkey astrocytes, though they did colocalize on mitochondria when the cells were exposed to mitochondrial stress. These findings suggest that PINK1 and Parkin may have distinct roles beyond their well-known function in mitophagy during mitochondrial damage.

Key words: neurodegeneration, Parkin, Parkinson’s disease, PINK1, subcellular distribution