畜牧兽医学报 ›› 2024, Vol. 55 ›› Issue (7): 3213-3224.doi: 10.11843/j.issn.0366-6964.2024.07.039

• 临床兽医 • 上一篇    下一篇

硒代蛋氨酸通过PINK1/Parkin介导的线粒体自噬缓解氟诱导的抑郁样行为

李媛媛(), 王天玉(), 李梦, 张文慧, 王英卉, 赵天瑞, 李浩洁, 赵阳飞, 王金明*()   

  1. 山西农业大学动物医学学院, 太谷 030801
  • 收稿日期:2023-11-03 出版日期:2024-07-23 发布日期:2024-07-24
  • 通讯作者: 王金明 E-mail:16635049401@163.com;2984232749@qq.com;jm50408@163.com
  • 作者简介:李媛媛(1999-),女,山西晋城人,硕士,主要从事环境毒理学研究,E-mail:16635049401@163.com
    王天玉(1995-),女,山西长治人,博士,主要从事环境毒理学研究,E-mail:2984232749@qq.com
    第一联系人:

    李媛媛和王天玉为同等贡献作者

  • 基金资助:
    国家自然科学基金项目(31972751);现代农业产业体系项目(2024CYJSTX13-10);山西农业大学横向科技项目(2022HX286);山西农业大学横向科技项目(2024HX001)

Selenomethionine, through PINK1/Parkin-mediated Mitochondrial Autophagy, Alleviates Fluoride-induced Depressive-like Behavior

Yuanyuan LI(), Tianyu WANG(), Meng LI, Wenhui ZHANG, Yinghui WANG, Tianrui ZHAO, Haojie LI, Yangfei ZHAO, Jinming WANG*()   

  1. College of Veterinary Medicine, Shanxi Agricultural University, Taigu 030801, China
  • Received:2023-11-03 Online:2024-07-23 Published:2024-07-24
  • Contact: Jinming WANG E-mail:16635049401@163.com;2984232749@qq.com;jm50408@163.com

摘要:

本文旨在探究PINK1/Parkin介导的线粒体自噬在硒代蛋氨酸(selenomethionine, Se-Met)缓解氟致抑郁样行为中的作用。选取40只BALB/c小鼠随机分为5组:空白对照组(C组)、氟组(NaF 150 mg·L-1,F组)、氟+低硒组(NaF 150 mg·L-1+1.5 mg·L-1,F+LSe组)、氟+中硒组(NaF 150 mg·L-1+3.0 mg·L-1,F+MSe组)、氟+高硒组(NaF 150 mg·L-1+6.0 mg·L-1,F+HSe组)。氟化钠暴露90 d后,通过高架O型迷宫和悬尾试验观察小鼠的行为学表现,运用HE染色观察小鼠大脑皮质的损伤情况,采用生化试剂盒检测氧化应激相关指标的含量,并使用实时荧光定量PCR方法检测线粒体自噬相关基因的表达水平。动物行为学结果显示:与C组相比,F组小鼠在悬尾试验中的“静止”时间显著增加(P<0.05),在高架O型迷宫中进入闭合臂的时间有明显升高趋势(P<0.05)。在补充Se-Met后小鼠“静止”时间显著减少(P<0.05),F+LSe和F+MSe小鼠进入闭合臂的时间相比于F组显著减少(P<0.05)。病理组织切片结果显示:F组小鼠大脑皮质细胞排列紊乱,细胞体积缩小,且椎体细胞数量减少。经Se-Met改善后,F+LSe组的大脑皮质组织核仁清晰,细胞质更加均匀,改善效果更显著。氧化应激相关指标结果显示:与C组相比,F组活性氧(reactive oxygen species, ROS)显著升高(P<0.05),谷胱甘肽过氧化物酶(glutathione peroxidase, GSH-PX)含量显著减少(P<0.05)。与F组相比,F+LSe、F+HSe和F+MSe组ROS含量均显著降低(P<0.05),且含量依次表现为F+LSe<F+HSee<F+MSe;F+LSe和F+HSe组GSH-PX含量相比于F组显著升高(P<0.05)。自噬相关基因的mRNA表达水平结果显示:与C组相比,F组自噬相关基因ParkinPINK1、LC3、OPTNNBR1、Drp1、Fis1的mRNA表达水平显著升高(P<0.05),OPA1、Mfn1、Mfn2的mRNA表达水平显著降低(P<0.05)。与F组相比,F+LSe和F+HSe组显著降低ParkinOPTNPINK1、P62、NBR1和Fis1的mRNA表达水平(P<0.05),F+LSe和F+MSe组显著降低ParkinLC3、Drp1和P62的mRNA表达水平(P<0.05),显著增加OPA1的mRNA表达水平(P<0.05),F+LSe组显著增加Mfn2的mRNA表达水平(P<0.05)。综上所述,1.5 mg·L-1 Se-Met可通过影响线粒体自噬相关基因的表达,恢复线粒体融合与分裂的动态平衡状态,缓解大脑皮质氧化应激,从而改善大脑皮质组织损伤和抑郁样行为的出现。

关键词: 硒代蛋氨酸, 氟, 线粒体自噬, 大脑皮质

Abstract:

This experiment aims to investigate the role of PINK1/Parkin-mediated mitochondrial autophagy in the alleviation of fluoride-induced depressive-like behavior by selenomethionine (Se-Met). Forty BALB/c mice were selected and randomly divided into five groups: the blank control group (Group C), the fluorine group (NaF 150 mg·L-1, Group F), the fluorine+low selenium group (NaF 150 mg·L-1+1.5 mg·L-1, Group F+LSe), the fluorine+medium selenium group (NaF 150 mg·L-1+3.0 mg·L-1, Group F+MSe), the fluorine+high selenium group (NaF 150 mg·L-1+6.0 mg·L-1, Group F+HSe). After 90 d of sodium fluoride exposure, the behavioral performance of mice was assessed by means of an elevated O-maze and hanging tail experiments; HE staining was used to evaluate the damage of the mouse cortex; biochemical kits were used to measure the content of oxidative stress-related indices; and real-time fluorescence quantitative PCR was utilized to determine the expression levels of mitochondrial autophagy-related genes. Animal behavioral results showed: the results indicated that mice in group F had a significantly longer "resting" time in the tail suspension test compared to group C (P<0.05) and a tendency to take more time to enter the closed arm of the elevated O-maze (P<0.05). After Se-Met supplementation, the "resting" time of mice was reduced significantly (P<0.05), and the F+LSe and F+MSe mice took significantly less time to enter the closed arm (P<0.05), compared to the F group. The results of the histopathological sections showed: the mice in group F had disorganized cortical cells, reduced cell volume, and fewer vertebral cells. Following Se-Met enhancement, the F+LSe group showed distinct nuclei and more uniform cytoplasm, and the improvement was notably more pronounced. The results of oxidative stress related indicators showed: group F had a significantly higher level of reactive oxygen species (ROS) (P<0.05), and a significantly reduced content of glutathione peroxidase (GSH-PX) (P<0.05), when compared to group C. Groups F+LSe, F+HSe, and F+MSe showed significantly lower levels of ROS (P<0.05). Compared to group F, the ROS content was considerably lower (P<0.05), in groups F+LSe, F+HSe, and F+MSe, with the content decreasing in the order of F+LSe<F+HSe<F+MSe; the GSH-PX content, on the other hand, was significantly higher (P<0.05), in groups F+LSe and F+HSe, compared to group F. Results of mRNA expression levels of autophagy-related genes were shown: group F showed significantly higher mRNA expression levels of autophagy-related genes Parkin, PINK1, LC3, OPTN, NBR1, Drp1, and Fis1 (P<0.05), compared to group C, and significantly lower mRNA expression levels of OPA1, Mfn1, and Mfn2 (P<0.05). Compared to group F, the mRNA expression levels of Parkin, PINK1, P62, NBR1, OPTN, and Fis1 were significantly lower in the F+LSe and F+HSe groups (P<0.05), LC3, Parkin, P62 and Drp1 were significantly decreased in the F+LSe and F+MSe groups (P<0.05), OPA1 was significantly increased (P<0.05), and the F+LSe group showed a significant increase in the mRNA expression level of Mfn2 (P<0.05). In summary, 1.5 mg·L-1 of Se-Met can alleviate cortical oxidative stress by affecting the expression of mitochondrial autophagy-related genes, restoring the dynamic equilibrium state of mitochondrial fusion and fission, and thus ameliorating cerebral cortex damage and the emergence of depressive-like behaviors.

Key words: selenomethionine, fluoride, mitochondrial autophagy, cerebral cortex

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