Early alterations of functional connectivity, regional brain volumes and astrocyte markers in the beta-sitosterol beta-d-glucoside (BSSG) rat model of parkinsonism

IF 4.6 2区 医学 Q1 NEUROSCIENCES
C. Monnot , M. Kalomoiri , E. MacNicol , E. Kim , M. Mesquita , P. Damberg , J.M. Van Kampen , D.G. Kay , F. Turkheimer , H.A. Robertson , D. Cash , P. Svenningsson
{"title":"Early alterations of functional connectivity, regional brain volumes and astrocyte markers in the beta-sitosterol beta-d-glucoside (BSSG) rat model of parkinsonism","authors":"C. Monnot ,&nbsp;M. Kalomoiri ,&nbsp;E. MacNicol ,&nbsp;E. Kim ,&nbsp;M. Mesquita ,&nbsp;P. Damberg ,&nbsp;J.M. Van Kampen ,&nbsp;D.G. Kay ,&nbsp;F. Turkheimer ,&nbsp;H.A. Robertson ,&nbsp;D. Cash ,&nbsp;P. Svenningsson","doi":"10.1016/j.expneurol.2024.115118","DOIUrl":null,"url":null,"abstract":"<div><div>The β-sitosterol-β-ᴅ-glucoside (BSSG) rat model of experimental parkinsonism develops pathological behaviour and motor changes that progress over time. The purpose of this study was to identify early changes in structure and function of the brain of rats treated with BSSG using both structural and resting-state functional MRI. BSSG and non-BSSG rats were fed five days a week for sixteen weeks, then underwent <em>in vivo</em> MRI scans and an assessment of motor performance 2 and 8 weeks later (18 and week 24 from BSSG). Groups of rats were killed at weeks 19 and 25, then imaged again with MR <em>ex vivo,</em> and immunostained for tyrosine hydroxylase (TH). Since BSSG may interfere with cholesterol metabolism in astrocytes, we also studied potential target engagement and measured levels of astrocyte markers GFAP and S100b. At both studied timepoints, functional connectivity (FC) between brain areas with intermediate connectivity was decreased, but brain volumes increased in the BSSG-treated rats. At week 18/19, fine movements were normal, whereas TH and GFAP were decreased in the striatum, but not in the substantia nigra. At week 24/25, fine movements were impaired, and TH was decreased both in the striatum and the substantia nigra and S100b was increased in the substantia nigra. Astrogliosis may contribute to the increased brain volume found after BSSG exposure. Using the BSSG model of parkinsonism, the results demonstrate <em>early</em> functional and structural alterations in MRI imaging that occur <em>before</em> the appearance of detectable motor symptoms.</div></div>","PeriodicalId":12246,"journal":{"name":"Experimental Neurology","volume":"385 ","pages":"Article 115118"},"PeriodicalIF":4.6000,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Experimental Neurology","FirstCategoryId":"3","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0014488624004448","RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"NEUROSCIENCES","Score":null,"Total":0}
引用次数: 0

Abstract

The β-sitosterol-β-ᴅ-glucoside (BSSG) rat model of experimental parkinsonism develops pathological behaviour and motor changes that progress over time. The purpose of this study was to identify early changes in structure and function of the brain of rats treated with BSSG using both structural and resting-state functional MRI. BSSG and non-BSSG rats were fed five days a week for sixteen weeks, then underwent in vivo MRI scans and an assessment of motor performance 2 and 8 weeks later (18 and week 24 from BSSG). Groups of rats were killed at weeks 19 and 25, then imaged again with MR ex vivo, and immunostained for tyrosine hydroxylase (TH). Since BSSG may interfere with cholesterol metabolism in astrocytes, we also studied potential target engagement and measured levels of astrocyte markers GFAP and S100b. At both studied timepoints, functional connectivity (FC) between brain areas with intermediate connectivity was decreased, but brain volumes increased in the BSSG-treated rats. At week 18/19, fine movements were normal, whereas TH and GFAP were decreased in the striatum, but not in the substantia nigra. At week 24/25, fine movements were impaired, and TH was decreased both in the striatum and the substantia nigra and S100b was increased in the substantia nigra. Astrogliosis may contribute to the increased brain volume found after BSSG exposure. Using the BSSG model of parkinsonism, the results demonstrate early functional and structural alterations in MRI imaging that occur before the appearance of detectable motor symptoms.
β-谷甾醇-β-d-葡萄糖苷(BSSG)帕金森病大鼠模型中功能连接、区域脑容量和星形胶质细胞标记物的早期改变。
β-谷甾醇-β-酰-糖苷(BSSG)实验性帕金森大鼠模型随着时间的推移出现病理行为和运动改变。本研究的目的是通过结构和静息状态功能MRI来确定BSSG治疗大鼠脑结构和功能的早期变化。BSSG和非BSSG大鼠每周喂食5天,持续16周,然后在2周和8周(BSSG第18周和24周)后进行体内MRI扫描和运动表现评估。各组大鼠于第19周和第25周处死,然后再次进行体外磁共振成像,并进行酪氨酸羟化酶(TH)免疫染色。由于BSSG可能干扰星形胶质细胞中的胆固醇代谢,我们还研究了潜在的靶标结合,并测量了星形胶质细胞标志物GFAP和S100b的水平。在这两个研究时间点上,bssg治疗的大鼠具有中间连通性的脑区之间的功能连通性(FC)下降,但脑容量增加。在第18/19周,精细运动正常,而纹状体中TH和GFAP下降,而黑质中没有。第24/25周精细运动受损,纹状体和黑质TH均下降,黑质S100b升高。星形胶质细胞增生可能有助于BSSG暴露后发现的脑容量增加。使用帕金森病的BSSG模型,结果表明在可检测的运动症状出现之前,MRI成像就出现了早期功能和结构改变。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Experimental Neurology
Experimental Neurology 医学-神经科学
CiteScore
10.10
自引率
3.80%
发文量
258
审稿时长
42 days
期刊介绍: Experimental Neurology, a Journal of Neuroscience Research, publishes original research in neuroscience with a particular emphasis on novel findings in neural development, regeneration, plasticity and transplantation. The journal has focused on research concerning basic mechanisms underlying neurological disorders.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信