小中大
相关疾病:
脑炎感染
篇名: Positioning of follicular dendritic cells within the spleen controls prion neuroinvasion
刊名: Nature
ISSN: 0028-0836
卷期: 425 卷 6961 期 出版日期: 20031030
页码: 从 957 页到 962 页共 6 页
Peripheral infection is the natural route of transmission in most prion diseases. Peripheral prion infection is followed by rapid prion replication in lymphoid organs, neuroinvasion and progressive neurological disease. Both immune cells and nerves are involved in pathogenesis, but the mechanisms of prion transfer from the immune to the nervous system are unknown. Here we show that ablation of the chemokine receptor CXCR5 juxtaposes follicular dendritic cells (FDCs) to major splenic nerves, and accelerates the transfer of intraperitoneally administered prions into the spinal cord. Neuroinvasion velocity correlated exclusively with the relative locations of FDCs and nerves: transfer of CXCR5-/- bone marrow to wild-type mice induced perineural FDCs and enhanced neuroinvasion, whereas reciprocal transfer to CXCR5-/- mice abolished them and restored normal efficiency of neuroinvasion. Suppression of lymphotoxin signalling depleted FDCs, abolished splenic infectivity, and suppressed acceleration of pathogenesis in CXCR5-/- mice. This suggests that prion neuroimmune transition occurs between FDCs and sympathetic nerves, and relative positioning of FDCs and nerves controls the efficiency of peripheral prion infection.
Prion对小鼠生物钟的改变?这不是很新的研究结果但是值得看看!
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传染性泡状脑炎(TSEs-transmissible spongiform encephalopathies)的临床诊断一直是一个很困难的问题,因为往往要到疾病发展到晚期的时候病人才能表现出临床症状来。Dell'Omo et al.在European Journal of Neuroscience上报道的最新研究发现被不同prion种系所感染的小鼠在临床症状产生之前就表现出生物钟活性的显著改变,而且这些改变是与prion的种系有关的。
研究者将小鼠用三种prion种系进行感染,分别是139A、ME7和牛的泡状脑炎BSE种系301C。用一个自动的跟踪系统,小鼠的活动被连续的监控了七个星期。最显著的活动改变出现的夜间,小鼠最活跃的时期。注射了301C和ME7的小鼠表现出夜间活性的持续抑制,从开始监控时就产生。而139A种系注射小鼠则一开始表现出正常的活性,但在临床症状开始产生后表现出异常的活跃。在11周后,301C注射小鼠表现出比ME7注射小鼠活动少的多。
研究者认为这种监控的系统同样适用与大型动物,这显然是早期诊断的一个重要指标,而且如果活性改变还与病毒种系有关的话,检测出受感染动物是受何种病毒感染也是十分可能的了。
相关文章及链接:
ORIGINAL RESEARCH PAPERS
Dell'Omo, G. et al. Automated home cage monitoring of mice infected with BSE and scrapie differentiates early behavioural changes according to prion strain. Eur. J. Neurosci. 2002 (doi:10.1046/j.1460-9568.2002.02128.x)
FURTHER READING
Collinge, J. Prion diseases of humans and animals: their causes and molecular basis. Annu. Rev. Neurosci. 24, 519-550 (2001) | Article | PubMed |
WEB SITES
Encyclopedia of Life Sciences: prion diseases