Nano Lett:铁蛋白纳米酶清除活性氧治疗实验性恶性脑疟研究获进展

2019-11-07 不详大屯路15号 中国生物技术网

Nano Letters 杂志在线发表了铁蛋白纳米酶通过靶向脑内皮细胞和调控纳米酶发挥清除活性氧功能,实现治疗恶性脑型疟疾的最新研究成果。研究人员首次利用铁蛋白对脑内皮细胞靶向和胞内亚定位特性,实现了对铁基纳米酶在脑部发挥过氧化氢酶活性的调控。结合铁蛋白对肝部巨噬细胞的极化调控特性,实现了对恶性脑型疟疾模型的有效治疗。这是中国科学院生物物理研究所阎锡蕴团队继发现铁蛋白和纳米酶的新特性,并将其用于肿

Nano Letters 杂志在线发表了铁蛋白纳米酶通过靶向脑内皮细胞和调控纳米酶发挥清除活性氧功能,实现治疗恶性脑型疟疾的最新研究成果。研究人员首次利用铁蛋白对脑内皮细胞靶向和胞内亚定位特性,实现了对铁基纳米酶在脑部发挥过氧化氢酶活性的调控。结合铁蛋白对肝部巨噬细胞的极化调控特性,实现了对恶性脑型疟疾模型的有效治疗。这是中国科学院生物物理研究所阎锡蕴团队继发现铁蛋白和纳米酶的新特性,并将其用于肿瘤催化诊疗之后,取得的又一新进展。

疟疾是一种由原生动物疟原虫引起的蚊媒传染病,全世界每年有2亿多病例,40多万人死亡。在感染人类的5种疟原虫中,恶性疟原虫常常引起严重的症状,包括危及生命的神经并发症——脑型疟疾。尽管在开发抗疟疾药物和以青蒿素为基础的联合疗法方面取得了重大进展,但脑型疟疾的死亡率仍然高达30%,尤其是儿童。此外,10-24%的脑型疟疾患者存在神经后遗症,因此需要寻找更有效和更具体的治疗方法。

利用恶性脑疟发病的特征,是设计治疗恶性脑疟新方法的关键。有研究表明,被寄生虫感染的红细胞破裂后释放的游离血红素产生过量的活性氧,会损害脑内皮细胞,进而造成血脑屏障破坏。因此,活性氧可能是脑型疟疾发生过程中损害血脑屏障的重要中介物质。研究人员针对脑内皮细胞中活性氧上升的特点,结合铁蛋白对脑内皮细胞靶向和胞内亚定位的特性,及铁基纳米酶在中性条件下的过氧化氢酶催化活性的特点,设计合成了铁蛋白纳米酶(Fenozyme)。在实验性恶性脑疟小鼠体内,铁蛋白纳米酶通过调控纳米酶发挥过氧化氢酶活性,保护血脑屏障内皮细胞免受活性氧损伤,显着提高了存活率。同时铁蛋白纳米酶和抗疟疾主流药物青蒿素衍生物(蒿甲醚)联合给药可以显着性减轻恶性脑疟存活小鼠的脑部炎症和记忆障碍。这些结果表明活性氧在脑型疟疾发生发展中的重要性,并提示铁蛋白纳米酶联合抗疟药是一种新的恶性脑疟治疗的有效策略。此外,铁蛋白使肝脏中的巨噬细胞极化为M1表型,促进血液中疟原虫的清除,突出了铁蛋白纳米酶作为脑型疟疾辅助治疗的潜力。

该研究由生物物理所、中科院纳米酶工程实验室阎锡蕴/范克龙课题组完成。其中,阎锡蕴和范克龙为论文通讯作者,生物物理所博士研究生赵帅为论文第一作者。副研究员段红霞和苏州系统医学研究所研究员杨义力为该研究提供了帮助。该研究获得中科院先导项目、国家自然科学基金项目以及中科院青年创新促进会项目等的资助。

原始出处:
Zhao S1,2, Duan H1, Yang Y3, et al.Fenozyme Protects the Integrity of the Blood-Brain Barrier against Experimental Cerebral Malaria.Nano Lett. 2019 Nov 6. doi: 10.1021/acs.nanolett.9b03774. [Epub ahead of print]

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    2020-09-16 lujian
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    2019-11-09 徐岩
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一次值班,一男患者拿着化验单前来咨询。“医生,您帮我看看这个结果,我前天在其他医院查的铁蛋白为336.76ng/ml,今天怎么就只有90.48 ng/ml? ”我拿过化验单,两份报告都是采用化学发光法,参考范围相同,也许仪器不同,但是这结果也相差有点大了?

Blood:红细胞铁蛋白缺乏会导致血清铁不足,并促进氧化应激导致的溶血

中心点:红细胞上的FPN对血液的铁含量至关重要。FPN缺陷易导致红细胞氧化损伤。摘要:铁蛋白(FPN),是目前唯一已知的脊柱动物的铁出口,将铁从肠道、脾和肝血细胞转运至血液,为机体的其他组织和细胞提供铁。大部分循环铁被红细胞用来合成血红蛋白。De-Liang Zhang等人发现红细胞不仅会消耗大部分的铁,还可向血液返回大量的铁。特异性敲除有核红细胞Fpn的小鼠(Fpn KO)表现为血清铁水平低、组

Blood:铁蛋白是通过两条独特的非经典囊泡途径分泌。

铁蛋白的转运在组织铁代谢过程中发挥主要作用,铁蛋白功能异常与铁平衡紊乱和神经退行性疾病相关。在大部分真核生物中,铁蛋白位于胞内,以非毒性、非活性形式储存铁。对于昆虫,铁蛋白为分泌蛋白,在铁的系统分布调节中发挥主要作用。哺乳动物缺乏调控经典高尔基分泌铁蛋白的信号肽,但在血清中发现,铁蛋白是通过非经典的溶酶体分泌途径分泌。

Biochim Biophys Acta:母乳也成抗癌利器?新研究开启乳铁蛋白“杀手”模式

在一项由奥地利科学基金(FWF)资助的项目中,奥地利格拉茨大学的科学家们对母乳中的某种宿主防御肽进行了改造,使其能够特异性识别并攻击癌细胞。这种存在于多种哺乳动物母乳中的活性大分子可以诱导细胞凋亡,具有潜在的癌症治疗价值。

Cell:铁蛋白维持机体血糖促进对于败血症的耐受性

这项研究,为研究机体如何调节代谢来适应和忍受败血症的后果提供了新的理论基础。并且揭示了铁蛋白对于败血症的保护作用,补充铁蛋白很有可能成为未来治疗败血症的潜力手段。