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碳纳米材料与血清蛋白和胆碱酯酶的相互作用

The interaction of carbon nanomaterials with serum proteins and cholinesterases
课程网址: http://videolectures.net/ipssc2017_sopotnik_carbon_nanomaterials/  
主讲教师: Maja Sopotnik
开课单位: 卢布尔雅那大学
开课时间: 2017-05-23
课程语种: 英语
中文简介:

近年来,纳米材料(NM)的生产一直在增长,并且NM在生物学和医学中的应用正在迅速发展。 NM的生物医学应用(作为组织生长的药物载体或平台)取决于NM与生物分子的相互作用。进入生物系统后,大多数材料会立即被一层蛋白质覆盖。这对于具有较大的表面体积比的NM尤其重要,因此可以相对于它们的体积结合许多蛋白质。蛋白质的这一层称为蛋白质“电晕”,代表生物体遇到NM而不是原始NM表面时实际看到的东西。组成电晕的蛋白质控制着机体NM的命运,因此,了解NM蛋白电晕的组成对于预测将NM用于生物医学目的的可能性非常重要。碳基NM属于最吸附剂。此外,已经表明碳基NM可以将生理上重要的酶如乙酰胆碱酯酶(AChE)和丁酰胆碱酯酶(BChE)吸附至其表面,改变其三级结构并抑制其酶活性。在我们的研究中,我们用牛血清白蛋白或人血清涂覆了具有不同形状和表面特性的碳基NM(无定形炭黑CB,氧化石墨烯GO和多壁碳纳米管MWCNT),并研究了它们对碳纳米管的结构和功能的影响。分离的电鳗AChE,分离的马血清BChE和固有的人血清BChE。使用改良的Ellman测定法测定了包被的NM对酶活性的影响。预涂有白蛋白的碳基纳米颗粒具有相当低的吸附能力,因此抑制了AChE和BChE的活性。 GO的作用并不明显,尽管它结合了最高数量和多样性的血清蛋白,但结合的血清白蛋白却少于其他两个研究的NMs。当与人血清混合时,GO与CB和MWCNT不同,它降低了内在BChE的活性,我们认为这也是其对血清白蛋白亲和力较弱的结果。对所研究NM的人血清蛋白电晕的成分分析表明,电晕富含载脂蛋白和补体因子。补体系统代表了针对异物(例如NM)的免疫和炎症反应的重要组成部分,并在过敏形成中起着重要作用。脂蛋白E,AI和B 100的结合促进了NM通过血脑屏障的转运。因此,被调查的NM的日冕中的载脂蛋白可能是有益的(例如,对于向大脑的靶向药物递送),或者是当环境中存在的NM向大脑的转移无法控制时,它可能是有害的。

课程简介: In recent years, nanomaterial (NM) production has been rising and NM application in biology and medicine has been developing quickly. Biomedical applications of NM (as drug carriers or platforms for tissue growth) are dependent on the interaction of NM with biomolecules. Upon entering a biological system, most materials are immediately coated by a layer of proteins. This is especially relevant for NM, which have a large surface-to-volume ratio and can therefore bind many proteins relative to their volume. This layer of proteins is called a protein “corona” and represents what the organism actually “sees” when encountering a NM, rather than the original NM surface. Proteins that compose the corona govern the destiny of the NM in the body, therefore knowing the composition of the NM protein corona is very important for predicting the possibility of the use of a NM in biomedical purposes. Carbon-based NM are among the most sorbent ones. Furthermore, it has been shown that carbon-based NM can adsorb physiologically important enzymes such as acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) to their surface, alter their tertiary structure and inhibit their enzymatic activity. In our study we have coated carbon-based NM of different shape and surface properties (amorphous carbon black - CB, graphene oxide - GO and multi-walled carbon nanotubes - MWCNT) with either bovine serum albumin or human serum and studied their influence on the structure and function of the isolated electric eel AChE, isolated horse serum BChE and intrinsic human serum BChE. The effect of the coated NM on the activity of enzymes was assayed using the modified Ellman assay. Carbon-based nanoparticles, pre-coated with albumin, had a considerably lower ability to adsorb and therefore to inhibit the activity of AChE and BChE. This effect was less prominent with GO, which, though it bound the highest amount and diversity of serum proteins, bound less serum albumin than the other two studied NMs. When mixed with human serum, GO, unlike CB and MWCNT, reduced the activity of the intrinsic BChE, which we assume is also the consequence of its weaker affinity towards serum albumin. The analysis of the composition of the human serum protein corona of the studied NM, showed that the corona is enriched in apolipoproteins and complement factors. The complement system represents an important part of the immune and inflammatory response towards foreign substances such as NM and can play an important role in the formation of allergies. The binding of lipoproteins E, A-I and B-100 facilitates the translocation of NM through the blood-brain barrier. Thus, the apolipoproteins in the corona of the investigated NM could be either beneficial – for example for targeted drug delivery to the brain – or harmful, when the translocation of the environment-present NM to the brain would be uncontrolled.
关 键 词: 纳米材料; 蛋白质“电晕”; 碳基NM; 酶活性
课程来源: 视频讲座网
数据采集: 2020-11-23:cjy
最后编审: 2020-11-23:cjy
阅读次数: 68