X射线照射Hep-2细胞的最佳剂量红外光谱研究

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"这篇文章是关于使用傅立叶变换红外光谱法(FTIR)研究不同剂量X射线照射对人表皮喉癌细胞系(Hep-2)的影响的研究。研究发现,X射线照射破坏了DNA中胸腺嘧啶的CH3基团结构,有效地抑制了Hep-2细胞的繁殖;8 Gy剂量的X射线照射对细胞内蛋白质、脂质和核酸分子的结构和相对含量影响最大。" 这篇研究中,研究人员利用傅立叶变换红外光谱技术(FTIR)对经过不同剂量X射线照射的人类表皮喉癌细胞Hep-2进行了深入分析。FTIR是一种非破坏性的分子鉴定技术,能够提供有关分子化学键信息的详细光谱,因此在生物医学领域广泛用于检测细胞和组织的化学变化。 首先,研究结果显示,X射线辐射导致了DNA中胸腺嘧啶(Thymine)的CH3基团结构受损。胸腺嘧啶是DNA四种碱基之一,参与形成DNA的双螺旋结构。这种损伤直接影响了DNA的正常复制和细胞的生命周期,从而抑制了Hep-2细胞的增殖能力。这是细胞放射生物学中一个关键的发现,因为理解辐射如何影响DNA有助于优化癌症治疗策略。 其次,当剂量达到8 Gy时,X射线对细胞内蛋白质、脂质和核酸分子的框架及相对含量产生了最大程度的变化。这可能涉及到蛋白质的变性、脂质膜的破坏以及DNA或RNA的损伤,这些变化都会影响细胞的基本功能,包括代谢、信号转导和基因表达。这些变化可能导致细胞凋亡或永久性生长停滞,对于放射治疗的效果评估具有重要意义。 最后,研究并未详细说明超过8 Gy剂量的X射线照射会带来何种影响,但通常情况下,更高的辐射剂量会进一步增加细胞损伤,可能导致更显著的细胞死亡。然而,过高的剂量也可能引起正常组织的不可逆损伤,因此在临床实践中,寻找最佳的放射剂量平衡至关重要。 这项研究提供了关于X射线对Hep-2细胞具体分子水平影响的见解,对于理解辐射治疗机制以及优化癌症治疗方案具有理论和实践价值。同时,该研究还强调了FTIR作为生物样品分析工具的有效性和潜力。

润色下面英文:The controlled drug delivery systems, due to their precise control of drug release in spatiotemporal level triggered by specific stimulating factors and advantages such as higher utilization ratio of drug, less side-effects to normal tissues and so forth, provide a new strategy for the precise treatment of many serious diseases, especially tumors. The materials that constitute the controlled drug delivery systems are called “smart materials” and they can respond to the stimuli of some internal (pH, redox, enzymes, etc.) or external (temperature, electrical/magnetic, ultrasonic and optical, etc.) environments. Before and after the response to the specific stimulus, the composition or conformational of smart materials will be changed, damaging the original balance of the delivery systems and releasing the drug from the delivery systems. Amongst them, the photo-controlled drug delivery systems, which display drug release controlled by light, demonstrated extensive potential applications, and received wide attention from researchers. In recent years, photo-controlled drug delivery systems based on different photo-responsive groups have been designed and developed for precise photo-controlled release of drugs. Herein, in this review, we introduced four photo-responsive groups including photocleavage groups, photoisomerization groups, photo-induced rearrangement groups and photocrosslinking groups, and their different photo-responsive mechanisms. Firstly, the photocleavage groups represented by O-nitrobenzyl are able to absorb the energy of the photons, inducing the cleavage of some specific covalent bonds. Secondly, azobenzenes, as a kind of photoisomerization groups, are able to convert reversibly between the apolar trans form and the polar cis form upon different light irradiation. Thirdly, 2-diazo-1,2-naphthoquinone as the representative of the photo-induced rearrangement groups will absorb specific photon energy, carrying out Wolff rearrangement reaction. Finally, coumarin is a promising category photocrosslinking groups that can undergo [2+2] cycloaddition reactions under light irradiation. The research progress of photo-controlled drug delivery systems based on different photo-responsive mechanisms were mainly reviewed. Additionally, the existing problems and the future research perspectives of photo-controlled drug delivery systems were proposed.

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