新型中性粒细胞响应性发光纳米胶束的构建及其在小鼠烧伤模型成像中的应用  

Preparation of novel luminescent nanomicelles responsive to neutrophils and their imaging application in mouse burn model

作　　者：胡涛 郭嘉伟[2] 张建祥[3] HU Tao;GUO Jiawei;ZHANG Jianxiang(College of Bioengineering,Chongqing University,Chongqing,Army Medical University(Third Military Medical University),Chongqing,400038,China;Department of Pharmaceutical Analytical Chemistry,Army Medical University(Third Military Medical University),Chongqing,400038,China;Department of Pharmaceutics,Faculty of Pharmacy and Laboratory Medicine,Army Medical University(Third Military Medical University),Chongqing,400038,China)

机构地区：[1]重庆大学生物工程学院,重庆 [2]陆军军医大学(第三军医大学)药学与检验医学系药物分析学教研室,重庆 [3]陆军军医大学(第三军医大学)药学与检验医学系药剂学教研室,重庆

出　　处：《陆军军医大学学报》2025年第4期335-349,共15页Journal of Army Medical University

基　　金：重庆市研究生导师团队建设项目2022。

摘　　要：目的基于发光材料鲁米诺(Luminol)构建中性粒细胞响应性发光纳米胶束,并考察其在小鼠烧烫伤模型早期炎症中的成像能力。方法以六氯三聚磷腈(hexachlorotripolyphosphazene,HCCP)为骨架材料,化学键合鲁米诺(Luminol)和聚乙二醇(polyethylene Glycol,PEG)合成两亲性发光材料LHP,并采用红外光谱、核磁氢谱等方法对LHP的化学结构进行表征;将LHP溶于去离子水自组装形成纳米胶束LHP NM,同时测定其粒径大小和电位,并采用透射电镜(transmission electron microscope,TEM)观察纳米胶束的形态;使用光纤光谱仪、微弱发光测量仪和小动物活体成像仪对纳米胶束的光谱学性质、化学发光规律和体外发光成像能力进行详细评价。使用70、80和90℃热水按简单随机抽样法分组对雌性Balb/c小鼠进行烫伤处理以建立Ⅰ度至深Ⅱ度小鼠烧烫伤模型,各组样本数n=10,通过H&E染色结果判断模型小鼠皮肤烫伤深度,采用荧光定量qPCR测定烫伤皮肤组织TNF-α,IL-1β、IL-6和髓过氧化物酶(myeloperoxidase,MPO)的mRNA表达水平,ROS检测试剂盒考察烧伤小鼠皮肤组织活性氧(reactive oxygen species,ROS)水平随烫伤时间和深度变化的情况;采用FITC-Ly6G抗体标记中性粒细胞,观察模型小鼠皮肤组织中性粒细胞数量的变化;使用小动物活体成像系统考察纳米胶束LHP NM在小鼠烧烫伤模型中的成像能力,分析发光强度改变与中性粒细胞募集数量变化的相关性,对发光纳米胶束在小鼠烧烫伤模型早期炎症反应监测及烧烫伤深度能力诊断中的效果进行评价。结果核磁谱图解析证实一个HCCP分子上约键合了5个鲁米诺单元和一个聚乙二醇(PEG)链,TEM和粒径测定结果表明所制备纳米胶束形态呈空心球形,粒径约为120.000 nm。体外发光实验中,在不同浓度活性氧和MPO条件下,纳米胶束能实现高亮且持续的化学发光,发光强度与活性氧水平及纳米胶束浓度呈现良好的Objective To prepare neutrophil-responsive luminescent nanomicelles based on self-luminating compound,luminol,and investigate their imaging capability for a mouse burn model at early stage of inflammation.Methods Hexachlorotripolyphosphazene(HCCP)was utilized as the skeleton material to synthesize amphiphilic LHP luminescence materials through chemical synthesis of luminol and polyethylene glycol(PEG).The chemical structure of LHP was characterized using infrared spectrum and nuclear magnetic hydrogen spectrum.Nanomicelle LHP NM was formed by self-assembly of LHP in deionized water,and then its particle size and potential were measured.Transmission electron microscopy(TEM)was applied to observe the morphology of nanomicelles.Optical fiber spectrometer,weak luminescence measuring instrument,and small animal living imager were employed to evaluate the spectroscopic properties,chemiluminescence rules,and in vitro luminescence imaging ability of the nanomicelles.After that,female Balb/c mice were subjected to scalding with hot water at temperatures of 70℃,80℃,and 90℃,respectively to establish a mouse burn model ranging from degree I to degree II burns.The depth of skin scalds in the model mice was determined through HE staining,while the expression levels of TNF-α,IL-1β,IL-6 and myeloperoxidase(MPO)in the scalded skin tissues were assessed with fluorescence quantitative qPCR.The changes in reactive oxygen species(ROS)levels over time and burn depth in the skin tissues were determined with ROS detection kit.Additionally,the neutrophils within the skin tissues of model mice were labeled with FITC-Ly6G antibody to count the neutrophil number.Finally,a small animal imaging system was utilized to examine the imaging capability of nanomicelle LHP NM in a mouse burn model to analyze the correlation between luminous intensity and number of recruited neutrophil in order to evaluate the effectiveness of luminous nanomicelles for monitoring early inflammatory response and diagnosing burn depth in a mouse burn model.Resu

关 键 词：烫伤 纳米胶束 中性粒细胞 活性氧 

分 类 号：R363.2[医药卫生—病理学] R644[医药卫生—基础医学]