目的定量分析SD大鼠非动脉炎性前部缺血性视神经病变(NAION)模型中视神经组织蛋白表达变化，并对差异蛋白进行生物信息学分析。
方法选取10只8周龄体质量200~250 g的SPF级雄性SD大鼠，采用孟加拉玫瑰红联合激光光动力方法建立NAION模型，最终选取4只造模成功的大鼠作为NAION模型组，同时取4只体质量和周龄相匹配的健康、无眼疾SD大鼠作为正常对照组。于造模后7 d，分离各组大鼠球后视神经，采用酶切法进行样本制备，采用同位素标记相对和绝对定量标记结合液相色谱-串联质谱技术对组织蛋白进行质谱鉴定和定量检测，选取组间表达倍数大于1.5倍且差异有统计学意义( P<0.05)的蛋白为差异蛋白，并对差异蛋白进行生物信息学分析。
结果造模后3 d，NAION模型组大鼠视盘隆起，荧光素眼底血管造影图像显示视盘区有荧光素钠渗漏，模型建立成功。共鉴定出1 291个可定量蛋白，其中差异蛋白80个。与正常对照组比较，NAION模型组中表达上调的蛋白5个，表达下调的蛋白75个。V型胶原α1链(Col5A1)和cAMP依赖性蛋白激酶催化亚基β(Prkacb)、G蛋白相关支架蛋白(Dlg1)等蛋白表达升高；神经微丝蛋白(Nefm)、微管相关蛋白1b(Map1b)、Ras相关蛋白(Rala)、丝氨酸/苏氨酸蛋白激酶N2(Pkn2)、血小板活化因子乙酰水解酶IB亚基(Pafah1b1)等蛋白表达降低。差异蛋白主要参与细胞骨架的调节、细胞对缺氧的反应、轴突生成及延伸、突触调节、神经元凋亡调控、轴浆运输等生物学进程。京都基因与基因组通路富集分析结果显示，差异蛋白主要参与代谢通路、突触囊泡循环、血小板活化等信号通路。
结论神经生长、能量代谢、轴浆运输及凋亡等信号通路相关蛋白的表达共同参与NAION中神经细胞的凋亡。
ObjectiveTo quantitatively analyze the protein expression changes of the optic nerve in an SD rat model of non-arteritic anterior ischemic optic neuropathy (NAION), and to make bioinformatics analysis of the differential proteins.
MethodsTen 8-week-old SPF male SD rats with a body mass of 200-250 g were selected.The NAION model was established using the method of rose bengal and laser photodynamics.Four from the 8 rats with successful model were selected as the NAION model group.Another 4 body weight- and age-matched healthy SD rats without eye diseases were taken as the normal control group.The optic nerve was dissected on the 7th day after modeling.The samples were prepared by the enzyme digestion method, and the proteins were identified and quantitatively detected by isobaric tag for relative and absolute quantification labeling combined with liquid chromatography-tandem mass spectrometry.The proteins with expression fold greater than 1.5 times and significant differences between the two groups ( P<0.05) were defined as differentially expressed proteins and analyzed by bioinformatics.The use and care of animals complied with Regulations for the Administration of Affair Concerning Experimental Animals by the State Science and Technology Commission of China.The study protocol was approved by an Animal Ethical and Welfare Committee of Tianjin Medical University Eye Hospital (No.TJYY2021041029).
ResultsThree days after modeling, the optic disc of rats was swollen and fluorescein leakage in the optic disc was detected in fluorescein fundus angiography images in the NAION model group, which indicated the model was established successfully.A total of 1 291 quantifiable proteins including 80 differentially expressed proteins were identified.Compared with the normal control group, there were 5 up-regulated proteins and 75 down-regulated proteins.The expression levels of collagen alpha-1(V) chain (Col5A1), cAMP-dependent protein kinase catalytic subunit beta (Prkacb) and disks large homolog 1(Dlg1) were increased, and the expression levels of neurofilament medium polypeptide (Nefm), microtubule-associated protein 1B (Map1b), Ras-related protein Ral-A (Rala), serine/threonine-protein kinase N2 (Pkn2) and platelet-activating factor acetylhydrolase IB subunit beta (Pafah1b1) were decreased.Differentially expressed proteins were mainly involved in the biological processes, including regulation of the cytoskeleton, cellular response to hypoxia, axon production and extension, regulation of synapse, regulation of neuron apoptosis and axo-dendritic transport, etc.KEGG pathway enrichment analysis showed that differentially expressed proteins were mainly involved in metabolic pathways, synaptic vesicle circulation and platelet activation.
ConclusionsThe expression of proteins related to signal pathways such as nerve growth, energy metabolism, axo-dendritic transport and apoptosis is involved in the apoptosis of neurons in NAION.
胡立影,李志清,邵先锋,等. 大鼠非动脉炎性前部缺血性视神经病变模型视神经蛋白质组学分析[J]. 中华实验眼科杂志,2022,40(01)：13-20.
DOI:10.3760/cma.j.cn115989-20201104-00745版权归中华医学会所有。
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