急性脊髓损伤模型大鼠蛋白质组学研究：iTRAQ技术的验证

The study of proteomics in acute spinal cord injury rats by iTRAQ technology

背景:同位素标记相对和绝对定量(Isobaric tags for relative and absolute quantitation,i TRAQ)质谱分析技术依据串联质谱中信号离子表达质荷比峰值的不同来研究相关对应蛋白质的信息。目的:建立急性脊髓损大鼠模型,观察其脑脊液差异蛋白谱,从微观分子水平研究急性脊髓损伤后继发性损伤的机制及有效治疗方法。方法:建立SD大鼠急性脊髓损伤模型,取脑脊液应用i TRAQ技术鉴定SD大鼠急性脊髓损伤后脑脊液的差异蛋白质。结果与结论:共鉴定蛋白数722个,差异表达蛋白107个:下调的差异蛋白有63个,上调的差异蛋白数是44个。其中相关神经再生的差异蛋白19个:上调14个,下调5个;调节神经再生的差异蛋白7个。实验中检测到的多种差异蛋白及表达明显的神经再生因子可能作为急性脊髓损伤的生物标记物或可能作为临床管理监测急性脊髓损伤的损伤进程、靶向治疗及评估疗效的强有力证据。

BACKGROUND：Isobaric tags for relative and absolute quantitation （iTRAQ） mass spectrometry technology studys the information of relevant protein according to the ion signal shows different mass-to-charge ratio in the tandem mass spectrometry analysis. OBJECTIVE：To establish the protein spectrum of differential proteins in cerebrospinal fluid of acute spinal cord injury rat model, study the secondary injury mechanism and find an effective method of treating acute spinal cord injury from molecular level. METHODS：Acute spinal cord injury was produced in Sprague-Dawley rats and iTRAQ technology was applied to analyze the differential proteins in cerebrospinal fluid of acute spinal cord injury rat model. RESULTS AND CONCLUSION：Total 722 proteins have been identified in this study, including 107 differentialy expressed proteins, 63 downregulated proteins and 44 upregulated proteins. There were 19 proteins related to neurogenesis, including 14 up-regulation proteins and 5 down-regulation proteins. Seven proteins contributed to the regulation of neurogenesis. The differential proteins and growth factor identified in this study can be taken as the biomarkers of acute spinal cord injury or indicators of clinical monitoring of the progression, target treatment＆amp;nbsp;and efficacy assessment after acute spinal cord injury.