肠易激综合征脑-肠交互作用模型结肠组织蛋白指纹图谱初探

目的 建立肠易激综合征(IBS)动物模型,利用基质辅助激光解析电离飞行时间质谱(MALDI-TOF-MS)技术分析结肠组织差异蛋白质表达谱,为探索IBS发病机制提供线索.方法 雄性成年Wistar大鼠14只,随机分为模型组和正常组,每组7只.对模型组大鼠采用慢性轻度不可预见性应激联合急性束缚应激制作IBS慢急性联合应激大鼠模型,以行为学方法 评估模型.以MALDI-TOF-MS技术观察大鼠结肠蛋白质伞景,从整体上探索IBS这一功能性肠病有无差异表达蛋白.结果 (1)一般情况:模型组体重低于正常组[(298.88±18.61)g比(348.00±12.44)g,P<0.01];肠道动力:模型组大鼠制模后1 h的排便颗粒数明显多于正常组[(6.00±1.69)粒/1h比(1.14±0.69)粒1 h,P<0.01];行为检测:模型组与正常组相比,糖水消耗量显著减少[(13.63±1.69)ml/1 h比(19.00±3.06)ml/1 h,P<0.05];内脏敏感性:模型组在各个气囊容量下腹肌收缩次数均明显高于正常组(P<0.05).(2)MALDI-TOF-MS 鉴定结果 :模型组与正常组大鼠结肠组织有12个标志蛋白表达有明显差异,分为4类,分别与肠上皮细胞离子分泌、蛋白质合成、G蛋白系统、免疫有关;12种差异表达蛋白在模型组均高于正常组(P<0.05).结论 慢急性联合应激大鼠可部分模拟人类IBS脑-肠交互作用.差异蛋白质的检测为IBS发病机制及治疗靶点的选择提供了参考依据.

A pilot study of protein fingerprinting in brain-gut interaction model of irritable bowel syndrome

Objective Matrix-assisted laser desorption ionization-time of might-mass spectrometry (MALDI-TOF-MS) was utilized to analyze the protein fingerprint in brain-gut interaction of irritable bowel syndrome (IBS) model rats' colon, so as to find the clues for IBS. Methods Fourteen healthy male adult Wistar rats were selected and divided into a control and a chronic and acute stress ( CAS) group. Colon motility, visceral sensation and behavior changes of rats were detected to evaluate the model. MALDI-TOF-MS was used to observe the overall view of protein in colon so as to study whether there are abnormalities of protein levels in IBS. Results As compared with those in the control group, the number of fecal pellets [ (6. 00 ± 1. 69 ) pellets/1 h vs ( 1. 14 ± 0. 69 ) pellets/1 h, P < 0. 01 ] and frequency of abdominal contraction induced by colorectal distention (CRD) increased, while the amount of weight gain [ (298. 88 ± 18.61)gvs (348. 00±12. 44)g, P<0.01] and consumption of sucrose solutions [ (13. 63 ± 1. 69) ml/1 h vs (19.00±3.06) ml/1 h, P<0.05] decreased in the CAS group (P <0. 05). As far as protein/peptide quality different peak was concerned, CAS rats had 12 different peaks compared with the control rats. The different proteins could be divided into 4 types, which were related to iron secretion, protein synthesis, G protein system and immunity. The protein levels of the model group were higher than those in the control group (P < 0. 05). Conclusions The CAS rats integrate the major characteristics of IBS such as altered colon motility, higher visceral hypersensitivity and psychiatric disorder and can mimic the brain-gut interaction of IBS partly. The detection of differential proteins provides reference for the pathogenesis and treatment of IBS.