机构地区:[1]中国医学科学院北京协和医学院北京协和医院肠外肠内营养科协和转化医学中心,100730
出 处:《中华临床营养杂志》2013年第1期17-22,共6页Chinese Journal of Clinical Nutrition
基 金:北京自然科学基金资助项目(7102127)
摘 要:目的研究肠道缺血再灌注损伤时肠道黏膜损伤和血浆游离氨基酸的变化。方法24只健康雄性SD大鼠随机分为3组(每组8只):空白组、假手术组和肠道缺血再灌注(I/R)组。测定所有大鼠空肠和回肠黏膜的厚度和绒毛高度,进行下腔静脉取血,血浆沉淀蛋白质后测定游离氨基酸水平。结果I/R组与空白组和假手术组比较,空、回肠的黏膜厚度和绒毛高度明显下降[空肠黏膜厚度:(401.50±117.79)、(529.22±54.73)、(499.54±64.48)μm,F=31.869,P=0.000;空肠绒毛高度:(271.37±84.29)、(365.26±46.98)、(349.67±56.11)μm,F=30.472,P=0.000;回肠黏膜厚度:(254.20±43.56)、(324.70±30.56)、(298.26±58.46)μm,F=30.442,P=0.000;回肠绒毛高度:(169.37±37.25)、(221.62±37.26)、(193.25±38.39)μm,F=24.145,P=0.000],假手术组和I/R组的血浆总游离氨基酸(F=5.075,P=0.016)、8种必需氨基酸(F=11.216,P=0.000)、谷氨酰胺(F=4.326,P=0.027)和支链氨基酸(BCAA)(F=10.662,P=0.001)较空白组降低,差异均有统计学意义(P均〈0.05),且I/R组的必需氨基酸和支链氨基酸水平明显低于假手术组(P均〈0.05)。芳香族氨基酸在3组中的含量差异无统计学意义(F=0.578,P=0.570)。假手术组和I/R组的支链氨基酸/芳香族氨基酸比值显著低于空白组[(2.4±0.6)、(1.9±0.4)、(3.1±0.7),F=5.215,P=0.014],I/R组低于假手术组,但差异无统计学意义(P〉0.05)。假手术组和I/R组磷酸乙醇胺(F=5.897,P=0.009)、牛磺酸(F=10.702,P=0.001)、瓜氨酸(F=6.360,P=0.007)、胱氨酸(F=15.344,P=0.000)和磷酸丝氨酸(F=4.878,P=0.018)水平较空白组均有所降低,且I/R组的牛磺酸和胱氨酸与假手术组相比明显减少(P均〈0.05)。I/R组血浆鸟氨酸(F=4.961,P=0.017)、精氨酸(F=13.940,P=0.000)浓度低于空白组和假手术组,差异均有统计学意义�ObjectiveTo investigate intestinal mucosal injury and the change of free amino acid levels in plasma with intestinal ischemia/reperfusion. MethodsTwenty-four Sprague-Dawley(SD) male rats (SPF grade) were randomly divided into 3 groups with 8 rats in each group: Blank group, Sham group and ischemia/reperfusion(I/R) group. The rats in I/R group were subjected to 60 min ischemia by clamping the superior mesenteric artery (SMA), followed by 120 min reperfusion. All rats were sacrificed with blood withdraw through inferior vena cava. The plasma was precipitated with Sulfosalicylic acid and the supernatant free amino acid levels were measured and the intestinal mucosal thickness and villus length were also assayed. ResultsIn the I/R group the total free amino acids, essential amino acids (EAA), glutamine and branched-chain amino acids (BCCA) were remarkably lower [the total free amino acids: I/R vs Blank vs Sham: (4585.1±326.1) vs (5661.5±581.9) vs (5337.9±998.7) μmol/L (F=5.075, P=0.016); EAA: I/R vs Blank vs Sham:(1401.3±183.4) vs (2147.6±265.1) vs (1796.2±440.8) μmol/L (F=11.216, P=0.000); glutamine: I/R vs Blank vs Sham:(646.1±34.7) vs (895.7±258.8) vs (839.1±163.7) μmol/L (F=4.326, P=0.027); BCCA: I/R vs Blank vs Sham:(507.8±119.0) vs (912.2±165.8) vs (671.9±79.8) μmol/L (F=10.662, P=0.001)] and the jejunum and ileum mucosal thickness and villus height were decreased compared to Blank and Sham groups [jejunum mucosal thickness:I/R vs Blank vs Sham:(401.50±117.79)vs (529.22±54.73) vs (499.54±64.48) μm (F=31.869, P=0.000); jejunum villus height:I/R vs Blank vs Sham:(271.37±84.29) vs (365.26±46.98) vs (349.67±56.11) μm (F=30.472, P=0.000); ileum mucosal thickness:I/R vs Blank vs Sham:(254.20±43.56) vs (324.70±30.56) vs (298.26±58.46) μm (F=30.442, P=0.000); ileum villus height:I/R vs Blank vs Sham:(169.37±37.25) vs �
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