含谷氨酰胺二肽全肠外营养对急性放射性小肠炎的营养作用

The effects of TPN-Gln on acute radlation enteritis

作者将３４只Ｓｐｒａｇｕｅ－Ｄａｗｌｅｙ大鼠随机分四组，Ａ组不含丙氨酰－谷氨酰胺二肽（Ａｌａ－Ｇｌｎ），而给予相应量的甘、丝、丙及脯氨酸的常规全肠外营养（ＴＰＮ－Ｃｏｎｖ）；Ｂ组含Ａｌａ－Ｇｌｎ的全肠外营养（ＴＰＮ－Ｇｌｎ）；两组间的热、氮及液体量相同。Ｃ组为消化道营养组。Ｄ组为正常组。实验组给予８戈瑞（ＧＹ）剂量全腹照射，然后分别给予ＴＰＮ及肠道营养７天。观察在急性放射性小肠炎时，Ａｌａ－Ｇｌｎ作为Ｇｌｎ源对小肠的代谢、结构及功能的影响，及经消化道营养的作用。实验结果表明，Ｂ组动脉血Ｇｌｎ浓度显著高于其它各组（Ｐ＜０．０５），说明Ａｌａ－Ｇｌｎ二肽输入后迅速分解为游离谷氨酰胺，利于组织使用。其小肠蛋白质和ＤＮＡ含量优于Ａ组。形态学结果显示组Ｂ小肠壁全层厚度、粘膜厚度及绒毛高度显著高于Ａ和Ｃ组（Ｐ＜０．０００１），且小肠腺窝细胞平均分裂数高于Ａ和Ｃ组（Ｐ＜０．０５），肠道内细菌移位率亦低于Ａ和Ｃ组（Ｐ＜０．０５）。粘液血便及体重降低以Ａ、Ｃ组为重。Ｃ组的摄食量不足，氮和热量摄取低于Ａ、Ｂ组，其体重下降超过Ｂ组。Ｃ组８只实验大鼠死亡２只，其中１只为末段回肠穿孔。Ａ、Ｂ组中无１例发生死亡及并发症。

Abstract:34 Sprague-Dawley rats were divided into four groups randomly, group A:TPN-Conv, group B: TPN-Gln, group C: TEN and group D: control. The Abdomen of rats were irradiated by a 8 Gy bolus, then TPN and TEN support were used respectively for 7 days. We found that the arterial blood concentration of Gln in TPN-Gln group was higher than that in other groups(P<0.05). The gut protein and DNA content was also more than that of group A. Morphological analysis suggested the thickness of gut wall and mucosa as well as villus height was remarkably higher than group A and C(P<0.0001). The rate of bacteria translocation and weight loss in TPN-Gln group were low.