纤维素对化疗后大鼠肠结构和屏障功能的保护作用

目的评价纤维素对５氟尿嘧啶（５Ｆｕ）化疗后大鼠肠结构和屏障功能的影响。方法３０只Ｗｉｓｔａｒ大鼠随机分为饲料组（Ａ组）、肠内营养组（Ｂ组）和肠内营养加纤维素组（Ｃ组）,每组１０只。Ｂ组和Ｃ组为等氮和等热卡。它们分别进食或接受肠内营养支持８天。术后第４天用５Ｆｕ化疗,第３和第７天分别测肠通透性（Ｌ／Ｍ）,第８天测细菌移位、小肠和结肠的湿重、粘膜厚度、小肠的绒毛高度。实验前后分别测体重。结果Ｃ组体重丢失（－３１±３４ｇ）少于Ｂ组（－６６±５２ｇ）（Ｐ＜００５）,而Ａ组体重增加（４９±４３ｇ）,与Ｂ、Ｃ组比较差异有极显著意义（Ｐ＜００１）;Ｃ组的各项肠结构指标均优于Ｂ组（Ｐ＜００５）;化疗后Ｃ组和Ａ组的Ｌ／Ｍ变化无显著意义（Ｐ＞００５）,而Ｂ组的Ｌ／Ｍ有显著意义的升高（Ｐ＜００１）;Ｃ组与Ａ组的细菌移位率（２０％）低于Ｂ组（７０％）（Ｐ＜００５）。结论纤维素能保护５Ｆｕ化疗大鼠肠结构和屏障功能

Dietary fiber protects intestinal structure and barrier function

OBJECTIVE: To evaluate the effect of dietary fiber on intestinal structure and barrier function of 5-fluorouracil (5-Fu) challenged rat. METHOD: Thirty Wistar rats were divided randomly into three groups (10 each group): Chow, enteric nutrition (EN), and EN + Fiber group. Both EN and EN + Fiber group were isonitrogenic and isocaloric. The rats kept their diet respectively for 8 days. 5-Fu was injected intraperitoneally on day 4 postoperatively. Intestinal permeability (L/M) was measured respectively on day 3 and day 7. On day 8, the bacterial translation, wet weight and mucous thickness of both small intestine and colon and the villus height of small intestine were measured. The rats were weighted before and after experiment respectively. RESULT: The body weight loss of the EN + Fiber group (-3.1 +/- 3.4 g) was less than that of the EN group (-6.6 +/- 5.2 g) (P < 0.05), whereas the Chow group gained body weight (4.9 +/- 4.3 g) (P < 0.01 when compared with EN and EN + Fiber group). The parameters of intestinal structures of the EN + Fiber group was superior to the EN group (P < 0.05). The L/M of both EN + Fiber (from 0.0265 +/- 0.0073 to 0.0274 +/- 0.0068) and the Chow group (from 0.0268 +/- 0.0039 to 0.0281 +/- 0.0044) was unchanged (P > 0.05 for both) after 5-Fu challenged, whereas that of the EN group increased (from 0.0289 +/- 0.0070 to 0.0331 +/- 0.0084) (P < 0.01). The incidence of bacterial translocation to MLN of both EN + Fiber group and the Chow group (20%) was lower than that of the EN group (70%) (P < 0.05). CONCLUSION: The dietary fiber protects the intestinal structure and barrier function of 5-Fu challenged rats.