网络首发:2015-12-20,
纸质出版:2015
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感染后肠易激综合征小鼠肠黏膜和血中细胞因子的表达变化[J]. 中山大学学报(医学科学版), 2015,36(6).
Altered Expression of Intestinal Mucosa and Blood Cytokines in Post -infectious Irritable Bowel Syndrome Mouse[J]. Journal of Sun Yat-sen University (Medical Sciences), 2015, 36(6).
摘 要: 【目的】 观察感染后肠易激综合征小鼠不同肠段和外周血中IFN-γ、IL-17、IL-10的表达及以上细胞因子的改变对肠道动力和内脏敏感性的影响。【方法】 40只雌性C57BL\6小鼠随机分为PI-IBS组和对照组,每组20只。PI-IBS组小鼠用0.2 mL含350条旋毛虫幼虫的生理盐水悬液灌胃,对照组给予等体积的生理盐水。分别于感染后第2、4、8周,取末端回肠和近端结肠进行组织病理学检测。于感染后第8周通过检测小鼠腹壁撤退反射(AWR)评分评估小鼠对结直肠扩张的内脏敏感性变化,检测肠道传输时间(ITT)和粪便含水百分数评估小鼠肠道动力的改变;采用ELISA测定十二指肠、空肠、回肠、结肠和外周血中IFN-γ、 IL-17 和 IL-10水平的改变。 【结果】 感染后第8周,PI-IBS小鼠肠道急性炎症完全恢复至正常;在结直肠扩张容量为0.35和0.5 mL时,模型组AWR评分均显著高于对照组(P < 0.01); PI-IBS小鼠肠道传输时间缩短、每2 h粪便含水百分数增高,较正常对照组具有显著性差异(P < 0.01);ELISA结果显示:与对照组相比,PI-IBS组小鼠的IFN-γ和IL-17水平在十二指肠、回肠和外周血中表达升高(P < 0.05);而IL-10水平在空肠、回肠、结肠以及外周血中的表达显著降低(P < 0.05)。【结论】 感染后肠易激综合征小鼠不同肠段组织中细胞因子表达水平存在差异,外周血与部分肠段组织中细胞因子的表达变化呈同步化改变。细胞因子的改变可能是PI-IBS内脏敏感性增高和肠道运动功能紊乱的机制之一。
Abstract: 【Objective】 To observe the expressions of IFN -γ, IL -17, and IL -10 of different intestinal segments and peripheral blood and the effects of changes of those cytokines on intestinal motility and visceral sensitivity in mice with post -infectious irritable bowel syndrome (PI -IBS). 【Methods】 Forty female C57BL\6 mice were randomly divided into the PI -IBS group (n = 20) and control group (n = 20). Mice of the PI -IBS group were infected by gavaging of 350 T. spiralis larvae in 0.2 mL of normal saline, while the control group received the same volume of saline solution. At week 2, 4, 8 post -infection, tissues of terminal ileum and proximate colon were collected for pathological examinations. At week 8 post -infection, visceral sensitivity of colorectal distention in mice was accessed by abdominal withdrawal reflex (AWR). The change of intestinal motility was accessed by intestinal transmission time (ITT) and water content percentages of feces per 2h. The expressions of IFN -γ, IL -17, and IL -10 in different intestinal segments and peripheral blood were quantified by the method of ELISA. 【Results】 At week 8 post -infection, the intestinal acute inflammation recovered to normal. At distention volumes of 0.35, 0.5 mL, the AWR scores of PI -IBS groups were higher than that in the control groups (P < 0.01), ITT of the PI -IBS mice was shorter and the water content percentages of feces per 2h were higher than those of the control mice, and the difference was statistically significant (P < 0.01). Results of ELISA showed that compared to the control mice, the IFN-γ and IL-17 levels were up-regulated in duodenum, ileum and peripheral blood (P < 0.05), while IL-10 levels were decreased in jejunum, ileum, colon and peripheral blood in PI-IBS group (P < 0.05). 【Conclusions】 The expression of cytokines of different intestinal segments was difference in mice with post-infectious irritable bowel syndrome and the variation trend of cytokine levels in blood and part of the bowel tissue was synchronous. The changes of cytokines may be one of the mechanisms of visceral hypersensitivity and intestinal motility dysfunction in PI-IBS.
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