维生素A调节小鼠肠黏膜淋巴细胞免疫功能的作用

Effects of vitamin A on the immune function of intestinal mucosa lymphocytes in mice

摘要:

目的：探讨维生素A对小鼠外周血及肠黏膜T淋巴细胞亚群发育及肠黏膜分泌细胞因子水平的影响。方法：幼鼠共20只，随机分为高维生素A组（维生素A 250 IU/g）及对照组（维生素A 4 IU/g），每组10只，干预3周后应用流式细胞术测定小鼠外周血及肠黏膜CD4+ CD25+ T细胞亚群，应用ELISA法测定小鼠粪便中细胞因子IFN-γ、IL-4、IL-17及IL-23水平。结果：高维生素A组外周血及肠黏膜CD4+CD25+T细胞水平高于对照组(P<0.05)，粪便中IL-4水平高于对照组(P<0.05)，IL-23水平低于对照组(P<0.05)。结论：维生素A对小鼠外周血及小肠CD4+ CD25+ T细胞发育有促进作用,可能通过调节IL-4及IL-23等细胞因子参与肠黏膜相关免疫反应。［中国当代儿科杂志，2010，12(12)：976-978］

Abstract:

OBJECTIVE: To study the effects of vitamin A on the development of T lymphocytes in peripheral blood and small intestine and on the cytokine response of intestinal mucosa in mice. METHODS: Twenty young mice were randomly fed with forage containing vitamin A 250 or 4 IU/g (n=10 each). Three weeks later, the levels of CD4+ CD25+ T subsets in peripheral blood and intestinal mucosa were measured by flow cytometry. The levels of cytokines IFN-γ, IL-4, IL-17 and IL-23 in stool were measured using ELISA. RESULTS: The levels of CD4+ CD25+ T subsets in peripheral blood and intestinal mucosa in the 250 IU/g vitamin A group were significantly higher than those in the 4 IU/g vitamin A group (P<0.05). The IL-4 level in stool increased, in contrast, the IL-23 level in stool decreased significantly in the 250 IU/g vitamin A group when compared with the 4 IU/g vitamin A group (P<0.05). CONCLUSIONS: vitamin A may promote the development of CD4+ CD25+ T lymphocytes in peripheral blood and small intestine. Moreover, it may be involved in intestinal mucosa-associated immune response by regulating cytokines IL-4 and IL-23.［Chin J Contemp Pediatr, 2010, 12 (12):976-978］