《中国畜牧兽医》 ›› 2017, Vol. 44 ›› Issue (9): 2816-2821.doi: 10.16431/j.cnki.1671-7236.2017.09.038

• 基础兽医 • 上一篇    下一篇

表达耐热肠毒素的重组大肠杆菌对7日龄仔猪肠道形态结构及抗氧化功能的影响

吕阳1, 张林2, 李雪妮1, 赵迪1, 吴涛1   

  1. 1. 武汉轻工大学, 动物营养与饲料科学湖北省重点实验室, 武汉 430023;
    2. 中国水产科学研究院长江水产研究所, 农业部淡水鱼种质量监督检测中心, 武汉 430070
  • 收稿日期:2017-02-10 出版日期:2017-09-20 发布日期:2017-09-22
  • 通讯作者: 吴涛 E-mail:wtao05@163.com
  • 作者简介:吕阳(1993-),男,内蒙古呼伦贝尔人,硕士生,研究方向:营养生化与代谢调控,E-mail:523738285@qq.com
  • 基金资助:

    国家自然科学基金项目(31302089);湖北省自然科学基金项目(2012FFBO4804)

Effects of Recombinant E. coli Expressing Heat-stable Enterotoxin on Intestinal Morphology and Antioxidant Capacity in Seven Days old Piglets

LV Yang1, ZHANG Lin2, LI Xue-ni1, ZHAO Di1, WU Tao1   

  1. 1. Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University, Wuhan 430023, China;
    2. Freshwater Fish Germ Plasm Quality Supervision and Testing Center, Ministry of Agriculture, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430070, China
  • Received:2017-02-10 Online:2017-09-20 Published:2017-09-22

摘要:

试验旨在研究表达耐热肠毒素(STa)的重组大肠杆菌对7日龄仔猪肠道形态结构及抗氧化功能的影响。选取24头7日龄仔猪,随机分在4个日粮处理组,分别为对照组(人工乳),STa组(人工乳+2×109 CFU重组菌LMG194-pBAD-STa),LMG194组(人工乳+2×109 CFU大肠杆菌LMG194),K88组(人工乳+2×109 CFU大肠杆菌K88)。试验第5天进行攻毒,第7天屠宰取样,测量小肠黏膜的绒毛高度和隐窝深度,检测空肠、回肠、结肠及血清中的过氧化氢酶(CAT)、总一氧化氮合成酶(TNOS)与诱导型一氧化氮合酶(iNOS)的活力及血清中丙二醛(MDA)与过氧化氢(H2O2)的含量。试验结果表明,与对照组相比,STa组仔猪各肠段绒毛高度均显著降低(P<0.05),十二指肠隐窝深度及绒毛高度与隐窝深度的比值显著降低(P<0.05),十二指肠、空肠、回肠绒毛表面积显著降低(P<0.05);同时,STa组回肠、结肠CAT活力显著降低,血清、空肠、回肠和结肠中的TNOS活力显著降低(P<0.05),STa组结肠iNOS活力显著降低(P<0.05),STa组血清中的MDA与H2O2含量显著提高(P<0.05)。结果显示,表达STa的重组大肠杆菌可导致7日龄仔猪肠道结构损伤和抗氧化能力下降。

关键词: 耐热肠毒素(STa); 重组大肠杆菌; 肠黏膜结构; 抗氧化

Abstract:

This experiment was conducted to investigate the effects of recombinant E.coli expressing heat-stable enterotoxin(STa) on intestinal absorption and barrier function, intestinal morphology and antioxidant capacity of 7 days old piglets. Twenty-four 7 days old piglets were allotted to four treatments:control group (artificial milk), STa group (artificial milk +2×109 CFU E.coli LMG194-pBAD-STa), LMG194 group (artificial milk +2×109 CFU E.coli LMG194), and K88 group (artificial milk +2×109 CFU E.coli K88).The pigs were treated with E.coli on the 5th day and slaughtered on the 7th day. The results showed that, compared with the control group, villus height in jejunum, ileum and duodenum, crypt depth and villus height/crypt depth in duodenum, and small intestine villi surface area were significantly decreased in STa group (P<0.05). The activities of catalase (CAT) in ileum and colon, total nitric oxide synthase (TNOS) in serum, ileum, jejunum and colon, inducible nitric oxide synthase (iNOS) in colon were significantly decreased in STa group (P<0.05). STa group also had a higher levels of malondialdehyde (MDA) and hydrogen peroxide (H2O2) in serum (P<0.05). These results suggested that recombinant E.coli expressing STa could lead to intestinal injury and oxidative stress of 7 days old piglets.

Key words: heat-stable enterotoxin(STa); recombinant E.coli; intestinal morphology; antioxidant

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