畜牧兽医学报 ›› 2023, Vol. 54 ›› Issue (7): 2924-2931.doi: 10.11843/j.issn.0366-6964.2023.07.023

• 营养与饲料 • 上一篇    下一篇

基于流式细胞术分选绵羊分泌型IgA包裹的消化道细菌

米慧1, 彭灿1*, 贺志雄1,2*, 谭支良1,2   

  1. 1. 中国科学院亚热带农业生态研究所 亚热带农业生态过程重点实验室 畜禽养殖污染控制与资源化技术国家工程实验室 湖南省畜禽健康养殖工程技术研究中心 农业部中南动物营养与饲料科学观测实验站 动物营养生理与代谢过程湖南省重点实验室 中国科学院亚热带农业生态研究所公共技术中心, 长沙 410125;
    2. 中国科学院大学, 北京 100049
  • 收稿日期:2022-09-13 出版日期:2023-07-23 发布日期:2023-07-21
  • 通讯作者: 彭灿,主要从事细胞生物学研究;E-mail:pengcan@isa.ac.cn;贺志雄,主要从事幼龄反刍动物营养与免疫研究,E-mail:zxhe@isa.ac.cn
  • 作者简介:米慧(1997-),女,湖南邵阳人,硕士生,主要从事反刍动物营养研究,E-mail:18374962401@163.com
  • 基金资助:
    国家自然科学基金(32072760);湖南创新省份建设专项(2019RS3021)

Separation of Sheep Secretory Immunoglobulin A Coated Bacteria by Flow Cytometry

MI Hui1, PENG Can1*, HE Zhixiong1,2*, TAN Zhiliang1,2   

  1. 1. Institutional Center for Shared Technologies and Facilities of Institute of Subtropical Agriculture, Hunan Provincial Key Laboratory of Nutritional Physiology and Metabolic Process, South Central Experimental Station of Animal Nutrition and Feed Science in the Ministry of Agriculture, Hunan Research Center of Livestock & Poultry Sciences, National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry Production, Key Laboratory for Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2022-09-13 Online:2023-07-23 Published:2023-07-21

摘要: 本研究旨在建立1种基于流式细胞术(flow cytometry,FCM)的反刍动物消化道内容物中分泌型免疫球蛋白A (secretory immunoglobulin A,sIgA)包裹细菌的分选方法。随机选用4只健康、体况良好的成年肉用绵羊,采集回肠内容物制备菌液。对菌液上样浓度、细菌染料4’,6-二脒基-2-苯基吲哚(4’,6-diamidino-2-phenylindole,DAPI)最佳工作浓度和抗IgA抗体最佳使用浓度等进行优化。结果表明,内容物菌液最佳浓度为2.5~5 mg·mL-1,DAPI最佳工作浓度为5 μg·mL-1,抗IgA抗体最佳使用量为5 μg。重复性试验表明,该方法相对偏差小于5%,具有良好的稳定性和可重复性。本试验建立的sIgA包裹细菌分选方法选择性强、样品用量少、操作简单,可为反刍动物消化道sIgA包裹细菌的组成及功能等相关研究提供技术支撑。

关键词: 分泌型免疫球蛋白A, 分泌型免疫球蛋白A包裹细菌, 微生物, 流式细胞仪

Abstract: This study aimed to establish a flow cytometry (FCM) method for sorting secretory immunoglobulin A (sIgA) coated bacteria from the digestive tract contents of ruminants. Four healthy adult meat sheep in good physical condition were randomly selected and their ileal contents were collected to prepare the bacterial solution. The loading concentration of the bacterial solution, the working concentration of the bacterial dye 4', 6-diamidino-2-phenylindole (DAPI) and the anti-IgA antibody were optimized. The results showed that the optimal loading concentration of the bacterial solution of the contents was from 2.5 to 5 mg·mL-1, the best staining concentration of DAPI was 5 μg·mL-1, and the optimum amount of anti-IgA antibody was 5 μg. The reproducibility test results showed that the relative bias of the proposed method is less than 5% and that it is stable and reproducible. The sorting method of sIgA-coated bacteria established in this study is high selectivity, less sample consumption and easy operation and can provide technical support for related studies of the composition and function of sIgA-coated bacteria in ruminant digestive tracts.

Key words: secretory immunoglobulin A, secretory immunoglobulin A coated bacteria, microbe, flow cytometer

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