Acta Veterinaria et Zootechnica Sinica ›› 2020, Vol. 51 ›› Issue (3): 630-638.doi: 10.11843/j.issn.0366-6964.2020.03.023

• CLINICAL VETERINARY MEDICINE • Previous Articles     Next Articles

Effects of Zhukuqin Compound Extractive Fluid on iIELs and the Transcription of INF-γ and IL-4 mRNA in the Duodenum of Diarrhea Mice

WANG Zhongqing1, WU Qiuyue1, HU Qiao1, ZHOU Meifang1, LIU Juan1,2*   

  1. 1. College of Animal Science, Southwest University, Chongqing 402460, China;
    2. Chinese Veterinary Herbal Drugs Innovation Research Lab, University Veterinary Science Engineering Research Center in Chongqing, Chongqing 402460, China
  • Received:2019-08-28 Online:2020-03-25 Published:2020-03-20

Abstract: To study the effects of Zhukuqin compound extractive fluid on intestinal intraepithelial lymphocyte (iIELs) and the transcription of INF-γ and IL-4 mRNA in the duodenum of diarrhea mice. A total of 72 mice were randomly divided into six groups equally:control group, infection group, positive drug group (Astragalus polysaccharide oral liquid, the concentration was 1.2 mg·mL-1), and drug group Ⅰ, Ⅱ, Ⅲ (Zhukuqin extractive fluid, the concentrations were 0.1, 1 and 10 mg·mL-1, respectively). After continuously pre-administration for 7 days (0.5 mL, once daily dosing), except the control group, the mice in each group were intraperitoneally injected with E. coli (5×107CFU). The time point was selected as 0 h when mice appeared diarrhea in the infection group. Six mice were killed for preparing pathological sections, the number of iIELs in the small intestine was counted, and the mRNA level of INF-γ and IL-4 in the duodenum were analyzed by quantitative real-time PCR at 6 h and 4 d, respectively. The diarrhea protective rate of positive drug group and drug group Ⅰ, Ⅱ, Ⅲ were 66.7%, 50.0%, 66.7%, and 75.0%, respectively. At 6 h, compared with control group, the number of iIELs in infection group was significantly increased, and the mRNA level of INF-γ and IL-4 were observably reduced and strengthened, respectively (P<0.01); Compared with infection group, the number of iIELs in positive drug group and drug group Ⅰ, Ⅱ, Ⅲ were decreased, and the mRNA level of INF-γ and IL-4 in positive drug group and drug group Ⅲ were augmented and lessened, respectively. At 4 d, compared with control group, the quantity of iIELs in the duodenum and ileum in infection group were markedly heightened, while that in the jejunum was dropped, and the mRNA level of INF-γ and IL-4 were dramatically enhanced (P<0.01); Compared with infection group, the number of iIELs in the duodenum and ileum in positive drug group and drug group Ⅰ, Ⅱ, Ⅲ were significantly diminished (except that in duodenum of group Ⅰ), and that in the jejunum was aggrandized, and the mRNA level of INF-γ and IL-4 in positive drug group and drug Ⅲ group were decreased. The results of the current study show that Zhukuqin compound extractive fluid can protect the diarrhea mice, via regulating the number of iIELs in the small intestine and balancing the transcription of INF-γ and IL-4 mRNA in the duodenum of mice.

Key words: Zhukuqin compound, intestinal mucosa barrier, iIELs, INF-γ, IL-4

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