ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2019, Vol. 50 ›› Issue (3): 581-591.doi: 10.11843/j.issn.0366-6964.2019.03.013

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Effects of Saccharomyces Cerevisiae and Its Inactivated Bacteria on the Expression of β-defensin-1 in Ruminal Explants of Sheep

WANG Yunhe1,2, JIN Xin1,2, ZHANG Man1,2, WEI Fang1,2, WEN Jingyi1,2, ZHAO Feifei1,2, YANG Yinfeng1,2*   

  1. 1. College of Veterinary Medicine, Inner Mongolia Agricultural University, Hohhot 010018, China;
    2. Key Laboratory of Clinical Diagnosis and Treatment Technology in Animal Disease of Ministry of Agriculture, Hohhot 010018, China
  • Received:2018-07-24 Online:2019-03-23 Published:2019-03-23

Abstract:

The aim of this study was to explore the effects of probiotic Saccharomyces cerevisiae (S.c) and inactivated S.c on the expression of sheep-defensin-1 (SBD-1) in rumen explants of sheep. After different concentrations (104, 105, 106, 107, 108, 109 CFU·mL-1) of S.c and inactivated S.c were respectively co-cultured with explants for 24 h, the expression of SBD-1 mRNA and protein in rumen explants were detected by qPCR and ELISA to determine the optimal concentration for the induction of SBD-1 expression by S.c and inactivated S.c. Then, the sheep rumen explants were stimulated with the optimal concentration of S.c and inactivated S.c for 2, 4, 8, 12, 16, 20, 24 h, respectively, and the SBD-1 mRNA and protein were also detected by qPCR and ELISA, so as to screen out the optimal time for the induction of SBD-1 expression by S.c and inactivated S.c. The results showed that S.c and inactivated S.c could significantly promote the expression of SBD-1 in rumen explants (P<0.05). When the rumen explants of sheep were stimulated by the concentration of 107 CFU·mL-1 for S.c and 108 CFU·mL-1 for inactivated S.c for 16 h, respectively, the expression level of SBD-1 were the highest, and which were significantly different from the control (P<0.01). Comparing the induction effects between S.c and inactivated S.c under optimal induction conditions, the S.c were better. Therefore, S.c and inactivated S.c could promote the SBD-1 expression in rumen explants of sheep, and the expression of SBD-1 reached the maximum when the rumen explants of sheep were stimulated by the concentration of 107 CFU·mL-1 for S.c and 108 CFU·mL-1 for inactivated S.c for 16 h. The induction effect of S.c is better than that of inactivated S.c.

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