4.7 Article

Yeast cell wall upregulated cell-mediated immune responses to Newcastle disease virus vaccine

期刊

POULTRY SCIENCE
卷 101, 期 4, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.psj.2022.101712

关键词

yeast cell wall product; cytokine response; lymphocyte proliferation; mRNA expression; safety

资金

  1. National Natural Science Foundation of China [32002325]
  2. Chongqing Research Program of Basic and Frontier Technology [cstc2020jcy-jmsxmX0418]
  3. Fundamental Research Funds for the Central Universities [SWU119056]

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A recent study found that yeast cell wall product (YP) can enhance the immune responses in chickens immunized with NDV vaccine. The study investigated the cell-mediated immune responses elicited by NDV and YP in commercial broilers. The results showed that YP increased the concentration of certain immune factors in the blood and promoted lymphocyte proliferation. The study also found upregulated gene expression in the spleen and jejunum.
A recent study has suggested that yeast cell wall product (YP) enhanced serum hemagglutination inhibition (HI) titers and intestinal sIgA responses in chickens immunized with Newcastle disease virus (NDV) vaccine. In the present study, the cell-mediated immune responses elicited by NDV and YP were investigated in commercial broilers. Broilers were fed 0 or 0.1% YP and immunized with a live NDV vaccine via an intraocular-and-intranasal route at 14 and 28 days old. After that, blood samples were collected for determination of HI titer, cytokine content, and blood analysis. Eight chickens were randomly selected from each group and sacrificed. Lymphocytes were harvested from the spleens for lymphocyte proliferation and flow cytometry analysis. Total RNA was extracted from spleen and jejunum for RT-qPCR analysis. The results showed that YP significantly increased serum concentration of IL-4, IL-6, IFN-gamma, TNF-beta, as well as promoted lymphocytes proliferation in broilers immunized with NDV vaccine. The enhanced cell-mediated immunity is correlated with the upregulated mRNA expression of TGF-beta, IL-6, TLR5, GATA-3, and T-bet in the spleen and upregulated mRNA expression of CCR-9, J-chain, pIgR, and TLR3 in the jejunum of chickens. It is noteworthy that no significant side effect was observed after the administration of YP. Therefore, YP could be safely used as potential immunopotentiator assisting NDV vaccine for chickens.

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