Abstract
Porcine epidemic diarrhea virus (PEDV) is a main cause of severe enteric disease in piglets, leading to millions of dollars lost annually in the global pig industry. Parenteral vaccination is limited in generating sufficient mucosal immunity, which is crucial for early defense against PEDV. Here, we orally administered ginseng stem-leaf saponins (GSLS) to mice before parenteral vaccination and found that GSLS significantly enhanced the phagocytosis of dendritic cells, promoted the activities of CD4+ T cells and increased PEDV-specific IgA antibodies in the intestinal mucosa. Transcriptomic results showed that the altered genes following GSLS treatment were mostly related to the immune response and metabolism. In addition, integrated analysis of the transcriptome and metabolome revealed that the mechanism by which GSLS enhances mucosal immunity may be associated with progesterone-related pathways. Further studies are needed to explore the detailed molecular mechanisms.
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