Furthermore, the FOS, L. plantarum, or FOS + L. plantarum treatment also decreased the invasion of L. monocytogenes to Caco-2 and BeWo cells, and down-regulated the expression levels of the inlA, inlB, hly, actA, sigB, and prfA genes of L. monocytogenes, which play key roles in the infection process of L. monocytogenes. Here, ACTA1 is linked to infection.