Similarly, the IL-10/IL-12 ratio was significantly higher (p < 0.001) upon stimulation with L. plantarum Δpst19ADCBR compared with the parental strain (Figure 4 and Table 3). L. plantarum strains harboring lp_1953 were also predicted to induce higher IL-10 production levels compared with strains lacking this gene. However, the L. plantarum lp_1953 deletion mutant stimulated equivalent amounts of IL-10 and somewhat higher IL-10/IL -12 ratios (adj. p value = 0.024) relative to wild-type L. plantarum WCFS1 (Figure 4 and Table 3). Selleck Maraviroc Although the lp_1953 mutant induces a modest, yet significantly different, IL-10/IL-12 response relative to the parental strain, these results are not in agreement with the immunomodulatory effects
predicted for this gene. In summary, of the 5 mutants tested here, three (ΔlamA ΔlamR, Δpst19ADCBR, and ΔplnG) significantly affected the immune response
of PBMCs in different donors according to the phenotypes predicted from the gene-trait matching data (Table 2). The plnEFI mutant also affected the immune response Staurosporine purchase in the predicted manner but this was not significant considering the adjusted p value. The ΔlamA ΔlamR mutant conferred the largest differences on the induction of IL-10 and IL-12 and the IL-10/IL-12 ratio by L. plantarum (Table 3). Discussion This study demonstrated the diverse capacities of L. plantarum strains to stimulate cytokine production in human PBMCs and confirmed the contributions of specific L. plantarum genes to modulate these responses. Forty-two
L. plantarum strains induced PBMCs to secrete IL-10 over an average 14-fold range. This range was similar to IL-10 amounts stimulated by 7 Bifidobacterium longum strains [43] and the 10 to 15-fold differences in cytokine amounts induced in PBMCs by multiple Lactobacillus and Bifidobacterium species [7–11]. Moreover, we found that variation in IL-10 and IL-12 amounts and IL-10/IL-12 ratios induced by the distinct L. plantarum strains was higher than reported previously [44]. This result was probably due to the analysis of more strains in the present study (42 versus 3), which were isolated from diverse environmental niches encompassing a greater genetic and phenotypic diversity of the L. plantarum species. Such before strain-specific differences should therefore be taken into consideration when selecting a probiotic Lactobacillus culture for health conditions which are dependent on modulating immunity such as in the prevention of allergy, eczema, or inflammatory bowel disease. To identify L. plantarum genes with roles in modulating immune cell responses, L. plantarum genetic diversity was correlated with strain-specific capacities to induce cytokines in PBMCs. Genes with putative contributions to the observed PBMC responses were further investigated in L. plantarum WCFS1. A similar gene-trait matching approach previously resulted in the identification of a L. plantarum mannose-specific adhesin (Msa) [45] and genes which modulate dendritic cell responses [46].
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