Evaluation the Effect of Royal Jelly on the Growth of Two Members of Gut Microbiota; Bacteroides fragillis and Bacteroides thetaiotaomicron
AbstractObjective: In this study the effect of Royal jelly on the growth of two important members of Bacteroides spp.; Bacteroides fragilis and Bacteroides thetaiotaomicron, was evaluated. Also the physicochemical properties and cytotoxicity effects of Royal jelly on Caco-2 cell line as gastrointestinal epithelial cell model, assessed.
Methods : Bacteria, Bacteroides fragilis and Bacteroides thetaiotaomicron were grown on brain heart infusion (BHI) broth medium supplemented with Royal jelly in 3 different concentrations (2.5, 5 and 10% v/v), both of the bacteria (1.5×108 cfu/mL) were inoculated to BHI broth contained Royal jelly in anaerobic condition. To calculate the bacterial optical density (OD), the absorbance was measured at 600 nm after an overnight. Also Caco-2 cells, was used to study the effects of Royal jelly on epithelial cell viability, and the Physicochemical properties consist of total proteins, polysaccharides, phenolic compounds, total lipids, ash and moisture by UV-VIS spectrophotometric and gravimetric methods were evaluated .
Results: The growth of B. fragillis and B. thetaiotaomicron were increased by Royal jelly (2.5, 5 and 10% v/v concentrations) and the results indicated that Royal jelly increased the growth of bacteria in a dose dependent manner (p<0.001). In addition MTT assay showed more than 95% viability of Caco-2 cells treated with Royal jelly. The Iranian Royal jelly sample contains 59.01% water, 11.57% proteins, 12% lipids, 12.63 % polysaccharide and 5% mineral.
Conclusion: The present study showed that Royal jelly has a potential effect in the preserving gut microbiota and it is suggested that Royal jelly as a complementary and alternative medicine can be used to treatment diseases are associated with gut microbiota- host interactions and immune regulating. Although we need to expand our knowledge by designing clinical trials to conﬁrm the therapeutic effects of Royal jelly on gut microbiota modulation as a barrier function.
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