Effects of Biosurfactants Derived From Lactobacillus Casei and Lactobacillus Reuteri on Gene Expression Profile of Gtfb/C and Ftf Genes in Lactobacillus Mutans



Savabi O¹ ; Kazemi M² ; Salehi R² Show Affiliations
Source: Journal of Isfahan Medical School Published:2014

Abstract

Background: Dental caries is a worldwide health problem involving almost all age groups in underdeveloped as well as developed countries. So for no considerable progress achieved in the disease prevention, so new preventive/thrapeutique measures are urgently needed. Probiotic bacteria and their biproducts, like biosurfactants, are cost-effective with no considerable side effects for dental caries prevention. The aim of the present study was to evaluate the effects of biosurfactants purified from Lactobacillus casei (ATCC39392) and Lactobacillus reuteri (DSM20016) on ftf and gtf B/C gene expression level of the standard strains of streptococcus mutans (ATCC35668). Methods: Lactobacillus species purchased from the bacterial collection center of Iran. For biofilm production, microtiter plate assay in presence of 1% glucose was used. For biosurfactant production, lactobacillus species were cultured in MRS broth medium, dialyzed and lyophilized using freezedryer. To evaluate the effects of biosurfactant on gene expression, bacterial cells were cultured in presence of the appropriate biosurfactant (2.5 mg/ml); after four hours incubation, total cellular RNA was then extracted and used for cDNA synthesis. Findings: Expression of ftf and gtf B/C genes of the standard strains of Streptococcus mutans (ATCC35668) was considerably down regulated by the application of the biosurfactants. The reduction in gene expression was statistically significant (P < 0.05). Conclusion: Considerable down regulation of all genes in presence of biosurfactants was observed. Therefore, it is concluded that the biosurfactants prepared in this study is very successful in dental caries prevention.