Abstract
Deaths due to cancer have been increasing in many countries in recent years. One of the beneficial probiotic properties is potential of antimutagenic and anticancer effects. The aim of this study was to investigate antimutagenic and anticancer effects of 25 strains of lactobacilli spp isolated from Tarhana in vitro conditions and to identify selected strains based on molecular biology. Antimutagenicity and anticarcinogenicity tests were performed based on proposed method of Professor Ames et al. Identification of selected strains was performed based on biochemical and molecular tests. Study of antimutagenic and anticancer effects of 25 different strains led to identification of 4 isolates of Lactobacillus spp. Higher antimutagenic activities against sodium azide were observed in cell suspensions of 4 strains as compared with their supernatants. So the inhibitory percentage of cell suspensions among 4 strains was equal to 60.38% in its highest level. Antimutagenicity of these strains was also increased in the presence of rat S9. Four selected strains were identified based on 16S rDNA sequence. Lactobacillus casei, Lactobacillus plantarum, and Lactobacillus brevis isolated from Tarhana exhibited high antimutagenic and anticancer activity. Of 25 strains of lactobacilli, 4 strains with the highest antimutagenicity effect were chosen as new potential probiotic strains.
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