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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Probiotic Features of Lactic Acid Bacteria Isolated from a Diverse Pool of Traditional Greek Dairy Products Regarding Specific Strain-Host Interactions.
Probiotics and Antimicrobial Proteins 2018 June
The increased consumers' interest on the positive role of food in wellbeing and health underscores the need to determine new probiotic microorganisms. Triggered by the fact that artisanal food products can be a valuable source of novel probiotic strains, 106 lactic acid bacteria, all isolated from traditional Greek dairy products, namely Feta, Kasseri, Xynotyri, Graviera, Formaela, Galotyri, and Kefalotyri cheeses as well as yogurt and milk, were studied for probiotic properties. Based on their survival at pH 2.5 and their stability in the presence of bile salts, 20 strains were selected for further analysis. These strains exhibited diverse susceptibility to commonly used antibiotics, while none was hemolytic. Seven out of the 20 strains produced functional bile salt hydrolases in vitro. The only antimicrobial activity detected of Streptococcus thermophilus ACA-DC 26 against the oral pathogen Streptococcus mutans LMG 14558T was attributed to compound(s) of proteinaceous nature. Two Lactobacillus plantarum strains, namely ACA-DC 2640 and ACA-DC 4039, displayed the highest adhesion according to a collagen-based microplate assay and by using ΗΤ-29 and Caco-2 cells. Co-cultivation of THP-1 cells with selected strains indicated a tendency for anti-inflammatory modulation by Lactobacillus plantarum ACA-DC 2640 as well as Streptococcus thermophilus ACA-DC 26 and ACA-DC 170, as shown by an increase in IL10 mRNA levels. Moreover, milk cell-free supernatants of Lactobacillus plantarum ACA-DC 2640 and ACA-DC 4039 exhibited strong angiotensin I-converting enzyme inhibition. To conclude, new isolates presenting interesting probiotic features were described and should be further investigated as health-promoting factors.
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