C-ACTI - Communications avec actes dans un congrès international
Streptococcus thermophilus: anti-inflammatory potential of surface protein derived-peptides
5th Edition of Innovations in Food Science and Human Nutrition (IFHN-2022), 20-21 septembre, Barcelone, Espagne
Allouche, R., Hafeez, Z., Dary-Mourot, A., Genay, M., Miclo, L.
C-COM - Communications orales sans actes dans un congrès international ou national
Are peptides released from surface proteins of S. thermophilus contributing to its anti-inflammatory activity in vitro?
23ème Colloque du Club des Bactéries Lactiques, 08-10 juin, Rennes, France
Allouche, R., Hafeez, Z., Papier, F., Dary-Mourot, A., Genay, M., Miclo, L.
See the abstract
Inflammation provides protection against injury, trauma or infection caused by damaged cells, irritants, or pathogens. This process eliminates injurious agents or intruders and clear components of damaged tissues. Nevertheless, low grade chronic inflammation is often associated with various pathologies. Attention is paid on bioactive peptides released from food proteins that could modulate inflammatory key factors and consequently delay the onset of these chronic diseases. Moreover, LAB, components of fermented dairy products, have also been reported to display anti-inflammatory properties both in in vitro and in vivo studies.
Among LAB, Streptococcus thermophilus is widely used as a starter culture in the dairy industry. It is largely and regularly consumed by a significant proportion of the population in fermented milk products. Studies revealed that some strains of S. thermophilus displayed an anti-inflammatory activity in vitro but the mechanism is unknown. Thus, the assumption that peptides generated in the gastro-intestinal tract from hydrolysis of S. thermophilus surface proteins could display an anti-inflammatory activity and contribute to the overall anti-inflammatory effect of the bacterium can be made. After proteolytic “shaving” of S. thermophilus cells with digestive enzymes and subsequent mass spectrometry analysis, it was found that the majority of the identified peptides belongs to the surface-located proteins of this bacterium. The total set of peptides from surface proteins showed an anti-inflammatory activity since secretion of IL-8 and IL-1? cytokines by in macrophage-like THP-1 cells was reduced after LPS-induced inflammation. The results suggest that the peptides from surface proteins of S. thermophilus may contribute to the potential anti-inflammatory action of this bacterium.