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Assessment of the probiotic potential of lactic acid bacteria isolated from kefir grains: evaluation of adhesion and antiproliferative properties in in vitro experimental systems

  • Ioanna Mantzourani
  • Pelagia Chondrou
  • Christos Bontsidis
  • Kyriaki Karolidou
  • Antonia Terpou
  • Athanasios Alexopoulos
  • Eugenia Bezirtzoglou
  • Alex Galanis
  • Stavros PlessasEmail author
Original Article
  • 33 Downloads

Abstract

The main objective of this study was to isolate lactic acid bacteria from kefir grains and investigate their probiotic potential. In this study, 48 bacterial strains were isolated from kefir grains, whereas 39 strains were categorized to the genus Lactobacillus. Evaluation of the probiotic potential of the isolated stains was performed, including resistance to low pH, tolerance to pepsin, pancreatin and bile salts, and antibiotic resistance. In addition, evaluation of adhesion and antiproliferative properties in in vitro experimental systems was also conducted. Strains SP2 and SP5 that displayed the best performance in the conducted in vitro tests were selected for further studies. Firstly, genotypic identification of the two strains was performed by partial 16S rRNA gene sequencing, BLAST analysis, and species-specific multiplex PCR assay. The two strains were confirmed to be Pediococcus pentosaceus SP2 and Lactobacillus paracasei SP5. Then, the adhesion properties of the two strains were examined in vitro. Both strains displayed substantial adherence capacity to HT-29 human colon cancer cells. Moreover, a significant decrease of HT-29 cell growth after treatment with viable P. pentosaceus SP2 or L. paracasei SP5 was recorded. In addition, downregulation of anti-apoptotic genes and over-expression of cell cycle–related genes was recorded by real-time PCR analysis. Treatment with conditioned media of the two strains also caused significant reduction of cancer cell proliferation in a time- and concentration-dependent manner. P. pentosaceus SP2 and L. paracasei SP5 displayed the best probiotic properties that exerted substantial adherence on human colon cancer cells as well as significant anti-proliferative properties.

Keywords

Probiotics Lactobacillus Kefir Adhesion Anti-proliferation Colon 

Notes

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflicts of interest.

Supplementary material

13213_2019_1467_MOESM1_ESM.pptx (507 kb)
Fig S1 Phylogenetic trees based on 16S rRNA gene sequence of Lactobacillus SP2 and Lactobacillus SP5. The partial sequence of the 16S rRNA gene of Lactobacillus SP2 (A) or Lactobacillus SP5 (B) was searched for similarities in GenBank using the BLAST program. The closely related sequences were retrieved, aligned with the Clustal X program and applied for the construction of a phylogenetic tree with the MEGA 6 software, using the neighbor-joining method. The numbers indicate bootstrap values for the branch points. The bar shows the length of branch that represents an amount of 0.005 genetic change. (PPTX 507 kb)
13213_2019_1467_MOESM2_ESM.docx (16 kb)
Supplementary Table S1 (DOCX 15.9 kb)

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Copyright information

© Università degli studi di Milano 2019

Authors and Affiliations

  • Ioanna Mantzourani
    • 1
  • Pelagia Chondrou
    • 2
  • Christos Bontsidis
    • 1
  • Kyriaki Karolidou
    • 2
  • Antonia Terpou
    • 3
  • Athanasios Alexopoulos
    • 1
  • Eugenia Bezirtzoglou
    • 1
  • Alex Galanis
    • 2
  • Stavros Plessas
    • 1
    Email author
  1. 1.Laboratory of Microbiology, Biotechnology and Hygiene, Faculty of Agricultural DevelopmentDemocritus University of ThraceOrestiadaGreece
  2. 2.Department of Molecular Biology and GeneticsDemocritus University of ThraceAlexandroupolisGreece
  3. 3.Food Biotechnology Group, Section of Analytical Environmental and Applied Chemistry, Department of ChemistryUniversity of PatrasPatrasGreece

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