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In vitro validation studies for adhesion factor and adhesion efficiency of probiotic Bacillus licheniformis MCC 2514 and Bifidobacterium breve NCIM 5671 on HT-29 cell lines

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Abstract

Probiotic bacterial adhesion to the epithelial cell is a composite process and in vivo adhesion studies can be strengthened with the improved in vitro models for preliminary screening of potentially adherent strains. With this rationale, the study aimed is the first report to demonstrate the colonizing efficiency of probiotic Bacillus licheniformis MCC 2514 in comparison to Bifidobacterium breve NCIM 5671on HT-29 cell line. B. licheniformis (54.28 ± 0.99%) and Bif. breve (70.23 ± 0.85%) adhered in a higher percentage on fibronectin and mucin, respectively. However, the adhesion was higher for B. licheniformis when compared to Bif. breve. In adhesion score, B. licheniformis obtained about 138.85 ± 12.32, whereas Bif. breve got the score of 43.05 ± 9.12. The same trend continued in the adhesion percentage study, where B. licheniformis adhered 75.5 ± 5.2%, higher than Bif. breve which adhered 32.66 ± 3.2%. In invasion assay, both the bacteria significantly decreased the colonization of the pathogen Kocuria rhizophila ATCC 9341 about 97.32 ± 0.81% in the competitive assay, 97.87 ± 0.73% in exclusion assay and 82.19 ± 2.51% in displacement assay. The cytotoxicity effects of the test bacterial strains against HT-29 cell line through MTT assay determined no viability loss in the treated cells. Therefore, the data obtained from the in vitro studies showed that both B. licheniformis and Bif. breve had shown significantly good invasion on pathogen and adhesion capacity on HT-29 cell line.

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Acknowledgements

The authors would like to thank the Director, CSIR-CFTRI, for the continuous support. The authors acknowledge the work carried under DST funded project (sanction no. EEQ/2016/000310), Department of Science and Technology, New Delhi, and RHS acknowledge the grant of ICMR- senior research fellowship, ICMR, New Delhi for the financial support.

Funding

The research work carried under DST funded project (sanction no. EEQ/2016/000310), Department of Science and Technology, New Delhi.

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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by HSR. HSR wrote the first draft of the manuscript and PMH commented on previous versions of the manuscript. HSR and PMH read and approved the final manuscript.

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Correspondence to Prakash Motiram Halami.

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Communicated by Erko Stackebrandt.

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Rohith, H.S., Halami, P.M. In vitro validation studies for adhesion factor and adhesion efficiency of probiotic Bacillus licheniformis MCC 2514 and Bifidobacterium breve NCIM 5671 on HT-29 cell lines. Arch Microbiol 203, 2989–2998 (2021). https://doi.org/10.1007/s00203-021-02257-y

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  • DOI: https://doi.org/10.1007/s00203-021-02257-y

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