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Volume 12
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10.3390/microorganisms12040840
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Article

Investigation of Effects of Novel Bifidobacterium longum ssp. longum on Gastrointestinal Microbiota and Blood Serum Parameters in a Conventional Mouse Model

by
Merle Rätsep
1,
Kalle Kilk
2,
Mihkel Zilmer
2,
Sirje Kuusik
1,
Liina Kuus
1,
Mirjam Vallas
1,
Oksana Gerulis
1,
Jelena Štšepetova
3,
Aivar Orav
4 and
Epp Songisepp
1,*
1
BioCC OÜ, Riia St. 181A, 50411 Tartu, Estonia
2
Department of Biochemistry, Institute of Biomedicine and Translational Medicine, University of Tartu, Ravila St. 19, 50411 Tartu, Estonia
3
Department of Microbiology, Institute of Biomedicine and Translational Medicine, University of Tartu, Ravila St. 19, 50411 Tartu, Estonia
4
Tartu Health Care College, Nooruse St. 5, 50411 Tartu, Estonia
*
Author to whom correspondence should be addressed.
Microorganisms 2024, 12(4), 840; https://doi.org/10.3390/microorganisms12040840
Submission received: 6 March 2024 / Revised: 16 April 2024 / Accepted: 17 April 2024 / Published: 22 April 2024
(This article belongs to the Special Issue Probiotics, Prebiotics, and Gut Microbes)
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Abstract

Representatives of the genus Bifidobacterium are widely used as probiotics to modulate the gut microbiome and alleviate various health conditions. The action mechanisms of probiotics rely on their direct effect on the gut microbiota and the local and systemic effect of its metabolites. The main purpose of this animal experiment was to assess the biosafety of the Bifidobacterium longum strain BIOCC1719. Additional aims were to characterise the influence of the strain on the intestinal microbiota and the effect on several health parameters of the host during 15- and 30-day oral administration of the strain to mice. The strain altered the gut microbial community, thereby altering luminal short-chain fatty acid metabolism, resulting in a shift in the proportions of acetic, butyric, and propionic acids in the faeces and serum of the test group mice. Targeted metabolic profiling of serum revealed the possible ability of the strain to positively affect the hosts’ amino acids and bile acids metabolism, as the cholic acid, deoxycholic acid, aspartate, and glutamate concentration were significantly higher in the test group. The tendency to increase anti-inflammatory polyamines (spermidine, putrescine) and neuroprotective 3-indolepropionic acid metabolism and to lower uremic toxins (P-cresol-SO4, indoxyl-SO4) was registered. Thus, B. longum BIOCC1719 may exert health-promoting effects on the host through modulation of the gut microbiome and the host metabolome via inducing the production of health-promoting bioactive compounds. The health effects of the strain need to be confirmed in clinical trials with human volunteers.
Keywords: Bifidobacterium longum; mouse model; probiotic; microbiota; metabolomics; health parameters Bifidobacterium longum; mouse model; probiotic; microbiota; metabolomics; health parameters

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MDPI and ACS Style

Rätsep, M.; Kilk, K.; Zilmer, M.; Kuusik, S.; Kuus, L.; Vallas, M.; Gerulis, O.; Štšepetova, J.; Orav, A.; Songisepp, E. Investigation of Effects of Novel Bifidobacterium longum ssp. longum on Gastrointestinal Microbiota and Blood Serum Parameters in a Conventional Mouse Model. Microorganisms 2024, 12, 840. https://doi.org/10.3390/microorganisms12040840

AMA Style

Rätsep M, Kilk K, Zilmer M, Kuusik S, Kuus L, Vallas M, Gerulis O, Štšepetova J, Orav A, Songisepp E. Investigation of Effects of Novel Bifidobacterium longum ssp. longum on Gastrointestinal Microbiota and Blood Serum Parameters in a Conventional Mouse Model. Microorganisms. 2024; 12(4):840. https://doi.org/10.3390/microorganisms12040840

Chicago/Turabian Style

Rätsep, Merle, Kalle Kilk, Mihkel Zilmer, Sirje Kuusik, Liina Kuus, Mirjam Vallas, Oksana Gerulis, Jelena Štšepetova, Aivar Orav, and Epp Songisepp. 2024. "Investigation of Effects of Novel Bifidobacterium longum ssp. longum on Gastrointestinal Microbiota and Blood Serum Parameters in a Conventional Mouse Model" Microorganisms 12, no. 4: 840. https://doi.org/10.3390/microorganisms12040840

APA Style

Rätsep, M., Kilk, K., Zilmer, M., Kuusik, S., Kuus, L., Vallas, M., Gerulis, O., Štšepetova, J., Orav, A., & Songisepp, E. (2024). Investigation of Effects of Novel Bifidobacterium longum ssp. longum on Gastrointestinal Microbiota and Blood Serum Parameters in a Conventional Mouse Model. Microorganisms, 12(4), 840. https://doi.org/10.3390/microorganisms12040840

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