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. 2019 Feb 21;11(2):448.
doi: 10.3390/nu11020448.

In Vitro Antimicrobial Activity and Probiotic Potential of Bifidobacterium and Lactobacillus against Species of Clostridium

Affiliations

In Vitro Antimicrobial Activity and Probiotic Potential of Bifidobacterium and Lactobacillus against Species of Clostridium

Cinara R A V Monteiro et al. Nutrients. .

Abstract

Many Clostridium species are found as commensal members of the intestinal microbiota. However, imbalances of the microbiota may lead to certain infections caused by these microorganisms, mainly Clostridium butyricum, Clostridium difficile, and Clostridium perfringens. In many cases, infection recurrence can occur after antibiotics, indicating the need for novel therapeutic options that act on the pathogens and also restore the microbiota. Herein, the in vitro antimicrobial activity and probiotic potential of clinical and reference strains of Bifidobacterium and Lactobacillus were investigated against Clostridium species. Antimicrobial activity was evaluated by the agar spot test and inhibition of gas production. Then, the probiotic potential of selected strains was assessed by analyzing their coaggregation ability, adhesive properties to host cells and mucin, tolerance to acidic pH and bile salts, and antimicrobial susceptibility profiles. Lactobacillus plantarum ATCC 8014 was the most promising strain based on its inhibitory activity against Clostridium spp. Also, this strain met criteria to be considered a probiotic based on its coaggregation ability, adhesive properties, and tolerance to harsh pH and bile acid salt conditions. The results indicate that among the studied strains, L. plantarum ATCC 8014 presents probiotic potential for controlling infections induced by the studied Clostridium species and should be further evaluated in in vivo animal models.

Keywords: Clostridium; Lactobacillus plantarum; antimicrobial activity; dysbiosis; probiotics.

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Conflict of interest statement

The authors declare no conflict of interest. The funders had no role in the design of the study, in the collection, analyses, or interpretation of data, in the writing of the manuscript, or in the decision to publish the results.

Figures

Figure 1
Figure 1
Inhibition of gas production assay. The lower layer corresponds to the RCM agar inoculated with Clostridium butyricum ATCC 860 and the upper layer is MRS medium with 0.7% agar and 100 mM phosphate buffer inoculated with Bifidobacterium and Lactobacillus strains; cultures were incubated at 37 °C for 24 h under anaerobic conditions. (a) Gas production by C. butyricum in buffered MRS medium, indicating the absence of inhibitory activity of Lactobacillus and Bifidobacterium strains. (b) Inhibitory activity of five Lactobacillus and two Bifidobacterium strains on gas production by Clostridium butyricum.
Figure 2
Figure 2
Gram staining of bacterial isolates before (ad) and after (eg) the coaggregation assays of L. plantarum ATCC 8014 with the three species of Clostridium. (a) L. plantarum, (b) C. butyricum, (c) C. difficile, and (d) C. perfringens controls. Coaggregation of L. plantarum and (e) C. butyricum, (f) C. difficile, or (g) C. perfringens. Formation of bacterial aggregates were observed after mixing L. plantarum with each Clostridium strain. Gram stained slides were visualized by light microscopy under a 100× oil immersion objective.
Figure 3
Figure 3
Microscopic visualization of adhesion assays of (a) L. plantarum ATCC 8014 and (b) L. fermentum ATCC 23271 to HeLa cells after inoculation of approximately 107 CFU of bacterial suspensions. Cell monolayers grown on coverslips were stained by the Gram’s method and examined by light microscopy under a 100× oil immersion objective. Note the presence of numerous gram-positive bacilli adhered to HeLa cells.

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