Antimicrobial resistance has been considered one of the biggest threats to human health globally (Sulis et al. 2022). According to a recent report published in 2022, 4.95 million deaths were associated with antimicrobial resistance in 2019, including 1.27 million deaths directly attributable to antimicrobial resistance (Murray et al. 2022). To make matters worse, resistance to carbapenem, the preferred last resort drug for treating multidrug-resistant bacterial infections was first reported in
Meanwhile,
According to the Food and Agriculture Organization (FAO)/ World Health Organization (WHO), probiotics are ‘live microorganisms which, when administered in adequate amounts, confer a health benefit on the host’ (FAO/WHO 2001). As reported by many studies, probiotics have many functions, including providing nutrients, modifying biological activities, preventing pathogenic microorganisms, boosting immune responses, and enhancing growth (Oelschlaeger 2010). Some reports have shown the effects of probiotics against different diseases, such as necrotizing enterocolitis (Patel and Underwood 2018), acute infectious diarrhea (Allen et al. 2010), antibiotic-associated diarrhea (Kopacz and Phadtare 2022), metabolic disorders (Li et al. 2021a), and autoimmune diseases (De Luca and Shoenfeld 2019). Furthermore, probiotics could play an essential role in acute infectious diseases, namely: tuberculosis (Rahim et al. 2022), acquired immunodeficiency syndrome (AIDS) (Ceccarelli et al. 2019),
We examined the preventive effect of our candidate probiotic strain,
We investigated the therapeutic potential of our candidate probiotic strain,
Identification of isolated bacterial strain based on 16S rRNA gene sequence analysis.
NCBI references | Organisms | Length | Score | Identities | Gaps |
---|---|---|---|---|---|
NR_075005.2 | 1,550 | 2,728 bits (1,477) | 1,492/1,499 (99%) | 2/1,499 (0%) | |
NR_116240.1 | 1,445 | 2,615 bits (1,416) | 1,427/1,432 (99%) | 2/1,432 (0%) | |
NR_112685.1 | 1,475 | 2,699 bits (1,461) | 1,470/1,475 (99%) | 0/1,475 (0%) | |
NR_041455.1 | 1,472 | 2,697 bits (1,460) | 1,468/1,472 (99%) | 0/1,472 (0%) | |
NR_102783.2 | 1,550 | 2712 bits (1,468) | 1,489/1,499 (99%) | 2/1,499 (0%) | |
NR_118996.1 | 1,545 | 2,579 bits (1,396) | 1,466/1,500 (98%) | 4/1,500 (0%) | |
NR_116023.1 | 1,468 | 2,545 bits (1,378) | 1,439/1,469 (98%) | 2/1,469 (0%) |
The ability of the candidate probiotic strain to dehydrate carbon sources.
No. | Type of test | Candidate strain | |||||||
---|---|---|---|---|---|---|---|---|---|
24 h | 48 h | 24 h | 48 h | 24 h | 48 h | 24 h | 48 h | ||
0 | Control | - | - | - | - | - | - | - | - |
1 | Glycerol | + | + | + | + | + | - | + | + |
2 | Erythritol | - | - | - | - | - | - | - | - |
3 | D-arabinose | - | - | - | - | - | - | - | - |
4 | L-arabinose | - | + | + | + | + | + | - | + |
5 | D-ribose | + | + | + | + | + | + | + | + |
6 | D-xylose | - | + | + | + | + | + | - | - |
7 | L-xylose | - | - | - | - | - | - | - | - |
8 | D-adonite | - | - | - | - | - | - | - | - |
9 | Methyl-pD-xylopyranoside | - | - | - | - | - | - | - | - |
10 | D-galactose | + | + | + | + | - | - | - | - |
11 | D-glucose | + | + | + | + | + | - | + | - |
12 | D-fructose | + | + | + | + | + | - | + | - |
13 | D-mannose | + | + | + | + | + | - | + | - |
14 | L-sorbose | - | - | - | + | - | - | - | - |
15 | L-rhamnose | + | + | + | + | - | - | - | - |
16 | Dulcitol | - | - | - | - | - | - | - | - |
17 | Inocitol | + | + | + | + | + | + | - | - |
18 | D-mannitol | + | + | + | + | + | - | + | - |
19 | D-sorbito | + | + | + | + | + | - | + | + |
20 | Methyl-aD-mannopyranoside | - | - | - | - | - | - | - | - |
21 | Methyl-aD-glucopyranoside | - | + | + | + | + | + | + | + |
22 | N-acetylglucosamine | + | + | - | - | + | - | + | - |
23 | Amygdaline | + | + | + | + | - | + | + | - |
24 | Arbutine | + | + | + | + | + | - | + | - |
25 | Esculine | + | + | + | + | + | + | + | + |
26 | Salicin | + | + | + | - | + | + | + | - |
27 | D-Cellibiose | + | + | + | + | + | + | + | + |
28 | D-Maltose | + | + | + | + | + | + | + | + |
29 | D-Lactose | + | + | - | - | + | + | + | + |
30 | D-Melibiose | - | + | - | + | + | + | - | + |
31 | D-Sacharose | + | + | + | - | + | + | + | - |
32 | D-Trehalose | + | + | + | + | + | + | - | - |
33 | Inulin | - | - | - | + | - | - | - | - |
34 | D-Melezitose | + | - | - | - | - | - | - | - |
35 | D-Raffinose | + | + | + | + | + | + | + | + |
36 | Amidon | + | + | + | - | + | - | + | - |
37 | Glycogen | - | + | + | - | + | - | + | - |
38 | Xylitol | - | - | - | - | - | - | - | - |
39 | Gentibiose | + | - | - | - | - | - | + | - |
40 | D-Turanose | - | - | + | + | - | - | + | + |
41 | D-Lyxose | - | - | - | - | - | - | - | - |
42 | D-Tagatose | + | + | + | - | - | - | - | - |
42 | D-Fucose | - | - | - | - | - | - | - | - |
44 | L-Fucose | - | - | - | - | - | - | - | - |
45 | D-arabitol | - | - | - | - | - | - | - | - |
46 | L-arabitol | - | - | - | - | - | - | - | - |
47 | Potassium gluconate | + | - | - | - | - | - | - | - |
48 | Potassium 2 ketogluconate | - | - | - | - | - | - | - | - |
49 | Potassium 5 ketogluconate | - | - | - | - | - | - | - | - |
(+) - positive reaction (yellow) (No. 25: black); (-) - negative reaction (red)
Identification of the isolated bacterial strain by qRT-PCR.
Species-specific primer for- | Oligo name | Amplification results | ||||
---|---|---|---|---|---|---|
Candidate probiotic strain | ||||||
Bvel | + | + | - | - | - | |
YtcP | - | - | - | + | - | |
spBamyphes | + | + | + | - | - | |
Blich | - | - | - | - | + | |
Macrolactin | Min | + | + | - | - | - |
(+) - amplification, (-) - no amplification
Evaluation of the preventive effect of
Evaluation of the therapeutic effect of B.
Acute oral dose toxicity of
CRKP strains are causing a significant public health concern across the globe because of their capacity to spread quickly in the hospital setting with a high mortality rate and their extensive antimicrobial resistance characteristics (Brink 2019). Currently, infections with CRE have a limited number of therapeutic options, which have been utilized rarely due to concerns about their effectiveness and toxicity (Morrill etal. 2015). Therefore, new anti-CRE drug agents that differ from existing drug regimens are desperately needed. Under such circumstances, probiotics can be a potential option as their effectiveness against different infectious diseases has already been well established.
Several human studies have recently reported the effectiveness of probiotics for various gut-related diseases, such as necrotizing enterocolitis and antibioticassociated diarrhea (Cremonini et al. 2002; AlFaleh andAnabrees 2014). Besides, probiotics can help maintain intestinal barrier integrity (Hemert et al. 2013). Moreover, probiotic administration can protect and enhance the gut microbiota of mice by improving the number of beneficial bacteria while decreasing the number of pathogenic bacteria (Li et al. 2019). With this background, our research team is interested in using probiotics to counter the threat to human health caused by CRE infections.
Our research team isolated various probiotic strains, such as
The strain discovered in the vinegar was confirmed as
Probiotics are classified as Generally Regarded as Safe (GRAS) by the United States Food and Drug Administration (FDA) (Martin and Langella 2019). Probiotics have been used for a long time, and their safety has been established. These findings allow their usage as food or supplements from a scientific perspective (Martin and Langella 2019). Although probiotics are commonly considered safe (Williams 2010), some strains can cause bacteremia and septicemia (Kulkarni 2019). In consideration of these safety issues, a repeated two-week oral acute toxicity test was performed using guinea pigs. No abnormal clinical symptoms, weight loss, or animal death were observed during the experiment period.
Concerning safety, this study used probiotic strains cultured in FGM. FGM is one medium allowed to come into direct contact with foods, and it does not cause any hazards or change the taste and flavor, making it suitable for human consumption (Sawatari et al. 2006). Besides, FGM is less expensive and easier for bulk production; therefore, many
Many studies have found that the gastrointestinal tract's stability and beneficial bacterial population enhance the host's immune system and antioxidant capacity and prevent the spread of pathogenic bacteria in the gut (Khalid et al. 2021; Li et al. 2019). Moreover, according to a report, the probiotic strain
In summary, in this study, a new probiotic strain, the
Financial support for this study was provided by a grant (No. 2021040D288) from the Gochang Bokbunja vinegar Research Project through the Gochang Agricultural Technology Center, funded by Gochang County, Republic of Korea. This work was also supported by the Technology Innovation Program (20018499), funded By the Ministry of Trade, Industry & Energy (MOTIE, Korea). This research was also supported by the Soonchunhyang University Research Fund. Moreover, we would like to thank the officials of Gochanggun, the vinegar farmers in the Gochang area,