• 한국축산식품학회지
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• 제43권4호
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• pp.685-702
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• 2023

Lactic acid bacteria (LAB) are commonly used as probiotics; however, not all LAB strains have the same beneficial effects. To successfully use LAB as probiotics in canines, LAB species should originate from the canine intestinal tract as they display host specificity. The objective of this study was to investigate the phenotypic and genomic traits of potential probiotic LAB isolated from canine fecal samples. Twenty LAB samples were evaluated for their potential probiotic characteristics including resistance to low pH, bile salts, hydrophobicity, auto-aggregation, co-aggregation, adhesion to epithelia or mucosa, and production of inhibitory compounds. Additionally, we evaluated their safety and other beneficial effects on canine health, such as DPPH free radical scavenging, and β-galactosidase. Four strains demonstrated potential probiotic characteristics and were selected: Enterococcus hirae Pom4, Limosilactobacillus fermentum Pom5, Pediococcus pentosaceus Chi8, and Ligilactobacillus animalis FB2. Safety evaluations showed that all strains lacked hemolytic activity, could not produce biogenic amines, and did not carry any pathogenic genes. In addition, L. fermentum Pom5 and P. pentosaceus Chi8 displayed susceptibility to all antibiotics and concordant with the absence of antibiotic resistance genes. Based on their phenotypic and genomic characteristics, L. fermentum Pom5 and P. pentosaceus Chi8 were identified as potential probiotic candidates for canines.

• Journal of Microbiology and Biotechnology
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• 제16권4호
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• pp.531-537
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• 2006

Lactic acid-producing bacteria (LABs) are known to have various beneficial properties for health. However, they are generally considered to have an adverse effect on teeth, since they produce acid. Nonetheless, milk and cheese containing specific LAB strains were recently found to have an inhibitory effect on dental caries in children, with an inhibitory activity towards the growth of Streptococcus mutans suggested as the responsible mechanism. Accordingly, the current study selected a probiotic candidate for oral health and studied its inhibitory mechanism against dental caries. Twenty-two LAB species belonging to eleven genuses were screened for promoting bone nodule formation using direct microscopic examination. Only one isolate, Weissella kimchii strain PL9001, increased the bone nodule formation significantly. The addition of W. kimchii strain PL9001 to bone cells prepared from mouse calvaria increased the bone nodule formation, calcium accumulation, and activity of alkaline phosphatase (the osteoblastic marker). Moreover, W. kimchii strain PL9001 inhibited the invasion of Streptococcus mutans into bone cells, and an organic extract of the culture supernatant of W. kimchii strain PL9001 inhibited the growth of Strep. mutans. Therefore, the results suggest that W. kimchii strain PL9001 can be used as a preventive measure against dental caries. This is the first time that a LAB has been shown to promote bone nodule formation and prevent the invasion of Strep. mutans into bone cells.

• Journal of Microbiology and Biotechnology
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• 제29권8호
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• pp.1248-1254
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• 2019

Identification of novel probiotic strains is of great interest in the field of functional foods. Specific strains of heat-killed bacteria have been reported to exert immunomodulatory effects. Herein, we investigated the immune-stimulatory function of heat-killed Lactobacillus plantarum KCTC 13314BP (LBP). Treatment with LBP significantly increased the production of $TNF-{\alpha}$ and IL-6 by macrophages. More importantly, LBP was able to enhance the phagocytic activity of macrophages against bacterial particles. Activation of p38, JNK, ERK, $NF-{\kappa}B$, and STAT3 was involved in the immunomodulatory function of LBP. LBP treatment significantly increased production of $TNF-{\alpha}$ by bone marrow-derived macrophages and splenocytes, further confirming the immunostimulatory effect of LBP in primary immune cells. Interestingly, the immunomodulatory effects of LBP were much stronger than those of Lactobacillus rhamnosus GG, a well-known probiotic strain. These results indicate that LBP can be a promising immune-enhancing functional food agent.

• 한국축산식품학회:학술대회논문집
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• 한국축산식품학회 2004년도 정기총회 및 제33차 춘계 학술대회
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• pp.349-352
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• 2004

Twelve strains of Lactobacillus acidophilus isolated from feces of human or animal sources were tested for probiotic properties such as cholesterol assimilation, bile and acid tolerances, and CLA production. Although the cultures showed some variation with respect to each test, the 12 strains could be classified into 3 groups based on their ability to assimilate cholesterol. The cholesterol assimilation showed positive correlation with bile tolerance and negative correlation with acid tolerance. The cholesterol assimilation of L. acidophilus strains may not be related to the deconjugation activity, but may in fact be attributed to its bile tolerance. CLA production by lactic acid bacteria (LAB) exhibited a wide variation that ranged from 2.69 to 7.64 mg/g fat. CLA production of Bifidobacterium longum ATCC 15707 was the highest among the LAB tested, but there was no evidence for differences in CLA production between genus and species.

• Journal of Animal Science and Technology
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• 제63권3호
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• pp.666-670
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• 2021

Paenibacillus konkukensis sp. nov., SK3146 is a novel strain isolated from a pig feed. Here, we present complete genome sequence of SK3146. The genome consists of a single circular genome measuring 7,968,964 bp in size with an average guanine + cytosine (G+C) content of 53.4%. Genomic annotation revealed that the strain encodes 151 proteins related to hydrolases (EC3), which was higher than those in Bacillus subtilis and Escherichia coli. Diverse kinds of hydrolases including galactosidase, glucosidase, cellulase, lipase, xylanase, and protease were found in the genome of SK3146, coupled with one bacteriocin encoding gene. The complete genome sequence of P. konkukensis SK3146 indicates the immense probiotic potential of the strain with nutrient digestibility and antimicrobial activity functions.

• 생명과학회지
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• 제22권9호
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• pp.1194-1200
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• 2012

유산균은 일반적으로 프로바이오틱스 균주로 알려져 있다. 가능성이 있는 프로바이오틱스 균주는 세포결합과 부착능 즉, 장상피세포 부착능 및 세포표면의 소수성이 기초적으로 구비되어야 한다. 본 연구에서는 김치로부터 몇몇의 토착 유산균을 분리하였으며, 세포표면 소수성에 근거한 가능성이 있는 프로바이오틱스로서 유산균 한종을 선발하였다. 프로바이오틱스균주로서 선별한 분리균주(BCNU 9070)의 16S 리보좀DNA 염기서열을 분석한 결과 Pediococcus pentosaceus에 속하는 균주임이 확인되었다. P. pentosaceus BCNU 9070 균주는 위액과 담즙산에 대하여 내성을 가졌으며 또한 Listeria monocytogenes 및 Shigella sonnei를 포함하는 6종의 식중독 병원균에 대하여 생육저해활성도 나타내었다. 게다가 P. pentosaceus BCNU 9070 균주는 담즙산 가수분해활성 및 콜레스테롤 동화능도 있음이 확인되었다. 이들 결과를 기초로, P. pentosaceus BCNU 9070은 기능성 식품에 적용가능한 천연 프로바이오틱스 특성을 가지고 있다고 판단된다.

• Journal of Microbiology and Biotechnology
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• 제29권12호
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• pp.1904-1915
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• 2019

Resistant starch (RS) is metabolized by gut microbiota and involved in the production of short-chain fatty acids, which are related to a variety of physiological and health effects. Therefore, the availability of RS as a prebiotic is a topic of interest, and research on gut bacteria that can decompose RS is also important. The objectives in this study were 1) to isolate a human gut bacterium having strong degradation activity on non-gelatinized RS, 2) to characterize its RS-degrading characteristics, and 3) to investigate its probiotic effects, including a growth stimulation effect on other gut bacteria and an immunomodulatory effect. Bifidobacterium adolescentis P2P3 showing very strong RS granule utilization activity was isolated. It can attach to RS granules and form them into clusters. It also utilizes high-amylose corn starch granules up to 63.3%, and efficiently decomposes other various types of commercial RS without gelatinization. In a coculture experiment, Bacteroides thetaiotaomicron ATCC 29148, isolated from human feces, was able to grow using carbon sources generated from RS granules by B. adolescentis P2P3. In addition, B. adolescentis P2P3 demonstrated the ability to stimulate secretion of Th1 type cytokines from mouse macrophages in vitro that was not shown in other B. adolescentis. These results suggested that B. adolescentis P2P3 is a useful probiotic candidate, having immunomodulatory activity as well as the ability to feed other gut bacteria using RS as a prebiotic.

• 한국축산식품학회지
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• 제26권4호
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• pp.511-516
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• 2006

발효 소시지의 제조에 starter로 사용한 균주를 선발하기 위해 각 유산균 균주들의 ACE 저해 활성, 콜레스테롤 흡착능력, 발효 육제품 저장 중 S. aureus에 대한 저해 황성을 평가하였다. ACE 저해 활성은 L. plantarum L167이 가장 우수하였고(58.75%), 콜레스테롤 흡착 능력이 우수한 균주로는 L. plantarum L155를 선발하였다. 박테리오신을 생산하는 P. damnosus를 starter로 이용하여 제조한 발효 소시지에 S. aureus를 접종하여 상온 저장 중 생균수를 측정한 결과 저장 35일째에 대조구에 비하여 1 log의 균수 감소 효과가 나타났다.

• 생명과학회지
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• 제22권5호
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• pp.605-612
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• 2012

포자형성균은 사람과 동물용의 프로바이오틱 제제로서 사용되어져 왔다. 포자형성균의 낮은 pH에 대한 안정성과 위내 생육저해 환경에 생존능은 프로바이오틱 제제로서 매력적이다. 본 연구는, 한국 전통 대두 발효 식품의 종균인 BCNU 9028균주를 메주로부터 분리하였다. 생리학적, 생화학적 특성과 16S 리보좀 DNA 염기서열 분석 결과 BCNU 9028균주는 $Bacillus$에 속하는 것을 확인하였다. $Bacillus$ sp. BCNU 9028은 pH 2.5에서 92%의 생존률을 보였으며, 0.3% 담즙산에서도 저항성을 나타냈다. 그리고, 식품 병원성균과의 응집정도와 자가결합능에 의해 $Bacillus$ sp. BCNU 9028는 $Listeria$ $monocytogenes$, $S.$ $aureus$ 및 $E.$ $coli$와 같은 식품 병원성균의 생물막형성과 부착을 저해할 수 있는 것을 확인하였다. BCNU 9028의 소수성 특성(63.3%)은 장관내 부착능이 우수할 것으로 나타났다. 특히, $Bacillus$ sp. BCNU 9028 균주는 그람양성 및 그람음성 병원성균 모두에 항균력을 갖는 것을 확인하였다. 이상의 결과로 $Bacillus$ sp. BCNU 9028균주가 프로바이오틱스로서 이용가능성이 있음을 제시하였다.

• 생명과학회지
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• 제29권6호
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• pp.697-704
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• 2019

본 연구에서는 전통발효식품에서 분리한 유산균 200여종에 대하여 프로바이오틱 특성을 확인하였다. 내담즙성 및 내산성이 높게 측정된 유산균 4종을 선발하였다. 선발된 유산균은 Lb. plantarum SRCM102224, Lb. plantarum SRCM102227, Lb. paracasei SRCM102329, Lb. paracasei SRCM102343이다. 항균활성, 내산성, 내담즙성, 용혈성, 세포표면 소수성, 장내 세포 부착성, 항생제 내성을 조사하였다. 선발된 유산균 4종 중 SRCM102343은 세포표면 소수성이 95.9%로 대조구 Lb. rhamnosus GG는 13.4%보다 높게 측정되었다. 4종의 유산균의 장내상피세포 caco-2에 대한 부착능을 조사하였다. 그 결과, SRCM102343와 SRCM102329의 Lb. rhamnosus GG보다 부착율이 높았다. 선발된 유산균 4종에 대하여 항균활성 조사 결과, 그 중 3종이 Escherichia coli ATCC 10798, Staphylococcus aureus KCCM 11593, Listeria invanovii KCTC3444, Bacillus cereus ATCC11778 및 S. enterica serovar. Typhi KCTC1926에 대하여 항균활성이 뛰어났다. 이들 결과를 바탕으로 선발된 균주는 프로바이오틱의 가능성으로 기능성식품에 활용이 기대된다.