• 한국식품과학회지
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• 제44권5호
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• pp.638-642
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• 2012

돼지축사에서 채집해온 6개의 육성돈의 분변에서 식중독 유발 바이러스인 HAV와 HEV를 검출하였으며, HAV는 88.3%의 검출율을 보였으며, HEV는 33.3%의 검출율을 보였다. 결과에는 제시하지 않았으나, 염기서열 분석결과 HEV는 사람에게 전염이 가능한 유전자형인 III형이었으며, 실험적으로 사람의 간세포인 PLC/PRF/5에 접종하였을 때 증식이 됨을 확인하였다. 식중독 유발 바이러스인 HAV와 HEV는 오염된 식품이나 물을 섭취하거나 교차 오염에 의해 전염이 가능하기 때문에 돼지축사에서 위생상태의 개선뿐만 아니라 육류를 섭취하기 전인 운송 및 가공과정까지 식중독 유발 바이러스에 의한 교차오염을 막는 노력이 필요하다. HAV와 HEV 모두 검출된 분변에서 HAV를 순수분리하고 빠르게 검출하기 위해 IMS-RT-PCR을 적용하였으며, 항원-항체 반응에 의해 순수하게 HAV만을 분리할 수 있었다. 또한 HAV만이 순수분리 되었는지 재확인하기위해 세포감염을 통해 증식된 바이러스를 확보한 후 nested RT-PCR을 수행한 결과, HAV만을 순수 분리할 수 있음을 확인하였다. 이는 IMS 활용기술이 단순히 항체를 교체함으로써 다른 특정 식중독 유발 바이러스의 다양한 시료에서 바이러스 순수분리 및 검출에 활용 가능성이 있음을 확인하였다.

• Parasites, Hosts and Diseases
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• 제48권1호
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• pp.9-13
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• 2010

Pentatrichomonas hominis is considered a commensal protozoan in the large intestine of a number of mammalian hosts, such as cats, dogs, and non-human primates. The resulting infections, which can induce diarrhea, have been attributed to opportunistic overgrowth of P. hominis. This study was performed to confirm the P. hominis infection and its molecular characterization from the feces of puppies with diarrhea. Fecal samples were obtained from 14 German shepherd puppies with diarrhea over 1 week (7 females and 7 males, 2-9 months of age) residing on a dog farm in August 2007. Species-specific PCR assay identified P. hominis 18S rRNA genes in 3 of the 14 puppies (1 female and 2 males; 1 aged 2 months and 2 aged 9 months). This phylogenetic analysis established that P. hominis belonged to the 1st clade, which is comprised of Bos taurus and Felines.

• 한국임상수의학회지
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• 제28권2호
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• pp.254-257
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• 2011

2년령 bearded dragon이 활력 감소 및 식욕 부진으로 충북대학교 동물의료센터에 내원하였다. 분변 검사 결과 다수의 세균과 함께 효모의 증식이 관찰되어 장염으로 진단되었다. 진균 배양 및 분자생물학적 진균 동정 결과 증식된 효모는 Pichia (P.) burtonii로 확인되었다. 치료는 ketoconazole과 trimethoprim/sulfamethoxazole을 3일간 경구 투여하였다. 치료 3일 후 분변 내 효모는 사라졌으며, 이후 환자는 회복되었다. 본 증례와 사람에서의 보고를 종합하면 P. burtonii 는 장염이 있는 bearded dragon의 기회성 병원체로 추정된다. 또한 본 증례는 bearded dragon에서의 P. burtonill의 과증식에 대한 최초의 보고이다.

• 대한수의학회지
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• 제44권4호
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• pp.551-559
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• 2004

Shiga toxin-producing Escherichia coli (STEC) causes various clinical signs in human and animals, and has been indicated as a global enteropathogen with zoonotic importance. In this study, the feces of healthy pigs were collected from the slaughtered pigs of Daejon abattoir during the period from December 2001 to October 2002. Of 326 specimens, 13 STEC were confirmed by culture, PCR and colony hybridization. The isolates were further studied for toxin types, pathogenic factors, plasmid profiles, and antimicrobial resistance to characterize the genetic and toxigenic properties. In PCR, all of 13 isolates were evident to have shiga toxin gene (stx). Of 13 isolates stx1 gene was detected in 4 and stx2 gene in 9. The genes of eaeA, hlyA and rfbE were not present in any isolates. In colony hybridization using shiga toxin common primer (STXc), 2 to 9 per 100 colonies subcultured from 13 isolates showed the positive reaction. In the examination for plasmid profiles of the isolates, one to eleven plasmids with varying sizes of 1.0 Kb to 100 Kb were detected, and the 13 STEC could be classified into four groups by the plasmid patterns. The antimicrobial resistance patterns of the isolates were comparably corresponded with the plasmid profile patterns.

• 한국축산식품학회지
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• 제32권4호
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• pp.434-440
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• 2012

It has been suggested that probiotics could be useful for the prevention of symptomatic relapse in patients with inflammatory bowel disease (IBD). Interleukin (IL)-8 has been well recognized as one of the pro-inflammatory cytokines that could trigger inflammation and epithelial barrier dysfunction. In this study, the anti-inflammatory effects of probiotics were investigated using a human epithelial cell line (HT-29). Probiotics from infant feces and kimchi were tested for their cytotoxicity and effects on adhesion to epithelial cells. The present results show that seven strains could form 70 % adhesion on HT-29. The probiotics used in this study did not affect HT-29 cell viability. To screen anti-inflammatory lactic acid bacteria, HT-29 cells were pretreated with live and heat-killed probiotics, and lipopolysaccharide (LPS) ($1{\mu}g/mL$) was then added to stimulate the cells. The cell culture supernatant was then used to measure IL-8 secretion by ELISA, and the cell pellet was used to determine IL-8 and toll-like receptor (TLR-4) mRNA expression levels by RT-PCR. Some probiotics (KJP421, KDK411, SRK414, E4191, KY21, and KY210) exhibited anti-inflammatory effects through the repression of IL-8 secretion from HT-29 cells. In particular, Lactobacillus salivarius E4191, originating from Egyptian infant feces, not only decreased IL-8 mRNA expression, but also decreased TLR-4 expression. These results indicate that Lactobacillus salivarius E4191 may have a protective effect in intestinal epithelial cells.

• 한국미생물·생명공학회지
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• 제44권2호
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• pp.140-144
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• 2016

사람의 분변으로부터 분리한 Bacteroides stericoris HJ-15로부터 chondroitinase ABC 유전자를 클로닝하였다. 클로닝한 chondroitinase ABC 유전자는 3,090 bp, 1,029 아미노산으로 구성되어 있었다. B. stercoris chondroitinase ABC 유전자는 이미 보고된 chondroitinase ABC 유전자들과 호몰로지가 없었으나, 아미노산서열에서는 82% 호몰로지를 보였다. T7 promoter를 가진 pET-26b+ expression vector에 클로닝한 chondroitinase ABC 유전자를 Escherichia coli BL21 (DE3)에서 발현하여 정제한 재조합 chondroitinase ABC는 chondroitin sulfate A, B 및 C를 모두 분해하였다.

• Journal of Microbiology and Biotechnology
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• 제28권5호
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• pp.688-696
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• 2018

Ginseng and probiotics have anti-obesity effects in mice fed a high-fat diet (HFD). Absorption of ginsenoside and colonization of probiotics occur in the intestine. In this study, a mixture of fermented ginseng and two probiotics, Bifidobacterium longum BORI and Lactobacillus paracasei CH88, was administered to HFD-fed mice for 9 weeks. The mixture significantly suppressed weight gain (p < 0.05, n = 8) and lipid deposition in the liver and adipose tissues as well as increased the mice's food intake. The adipocyte size of the adipose tissue was significantly decreased in the mixture-fed group, especially when 0.5% fermented ginseng and $5{\times}10^8/ml$ of the two probiotics were used (p < 0.05, n = 10). The expression of TNF-${\alpha}$ in adipose tissue was efficiently downregulated in the mixture-fed group (p < 0.05, n = 4). The supplement also improved the mice's fasting blood glucose levels (p < 0.05, n = 8) and total cholesterol feces excretion (p < 0.05, n = 8). The mixture of fermented ginseng and B. longum BORI and L. paracasei CH88 could have an anti-obesity effect and suppress lipid deposit in the liver and adipose tissues.

• Journal of Microbiology and Biotechnology
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• 제17권7호
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• pp.1120-1126
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• 2007

This study was performed to screen probiotic bifidobacteria for their ability to bind and neutralize lipopolysaccharides (LPS) from Escherichia coli and to verify the relationship between LPS-binding ability, cell surface hydrophobicity (CSH), and inhibition of LPS-induced interleukin-8 (IL-8) secretion by HT-29 cells of the various bifidobacterial strains. Ninety bifidobacteria isolates from human feces were assessed for their ability to bind fluorescein isothiocyanate (FITC)-labeled LPS from E. coli. Isolates showing 30-60% binding were designated LPS-high binding (LPS-H) and those with less than 15% binding were designated LPS-low binding (LPS-L). The CSH, autoaggregation (AA), and inhibition of LPS-induced IL-8 release from HT-29 cells of the LPS-H and LPS-L groups were evaluated. Five bifidobacteria strains showed high levels of LPS binding, CSH, AA, and inhibition of IL-8 release. However, statistically significant correlations between LPS binding, CSH, AA, and reduction of IL-8 release were not found. Although we could isolate bifidobacteria with high LPS-binding ability, CSH, AA, and inhibition of IL-8 release, each characteristic should be considered as strain dependent. Bifidobacteria with high LPS binding and inhibition of IL-8 release may be good agents for preventing inflammation by neutralizing Gram-negative endotoxins and improving intestinal health.

• Parasites, Hosts and Diseases
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• 제49권4호
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• pp.423-426
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• 2011

In the genus Cryptosporidium, there are more than 14 species with different sizes and habitats, as well as different hosts. Among these, C. parvum and C. hominis are known to be human pathogens. As C. parvum can survive exposure to harsh environmental conditions, including various disinfectants or high doses of radiation, it is considered to be an important environmental pathogen that may be a threat to human health. However, the resistance of other Cryptosporidium species to various environmental conditions is unknown. In this study, resistance against ${\gamma}$-irradiation was compared between C. parvum and C. muris using in vivo infection in mice. The capability of C. muris to infect mice could be eliminated with 1,000 Gy of ${\gamma}$-irradiation, while C. parvum remained infective in mice after up to 1,000 Gy of ${\gamma}$-irradiation, although the peak number of oocysts per gram of feces decreased to 16% that of non-irradiated oocysts. The difference in radioresistance between these 2 Cryptosporidium species should be investigated by further studies.

• 생약학회지
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• 제28권1호
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• pp.35-41
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• 1997

Following ginsenoside-Rb1-hydrolyzing assay, strictly anaerobic bacteria were isolated from human feces and identified as Prevotella oris. The bacteria hydrolyzed ginsenoside Rb1 and Rd to $20-O-{\beta}-D-glucopyranosyl-20(S)-protopanaxadiol$ (I), ginsenoside Rb2 to $20-O-[{\alpha}-L-arabinofuranosyl (1{\rightarrow}6)-{\beta}-D-glucopyranosyl] - 20(S)-protopanaxadiol$ (ll) and ginsenoside Rc to $20-O-[{\alpha}-L-arabinofuranosyl (1{\rightarrow} 6){\beta}-D-g1ucopyranosyl]-20(S)-protopanaxadiol$ (III) like fecal microflora, but did not attack ginsenoside Re nor Rgl (Protopanaxatriol-type). Pharmacokinetic studies of ginseng saponins was also performed using specific pathogen free rats and demonstrated that the intestinal bacterial metabolites I-111, 20(S)- protopanaxatriol(IV) and 20(S)-protopanaxadiol(V) were absorbed from the intestines to $blood(0.4-5.1\;{\mu}g/ml)$ after oral administration with total saponin(1 g/kg/day).