Journal of Animal Science and Technology

Korean Society of Animal Sciences and Technology (한국축산학회)
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Protective Activities of Lactobacillus casei YIT 9018 against Salmonella enteritidis KU101 and Characteristics of 16S-23S rRNA Intergenic Spacer Region Sequence

Lactobacillus spp의 Salmonella enteritidis KU 101에 대한 보호 효과와 L. casei YIT 9018의 16S-23S rRNA Intergenic Spacer Region 염기배열 특성

  • Sung, Bae-Jin (Department of Animal Science and Technology Chung-Ang University) ;
  • Ho, Yoon-Yung (Department of Animal Science and Technology Chung-Ang University)
  • 배진성 (중앙대학교 동물자원과학과) ;
  • 윤영호 (중앙대학교 동물자원과학과)
  • Published : 2003.06.30
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Abstract

In vivo protective and in vitro inhibitory activities of Lactobacillus casei YIT 9018. against typical enteritis causing Salmonella enteritidis KU101 and IgA level after challenge have been determined. In order to identify the strains of lactobacilli the sequences of 16S-23S rRNA intergenic spacer region were determined. All the test strains of Lactobacillus spp. inhibited Salmonella enteritidis, the intensity varied depending upon the species of lactobacilli. Effects on the survival rate of the mouse after challenge with Salmonella enteritidis KU101 on feeding Lactobacillus spp. have shown the highest survival rate in L. helveticus CU 631 followed by L. casei YIT 9018 and L. johnsonii C-4 and the lowest in control mice. The higher level of total Ig A concentration in the intestinal fluid of lactobacilli fed mice than control mice was observed. The sequences of 16S-23S rRNA intergenic spacer region of seven strains of Lactobacillus casei could be utilized as a strain identification, those sequences showed some degree of difference in homology.

Lactobacillus spp. 급여에 의하여 Salmonella enteritidis 감염에 의한 치사율의 저하 성향, 시험관내 억제활성, 장액 내의 총 IgA 농도변화와 Lactobacillus casei.의 16S-23S rRNA intergenic spacer region의 sequence를 측정 비교한 결과는 다음과 같다. Lactobacillus spp. 5균주는 시험관내 Salmo- nella enteritidis 억제활성 측정 결과 모든 시험균주가 억제활성을 나타내었고 그 억제활성의 차이가 통계적인 유의성을 보였으며, 억제활성의 차이는 L. helveticus CU 631 > L. rhamnosus GG ATCC 53103 > L. johnsonii C-4 > L. acidophilus ATCC 4356 > L. casei YIT 9018 인 것으로 나타났다. Lactobacillus spp. 급여에 의하여 Salmonella enteritidis challenge에 의한 치사율 저하효과는 Lb. helveticus CU 631은 대조구의 생존률 62%에 대하여 100%로서 가장 높은 치사율 저하효과를 나타내었고, L casei YIT 9018, L johnsonii C-4의 생존률이 70%와 50%를 나타내었다. Lactobacillus spp.의 16S-23S rRNA intergenic spacer region의 sequence를 측정하고 gene bank에 등록된 균주의 sequence와 비교한 결과 homology의 차이를 나타내었다.

Keywords

References

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