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Evaluation of probiotic activity of Lactobacillus casei strains- [electronic resource]
Evaluation of probiotic activity of Lactobacillus casei strains- [electronic resource]
상세정보
- 자료유형
- 학위논문(국외)
- 자관 청구기호
- 기본표목-개인명
- 표제와 책임표시사항
- Evaluation of probiotic activity of Lactobacillus casei strains - [electronic resource] / Aktas, Busra.
- 발행, 배포, 간사 사항
- 형태사항
- 1 online resource(195 p)
- 일반주기
- Source: Dissertation Abstracts International, Volume: 77-10(E), Section: B.
- 일반주기
- Adviser: James L. Steel.
- 학위논문주기
- Thesis (Ph.D.)--The University of Wisconsin - Madison, 2015.
- 요약 등 주기
- 요약Probiotics are live microorganisms, which when administered in adequate amounts, confer a health benefit on the host. Lactobacillus casei is a probiotic species of particular interest due to it being commonly consumed worldwide as a probiotic. Significant genetic variation exists between L. casei strains, with 32-45% of the genome-content being variable. Therefore, strain-to-strain differences in their probiotic efficacy are likely. This dissertation describes the use of L. casei strains to modulate the gut microbiota and immune function; additionally L. casei strains were functionally and genomically examined to unravel their probiotic mechanisms of action. First study demonstrated that L. casei 32G administration modified the cecum-microbiota in a dose and time dependent manner. An increase in prevalence of Lactobacillus in the gut microbiota was observed after 32G-administration. The lactobacilli increased were determined to be commensal lactobacilli. In the second study different L. casei strains were compared. While some L. casei strains didn't modify the cecum-microbiota, others reconfigured the microbial composition in a strain-specific manner. Moreover, the results suggest there is a correlation between a strain's ability to alter the gut microbiota composition with the strain's ability to alter the expression of PRRs and AMPs. The last study employed a combination of bioinformatics, in vitro and in vivo studies to explore the mechanisms of L. casei probiotic action. L. casei strains were determined to contain a diversity of cell-surface structures. In vitro studies revealed that both cell-surface components and supernatant participate in immunomodulation. In vivo results suggest that supernatant from 32G is likely involved in altering the gut microbiota, while cell-surface components are involved in modulating the immune system.
- 요약 등 주기
- 요약In conclusion, L. casei alters the composition of gut microbiota and modulates the innate immune system in a strain-specific manner. These alterations were determined to be dose and time dependent. There is extensive genetic diversity in cell-surface components within L. casei strains and this diversity contributes to the strain-specific variation in immunomodulation and host-bacteria interactions observed within species. Additionally, it is clear that supernatant are also involved in probiotic function. This thesis begins the process of identifying potential mechanisms of L. casei probiotic activity.
- 주제명부출표목-일반주제명
- 주제명부출표목-일반주제명
- 부출표목-단체명
- 기본자료저록
- Dissertation Abstracts International. 77-10B(E).
- 기본자료저록
- Dissertation Abstract International
- 전자적 위치 및 접속
- 원문정보보기
- 소장사항
-
20170404 2017
MARC
008170601s2015 us esm 001c eng■001MOKWON01252485
■00520170418114837
■007cr
■020 ▼a9781339868950
■035 ▼a(MiAaPQ)AAI10128917
■040 ▼aMiAaPQ▼cMiAaPQ
■090 ▼a전자도서(박사논문)
■1001 ▼aAktas, Busra.
■24510▼aEvaluation of probiotic activity of Lactobacillus casei strains▼h[electronic resource]▼cAktas, Busra.
■260 ▼a[Sl]▼bThe University of Wisconsin - Madison▼c2015
■300 ▼a1 online resource(195 p)
■500 ▼aSource: Dissertation Abstracts International, Volume: 77-10(E), Section: B.
■500 ▼aAdviser: James L. Steel.
■5021 ▼aThesis (Ph.D.)--The University of Wisconsin - Madison, 2015.
■520 ▼aProbiotics are live microorganisms, which when administered in adequate amounts, confer a health benefit on the host. Lactobacillus casei is a probiotic species of particular interest due to it being commonly consumed worldwide as a probiotic. Significant genetic variation exists between L. casei strains, with 32-45% of the genome-content being variable. Therefore, strain-to-strain differences in their probiotic efficacy are likely. This dissertation describes the use of L. casei strains to modulate the gut microbiota and immune function; additionally L. casei strains were functionally and genomically examined to unravel their probiotic mechanisms of action. First study demonstrated that L. casei 32G administration modified the cecum-microbiota in a dose and time dependent manner. An increase in prevalence of Lactobacillus in the gut microbiota was observed after 32G-administration. The lactobacilli increased were determined to be commensal lactobacilli. In the second study different L. casei strains were compared. While some L. casei strains didn't modify the cecum-microbiota, others reconfigured the microbial composition in a strain-specific manner. Moreover, the results suggest there is a correlation between a strain's ability to alter the gut microbiota composition with the strain's ability to alter the expression of PRRs and AMPs. The last study employed a combination of bioinformatics, in vitro and in vivo studies to explore the mechanisms of L. casei probiotic action. L. casei strains were determined to contain a diversity of cell-surface structures. In vitro studies revealed that both cell-surface components and supernatant participate in immunomodulation. In vivo results suggest that supernatant from 32G is likely involved in altering the gut microbiota, while cell-surface components are involved in modulating the immune system.
■520 ▼aIn conclusion, L. casei alters the composition of gut microbiota and modulates the innate immune system in a strain-specific manner. These alterations were determined to be dose and time dependent. There is extensive genetic diversity in cell-surface components within L. casei strains and this diversity contributes to the strain-specific variation in immunomodulation and host-bacteria interactions observed within species. Additionally, it is clear that supernatant are also involved in probiotic function. This thesis begins the process of identifying potential mechanisms of L. casei probiotic activity.
■590 ▼aSchool code: 0262.
■650 4▼aFood science
■650 4▼aMicrobiology
■690 ▼a0359
■690 ▼a0410
■71020▼aThe University of Wisconsin - Madison▼bFood Science.
■7730 ▼tDissertation Abstracts International▼g77-10B(E).
■773 ▼tDissertation Abstract International
■790 ▼a0262
■791 ▼aPh.D.
■792 ▼a2015
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T14488343▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
■980 ▼a20170404▼f2017
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