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Evaluation of probiotic activity of Lactobacillus casei strains- [electronic resource]
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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