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Modulation of T Cell Trafficking to the Small and Large Intestine Mucosa
Modulation of T Cell Trafficking to the Small and Large Intestine Mucosa
Modulation of T Cell Trafficking to the Small and Large Intestine Mucosa

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20250211151451
ISBN  
9798382784915
DDC  
574
저자명  
Chen, Ziqi.
서명/저자  
Modulation of T Cell Trafficking to the Small and Large Intestine Mucosa
발행사항  
[Sl] : Harvard University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
94 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
주기사항  
Advisor: von Andrian, Ulrich.
학위논문주기  
Thesis (Ph.D.)--Harvard University, 2024.
초록/해제  
요약Infections of the gastrointestinal (GI) tract have a high disease burden globally, and effective vaccines are needed to reduce the spread of many GI pathogens. A majority of clinical and pre-clinical vaccines are delivered parenterally, such as by subcutaneous (s.c.) or intramuscular (i.m.) injections. While these routes are effective at establishing systemic protection, they are often poor at eliciting protective antibodies and T cell responses in the gut, leaving the mucosa susceptible to pathogen entry, and possibly replication and transmission.Therefore, a strategy that generates gut-tropic T cells in a parenteral immunization has the potential to improve vaccine efficacy, which is presented in my dissertation. Modulation of CD8+ T cell trafficking was achieved by adjuvantation with "gut-imprinting" signals - tissue-specific cues that promote entry ("homing") of antigen-experienced lymphocytes into the gut, through up-regulation of homing molecules.I immunized mice s.c. with a model antigen chicken ovalbumin (OVA) and an adjuvant CpG, in combination with gut-imprinting compounds. Vaccine supplementation with all-trans retinoic acid (ATRA) as well as Am80, a synthetic retinoic acid receptor (RAR) agonist, increased expression of small intestine homing molecules α4β7 and CCR9, increased T cell trafficking to the small intestine, and established resident-memory T (Trm) cells. Additionally, an Am80-encapsulating polymeric nanoparticle was developed which showed equivalent gut-imprinting capacity and improved clinical translatability, compared to the un-encapsulated Am80.Unlike the small intestine, Am80 alone was sub-optimal at targeting CD8+ T cells to the large intestine. Optimal targeting to the cecum and colon required a combination of RAR agonist (Am80) and aryl-hydrocarbon receptor (AHR) agonist (10-CL-BBQ), respectively up-regulating α4β7 and the large intestine homing molecule GPR15. Both the RAR-α4β7 axis and AHR-GPR15 axis were indispensable for large intestine trafficking, whereas AHR was dispensable for small intestine trafficking, suggesting a mechanism for compartmentalized T cell entry into different segments of the GI tract. In the s.c. vaccination model, combined administration of Am80 and 10-CL-BBQ yielded the most robust large intestine trafficking α4β7+ GPR15+ effector T (Teff) cells, established Trm cells in the total intestinal tract, and conferred protection against intra-rectal challenge with Listeria Monocytogenes.In summary, I conclude that CD8+ T cell trafficking to the small and large intestine are differentially regulated by the RAR and AHR signaling pathways, and that adjuvantation of parenteral vaccines with agonists of RAR and AHR are viable approaches to enhance T cell protection of the intestinal tract.
일반주제명  
Biology
일반주제명  
Cellular biology
일반주제명  
Biochemistry
일반주제명  
Immunology
키워드  
Gastrointestinal
키워드  
Immunization
키워드  
Ovalbumin
키워드  
Cell trafficking
키워드  
Aryl-hydrocarbon receptor
기타저자  
Harvard University Medical Sciences
기본자료저록  
Dissertations Abstracts International. 85-12B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aChen,  Ziqi.▼0(orcid)0000-0002-3512-1190
■24510▼aModulation  of  T  Cell  Trafficking  to  the  Small  and  Large  Intestine  Mucosa
■260    ▼a[Sl]▼bHarvard  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a94  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-12,  Section:  B.
■500    ▼aAdvisor:  von  Andrian,  Ulrich.
■5021  ▼aThesis  (Ph.D.)--Harvard  University,  2024.
■520    ▼aInfections  of  the  gastrointestinal  (GI)  tract  have  a  high  disease  burden  globally,  and  effective  vaccines  are  needed  to  reduce  the  spread  of  many  GI  pathogens.  A  majority  of  clinical  and  pre-clinical  vaccines  are  delivered  parenterally,  such  as  by  subcutaneous  (s.c.)  or  intramuscular  (i.m.)  injections.  While  these  routes  are  effective  at  establishing  systemic  protection,  they  are  often  poor  at  eliciting  protective  antibodies  and  T  cell  responses  in  the  gut,  leaving  the  mucosa  susceptible  to  pathogen  entry,  and  possibly  replication  and  transmission.Therefore,  a  strategy  that  generates  gut-tropic  T  cells  in  a  parenteral  immunization  has  the  potential  to  improve  vaccine  efficacy,  which  is  presented  in  my  dissertation.  Modulation  of  CD8+  T  cell  trafficking  was  achieved  by  adjuvantation  with  "gut-imprinting"  signals  -  tissue-specific  cues  that  promote  entry  ("homing")  of  antigen-experienced  lymphocytes  into  the  gut,  through  up-regulation  of  homing  molecules.I  immunized  mice  s.c.  with  a  model  antigen  chicken  ovalbumin  (OVA)  and  an  adjuvant  CpG,  in  combination  with  gut-imprinting  compounds.  Vaccine  supplementation  with  all-trans  retinoic  acid  (ATRA)  as  well  as  Am80,  a  synthetic  retinoic  acid  receptor  (RAR)  agonist,  increased  expression  of  small  intestine  homing  molecules  α4β7  and  CCR9,  increased  T  cell  trafficking  to  the  small  intestine,  and  established  resident-memory  T  (Trm)  cells.  Additionally,  an  Am80-encapsulating  polymeric  nanoparticle  was  developed  which  showed  equivalent  gut-imprinting  capacity  and  improved  clinical  translatability,  compared  to  the  un-encapsulated  Am80.Unlike  the  small  intestine,  Am80  alone  was  sub-optimal  at  targeting  CD8+  T  cells  to  the  large  intestine.  Optimal  targeting  to  the  cecum  and  colon  required  a  combination  of  RAR  agonist  (Am80)  and  aryl-hydrocarbon  receptor  (AHR)  agonist  (10-CL-BBQ),  respectively  up-regulating  α4β7  and  the  large  intestine  homing  molecule  GPR15.  Both  the  RAR-α4β7  axis  and  AHR-GPR15  axis  were  indispensable  for  large  intestine  trafficking,  whereas  AHR  was  dispensable  for  small  intestine  trafficking,  suggesting  a  mechanism  for  compartmentalized  T  cell  entry  into  different  segments  of  the  GI  tract.  In  the  s.c.  vaccination  model,  combined  administration  of  Am80  and  10-CL-BBQ  yielded  the  most  robust  large  intestine  trafficking  α4β7+  GPR15+  effector  T  (Teff)  cells,  established  Trm  cells  in  the  total  intestinal  tract,  and  conferred  protection  against  intra-rectal  challenge  with  Listeria  Monocytogenes.In  summary,  I  conclude  that  CD8+  T  cell  trafficking  to  the  small  and  large  intestine  are  differentially  regulated  by  the  RAR  and  AHR  signaling  pathways,  and  that  adjuvantation  of  parenteral  vaccines  with  agonists  of  RAR  and  AHR  are  viable  approaches  to  enhance  T  cell  protection  of  the  intestinal  tract.
■590    ▼aSchool  code:  0084.
■650  4▼aBiology
■650  4▼aCellular  biology
■650  4▼aBiochemistry
■650  4▼aImmunology
■653    ▼aGastrointestinal
■653    ▼aImmunization
■653    ▼aOvalbumin
■653    ▼aCell  trafficking
■653    ▼aAryl-hydrocarbon  receptor
■690    ▼a0306
■690    ▼a0379
■690    ▼a0487
■690    ▼a0982
■71020▼aHarvard  University▼bMedical  Sciences.
■7730  ▼tDissertations  Abstracts  International▼g85-12B.
■790    ▼a0084
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17161832▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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