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Exploration of Exhausted CD8+ T Cell Subset Diversity During Chronic Viral Infection and Cancer: A Role for Gfi1
Exploration of Exhausted CD8+ T Cell Subset Diversity During Chronic Viral Infection and C...
Exploration of Exhausted CD8+ T Cell Subset Diversity During Chronic Viral Infection and Cancer: A Role for Gfi1

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자료유형  
 학위논문 서양
최종처리일시  
20260202103102
ISBN  
9798315745143
DDC  
616.079
저자명  
Ojo, Oluwagbemiga A.
서명/저자  
Exploration of Exhausted CD8+ T Cell Subset Diversity During Chronic Viral Infection and Cancer: A Role for Gfi1
발행사항  
[Sl] : The University of Alabama at Birmingham, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
201 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-11, Section: B.
주기사항  
Includes supplementary digital materials.
주기사항  
Advisor: Welner, Robert Samuel.
학위논문주기  
Thesis (Ph.D.)--The University of Alabama at Birmingham, 2025.
초록/해제  
요약Continued persistence of high antigen levels in chronic viral infection and tumor settings induces molecular adaptations in CD8+ T cells that has been termed dysfunction or exhaustion. Although exhausted cells exhibit profound loss of effector functions, the exacerbated viral titer and tumor burden in the absence of these cells highlights their crucial role in maintaining the balance between tissue pathology and antigen clearance. Exhausted CD8+ T cells are a heterogeneous pool with unique functions that contribute to virus or tumor control. Yet, we lack a complete understanding of the subset dynamics as the disease develops. Here, we provide detailed characterization of CD8+ T cells during exhaustion. Using a chronic viral infection model, we identify a previously undescribed population of Transitional Ly108+CX3CR1+ cells in addition to the progenitor, effector-like and terminally-exhausted cells that were previously described. We show that Transitional cells are the direct precursors of the exhausted effector-like and terminally-exhausted cells. During tumorigenesis, we discovered that early infiltrating CD8+ T cells are progenitor cells that differentiate into Tim3hiTbetlo and Tim3hiTbethi effector cells. The Tim3+ cells differentially express the transcription factors Eomes and Tox that promote exhaustion and are associated with response to inhibitory receptor blockade.Analysis of exhausted CD8+ T cells identified the transcriptional repressor Gfi1 as a regulator of subset dynamics during exhaustion. Gfi1 expression is reduced as progenitors differentiate into Transitional cells. Differentiation from Transitional cells into the effector-like or terminally-exhausted subset required re-expression of Gfi1. Similarly, we show that differentiation from the Gfi1hi progenitors is associated with reduction in Gfi1 levels; however, its expression was required for terminal differentiation and accumulation of Tim-3hi cells. Overall, the data presented provide a novel role for Gfi1 in the diversification of CD8+ T cell subsets that mediate chronic viral infection and tumor control. These studies provide a better basis for understanding exhausted CD8+ T cell subset development.
일반주제명  
Immunology
일반주제명  
Molecular biology
일반주제명  
Virology
일반주제명  
Cellular biology
일반주제명  
Oncology
키워드  
Cancer
키워드  
T cell
키워드  
Chronic viral infection
키워드  
Tumor control
기타저자  
The University of Alabama at Birmingham Joint Health Sciences
기본자료저록  
Dissertations Abstracts International. 86-11B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aOjo,  Oluwagbemiga  A.
■24510▼aExploration  of  Exhausted  CD8+  T  Cell  Subset  Diversity  During  Chronic  Viral  Infection  and  Cancer:  A  Role  for  Gfi1
■260    ▼a[Sl]▼bThe  University  of  Alabama  at  Birmingham▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a201  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-11,  Section:  B.
■500    ▼aIncludes  supplementary  digital  materials.
■500    ▼aAdvisor:  Welner,  Robert  Samuel.
■5021  ▼aThesis  (Ph.D.)--The  University  of  Alabama  at  Birmingham,  2025.
■520    ▼aContinued  persistence  of  high  antigen  levels  in  chronic  viral  infection  and  tumor  settings  induces  molecular  adaptations  in  CD8+  T  cells  that  has  been  termed  dysfunction  or  exhaustion.  Although  exhausted  cells  exhibit  profound  loss  of  effector  functions,  the  exacerbated  viral  titer  and  tumor  burden  in  the  absence  of  these  cells  highlights  their  crucial  role  in  maintaining  the  balance  between  tissue  pathology  and  antigen  clearance.  Exhausted  CD8+  T  cells  are  a  heterogeneous  pool  with  unique  functions  that  contribute  to  virus  or  tumor  control.  Yet,  we  lack  a  complete  understanding  of  the  subset  dynamics  as  the  disease  develops.  Here,  we  provide  detailed  characterization  of  CD8+  T  cells  during  exhaustion.  Using  a  chronic  viral  infection  model,  we  identify  a  previously  undescribed  population  of  Transitional  Ly108+CX3CR1+  cells  in  addition  to  the  progenitor,  effector-like  and  terminally-exhausted  cells  that  were  previously  described.  We  show  that  Transitional  cells  are  the  direct  precursors  of  the  exhausted  effector-like  and  terminally-exhausted  cells.  During  tumorigenesis,  we  discovered  that  early  infiltrating  CD8+  T  cells  are  progenitor  cells  that  differentiate  into  Tim3hiTbetlo  and  Tim3hiTbethi  effector  cells.  The  Tim3+  cells  differentially  express  the  transcription  factors  Eomes  and  Tox  that  promote  exhaustion  and  are  associated  with  response  to  inhibitory  receptor  blockade.Analysis  of  exhausted  CD8+  T  cells  identified  the  transcriptional  repressor  Gfi1  as  a  regulator  of  subset  dynamics  during  exhaustion.  Gfi1  expression  is  reduced  as  progenitors  differentiate  into  Transitional  cells.  Differentiation  from  Transitional  cells  into  the  effector-like  or  terminally-exhausted  subset  required  re-expression  of  Gfi1.  Similarly,  we  show  that  differentiation  from  the  Gfi1hi  progenitors  is  associated  with  reduction  in  Gfi1  levels;  however,  its  expression  was  required  for  terminal  differentiation  and  accumulation  of  Tim-3hi  cells.  Overall,  the  data  presented  provide  a  novel  role  for  Gfi1  in  the  diversification  of  CD8+  T  cell  subsets  that  mediate  chronic  viral  infection  and  tumor  control.  These  studies  provide  a  better  basis  for  understanding  exhausted  CD8+  T  cell  subset  development.
■590    ▼aSchool  code:  0005.
■650  4▼aImmunology
■650  4▼aMolecular  biology
■650  4▼aVirology
■650  4▼aCellular  biology
■650  4▼aOncology
■653    ▼aCancer
■653    ▼aT  cell
■653    ▼aChronic  viral  infection
■653    ▼aTumor  control
■690    ▼a0982
■690    ▼a0307
■690    ▼a0720
■690    ▼a0379
■690    ▼a0992
■71020▼aThe  University  of  Alabama  at  Birmingham▼bJoint  Health  Sciences.
■7730  ▼tDissertations  Abstracts  International▼g86-11B.
■790    ▼a0005
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17356924▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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