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A Noncanonical Role of T Follicular Helper Cells in Promoting Peripheral Tolerance by Supporting T Regulatory Cells
A Noncanonical Role of T Follicular Helper Cells in Promoting Peripheral Tolerance by Supp...
A Noncanonical Role of T Follicular Helper Cells in Promoting Peripheral Tolerance by Supporting T Regulatory Cells

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202104658
ISBN  
9798293828975
DDC  
616.079
저자명  
Dave, Shivangi.
서명/저자  
A Noncanonical Role of T Follicular Helper Cells in Promoting Peripheral Tolerance by Supporting T Regulatory Cells
발행사항  
[Sl] : The University of Alabama at Birmingham, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
193 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
주기사항  
Advisor: Ballesteros-Tato, Andre.
학위논문주기  
Thesis (Ph.D.)--The University of Alabama at Birmingham, 2025.
초록/해제  
요약T follicular helper (Tfh) cells are a specialized subset of CD4+ T cells that support germinal center (GC) B cells and promote antibody (Ab)-mediated immunity. There is growing recognition of the heterogeneity and functional diversity of Tfh cells, supported by accumulating evidence that highlights their context-specific roles across a range of disease settings. While their contribution to B cell responses is well-established, our data demonstrate that Tfh cells have a broader and more dynamic function. In this study, we uncover a novel function of Tfh cells in maintaining immune homeostasis by supporting T regulatory cell (Treg) responses under normal physiological conditions. Interleukin-2 (IL-2) is a non-redundant cytokine essential for the development, maintenance, and function of Tregs. However, the relative contribution of IL-2-producing CD4⁺ T cell subsets across different spatial niches within gut-associated lymphoid tissues (GALT) remains poorly understood. We show that, under steady-state conditions, Tfh cells in the mesenteric lymph nodes (mLNs) and Peyer's patches (PPs) serve as a prominent source of IL-2. Within the mLNs, IL-2-producing Tfh cells are primarily localized to the interfollicular (IF) region and the T: B border. In addition to the T cell area, our data show that Tregs are also present in the IF region and at the T: B border, where they frequently co-localize with Tfh cells. This spatially restricted IL-2 production appears to be essential for maintaining Treg identity and function within the gastrointestinal (G.I) tract. Strikingly, selective deletion of IL-2 from Tfh cells results in a breakdown of immune tolerance, characterized by Treg dysfunction, uncontrolled immune activation, and fatal multi-organ inflammation. Comprehensive functional assays and transcriptional profiling revealed that IL-2 derived from Tfh cells is essential for sustaining the competitive fitness of Tregs in the context of constant exposure to the G.I antigens. Taken together, our findings reveal an unappreciated role for Tfh cells as a key source of paracrine IL-2 required for sustaining Treg-mediated immune regulation in the gut. This study highlights an essential axis of Tfh-Treg crosstalk that extends the functional scope of Tfh cells beyond B cell help.
일반주제명  
Immunology
일반주제명  
Cellular biology
일반주제명  
Biology
일반주제명  
Molecular biology
키워드  
Gut tolerance
키워드  
Interleukin-2
키워드  
T follicular helper
키워드  
T regulatory cell
기타저자  
The University of Alabama at Birmingham Joint Health Sciences
기본자료저록  
Dissertations Abstracts International. 87-03B.
전자적 위치 및 접속  
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MARC

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■040    ▼aMiAaPQ▼cMiAaPQ
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■1001  ▼aDave,  Shivangi.
■24512▼aA  Noncanonical  Role  of  T  Follicular  Helper  Cells  in  Promoting  Peripheral  Tolerance  by  Supporting  T  Regulatory  Cells
■260    ▼a[Sl]▼bThe  University  of  Alabama  at  Birmingham▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a193  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-03,  Section:  B.
■500    ▼aAdvisor:  Ballesteros-Tato,  Andre.
■5021  ▼aThesis  (Ph.D.)--The  University  of  Alabama  at  Birmingham,  2025.
■520    ▼aT  follicular  helper  (Tfh)  cells  are  a  specialized  subset  of  CD4+  T  cells  that  support  germinal  center  (GC)  B  cells  and  promote  antibody  (Ab)-mediated  immunity.  There  is  growing  recognition  of  the  heterogeneity  and  functional  diversity  of  Tfh  cells,  supported  by  accumulating  evidence  that  highlights  their  context-specific  roles  across  a  range  of  disease  settings.  While  their  contribution  to  B  cell  responses  is  well-established,  our  data  demonstrate  that  Tfh  cells  have  a  broader  and  more  dynamic  function.  In  this  study,  we  uncover  a  novel  function  of  Tfh  cells  in  maintaining  immune  homeostasis  by  supporting  T  regulatory  cell  (Treg)  responses  under  normal  physiological  conditions.  Interleukin-2  (IL-2)  is  a  non-redundant  cytokine  essential  for  the  development,  maintenance,  and  function  of  Tregs.  However,  the  relative  contribution  of  IL-2-producing  CD4⁺  T  cell  subsets  across  different  spatial  niches  within  gut-associated  lymphoid  tissues  (GALT)  remains  poorly  understood.  We  show  that,  under  steady-state  conditions,  Tfh  cells  in  the  mesenteric  lymph  nodes  (mLNs)  and  Peyer's  patches  (PPs)  serve  as  a  prominent  source  of  IL-2.  Within  the  mLNs,  IL-2-producing  Tfh  cells  are  primarily  localized  to  the  interfollicular  (IF)  region  and  the  T:  B  border.  In  addition  to  the  T  cell  area,  our  data  show  that  Tregs  are  also  present  in  the  IF  region  and  at  the  T:  B  border,  where  they  frequently  co-localize  with  Tfh  cells.  This  spatially  restricted  IL-2  production  appears  to  be  essential  for  maintaining  Treg  identity  and  function  within  the  gastrointestinal  (G.I)  tract.  Strikingly,  selective  deletion  of  IL-2  from  Tfh  cells  results  in  a  breakdown  of  immune  tolerance,  characterized  by  Treg  dysfunction,  uncontrolled  immune  activation,  and  fatal  multi-organ  inflammation.  Comprehensive  functional  assays  and  transcriptional  profiling  revealed  that  IL-2  derived  from  Tfh  cells  is  essential  for  sustaining  the  competitive  fitness  of  Tregs  in  the  context  of  constant  exposure  to  the  G.I  antigens.  Taken  together,  our  findings  reveal  an  unappreciated  role  for  Tfh  cells  as  a  key  source  of  paracrine  IL-2  required  for  sustaining  Treg-mediated  immune  regulation  in  the  gut.  This  study  highlights  an  essential  axis  of  Tfh-Treg  crosstalk  that  extends  the  functional  scope  of  Tfh  cells  beyond  B  cell  help.
■590    ▼aSchool  code:  0005.
■650  4▼aImmunology
■650  4▼aCellular  biology
■650  4▼aBiology
■650  4▼aMolecular  biology
■653    ▼aGut  tolerance
■653    ▼aInterleukin-2
■653    ▼aT  follicular  helper
■653    ▼aT  regulatory  cell
■690    ▼a0982
■690    ▼a0379
■690    ▼a0306
■690    ▼a0307
■71020▼aThe  University  of  Alabama  at  Birmingham▼bJoint  Health  Sciences.
■7730  ▼tDissertations  Abstracts  International▼g87-03B.
■790    ▼a0005
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358413▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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