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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 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
- 기타저자
- The University of Alabama at Birmingham Joint Health Sciences
- 기본자료저록
- Dissertations Abstracts International. 87-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■006m o d
■007cr#unu||||||||
■020 ▼a9798293828975
■035 ▼a(MiAaPQ)AAI32116003
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a616.079
■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.


