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Mitophagy as a β-Cell Adaptation to Metabolic Stress
Mitophagy as a β-Cell Adaptation to Metabolic Stress
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105215
- ISBN
- 9798291565568
- DDC
- 616.4
- 서명/저자
- Mitophagy as a β-Cell Adaptation to Metabolic Stress
- 발행사항
- [Sl] : University of Michigan, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 170 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
- 주기사항
- Advisor: Soleimanpour, Scott A.
- 학위논문주기
- Thesis (Ph.D.)--University of Michigan, 2025.
- 초록/해제
- 요약Pancreatic β-cells are central to maintaining glucose homeostasis, and their dysfunction is a hallmark of type 2 diabetes (T2D). As metabolic stress from high-fat diets becomes increasingly prevalent, understanding how β-cells adapt to such stress is critical. This dissertation investigates mitophagy, a selective form of mitochondrial autophagy, as a key protective mechanism that supports β-cell adaptation and function under metabolic stress. In Chapter One, I examine how various stressors impair mitochondrial quality control in β-cells and highlight the therapeutic potential of enhancing mitophagy to preserve β-cell function. Chapter Two introduces a novel, dye-based assay to quantify mitophagy flux, offering a practical and scalable method to study this process in β-cells. Chapter Three focuses on the role of innate immune signaling in β-cell adaptation. While activation of innate immunity is a feature of immunometabolic diseases like T2D, its role in pancreatic β-cells had not been probed. In this chapter, I identify the E3 ubiquitin ligase TRAF6 as a critical regulator of β-cell mitophagy in response to metabolic stress. Although TRAF6 is dispensable under basal conditions, it becomes essential during diet-induced obesity, where it promotes insulin secretion, mitochondrial respiration, and mitophagy in both mouse and human islets. Mechanistically, TRAF6 facilitates the recruitment of mitophagy proteins in both the Parkin-dependent (ubiquitin-mediated) and Parkin-independent (receptor-mediated) mitophagy pathways. Notably, the effects of TRAF6 deficiency on glucose homeostasis and mitophagy are fully reversed by the concomitant loss of Parkin. My work suggests that TRAF6 promotes adaptive β-cell responses by restricting Parkin activity and enabling cross-regulation of mitophagy pathways. Together, these studies position mitophagy as a central determinant of β-cell resilience and reveal a previously unappreciated role for innate immune signaling in maintaining glucose homeostasis under metabolic stress. These findings provide mechanistic insights that may inform the development of therapeutic strategies targeting mitochondrial quality control in T2D.
- 일반주제명
- Endocrinology
- 일반주제명
- Immunology
- 일반주제명
- Cellular biology
- 키워드
- β-cells
- 키워드
- Mitophagy
- 키워드
- Diabetes
- 키워드
- Innate immunity
- 기타저자
- University of Michigan Immunology
- 기본자료저록
- Dissertations Abstracts International. 87-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202105215
■006m o d
■007cr#unu||||||||
■020 ▼a9798291565568
■035 ▼a(MiAaPQ)AAI32271747
■035 ▼a(MiAaPQ)umichrackham006284
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a616.4
■1001 ▼aLevi-D'Ancona, Elena.
■24510▼aMitophagy as a β-Cell Adaptation to Metabolic Stress
■260 ▼a[Sl]▼bUniversity of Michigan▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a170 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-03, Section: B.
■500 ▼aAdvisor: Soleimanpour, Scott A.
■5021 ▼aThesis (Ph.D.)--University of Michigan, 2025.
■520 ▼aPancreatic β-cells are central to maintaining glucose homeostasis, and their dysfunction is a hallmark of type 2 diabetes (T2D). As metabolic stress from high-fat diets becomes increasingly prevalent, understanding how β-cells adapt to such stress is critical. This dissertation investigates mitophagy, a selective form of mitochondrial autophagy, as a key protective mechanism that supports β-cell adaptation and function under metabolic stress. In Chapter One, I examine how various stressors impair mitochondrial quality control in β-cells and highlight the therapeutic potential of enhancing mitophagy to preserve β-cell function. Chapter Two introduces a novel, dye-based assay to quantify mitophagy flux, offering a practical and scalable method to study this process in β-cells. Chapter Three focuses on the role of innate immune signaling in β-cell adaptation. While activation of innate immunity is a feature of immunometabolic diseases like T2D, its role in pancreatic β-cells had not been probed. In this chapter, I identify the E3 ubiquitin ligase TRAF6 as a critical regulator of β-cell mitophagy in response to metabolic stress. Although TRAF6 is dispensable under basal conditions, it becomes essential during diet-induced obesity, where it promotes insulin secretion, mitochondrial respiration, and mitophagy in both mouse and human islets. Mechanistically, TRAF6 facilitates the recruitment of mitophagy proteins in both the Parkin-dependent (ubiquitin-mediated) and Parkin-independent (receptor-mediated) mitophagy pathways. Notably, the effects of TRAF6 deficiency on glucose homeostasis and mitophagy are fully reversed by the concomitant loss of Parkin. My work suggests that TRAF6 promotes adaptive β-cell responses by restricting Parkin activity and enabling cross-regulation of mitophagy pathways. Together, these studies position mitophagy as a central determinant of β-cell resilience and reveal a previously unappreciated role for innate immune signaling in maintaining glucose homeostasis under metabolic stress. These findings provide mechanistic insights that may inform the development of therapeutic strategies targeting mitochondrial quality control in T2D.
■590 ▼aSchool code: 0127.
■650 4▼aEndocrinology
■650 4▼aImmunology
■650 4▼aCellular biology
■653 ▼aβ-cells
■653 ▼aMitophagy
■653 ▼aDiabetes
■653 ▼aInnate immunity
■690 ▼a0409
■690 ▼a0982
■690 ▼a0379
■71020▼aUniversity of Michigan▼bImmunology.
■7730 ▼tDissertations Abstracts International▼g87-03B.
■790 ▼a0127
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359792▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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