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Mitophagy as a β-Cell Adaptation to Metabolic Stress
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
저자명  
Levi-D'Ancona, Elena.
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  
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MARC

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■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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