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Unveiling the Pathogenic Role of B Cells in Metabolic Dysfunction-Associated Steatohepatitis
Unveiling the Pathogenic Role of B Cells in Metabolic Dysfunction-Associated Steatohepatit...
Unveiling the Pathogenic Role of B Cells in Metabolic Dysfunction-Associated Steatohepatitis

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202103550
ISBN  
9798286445783
DDC  
616.079
저자명  
Barrow, Fanta.
서명/저자  
Unveiling the Pathogenic Role of B Cells in Metabolic Dysfunction-Associated Steatohepatitis
발행사항  
[Sl] : University of Minnesota, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
161 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
주기사항  
Advisor: Revelo, Xavier.
학위논문주기  
Thesis (Ph.D.)--University of Minnesota, 2025.
초록/해제  
요약Metabolic dysfunction-associated steatohepatitis (MASH) is rapidly becoming a leading cause of liver failure and liver transplantation. Characterized by chronic inflammation, liver injury, and fibrosis, untreated MASH can progress to cirrhosis and liver cancer. While hepatic inflammation is a key feature, the immune pathways involved are poorly understood. B cells are adaptive immune cells that produce antibodies, pro- and anti-inflammatory cytokines, and modulate the activation and function of other immune cells. Recently emerging as central mediators of MASH progression, their role in disease is incompletely understood. Using a diet-induced murine model of MASH, this thesis investigates the role of B cells in MASH pathogenesis and uncovers the mechanisms leading to their activation.Using single-cell immune profiling and bulk RNA sequencing, MASH livers were found to accumulate B cells with elevated pro-inflammatory cytokine secretion, antigen presentation, and immunoglobulin production. B-cell activation was driven by a synergy between innate signaling via myeloid differentiation primary response protein 88 (MyD88) and adaptive mechanisms involving B cell-receptor signaling. Deletion of MyD88 in B cells reduced hepatic inflammation and fibrosis, while fecal microbiota transplantation from MASLD patients to lean mice promoted steatosis and B cell activation.To meet the metabolic demands of their activation and effector responses, these B cells rely on oxidative phosphorylation driven selectively by pyruvate oxidation. Genetic deletion or pharmacological inhibition of the mitochondrial pyruvate carrier (MPC) in B cells significantly reduced their inflammatory cytokine and IgG production, ameliorating hepatic steatosis, inflammation, and fibrosis.Using B cell receptor (BCR) sequencing, B cells were found to have reduced clonal expansion but heightened clonal diversity in MASH livers, indicative of polyclonal activation whereby multiple antigens simultaneously stimulated diverse B cell clones. Accordingly, mice engineered to express a transgenic BCR specific to a single irrelevant antigen exhibited suppressed B cell effector responses, reduced T cell- and macrophage-mediated inflammation, and improved hepatic outcomes, highlighting the contribution of polyclonal B cell activation to MASH progression. Mechanistically, this thesis identifies a novel pathway whereby IgG produced by B cells directly activates hepatic stellates driving fibrotic remodeling in MASH.Collectively, these findings position polyclonal B cell activation, pyruvate oxidation, and IgG as central mediators of MASH pathology. By identifying the BCR, Myd88, mitochondrial pyruvate carrier, and MASLD-associated gut microbiota as key regulators of B cell metabolic and inflammatory functions, this thesis provides insights into novel therapeutic targets for treating MASH.
일반주제명  
Immunology
일반주제명  
Physiology
일반주제명  
Cellular biology
키워드  
B cells
키워드  
Fibrosis
키워드  
Inflammation
키워드  
Liver transplantation
키워드  
Metabolic dysfunction-associated steatohepatitis
키워드  
Metabolism
기타저자  
University of Minnesota Integrative Biology and Physiology
기본자료저록  
Dissertations Abstracts International. 86-12B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aBarrow,  Fanta.
■24510▼aUnveiling  the  Pathogenic  Role  of  B  Cells  in  Metabolic  Dysfunction-Associated  Steatohepatitis
■260    ▼a[Sl]▼bUniversity  of  Minnesota▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a161  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-12,  Section:  B.
■500    ▼aAdvisor:  Revelo,  Xavier.
■5021  ▼aThesis  (Ph.D.)--University  of  Minnesota,  2025.
■520    ▼aMetabolic  dysfunction-associated  steatohepatitis  (MASH)  is  rapidly  becoming  a  leading  cause  of  liver  failure  and  liver  transplantation.  Characterized  by  chronic  inflammation,  liver  injury,  and  fibrosis,  untreated  MASH  can  progress  to  cirrhosis  and  liver  cancer.  While  hepatic  inflammation  is  a  key  feature,  the  immune  pathways  involved  are  poorly  understood.  B  cells  are  adaptive  immune  cells  that  produce  antibodies,  pro-  and  anti-inflammatory  cytokines,  and  modulate  the  activation  and  function  of  other  immune  cells.  Recently  emerging  as  central  mediators  of  MASH  progression,  their  role  in  disease  is  incompletely  understood.  Using  a  diet-induced  murine  model  of  MASH,  this  thesis  investigates  the  role  of  B  cells  in  MASH  pathogenesis  and  uncovers  the  mechanisms  leading  to  their  activation.Using  single-cell  immune  profiling  and  bulk  RNA  sequencing,  MASH  livers  were  found  to  accumulate  B  cells  with  elevated  pro-inflammatory  cytokine  secretion,  antigen  presentation,  and  immunoglobulin  production.  B-cell  activation  was  driven  by  a  synergy  between  innate  signaling  via  myeloid  differentiation  primary  response  protein  88  (MyD88)  and  adaptive  mechanisms  involving  B  cell-receptor  signaling.  Deletion  of  MyD88  in  B  cells  reduced  hepatic  inflammation  and  fibrosis,  while  fecal  microbiota  transplantation  from  MASLD  patients  to  lean  mice  promoted  steatosis  and  B  cell  activation.To  meet  the  metabolic  demands  of  their  activation  and  effector  responses,  these  B  cells  rely  on  oxidative  phosphorylation  driven  selectively  by  pyruvate  oxidation.  Genetic  deletion  or  pharmacological  inhibition  of  the  mitochondrial  pyruvate  carrier  (MPC)  in  B  cells  significantly  reduced  their  inflammatory  cytokine  and  IgG  production,  ameliorating  hepatic  steatosis,  inflammation,  and  fibrosis.Using  B  cell  receptor  (BCR)  sequencing,  B  cells  were  found  to  have  reduced  clonal  expansion  but  heightened  clonal  diversity  in  MASH  livers,  indicative  of  polyclonal  activation  whereby  multiple  antigens  simultaneously  stimulated  diverse  B  cell  clones.  Accordingly,  mice  engineered  to  express  a  transgenic  BCR  specific  to  a  single  irrelevant  antigen  exhibited  suppressed  B  cell  effector  responses,  reduced  T  cell-  and  macrophage-mediated  inflammation,  and  improved  hepatic  outcomes,  highlighting  the  contribution  of  polyclonal  B  cell  activation  to  MASH  progression.  Mechanistically,  this  thesis  identifies  a  novel  pathway  whereby  IgG  produced  by  B  cells  directly  activates  hepatic  stellates  driving  fibrotic  remodeling  in  MASH.Collectively,  these  findings  position  polyclonal  B  cell  activation,  pyruvate  oxidation,  and  IgG  as  central  mediators  of  MASH  pathology.  By  identifying  the  BCR,  Myd88,  mitochondrial  pyruvate  carrier,  and  MASLD-associated  gut  microbiota  as  key  regulators  of  B  cell  metabolic  and  inflammatory  functions,  this  thesis  provides  insights  into  novel  therapeutic  targets  for  treating  MASH.
■590    ▼aSchool  code:  0130.
■650  4▼aImmunology
■650  4▼aPhysiology
■650  4▼aCellular  biology
■653    ▼aB  cells
■653    ▼aFibrosis
■653    ▼aInflammation
■653    ▼aLiver  transplantation
■653    ▼aMetabolic  dysfunction-associated  steatohepatitis
■653    ▼aMetabolism
■690    ▼a0982
■690    ▼a0719
■690    ▼a0769
■690    ▼a0379
■71020▼aUniversity  of  Minnesota▼bIntegrative  Biology  and  Physiology.
■7730  ▼tDissertations  Abstracts  International▼g86-12B.
■790    ▼a0130
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357718▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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