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Roles of TRAF3 in Regulation of T Lymphocyte Biology- [electronic resource]
Roles of TRAF3 in Regulation of T Lymphocyte Biology - [electronic resource]
Roles of TRAF3 in Regulation of T Lymphocyte Biology- [electronic resource]

상세정보

자료유형  
 학위논문파일 국외
최종처리일시  
20240214095912
ISBN  
9798379785253
DDC  
616.079
저자명  
Arkee, Tina.
서명/저자  
Roles of TRAF3 in Regulation of T Lymphocyte Biology - [electronic resource]
발행사항  
[S.l.]: : The University of Iowa., 2023
발행사항  
Ann Arbor : : ProQuest Dissertations & Theses,, 2023
형태사항  
1 online resource(196 p.)
주기사항  
Source: Dissertations Abstracts International, Volume: 85-01, Section: B.
주기사항  
Advisor: Bishop, Gail A. .
학위논문주기  
Thesis (Ph.D.)--The University of Iowa, 2023.
사용제한주기  
This item must not be sold to any third party vendors.
초록/해제  
요약The versatile intracellular adaptor protein Tumor necrosis factor receptor (TNFR) associated factor 3 (TRAF3) plays an important role in T cell biology. Mice with T cell-specific TRAF3 deficiency (T-Traf3-/- ) have normal numbers of conventional T cells, but fail to clear infection with sublethal doses of the intracellular pathogen Listeria monocytogenes, and do not mount an effective antibody response following immunization with a T-dependent antigen. Further examination of TRAF3-/- T cells revealed that defective T cell receptor (TCR)/CD28- mediated signaling, and subsequently impaired proliferation and cytokine production, contribute to the failure of T-Traf3-/- mice to mount effective immune responses upon antigenic challenge.TRAF3 is recruited to the TCR/CD28 complex upon engagement of both CD3 and CD28, and enhances TCR/CD28 signaling. The studies described in Chapters 3 and 4 of this dissertation show that TRAF3 is recruited to the TCR/CD28 complex via interactions with the adaptor protein Linker for activated T cells (LAT), promoting TCR/CD28 signaling via restraint of the LAT-associated negative regulator Downstream of kinase 1 (Dok1). The interaction between TRAF3 and LAT requires the TRAF-C domain of TRAF3, as well as a TRAF2/3 binding motif in LAT that we newly identified. TRAF3-mediated restraint of Dok1 activity and stability requires activation of Breast tumor kinase (Brk), the tyrosine kinase responsible for inhibitory phosphorylation of Dok1. The sustained activity of Dok1 in TRAF3-/- T cells is due to enhanced dephosphorylation of Brk at an activating tyrosine residue by the tyrosine phosphatase Protein tyrosine phosphatase 1B (PTP1B). The role of PTP1B in negative regulation of Brk activation and TCR/CD28 signaling was confirmed by pharmacological inhibition of PTP1B, which increased phosphorylation of Brk at an activating tyrosine residue and restored TCR/CD28-mediated Src family kinase activation in TRAF3-/- T cells. These results identify a novel mechanism of TRAF3-mediated regulation of TCR/CD28 signaling.TCR/CD28 signaling promotes T cell metabolic reprogramming and cell fate decisions via activation of Mammalian target of rapamycin (mTOR). In Chapter 5, we hypothesized that both T cell metabolism and T cell fate decisions would be altered in TRAF3-/- T cells. Interestingly, TRAF3 deficiency impacted expression of molecules involved in amino acid uptake and catabolism, subsequently impairing TCR/CD28-mediated activation of mTOR. This is reflected by altered phosphorylation of p70S6K and Akt S473, targets of mTORC1 and mTORC2, respectively. As mTOR activity impacts T cell fate decisions, we examined CD4 T helper subset differentiation, finding that differentiation into TH1, TH2, and TH17 subsets was reduced in the absence of TRAF3. Consistent with defective TH2 differentiation, activation of STAT6 was reduced in CD3/CD28-stimulated TRAF3-/- T cells, although early IL-4R signaling was normal. These findings suggest that TRAF3 regulates TH2 differentiation via IL-4- independent mechanisms of GATA3 upregulation.In Chapter 6, we tested the prediction that TRAF3 is a resident nuclear protein in T cells. Consistent with this prediction, TRAF3 was present in the nuclear fraction of resting human and mouse T cells. TRAF3 translocated to the nuclear fraction upon stimulation through CD3/CD28, and regulated the nuclear localization of TRAF2, as there was more TRAF2 in the nuclear fraction in resting and CD3/CD28-stimulated TRAF3-/- T cells. These findings suggest that nuclear TRAF3 promotes T cell function via regulation of TRAF2/cellular inhibitor of apoptosis protein (cIAP)-mediated degradation of target proteins. Taken together, the findings presented in this dissertation provide significant new insights into the mechanisms by which TRAF3 uniquely regulates T cell activation, fate, and function, and have implications for the manipulation of T cell function for therapeutic purposes.
일반주제명  
Immunology.
일반주제명  
Cellular biology.
일반주제명  
Biology.
키워드  
Signal transduction
키워드  
T lymphocytes
키워드  
Tumor necrosis
키워드  
Mediated signaling
키워드  
Metabolic reprogramming
기타저자  
The University of Iowa Immunology
기본자료저록  
Dissertations Abstracts International. 85-01B.
기본자료저록  
Dissertation Abstract International
전자적 위치 및 접속  
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■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a616.079
■1001  ▼aArkee,  Tina.
■24510▼aRoles  of  TRAF3  in  Regulation  of  T  Lymphocyte  Biology▼h[electronic  resource]
■260    ▼a[S.l.]:▼bThe  University  of  Iowa.  ▼c2023
■260  1▼aAnn  Arbor  :▼bProQuest  Dissertations  &  Theses,  ▼c2023
■300    ▼a1  online  resource(196  p.)
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-01,  Section:  B.
■500    ▼aAdvisor:  Bishop,  Gail  A.  .
■5021  ▼aThesis  (Ph.D.)--The  University  of  Iowa,  2023.
■506    ▼aThis  item  must  not  be  sold  to  any  third  party  vendors.
■520    ▼aThe  versatile  intracellular  adaptor  protein  Tumor  necrosis  factor  receptor  (TNFR)  associated  factor  3  (TRAF3)  plays  an  important  role  in  T  cell  biology.  Mice  with  T  cell-specific  TRAF3  deficiency  (T-Traf3-/-  )  have  normal  numbers  of  conventional  T  cells,  but  fail  to  clear  infection  with  sublethal  doses  of  the  intracellular  pathogen  Listeria  monocytogenes,  and  do  not  mount  an  effective  antibody  response  following  immunization  with  a  T-dependent  antigen.  Further  examination  of  TRAF3-/-  T  cells  revealed  that  defective  T  cell  receptor  (TCR)/CD28-  mediated  signaling,  and  subsequently  impaired  proliferation  and  cytokine  production,  contribute  to  the  failure  of  T-Traf3-/-  mice  to  mount  effective  immune  responses  upon  antigenic  challenge.TRAF3  is  recruited  to  the  TCR/CD28  complex  upon  engagement  of  both  CD3  and  CD28,  and  enhances  TCR/CD28  signaling.  The  studies  described  in  Chapters  3  and  4  of  this  dissertation  show  that  TRAF3  is  recruited  to  the  TCR/CD28  complex  via  interactions  with  the  adaptor  protein  Linker  for  activated  T  cells  (LAT),  promoting  TCR/CD28  signaling  via  restraint  of  the  LAT-associated  negative  regulator  Downstream  of  kinase  1  (Dok1).  The  interaction  between  TRAF3  and  LAT  requires  the  TRAF-C  domain  of  TRAF3,  as  well  as  a  TRAF2/3  binding  motif  in  LAT  that  we  newly  identified.  TRAF3-mediated  restraint  of  Dok1  activity  and  stability  requires  activation  of  Breast  tumor  kinase  (Brk),  the  tyrosine  kinase  responsible  for  inhibitory  phosphorylation  of  Dok1.  The  sustained  activity  of  Dok1  in  TRAF3-/-  T  cells  is  due  to  enhanced  dephosphorylation  of  Brk  at  an  activating  tyrosine  residue  by  the  tyrosine  phosphatase  Protein  tyrosine  phosphatase  1B  (PTP1B).  The  role  of  PTP1B  in  negative  regulation  of  Brk  activation  and  TCR/CD28  signaling  was  confirmed  by  pharmacological  inhibition  of  PTP1B,  which  increased  phosphorylation  of  Brk  at  an  activating  tyrosine  residue  and  restored  TCR/CD28-mediated  Src  family  kinase  activation  in  TRAF3-/-  T  cells.  These  results  identify  a  novel  mechanism  of  TRAF3-mediated  regulation  of  TCR/CD28  signaling.TCR/CD28  signaling  promotes  T  cell  metabolic  reprogramming  and  cell  fate  decisions  via  activation  of  Mammalian  target  of  rapamycin  (mTOR).  In  Chapter  5,  we  hypothesized  that  both  T  cell  metabolism  and  T  cell  fate  decisions  would  be  altered  in  TRAF3-/-  T  cells.  Interestingly,  TRAF3  deficiency  impacted  expression  of  molecules  involved  in  amino  acid  uptake  and  catabolism,  subsequently  impairing  TCR/CD28-mediated  activation  of  mTOR.  This  is  reflected  by  altered  phosphorylation  of  p70S6K  and  Akt  S473,  targets  of  mTORC1  and  mTORC2,  respectively.  As  mTOR  activity  impacts  T  cell  fate  decisions,  we  examined  CD4  T  helper  subset  differentiation,  finding  that  differentiation  into  TH1,  TH2,  and  TH17  subsets  was  reduced  in  the  absence  of  TRAF3.  Consistent  with  defective  TH2  differentiation,  activation  of  STAT6  was  reduced  in  CD3/CD28-stimulated  TRAF3-/-  T  cells,  although  early  IL-4R  signaling  was  normal.  These  findings  suggest  that  TRAF3  regulates  TH2  differentiation  via  IL-4-  independent  mechanisms  of  GATA3  upregulation.In  Chapter  6,  we  tested  the  prediction  that  TRAF3  is  a  resident  nuclear  protein  in  T  cells.  Consistent  with  this  prediction,  TRAF3  was  present  in  the  nuclear  fraction  of  resting  human  and  mouse  T  cells.  TRAF3  translocated  to  the  nuclear  fraction  upon  stimulation  through  CD3/CD28,  and  regulated  the  nuclear  localization  of  TRAF2,  as  there  was  more  TRAF2  in  the  nuclear  fraction  in  resting  and  CD3/CD28-stimulated  TRAF3-/-  T  cells.  These  findings  suggest  that  nuclear  TRAF3  promotes  T  cell  function  via  regulation  of  TRAF2/cellular  inhibitor  of  apoptosis  protein  (cIAP)-mediated  degradation  of  target  proteins.  Taken  together,  the  findings  presented  in  this  dissertation  provide  significant  new  insights  into  the  mechanisms  by  which  TRAF3  uniquely regulates  T  cell  activation,  fate,  and  function,  and  have  implications  for  the  manipulation  of  T  cell  function  for  therapeutic  purposes.
■590    ▼aSchool  code:  0096.
■650  4▼aImmunology.
■650  4▼aCellular  biology.
■650  4▼aBiology.
■653    ▼aSignal  transduction
■653    ▼aT  lymphocytes
■653    ▼aTumor  necrosis
■653    ▼aMediated  signaling
■653    ▼aMetabolic  reprogramming
■690    ▼a0982
■690    ▼a0379
■690    ▼a0306
■71020▼aThe  University  of  Iowa▼bImmunology.
■7730  ▼tDissertations  Abstracts  International▼g85-01B.
■773    ▼tDissertation  Abstract  International
■790    ▼a0096
■791    ▼aPh.D.
■792    ▼a2023
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16931098▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.
■980    ▼a202402▼f2024

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