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The Role of the Lysine Deacetylase Sirtuin 1 in Regulating RNA Stability and the Production of a Secretome That Promotes Breast Cancer
The Role of the Lysine Deacetylase Sirtuin 1 in Regulating RNA Stability and the Productio...
The Role of the Lysine Deacetylase Sirtuin 1 in Regulating RNA Stability and the Production of a Secretome That Promotes Breast Cancer

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자료유형  
 학위논문 서양
최종처리일시  
20250211151954
ISBN  
9798384047650
DDC  
574
저자명  
Wang, Fangyu.
서명/저자  
The Role of the Lysine Deacetylase Sirtuin 1 in Regulating RNA Stability and the Production of a Secretome That Promotes Breast Cancer
발행사항  
[Sl] : Cornell University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
188 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
주기사항  
Advisor: Cerione, Richard.
학위논문주기  
Thesis (Ph.D.)--Cornell University, 2024.
초록/해제  
요약Sirtuin 1 (SIRT1) is a NAD+-dependent lysine deacetylase that has emerged as an important enzyme involved in various physiological and pathological conditions, including cancer. Decreased levels of SIRT1 expression in aggressive forms of breast cancer have been shown to increase the production of a major class of extracellular vesicles (EVs) that are derived from multivesicular bodies (MVBs) in the endo-lysosomal degradation pathway, referred to as exosomes. These vesicles were shown to contain unique cargo that can be transferred to other cancer cells, stimulating their growth and invasion. However, the mechanism by which the loss of SIRT1 expression causes this effect was poorly understood.In Chapter 2, I describe a novel mechanism by which SIRT1 regulates the stability of the RNA transcript that encodes ATP6V1A, a major catalytic subunit of the vacuolar ATPase (v-ATPase) that controls lysosomal activity. Specifically, I found that depleting highly aggressive breast cancer cells of SIRT1 using shRNA results in the increased acetylation of the RNA binding protein, insulin-like growth factor 2 messenger RNA binding protein 2 (IGF2BP2). Upon binding to the 3' untranslated region (3' UTR) of the ATP6V1A transcript, the acetylated form of IGF2BP2 recruits the XRN2 exonuclease to promote the degradation of the ATP6V1A transcript. The corresponding reduction in ATP6V1A protein levels impairs lysosomal activity and causes multi-vesicular bodies that would otherwise be delivered to lysosomes where much of their contents are degraded, to instead fuse with the plasma membrane and thus shed their intraluminal vesicles (i.e., exosomes) into the extracellular environment.I also discovered that SIRT1 and IGF2BP2 can similarly regulate the stability of several additional RNA transcripts, including the extracellular matrix protein and recently described tumor suppressor, tubulointerstitial nephritis antigen like 1 (TINAGL1). I showed that TINAGL1 is secreted from cells associated with exosomes, and that depleting cells of SIRT1 inhibits the amount of TINAGL1 in the exosomes released by cells. The resultant secretome lacking this tumor suppressor was shown to promote cell migration. Collectively, these findings shed new light on a previously unappreciated role for SIRT1 in regulating mRNA stability and the production of a secretome that has important consequences in aggressive breast cancer progression.
일반주제명  
Cellular biology
일반주제명  
Biochemistry
일반주제명  
Molecular biology
일반주제명  
Oncology
키워드  
Breast cancer
키워드  
Extracellular vesicles
키워드  
RNA binding protein
키워드  
RNA stability
키워드  
Sirtuin 1
키워드  
Insulin-like growth factor 2 messenger RNA binding protein 2
기타저자  
Cornell University Biochemistry Molecular and Cell Biology
기본자료저록  
Dissertations Abstracts International. 86-03B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aWang,  Fangyu.▼0(orcid)0000-0002-6388-1461
■24510▼aThe  Role  of  the  Lysine  Deacetylase  Sirtuin  1  in  Regulating  RNA  Stability  and  the  Production  of  a  Secretome  That  Promotes  Breast  Cancer
■260    ▼a[Sl]▼bCornell  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a188  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-03,  Section:  B.
■500    ▼aAdvisor:  Cerione,  Richard.
■5021  ▼aThesis  (Ph.D.)--Cornell  University,  2024.
■520    ▼aSirtuin  1  (SIRT1)  is  a  NAD+-dependent  lysine  deacetylase  that  has  emerged  as  an  important  enzyme  involved  in  various  physiological  and  pathological  conditions,  including  cancer.  Decreased  levels  of  SIRT1  expression  in  aggressive  forms  of  breast  cancer  have  been  shown  to  increase  the  production  of  a  major  class  of  extracellular  vesicles  (EVs)  that  are  derived  from  multivesicular  bodies  (MVBs)  in  the  endo-lysosomal  degradation  pathway,  referred  to  as  exosomes.  These  vesicles  were  shown  to  contain  unique  cargo  that  can  be  transferred  to  other  cancer  cells,  stimulating  their  growth  and  invasion.  However,  the  mechanism  by  which  the  loss  of  SIRT1  expression  causes  this  effect  was  poorly  understood.In  Chapter  2,  I  describe  a  novel  mechanism  by  which  SIRT1  regulates  the  stability  of  the  RNA  transcript  that  encodes  ATP6V1A,  a  major  catalytic  subunit  of  the  vacuolar  ATPase  (v-ATPase)  that  controls  lysosomal  activity.  Specifically,  I  found  that  depleting  highly  aggressive  breast  cancer  cells  of  SIRT1  using  shRNA  results  in  the  increased  acetylation  of  the  RNA  binding  protein,  insulin-like  growth  factor  2  messenger  RNA  binding  protein  2  (IGF2BP2).  Upon  binding  to  the  3'  untranslated  region  (3'  UTR)  of  the  ATP6V1A  transcript,  the  acetylated  form  of  IGF2BP2  recruits  the  XRN2  exonuclease  to  promote  the  degradation  of  the  ATP6V1A  transcript.  The  corresponding  reduction  in  ATP6V1A  protein  levels  impairs  lysosomal  activity  and  causes  multi-vesicular  bodies  that  would  otherwise  be  delivered  to  lysosomes  where  much  of  their  contents  are  degraded,  to  instead  fuse  with  the  plasma  membrane  and  thus  shed  their  intraluminal  vesicles  (i.e.,  exosomes)  into  the  extracellular  environment.I  also  discovered  that  SIRT1  and  IGF2BP2  can  similarly  regulate  the  stability  of  several  additional  RNA  transcripts,  including  the  extracellular  matrix  protein  and  recently  described  tumor  suppressor,  tubulointerstitial  nephritis  antigen  like  1  (TINAGL1).  I  showed  that  TINAGL1  is  secreted  from  cells  associated  with  exosomes,  and  that  depleting  cells  of  SIRT1  inhibits  the  amount  of  TINAGL1  in  the  exosomes  released  by  cells.  The  resultant  secretome  lacking  this  tumor  suppressor  was  shown  to  promote  cell  migration.  Collectively,  these  findings  shed  new  light  on  a  previously  unappreciated  role  for  SIRT1  in  regulating  mRNA  stability  and  the  production  of  a  secretome  that  has  important  consequences  in  aggressive  breast  cancer  progression.
■590    ▼aSchool  code:  0058.
■650  4▼aCellular  biology
■650  4▼aBiochemistry
■650  4▼aMolecular  biology
■650  4▼aOncology
■653    ▼aBreast  cancer
■653    ▼aExtracellular  vesicles
■653    ▼aRNA  binding  protein
■653    ▼aRNA  stability
■653    ▼aSirtuin  1
■653    ▼aInsulin-like  growth  factor  2  messenger  RNA  binding  protein  2
■690    ▼a0379
■690    ▼a0487
■690    ▼a0307
■690    ▼a0992
■71020▼aCornell  University▼bBiochemistry,  Molecular  and  Cell  Biology.
■7730  ▼tDissertations  Abstracts  International▼g86-03B.
■790    ▼a0058
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162280▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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