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Investigating Tumor-Stroma Interactions During Ovarian Cancer Metastasis
Investigating Tumor-Stroma Interactions During Ovarian Cancer Metastasis
Investigating Tumor-Stroma Interactions During Ovarian Cancer Metastasis

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211151154
ISBN  
9798382307800
DDC  
574
저자명  
Schab, Angela Marie.
서명/저자  
Investigating Tumor-Stroma Interactions During Ovarian Cancer Metastasis
발행사항  
[Sl] : Washington University in St Louis, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
232 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-10, Section: B.
주기사항  
Advisor: Longmore, Gregory;Fuh, Katherine.
학위논문주기  
Thesis (Ph.D.)--Washington University in St. Louis, 2024.
초록/해제  
요약The majority of ovarian cancer patients have metastatic disease throughout the peritoneal cavity at the time of diagnosis, at which point the five-year survival is only around 30%. However, no effective therapy exists to prevent or treat ovarian cancer metastasis. To implant into the peritoneal cavity, ovarian cancer cells must attach to the mesothelial cell layer-a monolayer of cells that surrounds all organs of the peritoneal cavity- clear the mesothelial cell layer and invade into the underlying stroma, which hosts fibroblasts and extracellular matrix (ECM). The tumor microenvironment (TME) plays an important role in supporting metastasis and thus is a crucial area of study for potential targets to treat or prevent metastasis.Our investigations begin by testing the hypothesis that stromal cell discoidin domain receptor 2 (DDR2) promotes ovarian cancer metastasis. DDR2 is a receptor tyrosine kinase whose ligand is collagen, which is the most abundant ECM protein in the ovarian TME. We find that high stromal cell DDR2 expression correlates with poor overall survival of ovarian cancer patients. Using global Ddr2 knockout mice we demonstrate that stromal cell DDR2 promotes ovarian cancer in a syngeneic ovarian cancer mouse model. In cell-based assays we find fibroblast expression of DDR2 promotes tumor cell invasion via the secreted collagen remodeling protein LOXL2. We propose a mechanism by which DDR2 is required in fibroblasts in order to meet the energetic demands and increased protein production necessary to create a pro-metastatic ECM. We then explore DDR2 expression in mesothelial cells finding DDR2 expression promotes tumor cell attachment, clearance, and contributes to stabilizing a pro-metastatic mesenchymal state in mesothelial cells. We also find that DDR2 can have these effects even without stimulation by collagen, and thus begin to explore ligand-independent effects of DDR2. This will be an important area to further study so inhibitors that target all DDR2 functions can be developed.To understand whether mesothelial cell DDR2 expression promotes ovarian cancer metastasis we made, validated, and utilized a mesothelial cell specific Ddr2 knockout mouse model. Although we were unable to demonstrate significant differences in ovarian cancer tumor burden between wild type and knockout, this mouse model will be instrumental to answering future questions surrounding the contribution of mesothelial cells to ovarian cancer metastasis.We also investigated the role of tumor cell secreted factors' ability to influence mesothelial cells during metastasis concluding that mesothelial cells exposed to tumor cell secreted factors demonstrate increased clearance. The mesothelial cells undergo transcriptional and translational changes after exposure to condition media, with enrichment of epithelial-to-mesenchymal associated genes. Future directions include identifying if tumor cell secreted factors promote attachment to the mesothelial cell layer using a microfluidic device that we have optimized to address this question, identifying specific secreted factor(s) that result in functional changes in mesothelial cells and exploring pathways in mesothelial cells that have a functional response after exposure to tumor cell secreted factors.Overall, we enhance our understanding of how the tumor microenvironment is influencing ovarian cancer metastasis, identifying DDR2 as a potential target, and developed tools to better address future questions on tumor-stroma interactions in ovarian cancer.
일반주제명  
Cellular biology
일반주제명  
Oncology
일반주제명  
Molecular biology
키워드  
Cancer biology
키워드  
Discoidin domain receptor 2
키워드  
Fibroblasts
키워드  
Mesothelial cells
키워드  
Ovarian cancer
키워드  
Tumor microenvironment
기타저자  
Washington University in St. Louis Biology & Biomedical Sciences (Molecular Cell Biology)
기본자료저록  
Dissertations Abstracts International. 85-10B.
전자적 위치 및 접속  
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MARC

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■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a574
■1001  ▼aSchab,  Angela  Marie.▼0(orcid)0000-0003-1569-2452
■24510▼aInvestigating  Tumor-Stroma  Interactions  During  Ovarian  Cancer  Metastasis
■260    ▼a[Sl]▼bWashington  University  in  St  Louis▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a232  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-10,  Section:  B.
■500    ▼aAdvisor:  Longmore,  Gregory;Fuh,  Katherine.
■5021  ▼aThesis  (Ph.D.)--Washington  University  in  St.  Louis,  2024.
■520    ▼aThe  majority  of  ovarian  cancer  patients  have  metastatic  disease  throughout  the  peritoneal  cavity  at  the  time  of  diagnosis,  at  which  point  the  five-year  survival  is  only  around  30%.  However,  no  effective  therapy  exists  to  prevent  or  treat  ovarian  cancer  metastasis.  To  implant  into  the  peritoneal  cavity,  ovarian  cancer  cells  must  attach  to  the  mesothelial  cell  layer-a  monolayer  of  cells  that  surrounds  all  organs  of  the  peritoneal  cavity-  clear  the  mesothelial  cell  layer  and  invade  into  the  underlying  stroma,  which  hosts  fibroblasts  and  extracellular  matrix  (ECM).  The  tumor  microenvironment  (TME)  plays  an  important  role  in  supporting  metastasis  and  thus  is  a  crucial  area  of  study  for  potential  targets  to  treat  or  prevent  metastasis.Our  investigations  begin  by  testing  the  hypothesis  that  stromal  cell  discoidin  domain  receptor  2  (DDR2)  promotes  ovarian  cancer  metastasis.  DDR2  is  a  receptor  tyrosine  kinase  whose  ligand  is  collagen,  which  is  the  most  abundant  ECM  protein  in  the  ovarian  TME.  We  find  that  high  stromal  cell  DDR2  expression  correlates  with  poor  overall  survival  of  ovarian  cancer patients.  Using  global  Ddr2  knockout  mice  we  demonstrate  that  stromal  cell  DDR2  promotes  ovarian  cancer  in  a  syngeneic  ovarian  cancer  mouse  model.  In  cell-based  assays  we  find  fibroblast  expression  of  DDR2  promotes  tumor  cell  invasion  via  the  secreted  collagen  remodeling  protein  LOXL2.  We  propose  a  mechanism  by  which  DDR2  is  required  in  fibroblasts  in  order  to  meet  the  energetic  demands  and  increased  protein  production  necessary  to  create  a  pro-metastatic  ECM.  We  then  explore  DDR2  expression  in  mesothelial  cells  finding  DDR2  expression  promotes  tumor  cell  attachment,  clearance,  and  contributes  to  stabilizing  a  pro-metastatic  mesenchymal  state  in  mesothelial  cells.  We  also  find  that  DDR2  can  have  these  effects  even  without  stimulation  by  collagen,  and  thus  begin  to  explore  ligand-independent  effects  of  DDR2.  This  will  be  an  important  area  to  further  study  so  inhibitors  that  target  all  DDR2  functions  can  be  developed.To  understand  whether  mesothelial  cell  DDR2  expression  promotes  ovarian  cancer  metastasis  we  made,  validated,  and  utilized  a  mesothelial  cell  specific  Ddr2  knockout  mouse  model.  Although  we  were  unable  to  demonstrate  significant  differences  in  ovarian  cancer  tumor  burden  between  wild  type  and  knockout,  this  mouse  model  will  be  instrumental  to  answering  future  questions  surrounding  the  contribution  of  mesothelial  cells  to  ovarian  cancer  metastasis.We  also  investigated  the  role  of  tumor  cell  secreted  factors'  ability  to  influence  mesothelial  cells  during  metastasis  concluding  that  mesothelial  cells  exposed  to  tumor  cell  secreted  factors  demonstrate  increased  clearance.  The  mesothelial  cells  undergo  transcriptional  and  translational  changes  after  exposure  to  condition  media,  with  enrichment  of  epithelial-to-mesenchymal  associated  genes.  Future  directions  include  identifying  if  tumor  cell  secreted  factors  promote  attachment  to  the  mesothelial  cell  layer  using  a  microfluidic  device  that  we  have  optimized  to  address  this  question,  identifying  specific  secreted  factor(s)  that  result  in  functional  changes  in  mesothelial  cells  and  exploring  pathways  in  mesothelial  cells  that  have  a  functional  response  after  exposure  to  tumor  cell  secreted  factors.Overall,  we  enhance  our  understanding  of  how  the  tumor  microenvironment  is  influencing  ovarian  cancer  metastasis,  identifying  DDR2  as  a  potential  target,  and  developed  tools  to  better  address  future  questions  on  tumor-stroma  interactions  in  ovarian  cancer.
■590    ▼aSchool  code:  0252.
■650  4▼aCellular  biology
■650  4▼aOncology
■650  4▼aMolecular  biology
■653    ▼aCancer  biology
■653    ▼aDiscoidin  domain  receptor  2
■653    ▼aFibroblasts
■653    ▼aMesothelial  cells
■653    ▼aOvarian  cancer
■653    ▼aTumor  microenvironment
■690    ▼a0379
■690    ▼a0992
■690    ▼a0307
■71020▼aWashington  University  in  St.  Louis▼bBiology  &  Biomedical  Sciences  (Molecular  Cell  Biology).
■7730  ▼tDissertations  Abstracts  International▼g85-10B.
■790    ▼a0252
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17161043▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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