본문

서브메뉴

Protein-Level Regulation of Oncogenic RIT1 in Non-Small Cell Lung Cancer
Protein-Level Regulation of Oncogenic RIT1 in Non-Small Cell Lung Cancer
Protein-Level Regulation of Oncogenic RIT1 in Non-Small Cell Lung Cancer

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211150928
ISBN  
9798382210988
DDC  
574
저자명  
Riley, Amanda K.
서명/저자  
Protein-Level Regulation of Oncogenic RIT1 in Non-Small Cell Lung Cancer
발행사항  
[Sl] : University of Washington, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
119 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-10, Section: B.
주기사항  
Advisor: Berger, Alice H.
학위논문주기  
Thesis (Ph.D.)--University of Washington, 2024.
초록/해제  
요약Lung cancer is the leading cause of cancer-related deaths worldwide. Non-small cell lung cancer is the most diagnosed type of lung cancer, and lung adenocarcinoma is the most prevalent subtype. Approximately 50% of lung adenocarcinoma tumors harbor druggable mutations in genes such as EGFR and ALK, and targeted therapies are highly effective at reducing tumor burden. Indeed, targeted therapies have revolutionized cancer treatment and are becoming standard of care over cytotoxic chemotherapy; however, many mutations are not clinically actionable. Up to 15% of lung adenocarcinoma tumors are driven by mutation or amplification of the RAS-family gene RIT1, and RIT1 mutations do not co-occur with other canonical driver mutations. There is a growing understanding that the protein abundance of RIT1 is essential for its function. Therefore, inhibiting positive regulators of RIT1 abundance could be a tractable means of reducing tumor burden and abrogating the growth of tumors driven by RIT1 mutations and amplifications.Development of a RIT1-specific inhibitor is unlikely to succeed due to the structure of RIT1 as a GTPase. In 2013, groundbreaking work on KRAS resulted in the development of the first mutant-specific inhibitors, which represents a major advance in this field and for patient care. Such an approach for RIT1, however, would be quite difficult due to the resources required and our lack of knowledge pertaining to RIT1 biology and oncogenic mechanisms. Because of this, innovative approaches are needed to understand RIT1 genetic dependencies and uncover druggable targets.The Berger Lab developed a CRISPR screening approach to discover genes required for RIT1-driven cellular transformation. From this work, we found that RIT1-mutant cells are uniquely dependent on genes associated with the Spindle Assembly Checkpoint (SAC), including Aurora kinases A and B. RIT1-mutant cells are more sensitive than KRAS-mutant cells to alisertib (an Aurora kinase A inhibitor) and barasertib (an Aurora kinase B inhibitor). Expression of mutant RIT1 weakens the SAC, prompting cells to prematurely exit mitosis and accumulate mitotic abnormalities. In addition to the SAC vulnerability, we identified the deubiquitinase USP9X as a top essential gene in RIT1-mutant cells. This was particularly intriguing given that previous work has suggested that the protein abundance of RIT1 is important for its function. Indeed, although RIT1 shows high sequence homology to KRAS, RIT1 does not appear to be regulated in a similar manner (i.e. at the level of GAP resistance). Instead, RIT1 appears to be regulated at the level of protein abundance. Here, I explore the hypothesis that RIT1 is a substrate of USP9X and found that USP9X binds to and deubiquitinates RIT1. I find that USP9X depletion decreases RIT1 protein abundance and stability, and loss of USP9X abrogates RIT1-driven cell growth and proliferation. These findings increase our understanding of RIT1 biology and oncogenic mechanisms and nominate USP9X as a therapeutic target for the treatment of RIT1-driven diseases.
일반주제명  
Cellular biology
일반주제명  
Oncology
일반주제명  
Molecular biology
키워드  
Deubiquitinase
키워드  
Lung cancer
키워드  
Genes
키워드  
Oncogenic mechanisms
키워드  
Mutations
기타저자  
University of Washington Molecular and Cellular Biology
기본자료저록  
Dissertations Abstracts International. 85-10B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

 008250123s2024        us                              c    eng  d
■001000017160184
■00520250211150928
■006m          o    d                
■007cr#unu||||||||
■020    ▼a9798382210988
■035    ▼a(MiAaPQ)AAI30989802
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a574
■1001  ▼aRiley,  Amanda  K.
■24510▼aProtein-Level  Regulation  of  Oncogenic  RIT1  in  Non-Small  Cell  Lung  Cancer
■260    ▼a[Sl]▼bUniversity  of  Washington▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a119  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-10,  Section:  B.
■500    ▼aAdvisor:  Berger,  Alice  H.
■5021  ▼aThesis  (Ph.D.)--University  of  Washington,  2024.
■520    ▼aLung  cancer  is  the  leading  cause  of  cancer-related  deaths  worldwide.  Non-small  cell  lung  cancer  is  the  most  diagnosed  type  of  lung  cancer,  and  lung  adenocarcinoma  is  the  most  prevalent  subtype.  Approximately  50%  of  lung  adenocarcinoma  tumors  harbor  druggable  mutations  in  genes  such  as  EGFR  and  ALK,  and  targeted  therapies  are  highly  effective  at  reducing  tumor  burden.  Indeed,  targeted  therapies  have  revolutionized  cancer  treatment  and  are  becoming  standard  of  care  over  cytotoxic  chemotherapy;  however,  many  mutations  are  not  clinically  actionable.  Up  to  15%  of  lung  adenocarcinoma  tumors  are  driven  by  mutation  or  amplification  of  the  RAS-family  gene  RIT1,  and  RIT1  mutations  do  not  co-occur  with  other  canonical  driver  mutations.  There  is  a  growing  understanding  that  the  protein  abundance  of  RIT1  is  essential  for  its  function.  Therefore,  inhibiting  positive  regulators  of  RIT1  abundance  could  be  a  tractable  means  of  reducing  tumor  burden  and  abrogating  the  growth  of  tumors  driven  by  RIT1  mutations  and  amplifications.Development  of  a  RIT1-specific  inhibitor  is  unlikely  to  succeed  due  to  the  structure  of  RIT1  as  a  GTPase.  In  2013,  groundbreaking  work  on  KRAS  resulted  in  the  development  of  the  first  mutant-specific  inhibitors,  which  represents  a  major  advance  in  this  field  and  for  patient  care.  Such  an  approach  for  RIT1,  however,  would  be  quite  difficult  due  to  the  resources  required  and  our  lack  of  knowledge  pertaining  to  RIT1  biology  and  oncogenic  mechanisms.  Because  of  this,  innovative  approaches  are  needed  to  understand  RIT1  genetic  dependencies  and  uncover  druggable  targets.The  Berger  Lab  developed  a  CRISPR  screening  approach  to  discover  genes  required  for  RIT1-driven  cellular  transformation.  From  this  work,  we  found  that  RIT1-mutant  cells  are  uniquely  dependent  on  genes  associated  with  the  Spindle  Assembly  Checkpoint  (SAC),  including  Aurora  kinases  A  and  B.  RIT1-mutant  cells  are  more  sensitive  than  KRAS-mutant  cells  to  alisertib  (an  Aurora  kinase  A  inhibitor)  and  barasertib  (an  Aurora  kinase  B  inhibitor).  Expression  of  mutant  RIT1  weakens  the  SAC,  prompting  cells  to  prematurely  exit  mitosis  and  accumulate  mitotic  abnormalities.  In  addition  to  the  SAC  vulnerability,  we  identified  the  deubiquitinase  USP9X  as  a  top  essential  gene  in  RIT1-mutant  cells.  This  was  particularly  intriguing  given  that  previous  work  has  suggested  that  the  protein  abundance  of  RIT1  is  important  for  its  function.  Indeed,  although  RIT1  shows  high  sequence  homology  to  KRAS,  RIT1  does  not  appear  to  be  regulated  in  a  similar  manner  (i.e.  at  the  level  of  GAP  resistance).  Instead,  RIT1  appears  to  be  regulated  at  the  level  of  protein  abundance. Here,  I  explore  the  hypothesis  that  RIT1  is  a  substrate  of  USP9X  and  found  that  USP9X  binds  to  and  deubiquitinates  RIT1.  I  find  that  USP9X  depletion  decreases  RIT1  protein  abundance  and  stability,  and  loss  of  USP9X  abrogates  RIT1-driven  cell  growth  and  proliferation. These  findings  increase  our  understanding  of  RIT1  biology  and  oncogenic  mechanisms  and  nominate  USP9X  as  a  therapeutic  target  for  the  treatment  of  RIT1-driven  diseases.
■590    ▼aSchool  code:  0250.
■650  4▼aCellular  biology
■650  4▼aOncology
■650  4▼aMolecular  biology
■653    ▼aDeubiquitinase
■653    ▼aLung  cancer
■653    ▼aGenes
■653    ▼aOncogenic  mechanisms
■653    ▼aMutations
■690    ▼a0379
■690    ▼a0992
■690    ▼a0307
■71020▼aUniversity  of  Washington▼bMolecular  and  Cellular  Biology.
■7730  ▼tDissertations  Abstracts  International▼g85-10B.
■790    ▼a0250
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17160184▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

미리보기

내보내기

chatGPT토론

Ai 추천 관련 도서


    신착도서 더보기
    최근 3년간 통계입니다.

    소장정보

    • 예약
    • 소재불명신고
    • 나의폴더
    • 우선정리요청
    • 비도서대출신청
    • 야간 도서대출신청
    소장자료
    등록번호 청구기호 소장처 대출가능여부 대출정보
    TF10382 전자도서 대출가능 마이폴더 부재도서신고 비도서대출신청 야간 도서대출신청

    * 대출중인 자료에 한하여 예약이 가능합니다. 예약을 원하시면 예약버튼을 클릭하십시오.

    해당 도서를 다른 이용자가 함께 대출한 도서

    관련 인기도서

    로그인 후 이용 가능합니다.