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Distinct Tumor Cell State Transitions Driven by Epigenetic Factors Contribute to Basal Cell Carcinoma Therapy Resistance
Distinct Tumor Cell State Transitions Driven by Epigenetic Factors Contribute to Basal Cel...
Distinct Tumor Cell State Transitions Driven by Epigenetic Factors Contribute to Basal Cell Carcinoma Therapy Resistance

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202104739
ISBN  
9798290652672
DDC  
570
저자명  
Li, Nancy Yanzhe.
서명/저자  
Distinct Tumor Cell State Transitions Driven by Epigenetic Factors Contribute to Basal Cell Carcinoma Therapy Resistance
발행사항  
[Sl] : Stanford University, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
142 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
주기사항  
Advisor: Oro, Anthony.
학위논문주기  
Thesis (Ph.D.)--Stanford University, 2025.
초록/해제  
요약Overcoming tumor evolution and therapy resistance remains the main challenge to creating successful anti-tumor therapies. Basal cell carcinoma (BCC) is not only the most common type of skin cancer but also the most common cancer, making it an ideal model for investigating tumor evolution and tumor cell state transition due to the availability of patient samples and the feasibility to track disease progression over time.The skin is composed of multiple epithelial components such as the interfollicular epidermis (IFE) and hair follicle (HF), which drive normal tissue homeostasis and regenerative processes. Although the processes that govern normal epithelial stem cell function are tightly governed, stem cell function can be misregulated and lead to cancer. BCC tumor growth is driven by sonic hedgehog (SHH) signaling, a critical developmental and regenerative signaling pathway. SHH signaling is driven by the binding of hedgehog (HH) ligands to the PTCHD1 receptor, leading to loss of the repression on smoothened (SMO), driving the translocation of the transcription factor GLI1 into the nucleus, which subsequently drives the growth and proliferative processes associated with tumorigenesis. SMO inhibitors (SMOi) like Vismodegib have been used to treat patients with locally advanced disease, however, in many cases, SMOihave either been (1) ineffective or (2) provide temporary inhibition of tumor growth before developing resistance.Various mechanisms underlie BCC therapy resistance. Genetic mutations of SMO account for around 50% of resistance cases where gain-of-function mutations render Hh signaling constitutively active despite the presence of SMOi. Epigenetic factors account for the other 50% of resistance cases where cell-autonomous or environmental changes contribute to pathway switching that renders BCCs independent of Hh signaling for survival along with the activation of alternative pathways.Here, we focused on identifying and deeply elucidating novel epigenetic mechanisms that BCCs undertake to achieve therapy resistance. We identified two distinct developmental trajectories that BCCs could undertake prior to SMOitherapy that confer a selective advantage during therapy. Chapter 1 will focus on basal-to-squamous cell carcinoma transition (BST) as a carcinoma tumor-intrinsic resistance pathway driven by activation of AP-1 family of transcription factors. Chapter 2 will focus on basal-to-inflammatory transition (BIT) as an environmentally-induced resistance pathway driven by NF-kB signaling in tumor epithelia that are associated with a specialized inflammatory environment defined by a TREM1 myeloid signature. While both resistance pathways are characterized by reversible tumor cell state changes, the induced tumor cell states display distinct markers for identification, are localized in distinct spatial neighborhoods within the tumor, and are driven by distinct epigenetic pathways. Our work provides critical insights into both BST and BIT resistant states as novel targetable tumor states that provide unique therapeutic opportunities to overcome tumor resistance.
일반주제명  
Growth factors
일반주제명  
Cells
일반주제명  
Gene expression
일반주제명  
Cancer therapies
일반주제명  
Cloning
일반주제명  
Follicles
일반주제명  
Squamous cell carcinoma
일반주제명  
Tumor necrosis factor-TNF
일반주제명  
Epigenetics
일반주제명  
Keratin
일반주제명  
Genomics
일반주제명  
Phosphorylation
일반주제명  
Tumors
일반주제명  
Morphology
일반주제명  
Transcription factors
기타저자  
Stanford University.
기본자료저록  
Dissertations Abstracts International. 87-01B.
전자적 위치 및 접속  
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MARC

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■035    ▼a(MiAaPQ)Stanfordmk213qn3144
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a570
■1001  ▼aLi,  Nancy  Yanzhe.
■24510▼aDistinct  Tumor  Cell  State  Transitions  Driven  by  Epigenetic  Factors  Contribute  to  Basal  Cell  Carcinoma  Therapy  Resistance
■260    ▼a[Sl]▼bStanford  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a142  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-01,  Section:  B.
■500    ▼aAdvisor:  Oro,  Anthony.
■5021  ▼aThesis  (Ph.D.)--Stanford  University,  2025.
■520    ▼aOvercoming  tumor  evolution  and  therapy  resistance  remains  the  main  challenge  to  creating  successful  anti-tumor  therapies.  Basal  cell  carcinoma  (BCC)  is  not  only  the  most  common  type  of  skin  cancer  but  also  the  most  common  cancer,  making  it  an  ideal  model  for  investigating  tumor  evolution  and  tumor  cell  state  transition  due  to  the  availability  of  patient  samples  and  the  feasibility  to  track  disease  progression  over  time.The  skin  is  composed  of  multiple  epithelial  components  such  as  the  interfollicular  epidermis  (IFE)  and  hair  follicle  (HF),  which  drive  normal  tissue  homeostasis  and  regenerative  processes.  Although  the  processes  that  govern  normal  epithelial  stem  cell  function  are  tightly  governed,  stem  cell  function  can  be  misregulated  and  lead  to  cancer.  BCC  tumor  growth  is  driven  by  sonic  hedgehog  (SHH)  signaling,  a  critical  developmental  and  regenerative  signaling  pathway.  SHH  signaling  is  driven  by  the  binding  of  hedgehog  (HH)  ligands  to  the  PTCHD1  receptor,  leading  to  loss  of  the  repression  on  smoothened  (SMO),  driving  the  translocation  of  the  transcription  factor  GLI1  into  the  nucleus,  which  subsequently  drives  the  growth  and  proliferative  processes  associated  with  tumorigenesis.  SMO  inhibitors  (SMOi)  like  Vismodegib  have  been  used  to  treat  patients  with  locally  advanced  disease,  however,  in  many  cases,  SMOihave  either  been  (1)  ineffective  or  (2)  provide  temporary  inhibition  of  tumor  growth  before  developing  resistance.Various  mechanisms  underlie  BCC  therapy  resistance.  Genetic  mutations  of  SMO  account  for  around  50%  of  resistance  cases  where  gain-of-function  mutations  render  Hh  signaling  constitutively  active  despite  the  presence  of  SMOi.  Epigenetic  factors  account  for  the  other  50%  of  resistance  cases  where  cell-autonomous  or  environmental  changes  contribute  to  pathway  switching  that  renders  BCCs  independent  of  Hh  signaling  for  survival  along  with  the  activation  of  alternative  pathways.Here,  we  focused  on  identifying  and  deeply  elucidating  novel  epigenetic  mechanisms  that  BCCs  undertake  to  achieve  therapy  resistance.  We  identified  two  distinct  developmental  trajectories  that  BCCs  could  undertake  prior  to  SMOitherapy  that  confer  a  selective  advantage  during  therapy.  Chapter  1  will  focus  on  basal-to-squamous  cell  carcinoma  transition  (BST)  as  a  carcinoma  tumor-intrinsic  resistance  pathway  driven  by  activation  of  AP-1  family  of  transcription  factors.  Chapter  2  will  focus  on  basal-to-inflammatory  transition  (BIT)  as  an  environmentally-induced  resistance  pathway  driven  by  NF-kB  signaling  in  tumor  epithelia  that  are  associated  with  a  specialized  inflammatory  environment  defined  by  a  TREM1  myeloid  signature.  While  both  resistance  pathways  are  characterized  by  reversible  tumor  cell  state  changes,  the  induced  tumor  cell  states  display  distinct  markers  for  identification,  are  localized  in  distinct  spatial  neighborhoods  within  the  tumor,  and  are  driven  by  distinct  epigenetic  pathways.  Our  work  provides  critical  insights  into  both  BST  and  BIT  resistant  states  as  novel  targetable  tumor  states  that  provide  unique  therapeutic  opportunities  to  overcome  tumor  resistance.
■590    ▼aSchool  code:  0212.
■650  4▼aGrowth  factors
■650  4▼aCells
■650  4▼aGene  expression
■650  4▼aCancer  therapies
■650  4▼aCloning
■650  4▼aFollicles
■650  4▼aSquamous  cell  carcinoma
■650  4▼aTumor  necrosis  factor-TNF
■650  4▼aEpigenetics
■650  4▼aKeratin
■650  4▼aGenomics
■650  4▼aPhosphorylation
■650  4▼aTumors
■650  4▼aMorphology
■650  4▼aTranscription  factors
■690    ▼a0287
■71020▼aStanford  University.
■7730  ▼tDissertations  Abstracts  International▼g87-01B.
■790    ▼a0212
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358699▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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