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Rhythms of Risk: The Mechanistic Intersection of Circadian Clocks and Cancer
Rhythms of Risk: The Mechanistic Intersection of Circadian Clocks and Cancer
Rhythms of Risk: The Mechanistic Intersection of Circadian Clocks and Cancer

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자료유형  
 학위논문 서양
최종처리일시  
20260202103141
ISBN  
9798283478432
DDC  
574
저자명  
Mello, Rebecca M.
서명/저자  
Rhythms of Risk: The Mechanistic Intersection of Circadian Clocks and Cancer
발행사항  
[Sl] : The Scripps Research Institute, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
140 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
주기사항  
Advisor: Lamia, Katja A.
학위논문주기  
Thesis (Ph.D.)--The Scripps Research Institute, 2025.
초록/해제  
요약Circadian rhythms-daily cycles that regulate behavior, physiology, and mental state-are influenced by environmental cues such as light cycles and food intake. Misalignment between an organism's internal clock and its environment, as seen in night shift workers, is associated with an increased risk of specific types of cancer. Moreover, many tumors display disrupted co-expression of clock genes relative to healthy tissue of the same origin. This suggests that circadian disruption not only enhances malignancy risk, but it also serves as a hallmark of disease pathology.However, the effect of circadian disruption on cancer growth and the degree to which tumors have disrupted expression of clock genes is not universal and is likely influenced by several factors such as tissue origin and molecular mechanisms driving disease progression. Genetically engineered mouse models (GEMMs) of cancer housed in lighting conditions that mimic the disruption experienced in night shift workers demonstrate enhanced tumor burden in some cases, but this is not observed in all GEMMs, such as in the case of c-MYC driven lymphoma. This suggests that each cancer type should be considered separately when assessing the impact of circadian disruption on tumorigenesis.In addition to manipulating lighting schedules, genetic deletion of the circadian clock transcription factor, brain and muscle ARNT-like protein 1 (BMAL1), in the background of GEMMs of malignancy has been shown to exacerbate or improve the disease outcome depending on the type of cancer being investigated. This paradoxical effect suggests that the relationship between the circadian clock components and cancer is also highly context-dependent and influenced by specific genetic and environmental factors.Clear cell renal cell carcinoma (ccRCC) is characterized by inactivation of the von Hippel Lindau (VHL) ubiquitin ligase, which targets hypoxia inducible factors 1 alpha (HIF1α) and 2 alpha (HIF2α, a.k.a. EPAS1) for degradation. Like BMAL1, HIF1α and HIF2α are basic helix-loop-helix and PER-ARNT-SIM domain (bHLH-PAS) transcription factors that bind DNA with a common heterodimer partner aryl hydrocarbon receptor nuclear translocator (ARNT, a.k.a., HIF1β). Suppression of HIF2α is required for VHL to inhibit ccRCC tumor growth (Courtney et al., 2020; Kondo et al., 2002), highlighting the oncogenic role of HIF2α in ccRCC.Here, we found ccRCC exhibits robust circadian rhythms and clinical samples of ccRCC have higher BMAL1 expression and percentage of BMAL1 positive nuclei relative to normal kidney tissue. BMAL1 cooperates with HIF2α to activate transcription. While BMAL1 depletion reprograms HIF2α chromatin association and HIF2α target gene expression and reduces ccRCC growth in culture and in xenografts. BMAL1 overexpression drives tumorgraft growth via interactions with HIF2α. These findings suggest a critical role for BMAL1 in ccRCC.Considering the critical function of HIF2α driving ccRCC growth, significant efforts have been made to develop small molecules that disrupt HIF2α-ARNT heterodimers. In 2021, the FDA approved belzutifan for treating VHL-mutated ccRCC patients. Despite this milestone, approximately 30% of ccRCC patient-derived xenografts (PDXs) exhibit resistance to HIF2α antagonists like PT2399. RNA-sequencing analysis of these PDXs revealed that BMAL1 mRNA levels were higher in tumors sensitive to HIF2α antagonists, suggesting BMAL1 may influence treatment responsiveness. Supporting this, BMAL1-HIF2α heterodimers are more susceptible to PT2399-mediated suppression than ARNT-HIF2α heterodimers. Additionally, ccRCC tumorgrafts expressing mutant BMAL1, which cannot bind HIF2α, are resistant to PT2399-induced growth suppression. Notably, the efficacy of PT2399 in suppressing tumor growth depends on the time of day it is administered, emphasizing the circadian influence on treatment.These findings suggest that an alternative HIF2α heterodimer-incorporating BMAL1-modulates HIF2α activity, tumor growth, and drug sensitivity in ccRCC. This underscores the need to consider the circadian-hypoxia axis when optimizing belzutifan therapy in clinical settings and presents alternative targets for future therapeutic approaches.
일반주제명  
Molecular biology
일반주제명  
Cellular biology
일반주제명  
Biology
일반주제명  
Oncology
키워드  
Circadian rhythms
키워드  
Hypoxia
키워드  
Lymphoma
키워드  
Renal cell carcinoma
기타저자  
The Scripps Research Institute Molecular Biology
기본자료저록  
Dissertations Abstracts International. 86-12B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aMello,  Rebecca  M.
■24510▼aRhythms  of  Risk:  The  Mechanistic  Intersection  of  Circadian  Clocks  and  Cancer
■260    ▼a[Sl]▼bThe  Scripps  Research  Institute▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a140  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-12,  Section:  B.
■500    ▼aAdvisor:  Lamia,  Katja  A.
■5021  ▼aThesis  (Ph.D.)--The  Scripps  Research  Institute,  2025.
■520    ▼aCircadian  rhythms-daily  cycles  that  regulate  behavior,  physiology,  and  mental  state-are  influenced  by  environmental  cues  such  as  light  cycles  and  food  intake.  Misalignment  between  an  organism's  internal  clock  and  its  environment,  as  seen  in  night  shift  workers,  is  associated  with  an  increased  risk  of  specific  types  of  cancer.  Moreover,  many  tumors  display  disrupted  co-expression  of  clock  genes  relative  to  healthy  tissue  of  the  same  origin.  This  suggests  that  circadian  disruption  not  only  enhances  malignancy  risk,  but  it  also  serves  as  a  hallmark  of  disease  pathology.However,  the  effect  of  circadian  disruption  on  cancer  growth  and  the  degree  to  which  tumors  have  disrupted  expression  of  clock  genes  is  not  universal  and  is  likely  influenced  by  several  factors  such  as  tissue  origin  and  molecular  mechanisms  driving  disease  progression.  Genetically  engineered  mouse  models  (GEMMs)  of  cancer  housed  in  lighting  conditions  that  mimic  the  disruption  experienced  in  night  shift  workers  demonstrate  enhanced  tumor  burden  in  some  cases,  but  this  is  not  observed  in  all  GEMMs,  such  as  in  the  case  of  c-MYC  driven  lymphoma.  This  suggests  that  each  cancer  type  should  be  considered  separately  when  assessing  the  impact  of  circadian  disruption  on  tumorigenesis.In  addition  to  manipulating  lighting  schedules,  genetic  deletion  of  the  circadian  clock  transcription  factor,  brain  and  muscle  ARNT-like  protein  1  (BMAL1),  in  the  background  of  GEMMs  of  malignancy  has  been  shown  to  exacerbate  or  improve  the  disease  outcome  depending  on  the  type  of  cancer  being  investigated.  This  paradoxical  effect  suggests  that  the  relationship  between  the  circadian  clock  components  and  cancer  is  also  highly  context-dependent  and  influenced  by  specific  genetic  and  environmental  factors.Clear  cell  renal  cell  carcinoma  (ccRCC)  is  characterized  by  inactivation  of  the  von  Hippel  Lindau  (VHL)  ubiquitin  ligase,  which  targets  hypoxia  inducible  factors  1  alpha  (HIF1α)  and  2  alpha  (HIF2α,  a.k.a.  EPAS1)  for  degradation.  Like  BMAL1,  HIF1α  and  HIF2α  are  basic  helix-loop-helix  and  PER-ARNT-SIM  domain  (bHLH-PAS)  transcription  factors  that  bind  DNA  with  a  common  heterodimer  partner  aryl  hydrocarbon  receptor  nuclear  translocator  (ARNT,  a.k.a.,  HIF1β).  Suppression  of  HIF2α  is  required  for  VHL  to  inhibit  ccRCC  tumor  growth  (Courtney  et  al.,  2020;  Kondo  et  al.,  2002),  highlighting  the  oncogenic  role  of  HIF2α  in  ccRCC.Here,  we  found  ccRCC  exhibits  robust  circadian  rhythms  and  clinical  samples  of  ccRCC  have  higher  BMAL1  expression  and  percentage  of  BMAL1  positive  nuclei  relative  to  normal  kidney  tissue.  BMAL1  cooperates  with  HIF2α  to  activate  transcription.  While  BMAL1  depletion  reprograms  HIF2α  chromatin  association  and  HIF2α  target  gene  expression  and  reduces  ccRCC  growth  in  culture  and  in  xenografts.  BMAL1  overexpression  drives  tumorgraft  growth  via  interactions  with  HIF2α.  These  findings  suggest  a  critical  role  for  BMAL1  in  ccRCC.Considering  the  critical  function  of  HIF2α  driving  ccRCC  growth,  significant  efforts  have  been  made  to  develop  small  molecules  that  disrupt  HIF2α-ARNT  heterodimers.  In  2021,  the  FDA  approved  belzutifan  for  treating  VHL-mutated  ccRCC  patients.  Despite  this  milestone,  approximately  30%  of  ccRCC  patient-derived  xenografts  (PDXs)  exhibit  resistance  to  HIF2α  antagonists  like  PT2399.  RNA-sequencing  analysis  of  these  PDXs  revealed  that  BMAL1  mRNA  levels  were  higher  in  tumors  sensitive  to  HIF2α  antagonists,  suggesting  BMAL1  may  influence  treatment  responsiveness.  Supporting  this,  BMAL1-HIF2α  heterodimers  are  more  susceptible  to  PT2399-mediated  suppression  than  ARNT-HIF2α  heterodimers.  Additionally,  ccRCC  tumorgrafts  expressing  mutant  BMAL1,  which  cannot  bind  HIF2α,  are  resistant  to  PT2399-induced  growth  suppression.  Notably,  the  efficacy  of  PT2399  in  suppressing  tumor  growth  depends  on  the  time  of  day  it  is  administered,  emphasizing  the  circadian  influence  on  treatment.These  findings  suggest  that  an  alternative  HIF2α  heterodimer-incorporating  BMAL1-modulates  HIF2α  activity,  tumor  growth,  and  drug  sensitivity  in  ccRCC.  This  underscores  the  need  to  consider  the  circadian-hypoxia  axis  when  optimizing  belzutifan  therapy  in  clinical  settings  and  presents  alternative  targets  for  future  therapeutic  approaches.
■590    ▼aSchool  code:  1179.
■650  4▼aMolecular  biology
■650  4▼aCellular  biology
■650  4▼aBiology
■650  4▼aOncology
■653    ▼aCircadian  rhythms
■653    ▼aHypoxia
■653    ▼aLymphoma
■653    ▼aRenal  cell  carcinoma
■690    ▼a0307
■690    ▼a0379
■690    ▼a0992
■690    ▼a0306
■71020▼aThe  Scripps  Research  Institute▼bMolecular  Biology.
■7730  ▼tDissertations  Abstracts  International▼g86-12B.
■790    ▼a1179
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357164▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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