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The Role of Hedgehog Signaling in Lipid Metabolism and Cancer
The Role of Hedgehog Signaling in Lipid Metabolism and Cancer
The Role of Hedgehog Signaling in Lipid Metabolism and Cancer

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자료유형  
 학위논문 서양
최종처리일시  
20250211151007
ISBN  
9798381972054
DDC  
574
저자명  
Daggubati, Vikas.
서명/저자  
The Role of Hedgehog Signaling in Lipid Metabolism and Cancer
발행사항  
[Sl] : University of California, San Francisco, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
160 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-09, Section: B.
주기사항  
Advisor: Reiter, Jeremy.
학위논문주기  
Thesis (Ph.D.)--University of California, San Francisco, 2024.
초록/해제  
요약The Hedgehog (Hh) family of lipid-modified signaling proteins directs embryonic development and tissue homeostasis, and dysregulated Hh signaling drives familial and sporadic cancers. Hh ligands bind to and inhibit the tumor suppressor Patched (PTCH) and allow the oncoprotein Smoothened (SMO) to accumulate in cilia, which in turn activates the GLI family of transcription factors. Recent work has demonstrated that oxysterol lipids bind and modulate SMO activity. This thesis explores the central theme that lipids regulate the Hh pathway which in turn regulates lipid metabolism. First, I review the myriad of sterols that activate or inhibit the Hedgehog pathway. I discuss the possibility utility of Smo ligands or inhibitors in sterol metabolism as cancer therapeutics. Next, I define the Hh gene expression program using RNA sequencing of cultured cells treated with ciliary ligands, human BCCs, and Hh-associated medulloblastomas from humans and mice. These results reveal Hh target genes such as the oxysterol synthase Hsd11β1 and the adipokine Retnla regulate lipid metabolism to drive cell fate decisions in response to Hh pathway activation. Lastly, I demonstrate that Hedgehog signaling can be co-opted to drive resistance to pharmacological blockade of CDK6, an important single-agent molecular therapy in cancer therapeutics. Through CRISPR screens and RNA-sequencing of a mouse model of HH-associated medulloblastoma with genetic deletion of Cdk6, I demonstrate that decreased ribosomal protein expression underlies resistance to CDK6 inhibition in HH-associated medulloblastoma, leading to endoplasmic reticular (ER) stress and activation of the unfolded protein response (UPR). I then demonstrate concurrent genetic deletion or pharmacological inhibition of CDK6 and HSD11s2, an enzyme producing Smoothened-activating lipids, additively blocked cancer growth in multiple mouse genetic models of HH-associated medulloblastoma. In sum, this research program demonstrates that lipid signaling is an avenue to target Hh-dependent cancers and I demonstrate a proof-of-principle therapeutic to target lipid signaling in Hh signaling.
일반주제명  
Biology
일반주제명  
Pharmacology
일반주제명  
Cellular biology
일반주제명  
Genetics
키워드  
Basal cell carcinoma
키워드  
Cilia
키워드  
Hedgehog
키워드  
Lipids
키워드  
Medulloblastoma
기타저자  
University of California, San Francisco Biomedical Sciences
기본자료저록  
Dissertations Abstracts International. 85-09B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

 008250123s2024        us                              c    eng  d
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■00520250211151007
■006m          o    d                
■007cr#unu||||||||
■020    ▼a9798381972054
■035    ▼a(MiAaPQ)AAI30995028
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a574
■1001  ▼aDaggubati,  Vikas.▼0(orcid)0000-0002-9779-4614
■24510▼aThe  Role  of  Hedgehog  Signaling  in  Lipid  Metabolism  and  Cancer
■260    ▼a[Sl]▼bUniversity  of  California,  San  Francisco▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a160  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-09,  Section:  B.
■500    ▼aAdvisor:  Reiter,  Jeremy.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  San  Francisco,  2024.
■520    ▼aThe  Hedgehog  (Hh)  family  of  lipid-modified  signaling  proteins  directs  embryonic  development  and  tissue  homeostasis,  and  dysregulated  Hh  signaling  drives  familial  and  sporadic  cancers.  Hh  ligands  bind  to  and  inhibit  the  tumor  suppressor  Patched  (PTCH)  and  allow  the  oncoprotein  Smoothened  (SMO)  to  accumulate  in  cilia,  which  in  turn  activates  the  GLI  family  of  transcription  factors.  Recent  work  has  demonstrated  that  oxysterol  lipids  bind  and  modulate  SMO  activity.  This  thesis  explores  the  central  theme  that  lipids  regulate  the  Hh  pathway  which  in  turn  regulates  lipid  metabolism.  First,  I  review  the  myriad  of  sterols  that  activate  or  inhibit  the  Hedgehog  pathway.  I  discuss  the  possibility  utility  of  Smo  ligands  or  inhibitors  in  sterol  metabolism  as  cancer  therapeutics.  Next,  I  define  the  Hh  gene  expression  program  using  RNA  sequencing  of  cultured  cells  treated  with  ciliary  ligands,  human  BCCs,  and  Hh-associated  medulloblastomas  from  humans  and  mice.  These  results  reveal  Hh  target  genes  such  as  the  oxysterol  synthase  Hsd11β1  and  the  adipokine  Retnla  regulate  lipid  metabolism  to  drive  cell  fate  decisions  in  response  to  Hh  pathway  activation.  Lastly,  I  demonstrate  that  Hedgehog  signaling  can  be  co-opted  to  drive  resistance  to  pharmacological  blockade  of  CDK6,  an  important  single-agent  molecular  therapy  in  cancer  therapeutics.  Through  CRISPR  screens  and  RNA-sequencing  of  a  mouse  model  of  HH-associated  medulloblastoma  with  genetic  deletion  of  Cdk6,  I  demonstrate  that  decreased  ribosomal  protein  expression  underlies  resistance  to  CDK6  inhibition  in  HH-associated  medulloblastoma,  leading  to  endoplasmic  reticular  (ER)  stress  and  activation  of  the  unfolded  protein  response  (UPR).  I  then  demonstrate  concurrent  genetic  deletion  or  pharmacological  inhibition  of  CDK6  and  HSD11s2,  an  enzyme  producing  Smoothened-activating  lipids,  additively  blocked  cancer  growth  in  multiple  mouse  genetic  models  of  HH-associated  medulloblastoma.  In  sum,  this  research  program  demonstrates  that  lipid  signaling  is  an  avenue  to  target  Hh-dependent  cancers  and  I  demonstrate  a  proof-of-principle  therapeutic  to  target  lipid  signaling  in  Hh  signaling.
■590    ▼aSchool  code:  0034.
■650  4▼aBiology
■650  4▼aPharmacology
■650  4▼aCellular  biology
■650  4▼aGenetics
■653    ▼aBasal  cell  carcinoma
■653    ▼aCilia
■653    ▼aHedgehog
■653    ▼aLipids
■653    ▼aMedulloblastoma
■690    ▼a0306
■690    ▼a0419
■690    ▼a0379
■690    ▼a0369
■71020▼aUniversity  of  California,  San  Francisco▼bBiomedical  Sciences.
■7730  ▼tDissertations  Abstracts  International▼g85-09B.
■790    ▼a0034
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17160378▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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