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Impact of Class I Antigen Presentation Alterations in Melanoma- [electronic resource]
Impact of Class I Antigen Presentation Alterations in Melanoma - [electronic resource]
Impact of Class I Antigen Presentation Alterations in Melanoma- [electronic resource]

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자료유형  
 학위논문파일 국외
최종처리일시  
20240214101915
ISBN  
9798380603935
DDC  
616.079
저자명  
Galvez, Mildred.
서명/저자  
Impact of Class I Antigen Presentation Alterations in Melanoma - [electronic resource]
발행사항  
[S.l.]: : University of California, Los Angeles., 2023
발행사항  
Ann Arbor : : ProQuest Dissertations & Theses,, 2023
형태사항  
1 online resource(141 p.)
주기사항  
Source: Dissertations Abstracts International, Volume: 85-04, Section: B.
주기사항  
Includes supplementary digital materials.
주기사항  
Advisor: Ribas, Antoni.
학위논문주기  
Thesis (Ph.D.)--University of California, Los Angeles, 2023.
사용제한주기  
This item must not be sold to any third party vendors.
초록/해제  
요약Immune checkpoint blockade (ICB) targeting programmed cell death-1 (PD-1) has led to prolonged clinical responses among several patients with melanoma and other cancer types. ICB response relies on effective immune recognition and elimination of tumor cells. This depends on the successful presentation of tumor-specific antigens on surface major histocompatibility complex (MHC) class I molecules by tumor cells to the T-cell receptor of cytotoxic CD8+ T cells. Currently, both primary and acquired mechanisms of resistance remain significant barriers to expanding the therapeutic benefits of anti-PD-1 treatment. Several studies have stressed the critical role of antigen processing machinery (APM) defects in mediating resistance to ICB therapies. More specifically, aberrations of the β-2-microglobulin (B2M) gene, which encodes a critical component of the MHC class I molecule, were found to be enriched in patients with melanoma who progressed during therapy. Nevertheless, there are cases of patients with B2M-deficient tumors that respond to ICB, but the exact mechanism mediating this response is currently unknown. Presently, the exact effect of MHC class I APM alterations on anti-PD-1 therapy response requires further characterization and the cells mediating the anti-tumorigenic effects of PD-1 blockade in B2M-defective tumors have not been fully elucidated. In this work, we aim to holistically characterize alterations in components involved in class I antigen processing, presentation, and regulation in melanoma tumors, as well as to elucidate the main cell mediators of class I-deficient tumor removal in patient-derived biopsies and mouse models. Using a clinical dataset of patients with melanoma treated with ICB, whole-exome sequencing and bulk RNA-sequencing data from baseline tumor samples were analyzed to identify somatic class I APM alterations and evaluate correlative clinical outcomes, infiltrating immune cells, and gene expression patterns. Additionally, human melanoma cell lines and B2M-null mouse tumor models were utilized to validate these findings and further explore the impact of B2M and MHC class I defects on tumor intrinsic and extrinsic factors. Collectively, our findings may help offer alternative therapeutic targets and avenues for the treatment of tumors with class I-mediated ICB resistance.
일반주제명  
Immunology.
일반주제명  
Oncology.
일반주제명  
Bioinformatics.
일반주제명  
Pharmacology.
키워드  
Melanoma
키워드  
Immune checkpoint blockade
키워드  
Cancer types
키워드  
Anti-tumorigenic effects
키워드  
Gene expression patterns
기타저자  
University of California, Los Angeles Molecular and Medical Pharmacology 0639
기본자료저록  
Dissertations Abstracts International. 85-04B.
기본자료저록  
Dissertation Abstract International
전자적 위치 및 접속  
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MARC

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■035    ▼a(MiAaPQ)AAI30687927
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a616.079
■1001  ▼aGalvez,  Mildred.
■24510▼aImpact  of  Class  I  Antigen  Presentation  Alterations  in  Melanoma▼h[electronic  resource]
■260    ▼a[S.l.]:▼bUniversity  of  California,  Los  Angeles.  ▼c2023
■260  1▼aAnn  Arbor  :▼bProQuest  Dissertations  &  Theses,  ▼c2023
■300    ▼a1  online  resource(141  p.)
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-04,  Section:  B.
■500    ▼aIncludes  supplementary  digital  materials.
■500    ▼aAdvisor:  Ribas,  Antoni.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  Los  Angeles,  2023.
■506    ▼aThis  item  must  not  be  sold  to  any  third  party  vendors.
■520    ▼aImmune  checkpoint  blockade  (ICB)  targeting  programmed  cell  death-1  (PD-1)  has  led  to  prolonged  clinical  responses  among  several  patients  with  melanoma  and  other  cancer  types.  ICB  response  relies  on  effective  immune  recognition  and  elimination  of  tumor  cells.  This  depends  on  the  successful  presentation  of  tumor-specific  antigens  on  surface  major  histocompatibility  complex  (MHC)  class  I  molecules  by  tumor  cells  to  the  T-cell  receptor  of  cytotoxic  CD8+  T  cells.  Currently,  both  primary  and  acquired  mechanisms  of  resistance  remain  significant  barriers  to  expanding  the  therapeutic  benefits  of  anti-PD-1  treatment.  Several  studies  have  stressed  the  critical  role  of  antigen  processing  machinery  (APM)  defects  in  mediating  resistance  to  ICB  therapies.  More  specifically,  aberrations  of  the  β-2-microglobulin  (B2M)  gene,  which  encodes  a  critical  component  of  the  MHC  class  I  molecule,  were  found  to  be  enriched  in  patients  with  melanoma  who  progressed  during  therapy.  Nevertheless,  there  are  cases  of  patients  with  B2M-deficient  tumors  that  respond  to  ICB,  but  the  exact  mechanism  mediating  this  response  is  currently  unknown.  Presently,  the  exact  effect  of  MHC  class  I  APM  alterations  on  anti-PD-1  therapy  response  requires  further  characterization  and  the  cells  mediating  the  anti-tumorigenic  effects  of  PD-1  blockade  in  B2M-defective  tumors  have  not  been  fully  elucidated.  In  this  work,  we  aim  to  holistically  characterize  alterations  in  components  involved  in  class  I  antigen  processing,  presentation,  and  regulation  in  melanoma  tumors,  as  well  as  to  elucidate  the  main  cell  mediators  of  class  I-deficient  tumor  removal  in  patient-derived  biopsies  and  mouse  models.  Using  a  clinical  dataset  of  patients  with  melanoma  treated  with  ICB,  whole-exome  sequencing  and  bulk  RNA-sequencing  data  from  baseline  tumor  samples  were  analyzed  to  identify  somatic  class  I  APM  alterations  and  evaluate  correlative  clinical  outcomes,  infiltrating  immune  cells,  and  gene  expression  patterns.  Additionally,  human  melanoma  cell  lines  and  B2M-null  mouse  tumor  models  were  utilized  to  validate  these  findings  and  further  explore  the  impact  of  B2M  and  MHC  class  I  defects  on  tumor  intrinsic  and  extrinsic  factors.  Collectively,  our  findings  may  help  offer  alternative  therapeutic  targets  and  avenues  for  the  treatment  of  tumors  with  class  I-mediated  ICB  resistance.
■590    ▼aSchool  code:  0031.
■650  4▼aImmunology.
■650  4▼aOncology.
■650  4▼aBioinformatics.
■650  4▼aPharmacology.
■653    ▼aMelanoma
■653    ▼aImmune  checkpoint  blockade
■653    ▼aCancer  types
■653    ▼aAnti-tumorigenic  effects
■653    ▼aGene  expression  patterns
■690    ▼a0982
■690    ▼a0992
■690    ▼a0715
■690    ▼a0419
■71020▼aUniversity  of  California,  Los  Angeles▼bMolecular  and  Medical  Pharmacology  0639.
■7730  ▼tDissertations  Abstracts  International▼g85-04B.
■773    ▼tDissertation  Abstract  International
■790    ▼a0031
■791    ▼aPh.D.
■792    ▼a2023
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16935293▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.
■980    ▼a202402▼f2024

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