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Characterization of the Mechanisms Driving the Transcription and Tumorigenic Potential of Merkel Cell Polyomavirus
Characterization of the Mechanisms Driving the Transcription and Tumorigenic Potential of Merkel Cell Polyomavirus
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211150939
- ISBN
- 9798382834306
- DDC
- 576.6
- 저자명
- Yang, June F.
- 서명/저자
- Characterization of the Mechanisms Driving the Transcription and Tumorigenic Potential of Merkel Cell Polyomavirus
- 발행사항
- [Sl] : University of Pennsylvania, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 157 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
- 주기사항
- Advisor: You, Jianxin.
- 학위논문주기
- Thesis (Ph.D.)--University of Pennsylvania, 2024.
- 초록/해제
- 요약Merkel cell carcinoma (MCC) is a rare and aggressive form of skin cancer that metastasizes rapidly and resists most current therapies. Approximately 80% of MCC tumors are associated with Merkel cell polyomavirus (MCPyV), which clonally integrates into the host cell genome prior to oncogenic expansion. MCPyV+ MCC oncogenic maintenance relies on the continuous expression of the viral tumor antigens, LTT and sT, such that cancer cell death occurs upon inhibition of tumor antigen expression. Additionally, the ability to express LT/sT in a potential host cell determines the virus' narrow infectious tropism. We therefore sought to understand the molecular mechanisms that control the expression of the viral oncogenes at the transcriptional level during infection and oncogenesis. Through inhibitor screening experiments, we identified the histone acetyltransferases (HATs) p300 and CBP as key regulators of MCPyV transcription. We discovered that p300/CBP mediate viral gene expression through both direct acetylation of viral genome-associated histones and through coactivation of the NCRR-binding transcription factor NF-κB. We also demonstrated that HAT inhibitors (HATis) specific to p300/CBP were highly effective at reducing LTT expression in MCPyV+ MCC cell lines, leading to tumor cell death. We investigated the cell-type specific factors that regulate MCPyV transcription in order to improve our understanding of the cell type(s) that may support MCPyV infection and tumorigenesis. We identified the B cell development factors EBF1 and PAX5 as regulators of MCPyV transcription in only MCPyV+ MCC and not during infection, demonstrating that viral gene expression is regulated differently in the contexts of infection and cancer. Furthermore, we examined the effects of a hypoxic microenvironment on MCPyV gene expression, and found that hypoxic conditions could induce or repress viral transcription depending on whether the host cell is a site of active inflammatory signaling.In our studies, we have identified multiple factors and mechanisms that regulate MCPyV gene expression during infection and oncogenesis. We have also established a novel MCPyV+ MCC treatment strategy of targeting LTT/sT expression through downregulation of their transcription via small molecule inhibition.
- 일반주제명
- Virology
- 일반주제명
- Molecular biology
- 일반주제명
- Microbiology
- 일반주제명
- Cellular biology
- 일반주제명
- Oncology
- 키워드
- Transcription
- 키워드
- Tumor virus
- 기타저자
- University of Pennsylvania Cell and Molecular Biology
- 기본자료저록
- Dissertations Abstracts International. 85-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211150939
■006m o d
■007cr#unu||||||||
■020 ▼a9798382834306
■035 ▼a(MiAaPQ)AAI30991648
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a576.6
■1001 ▼aYang, June F.
■24510▼aCharacterization of the Mechanisms Driving the Transcription and Tumorigenic Potential of Merkel Cell Polyomavirus
■260 ▼a[Sl]▼bUniversity of Pennsylvania▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a157 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-12, Section: B.
■500 ▼aAdvisor: You, Jianxin.
■5021 ▼aThesis (Ph.D.)--University of Pennsylvania, 2024.
■520 ▼aMerkel cell carcinoma (MCC) is a rare and aggressive form of skin cancer that metastasizes rapidly and resists most current therapies. Approximately 80% of MCC tumors are associated with Merkel cell polyomavirus (MCPyV), which clonally integrates into the host cell genome prior to oncogenic expansion. MCPyV+ MCC oncogenic maintenance relies on the continuous expression of the viral tumor antigens, LTT and sT, such that cancer cell death occurs upon inhibition of tumor antigen expression. Additionally, the ability to express LT/sT in a potential host cell determines the virus' narrow infectious tropism. We therefore sought to understand the molecular mechanisms that control the expression of the viral oncogenes at the transcriptional level during infection and oncogenesis. Through inhibitor screening experiments, we identified the histone acetyltransferases (HATs) p300 and CBP as key regulators of MCPyV transcription. We discovered that p300/CBP mediate viral gene expression through both direct acetylation of viral genome-associated histones and through coactivation of the NCRR-binding transcription factor NF-κB. We also demonstrated that HAT inhibitors (HATis) specific to p300/CBP were highly effective at reducing LTT expression in MCPyV+ MCC cell lines, leading to tumor cell death. We investigated the cell-type specific factors that regulate MCPyV transcription in order to improve our understanding of the cell type(s) that may support MCPyV infection and tumorigenesis. We identified the B cell development factors EBF1 and PAX5 as regulators of MCPyV transcription in only MCPyV+ MCC and not during infection, demonstrating that viral gene expression is regulated differently in the contexts of infection and cancer. Furthermore, we examined the effects of a hypoxic microenvironment on MCPyV gene expression, and found that hypoxic conditions could induce or repress viral transcription depending on whether the host cell is a site of active inflammatory signaling.In our studies, we have identified multiple factors and mechanisms that regulate MCPyV gene expression during infection and oncogenesis. We have also established a novel MCPyV+ MCC treatment strategy of targeting LTT/sT expression through downregulation of their transcription via small molecule inhibition.
■590 ▼aSchool code: 0175.
■650 4▼aVirology
■650 4▼aMolecular biology
■650 4▼aMicrobiology
■650 4▼aCellular biology
■650 4▼aOncology
■653 ▼aMerkel cell polyomavirus
■653 ▼aTranscription
■653 ▼aTumor virus
■653 ▼aViral oncoprotein
■653 ▼aViral transcription
■690 ▼a0720
■690 ▼a0307
■690 ▼a0410
■690 ▼a0379
■690 ▼a0992
■71020▼aUniversity of Pennsylvania▼bCell and Molecular Biology.
■7730 ▼tDissertations Abstracts International▼g85-12B.
■790 ▼a0175
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17160234▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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