Cellular and Genetic Dynamics of the Melanoma Microenvironment- [electronic resource]
Cellular and Genetic Dynamics of the Melanoma Microenvironment- [electronic resource]
- 자료유형
- 학위논문파일 국외
- 최종처리일시
- 20240214100115
- ISBN
- 9798379615994
- DDC
- 574
- 저자명
- Stirtz, Georgia.
- 서명/저자
- Cellular and Genetic Dynamics of the Melanoma Microenvironment - [electronic resource]
- 발행사항
- [S.l.]: : Harvard University., 2023
- 발행사항
- Ann Arbor : : ProQuest Dissertations & Theses,, 2023
- 형태사항
- 1 online resource(177 p.)
- 주기사항
- Source: Dissertations Abstracts International, Volume: 84-12, Section: B.
- 주기사항
- Includes supplementary digital materials.
- 주기사항
- Advisor: Zon, Leonard.
- 학위논문주기
- Thesis (Ph.D.)--Harvard University, 2023.
- 사용제한주기
- This item must not be sold to any third party vendors.
- 초록/해제
- 요약The tumor microenvironment is comprised of a diverse assemblage of cells. These populations dynamically interact with one another in varied ways that modify the individual cells and shape the overall trajectory of the tumor. Here, we examine the ways CD8+ T cells, cancer-associated fibroblasts, and endothelial cells engage with tumors and are reshaped using novel imaging and genetic techniques in an autochthonous, zebrafish model of melanoma. Using in vivo live imaging, we visualized the native T cell response throughout tumor development. We identified crater-like structures on the surface of melanoma tumors wherein CD8+ T cells preferentially accumulate and engage with dendritic cells and melanoma cells. Upon immune stimulation with CpG ODN or TGFb-inhibitor, crater-resident CD8+ T cells were found engaging with apoptotic melanoma cells along the crater edge and expressing ifng in tight clusters, respectively. These craters were conserved in human melanoma tumors in perivascular spaces and at the stromal border and similarly harbor accumulations of CD8+ T cells. We then used sequencing-based approaches to assess the transformation of stromal populations in the context of zebrafish melanoma. We identified a cancer-activated fibroblast population that exhibited a distinct transcriptional signature and a unique chromatin landscape. Zebrafish melanoma cancer-activated fibroblasts specifically upregulated a variety of secreted factors, including cxcl8b.1 (IL8). We found that overexpression of cxcl8b.1 in zebrafish melanoma induces a robust change in tumor vascularization indicative of increased angiogenesis and a trend toward CD8- T cell infiltration. Finally, we used genetic lineage tracing to assess clonal dynamics of tumor, endothelial, and stromal cells in zebrafish melanoma. We identified clonal expansion of tumor cells in BRAF- and NRAS-mutant melanoma. While endothelial cells did not exhibit significant changes in clonal dominance or diversity, stromal cells in aged NRAS tumor-bearing fish displayed a trend toward decreasing clone number and dominance of 1-2 clones, suggesting that tumor stroma is selectively shaped by the tumor or surrounding tissue. Together this work identifies novel cellular dynamics between CD8+ T cells, stromal cells, endothelial cells, and tumor cells and highlights ways in which cellular interactions shape the activity of the tumor niche.
- 일반주제명
- Biology.
- 일반주제명
- Immunology.
- 일반주제명
- Cellular biology.
- 키워드
- Clonality
- 키워드
- Melanoma
- 키워드
- Stromal cells
- 키워드
- T cells
- 기타저자
- Harvard University Medical Sciences
- 기본자료저록
- Dissertations Abstracts International. 84-12B.
- 기본자료저록
- Dissertation Abstract International
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.