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RISS 인기검색어
- 검색키워드
- 저자 : Ostler, Elizabeth Ann (검색결과 4 건)
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DNMT3b7 suppresses growth, induces differentiation and alters DNA methylation in human neuroblastoma
Ostler, Kelly Rae The University of Chicago 2012 해외박사(DDOD)
In adult cancers, epigenetic changes and aberrant splicing of DNMT3B are commonly observed, and gene methylation and expression can be modified by DNMT3B7, a truncated isoform of DNMT3B. Much less is known about the mechanism of epigenetic changes in the pediatric cancer neuroblastoma. To investigate if aberrant DNMT3B transcripts alter DNA methylation, gene expression, and tumor phenotype in neuroblastoma, I measured DNMT3B isoform expression in primary tumors and cell lines. Higher levels of DNMT3B7 were detected in differentiated ganglioneuroblastomas compared to undifferentiated neuroblastomas, suggesting that expression of DNMT3B7 may induce a less clinically aggressive tumor phenotype. To test this hypothesis, I investigated the effects of forced DNMT3B7 in neuroblastoma cells in collaboration with the Cohn Laboratory. I found that DNMT3B7 expression significantly inhibited neuroblastoma cell proliferation in vitro, and in neuroblastoma xenografts, DNMT3B7 decreased angiogenesis and tumor growth. DNMT3B7 -positive cells had higher levels of DNA methylation, and RNA-sequencing revealed a dramatic decrease in expression of FOS and JUN family members. Consistent with the established antagonistic relationship between AP1 expression and retinoic acid receptor activity, increased differentiation was seen in the DNMT3B7-expressing neuroblastoma cells following treatment with all-trans retinoic acid (ATRA) compared to controls. Our results demonstrate that high levels of DNMT3B7 modify the epigenome in neuroblastoma cells, induce changes in gene expression, inhibit tumor growth, and increase sensitivity to ATRA. Further knowledge regarding mechanisms by which DNMT3B7 regulates gene methylation may lead to the development of therapeutic strategies that reverse the epigenetic aberrations that drive neuroblastoma growth.
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Navigating Ideals: Latter-Day Saint Women and Latter-Day Saint Cultural Master Narratives
Ostler, Elizabeth Ann Fordham University ProQuest Dissertations & Theses 2023 해외박사(DDOD)
Cultural master narratives are a primary way that cultures proscribe how and who cultural members are supposed to be. This study coupled cultural consensus analysis and cultural consonance analysis with the master narrative framework to identify Latter-day Saint (LDS) cultural master narratives that emerge from the perspectives and lived experiences of Latter-day Saint women. Building upon the findings from a previous study that identified descriptions of an ideal LDS woman, a pile sorting analysis was conducted with LDS women (N = 30) living in the United States. The findings from pile sorting analysis were used to create a cultural master narrative survey. The responses from survey by LDS women in the United States (N = 2,436) were analyzed using cultural consensus analysis and cultural consonance analysis. This study successfully identified nine Latter-day Saint cultural master narratives. The research design demonstrated that cultural consensus analysis and cultural consonance analysis combined with the master narrative framework effectively identify cultural master narratives. The consensus analysis successfully attended to the master narrative principles of ubiquity, invisibility, utility, and rigidity. The remaining principle, compulsory, as well as utility, were addressed through cultural consonance analysis. .
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