ingest
cdrApp
2018-08-23T18:42:53.029Z
d39a25df-af15-48e9-aec2-c9af81a997a2
modifyDatastreamByValue
RELS-EXT
fedoraAdmin
2018-08-23T18:43:43.668Z
Setting exclusive relation
addDatastream
MD_TECHNICAL
fedoraAdmin
2018-08-23T18:43:54.952Z
Adding technical metadata derived by FITS
addDatastream
MD_FULL_TEXT
fedoraAdmin
2018-08-23T18:44:17.683Z
Adding full text metadata extracted by Apache Tika
modifyDatastreamByValue
RELS-EXT
fedoraAdmin
2018-08-23T18:44:29.108Z
Setting exclusive relation
modifyDatastreamByValue
MD_DESCRIPTIVE
cdrApp
2018-09-27T02:10:04.074Z
modifyDatastreamByValue
MD_DESCRIPTIVE
cdrApp
2019-03-20T20:57:52.241Z
Ashley
Fuller
Author
Department of Pathology and Laboratory Medicine
School of Medicine
Triple-negative breast cancer microenvironments: Molecular and histologic portraits
Triple-negative breast cancer (TNBC), comprised predominantly of the basal-like (BBC) and claudin-low (CLBC) intrinsic subtypes, is a proliferative, invasive disease that accounts for 15-20% of breast cancer cases. Unlike with other breast cancer subtypes, TNBC treatment modalities are generally limited to surgery, radiation, and cytotoxic chemotherapy. Therefore, identification of molecular contributors to TNBC initiation and progression, including signals with relevance to the tumor microenvironment, is important for development of biologically targeted therapies.
It is well accepted that the tumor microenvironment, the non-cancerous cells and tissues in proximity to the frank cancer cells, plays a critical role in breast cancer initiation and progression. However, little is known about the evolution of stromal-epithelial communication during breast tumorigenesis, or how specific signaling mediators alter subtype-specific tumor behavior. To this end, this work leveraged a suite of model systems to better understand how specific components of TNBC microenvironments influence tumor phenotypes and stromal-epithelial interactions. Following a literature review in Chapter 1, Chapter 2 describes research that used three-dimensional culture models of a pre-invasive BBC cell line panel, together with novel imaging technology, to evaluate cancer cell-fibroblast interactions during early stages of tumor initiation. Relative to wild-type cells, pre-invasive BBC cells lacking the TP53 tumor suppressor gene exhibited accelerated and unique responses to fibroblast co-culture. In Chapter 3, the role of the immune microenvironment in TNBC progression was evaluated using a novel animal model. Myeloid-specific Glut1 knockout mice were used to demonstrate that alterations in myeloid cell metabolism reduced the inflammatory potential of mammary tissue macrophages (MTMs) and impeded CLBC progression. Chapter 4 leveraged observational studies of human tissue to develop a digital algorithm to identify histologically stained endothelial cells in cancer-adjacent breast. This algorithm will be used in future studies to quantitatively characterize the vascular microenvironment both across breast cancer subtypes, and for TNBCs in particular. Finally, Chapter 5 integrates insights from all three investigations to identify future directions for studies of TNBC microenvironments. This work reveals previously uncharacterized relationships between TNBCs and their associated stromal cells, some of which may represent plausible therapeutic targets for this tumor subtype.
Summer 2018
2018
Oncology
Basal-like breast cancer, Claudin-low breast cancer, Co-culture, Normal breast, Slc2a1, Tumor microenvironment
eng
Doctor of Philosophy
Dissertation
University of North Carolina at Chapel Hill Graduate School
Degree granting institution
Pathology
Melissa
Troester
Thesis advisor
William
Coleman
Thesis advisor
Stephen
Hursting
Thesis advisor
Liza
Makowski
Thesis advisor
Cyrus
Vaziri
Thesis advisor
text
Ashley
Fuller
Creator
Department of Pathology and Laboratory Medicine
School of Medicine
Triple-negative breast cancer microenvironments: Molecular and histologic portraits
Triple-negative breast cancer (TNBC), comprised predominantly of the basal-like (BBC) and claudin-low (CLBC) intrinsic subtypes, is a proliferative, invasive disease that accounts for 15-20% of breast cancer cases. Unlike with other breast cancer subtypes, TNBC treatment modalities are generally limited to surgery, radiation, and cytotoxic chemotherapy. Therefore, identification of molecular contributors to TNBC initiation and progression, including signals with relevance to the tumor microenvironment, is important for development of biologically targeted therapies.
It is well accepted that the tumor microenvironment, the non-cancerous cells and tissues in proximity to the frank cancer cells, plays a critical role in breast cancer initiation and progression. However, little is known about the evolution of stromal-epithelial communication during breast tumorigenesis, or how specific signaling mediators alter subtype-specific tumor behavior. To this end, this work leveraged a suite of model systems to better understand how specific components of TNBC microenvironments influence tumor phenotypes and stromal-epithelial interactions. Following a literature review in Chapter 1, Chapter 2 describes research that used three-dimensional culture models of a pre-invasive BBC cell line panel, together with novel imaging technology, to evaluate cancer cell-fibroblast interactions during early stages of tumor initiation. Relative to wild-type cells, pre-invasive BBC cells lacking the TP53 tumor suppressor gene exhibited accelerated and unique responses to fibroblast co-culture. In Chapter 3, the role of the immune microenvironment in TNBC progression was evaluated using a novel animal model. Myeloid-specific Glut1 knockout mice were used to demonstrate that alterations in myeloid cell metabolism reduced the inflammatory potential of mammary tissue macrophages (MTMs) and impeded CLBC progression. Chapter 4 leveraged observational studies of human tissue to develop a digital algorithm to identify histologically stained endothelial cells in cancer-adjacent breast. This algorithm will be used in future studies to quantitatively characterize the vascular microenvironment both across breast cancer subtypes, and for TNBCs in particular. Finally, Chapter 5 integrates insights from all three investigations to identify future directions for studies of TNBC microenvironments. This work reveals previously uncharacterized relationships between TNBCs and their associated stromal cells, some of which may represent plausible therapeutic targets for this tumor subtype.
Oncology
Basal-like breast cancer; Claudin-low breast cancer; Co-culture; Normal breast; Slc2a1; Tumor microenvironment
Doctor of Philosophy
Dissertation
University of North Carolina at Chapel Hill Graduate School
Degree granting institution
Pathology
Melissa
Troester
Thesis advisor
William
Coleman
Thesis advisor
Stephen
Hursting
Thesis advisor
Liza
Makowski
Thesis advisor
Cyrus
Vaziri
Thesis advisor
2018
2018-08
eng
text
Ashley
Fuller
Creator
Department of Pathology and Laboratory Medicine
School of Medicine
Triple-negative breast cancer microenvironments: Molecular and histologic portraits
Triple-negative breast cancer (TNBC), comprised predominantly of the basal-like (BBC) and claudin-low (CLBC) intrinsic subtypes, is a proliferative, invasive disease that accounts for 15-20% of breast cancer cases. Unlike with other breast cancer subtypes, TNBC treatment modalities are generally limited to surgery, radiation, and cytotoxic chemotherapy. Therefore, identification of molecular contributors to TNBC initiation and progression, including signals with relevance to the tumor microenvironment, is important for development of biologically targeted therapies.
It is well accepted that the tumor microenvironment, the non-cancerous cells and tissues in proximity to the frank cancer cells, plays a critical role in breast cancer initiation and progression. However, little is known about the evolution of stromal-epithelial communication during breast tumorigenesis, or how specific signaling mediators alter subtype-specific tumor behavior. To this end, this work leveraged a suite of model systems to better understand how specific components of TNBC microenvironments influence tumor phenotypes and stromal-epithelial interactions. Following a literature review in Chapter 1, Chapter 2 describes research that used three-dimensional culture models of a pre-invasive BBC cell line panel, together with novel imaging technology, to evaluate cancer cell-fibroblast interactions during early stages of tumor initiation. Relative to wild-type cells, pre-invasive BBC cells lacking the TP53 tumor suppressor gene exhibited accelerated and unique responses to fibroblast co-culture. In Chapter 3, the role of the immune microenvironment in TNBC progression was evaluated using a novel animal model. Myeloid-specific Glut1 knockout mice were used to demonstrate that alterations in myeloid cell metabolism reduced the inflammatory potential of mammary tissue macrophages (MTMs) and impeded CLBC progression. Chapter 4 leveraged observational studies of human tissue to develop a digital algorithm to identify histologically stained endothelial cells in cancer-adjacent breast. This algorithm will be used in future studies to quantitatively characterize the vascular microenvironment both across breast cancer subtypes, and for TNBCs in particular. Finally, Chapter 5 integrates insights from all three investigations to identify future directions for studies of TNBC microenvironments. This work reveals previously uncharacterized relationships between TNBCs and their associated stromal cells, some of which may represent plausible therapeutic targets for this tumor subtype.
Oncology
Basal-like breast cancer; Claudin-low breast cancer; Co-culture; Normal breast; Slc2a1; Tumor microenvironment
Doctor of Philosophy
Dissertation
University of North Carolina at Chapel Hill Graduate School
Degree granting institution
Melissa
Troester
Thesis advisor
William
Coleman
Thesis advisor
Stephen
Hursting
Thesis advisor
Liza
Makowski
Thesis advisor
Cyrus
Vaziri
Thesis advisor
2018
2018-08
eng
text
Fuller_unc_0153D_18001.pdf
uuid:71d948ef-c198-4502-9d7b-92c1c5cdc010
2020-08-23T00:00:00
2018-07-16T22:00:48Z
proquest
application/pdf
3667476