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posted on 2024-05-06, 10:20 authored by Mara P. Steinkamp, Irina Lagutina, Kathryn J. Brayer, Fred Schultz, Danielle Burke, Vernon S. Pankratz, Sarah F. Adams, Laurie G. Hudson, Scott A. Ness, Angela Wandinger-Ness Detection of TAMs in huNBSGW PDX tumor sections. A, Serial sections of huNBSGW PDX tumor tissue were labeled with human-specific antibodies against a mitochondrial protein to label all human cells and the TAM marker CD68. Scale bar, 100 μm. B, Quantification of the number of TAMs using HALO software to identify CD68+ cells. Values are no. of positive cells/100,000 cells. The box plots indicate the mean, minimum, and maximum. Black dots indicate values for each tumor analyzed (n = 2–3).
Funding
HHS | NIH | National Cancer Institute (NCI)
UNM | School of Medicine, University of New Mexico (UNM SOM)
History
ARTICLE ABSTRACT
The importance of the immune microenvironment in ovarian cancer progression, metastasis, and response to therapies has become increasingly clear, especially with the new emphasis on immunotherapies. To leverage the power of patient-derived xenograft (PDX) models within a humanized immune microenvironment, three ovarian cancer PDXs were grown in humanized NBSGW (huNBSGW) mice engrafted with human CD34+ cord blood–derived hematopoietic stem cells. Analysis of cytokine levels in the ascites fluid and identification of infiltrating immune cells in the tumors demonstrated that these humanized PDX (huPDX) established an immune tumor microenvironment similar to what has been reported for patients with ovarian cancer. The lack of human myeloid cell differentiation has been a major setback for humanized mouse models, but our analysis shows that PDX engraftment increases the human myeloid population in the peripheral blood. Analysis of cytokines within the ascites fluid of huPDX revealed high levels of human M-CSF, a key myeloid differentiation factor as well as other elevated cytokines that have previously been identified in ovarian cancer patient ascites fluid including those involved in immune cell differentiation and recruitment. Human tumor-associated macrophages and tumor-infiltrating lymphocytes were detected within the tumors of humanized mice, demonstrating immune cell recruitment to tumors. Comparison of the three huPDX revealed certain differences in cytokine signatures and in the extent of immune cell recruitment. Our studies show that huNBSGW PDX models reconstitute important aspects of the ovarian cancer immune tumor microenvironment, which may recommend these models for preclinical therapeutic trials.
huPDX models are ideal preclinical models for testing novel therapies. They reflect the genetic heterogeneity of the patient population, enhance human myeloid differentiation, and recruit immune cells to the tumor microenvironment.
