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- W2334833242 abstract "Purpose: The purpose of the current study is to establish the distribution of tumor associated macrophages (TAMs) during tumor development in a transgenic retinoblastoma mouse model, study the contribution of bone-marrow derived macrophages in these tumors, and assess the supportive role of TAMs in retinoblastoma tumor growth. Methods: Macrophage infiltration in transgenic retinoblastoma tumors was assessed by immunohistochemistry at different time points in tumorigenesis. To establish the origin of TAMs in transgenic retinoblastoma tumors, 107 bone marrow cells from green fluorescent protein (GFP) positive 16-week-old mice were transplanted into age-matched, irradiated LHBETATAG mice via tail vein injections. Macrophage depletion was performed by subconjuctival (SC) delivery of liposomal clodronate. Results: TAMs’ density increased from 4- to 12-weeks of age in mice with small to medium-sized tumors (p=0.037), and remained stable in the later stages of the disease (i.e., 16-week-old with large tumors; p=0.20). 38% of TAMs (2.5 ± 3.2 cells per 400X hpf) in 16-week old mice were GFP-positive, bone marrow-derived macrophages. Total TAM depletion was correlated with a significant decrease in the expression levels of MMP-9 (p=0.014) and mature vessels (p Conclusions: The current study expands our understanding of the complex role that macrophages play in retinoblastoma. Macrophage modulation in the tumor microenvironment is a critical factor in retinoblastoma tumor development. Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 102nd Annual Meeting of the American Association for Cancer Research; 2011 Apr 2-6; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2011;71(8 Suppl):Abstract nr 1517. doi:10.1158/1538-7445.AM2011-1517" @default.
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- W2334833242 date "2011-04-15" @default.
- W2334833242 modified "2023-09-27" @default.
- W2334833242 title "Abstract 1517: Retinoblastoma tumor development: Role of tumor-associated macrophages and their sub-type in LHBETATAGretinal tumor progression" @default.
- W2334833242 doi "https://doi.org/10.1158/1538-7445.am2011-1517" @default.
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