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FOXO3, Estrogen Receptor Alpha, and Androgen Receptor Impact Tumor Growth Rate and Infiltration of Dendritic Cell Subsets Differentially Between Male and Female Mice

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Date 2017 Feb 24
PMID 28229217
Citations 16
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Abstract

Tumors evade immune recognition and destruction in many ways including the creation of an immune-suppressive tumor microenvironment (TME). Dendritic cells (DC) that infiltrate the TME are tolerogenic, and suppress effector T cells and anti-tumor activity. Previous reports demonstrated that a key regulator of tolerance in DC is the transcription factor FOXO3. Gender disparity has been studied in cancer in relation to incidence, aggressiveness, and prognosis. Few studies have touched on the importance in relation to impact on the immune system. In the current study, we show that there are significant differences in tumor growth between males and females. Additionally, frequencies and the function of FOXO3 expressed by DC subsets that infiltrate tumors vary between genders. Our results show for the first time that DC FOXO3 expression and function is altered in females. In vitro results indicate that these differences may be the result of exposure to estrogen. These differences may be critical considerations for the enhancement of immunotherapy for cancer.

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