Silencing of Foxp3 delays the growth of murine melanomas and modifies the tumor immunosuppressive environment

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Abstract
Silencing of Foxp3 delays the growth of murine melanomas and modifies the tumor immunosuppressive environment Moisés A Franco-Molina,* Diana F Miranda-Hernández,* Edgar Mendoza-Gamboa, Pablo Zapata-Benavides, Erika E Coronado-Cerda, Crystel A Sierra-Rivera, Santiago Saavedra-Alonso, Reyes S Taméz-Guerra, Cristina Rodríguez-Padilla Immunology and Virology Department, Biological Sciences Faculty, University Autonoma of Nuevo León (UANL), San Nicolás de los Garza, Nuevo León, Mexico*These authors contributed equally to this work Forkhead box p3 (Foxp3) expression was believed to be specific for T-regulatory cells but has recently been described in non-hematopoietic cells from different tissue origins and in tumor cells from both epithelial and non-epithelial tissues. The aim of this study was to elucidate the role of Foxp3 in murine melanoma. The B16F10 cell line Foxp3 silenced with small interference Foxp3 plasmid transfection was established and named B16F10.1. These cells had lower levels of Foxp3 mRNA (quantitative real-time reverse transcription-polymerase chain reaction [0.235-fold]), protein (flow cytometry [0.02%]), CD25+ expression (0.06%), cellular proliferation (trypan blue staining), and interleukin (IL)-2 production (enzyme-linked immunosorbent assay [72.35 pg/mL]) than those in B16F10 wild-type (WT) cells (P

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