Downregulation of adaptor protein MyD88 compromises the angiogenic potential of B16 murine melanoma

TRUCCO, LUCAS DANIEL; ROSELLI, EMILIANO; ARAYA, PAULA; NUÑEZ, NICOLÁS GONZALO; MENA, HEBE AGUSTINA; BOCCO, JOSÉ LUIS; NEGROTTO, SOLEDAD; MACCIONI, MARIANA

PLOS ONE

PUBLIC LIBRARY SCIENCE

Año: 2017 vol. 12

1932-6203

he mechanisms that link inflammatory responses to cancer development remain a subject of intense investigation, emphasizing the need to better understand the cellular and molecular pathways that create a tumor promoting microenvironment. The myeloid differentiation primary response protein MyD88 acts as a main adaptor molecule for the signaling cascades initiated from Toll-like receptors (TLRs) and the interleukin 1 receptor (IL-1R). MyD88 has been shown to contribute to tumorigenesis in many inflammation-associated cancer models. In this study, we sought to better define the role of MyD88 in neoplastic cells using a murine melanoma model. Herein, we have demonstrated that MyD88 expression is required to maintain the angiogenic switch that supports B16 melanoma growth. By knocking down MyD88 we reduced TLR-mediated NF-κB activation with no evident effects over cell proliferation and survival. In addition, MyD88 downregulation was associated with a decrease of HIF1α levels an