Innate immune signaling through differential RIPK1 expression promote tumor progression in head and neck squamous cell carcinoma.

Journal Article (Journal Article)

Head and neck squamous cell carcinoma (HNSCC) is a devastating disease for which new treatments, such as immunotherapy are needed. Synthetic double-stranded RNAs, which activate toll-like receptor 3 (TLR3), have been used as potent adjuvants in cancer immunotherapy by triggering a proapoptotic response in cancer cells. A better understanding of the mechanism of TLR3-mediated apoptosis and its potential involvement in controlling tumor metastasis could lead to improvements in current treatment. Using paired, autologous primary and metastatic HNSCC cells we previously showed that metastatic, but not primary tumor-derived cells, were unable to activate prosurvival NF-κB in response to p(I):p(C) resulting in an enhanced apoptotic response. Here, we show that transcriptional downregulation of receptor-interacting serine/threonine-protein kinase 1 (RIPK1) in metastatic HNSCC cells causes a loss of TLR3-mediated NF-κB signaling, resulting in enhanced apoptosis. Loss of RIPK1 strongly correlates with metastatic disease in a cohort of HNSCC patients. This downregulation of RIPK1 is possibly mediated by enhanced methylation of the RIPK1 promoter in tumor cells and enhances protumorigenic properties such as cell migration. The results described here establish a novel mechanism of TLR3-mediated apoptosis in metastatic cells and may create new opportunities for using double stranded RNA to target metastatic tumor cells.

Full Text

Duke Authors

Cited Authors

  • McCormick, KD; Ghosh, A; Trivedi, S; Wang, L; Coyne, CB; Ferris, RL; Sarkar, SN

Published Date

  • May 2016

Published In

Volume / Issue

  • 37 / 5

Start / End Page

  • 522 - 529

PubMed ID

  • 26992898

Pubmed Central ID

  • PMC6086476

Electronic International Standard Serial Number (EISSN)

  • 1460-2180

Digital Object Identifier (DOI)

  • 10.1093/carcin/bgw032

Language

  • eng

Conference Location

  • England