4.2 Review

Dual function of MyD88 in inflammation and oncogenesis: implications for therapeutic intervention

Journal

CURRENT OPINION IN ONCOLOGY
Volume 26, Issue 1, Pages 86-91

Publisher

LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/CCO.0000000000000037

Keywords

carcinogenesis; inflammation; MyD88; Ras; toll-like receptors

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Funding

  1. French National Cancer Institute
  2. Ligue Contre le Cancer
  3. Association de Recherche Contre le Cancer

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Purpose of reviewInflammation is emerging as a new hallmark of cancer, and the toll-like receptor and interleukin-1 receptor adaptor molecule MyD88 has been linked to tumorigenesis. The purpose of this review is to give a brief overview of the latest advances in understanding the complexity of MyD88 implication in tumorigenesis.Recent findingsMyD88 is shown to play a protumorigenic role through two mechanisms. First, it activates the nuclear factor kappa-light-chain-enhancer of activated B cells signaling pathway in the hematopoietic compartment and in tumor cells, inducing an inflammatory environment favorable to carcinogenesis. Second, it plays a cell-autonomous role in Ras signaling and transformation, independently of its role in inflammatory signaling. MyD88 mediates the optimal activation of the Ras/extracellular signal-regulated kinase (ERK) pathway by binding to ERK and protecting it from dephosphorylation. This optimal activation of the Ras pathway is essential for the expression of important DNA repair enzymes, allowing cancer cells to efficiently repair damaged DNA. MyD88 is also shown in certain cases to play an antitumoral role through modulation of the immune responseSummaryThese findings present a new dual function model for MyD88 implication in carcinogenesis making it a potential therapeutic target in cancer.

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