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Toll-like receptors expressed in tumor cells: targets for therapy

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Abstract

Toll-like receptors (TLRs), mainly expressing in human immune related cells and epithelial cells, play an essential role in the host defense against microbes by recognizing conserved bacterial molecules. Recently, the expression or up-regulation of TLRs has been detected in many tumor cell lines or tumors, especially epithelial derived cancers. Although the TLR profile varies on different tumor cells, the current evidences indicate that the expression of TLRs is functionally associated with tumor progression. TLR expression may promote malignant transformation of epithelial cells. Engagement of TLRs increases tumor growth and tumor immune escape, and induces apoptosis resistance and chemoresistance in some tumor cells. These findings demonstrate that TLR is a promising target for the development of anticancer drugs and make TLR agonists or antagonists the potential agents for tumor therapy.

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Abbreviations

BCGCWS:

Bacillus Calmette-Guerin cell wall skeleton

CLL:

Chronic lymphocytic leukemia

CpG:

Deoxycytidyl-phosphate-deoxyguanosine

DC:

Dendritic cells

HMGB1:

High-mobility-group box 1

iNOS:

Inducible nitric oxide synthase

IRAK:

IL-1R-associated kinase

IRF-3:

IFN regulatory factor 3

Lm:

Listeria monocytogenes

LPS:

Lipopolysaccharide

MyD88:

Myeloid differentiation primary-response protein 88

PAMPs:

Pathogen-associated molecular patterns

Poly(I:C):

Polyinosine-polycytidylic acid

TIR:

Toll/interleukin-1 receptor

TLRs:

Toll-like receptors

TRAM:

TRIF-related adaptor molecule

TRAF6:

Tumor necrosis factor receptor-associated factor-6

TRIF:

TIR-domain-containing adaptor inducing IFN-β

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Yu, L., Chen, S. Toll-like receptors expressed in tumor cells: targets for therapy. Cancer Immunol Immunother 57, 1271–1278 (2008). https://doi.org/10.1007/s00262-008-0459-8

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