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Published on: November 12, 2019
Exploitation of the Toll-like receptor system in cancer: a doubled-edged sword?
S D Killeen1, J H Wang, E J Andrews
1Department of Academic Surgery, National University of Ireland (NUI)/University College Cork (UCC), Cork University Hospital, Cork, Ireland.
Abstract:
The toll-like receptor (TLR) system constitutes a pylogenetically ancient, evolutionary conserved, archetypal pattern recognition system, which underpins pathogen recognition by and activation of the immune system. Toll-like receptor agonists have long been used as immunoadjuvants in anti cancer immunotherapy. However, TLRs are increasingly implicated in human disease pathogenesis and an expanding body of both clinical and experimental evidence suggests that the neoplastic process may subvert TLR signalling pathways to advance cancer progression. Recent discoveries in the TLR system open a multitude of potential therapeutic avenues. Extrapolation of such TLR system manipulations to a clinical oncological setting demands care to prevent potentially deleterious activation of TLR-mediated survival pathways. Thus, the TLR system is a double-edge sword, which needs to be carefully wielded in the setting of neoplastic disease.
Insights
The toll-like receptor (TLR) system is crucial for immune responses and cancer immunotherapy. However, cancer can hijack TLR pathways, making the system a double-edged sword requiring careful manipulation in cancer treatment.
Area of Science:
- Immunology
- Oncology
- Molecular Biology
Background:
- Toll-like receptors (TLRs) are ancient pattern recognition receptors vital for immune activation.
- TLR agonists are established immunoadjuvants in cancer immunotherapy.
- Emerging evidence links TLR signaling to cancer progression and pathogenesis.
Purpose of the Study:
- To review the dual role of TLRs in cancer.
- To explore therapeutic potential and risks of manipulating TLR pathways in oncology.
- To highlight the need for cautious application of TLR-targeting strategies.
Main Methods:
- Literature review of clinical and experimental studies on TLRs in cancer.
- Analysis of TLR signaling pathways in neoplastic processes.
- Evaluation of immunoadjuvant and pathogenetic roles of TLRs.
Main Results:
- TLRs are implicated in both anti-cancer immunity and cancer progression.
- Cancer cells can exploit TLR pathways for survival and advancement.
- Targeting TLRs presents therapeutic opportunities but carries risks of promoting cancer survival.
Conclusions:
- The TLR system is a double-edged sword in cancer, offering both therapeutic potential and risks.
- Careful manipulation of TLR pathways is essential for effective cancer immunotherapy.
- Further research is needed to safely harness TLRs against neoplastic diseases.
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