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Rapamycin inhibits Toll-like receptor 4-induced pro-oncogenic function in head and neck squamous cell carcinoma

Guoxin Ren1, Jingzhou Hu1, Runxiang Wang1

  • 1Department of Oral and Maxillofacial-Head and Neck Oncology, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology and Shanghai Research Institute of Stomatology, Shanghai 200011, P.R. China.

Oncology Reports
|April 17, 2014
PubMed

Insights

Rapamycin may treat head and neck squamous cell carcinoma (HNSCC) by inhibiting Toll-like receptor 4 (TLR4) signaling. This study shows rapamycin blocks lipopolysaccharide (LPS)-induced HNSCC cell growth and spread, offering a potential therapeutic strategy.

Area of Science:

  • Oncology
  • Immunology
  • Cell Biology

Background:

  • Toll-like receptor 4 (TLR4) is implicated in head and neck squamous cell carcinoma (HNSCC) progression.
  • Rapamycin shows efficacy in vivo for HNSCC but lacks a clear in vitro mechanism.

Purpose of the Study:

  • To investigate the mechanism of rapamycin's anti-cancer effects in HNSCC.
  • To determine if rapamycin affects TLR4-mediated signaling pathways in HNSCC cells.

Main Methods:

  • HNSCC cell lines (CAL27, SCC4) were pre-treated with rapamycin, then stimulated with lipopolysaccharide (LPS).
  • Assessed cell proliferation, migration, invasion, apoptosis resistance, cytokine production, and NF-κB/p65 activation.
  • Utilized siRNA to knockdown TLR4 expression for mechanistic validation.

Main Results:

  • LPS significantly enhanced HNSCC proliferation, migration, invasion, cytokine production, and resistance to TRAIL-induced apoptosis.
  • Rapamycin pretreatment significantly inhibited LPS-induced pro-oncogenic effects.
  • Rapamycin's inhibitory effects were mediated via TLR4, confirmed by siRNA knockdown, and involved suppressing NF-κB activation.

Conclusions:

  • Rapamycin attenuates TLR4-induced pro-oncogenic effects in HNSCC.
  • This study suggests rapamycin as a potential therapeutic agent for HNSCC by targeting the TLR4 pathway.

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