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[The expression of mTOR and its substrates in oral squamous cell carcinoma]

Yi Liu1, Ming-liang Yang, Yang Zhang

  • 1Dept. of Orthodontics, College of Stomatology, China Medical University, Shenyang 110001, China.

Hua Xi Kou Qiang Yi Xue Za Zhi = Huaxi Kouqiang Yixue Zazhi = West China Journal of Stomatology
|September 24, 2004
PubMed
Abstract

Insights

The mammalian target of rapamycin (mTOR) pathway and its substrates show altered expression in oral squamous cell carcinoma, with higher mTOR and p70 S6 kinase (p70S6k) and lower 4EBP1 in poorly differentiated tumors. These findings suggest mTOR, p70S6K, and 4EBP1 are potential therapeutic targets for oral cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Oral squamous cell carcinoma (OSCC) is a prevalent malignancy.
  • The mammalian target of rapamycin (mTOR) pathway regulates cell growth and proliferation.
  • Dysregulation of mTOR signaling is implicated in various cancers.

Purpose of the Study:

  • To investigate the expression patterns of mTOR and its key substrates.
  • To correlate mTOR pathway component expression with OSCC differentiation.
  • To explore the potential of mTOR pathway molecules as therapeutic targets in OSCC.

Main Methods:

  • Reverse transcription-polymerase chain reaction (RT-PCR) was employed to assess gene expression levels.
  • Western blot analysis was used to evaluate protein expression.
  • Expression of mTOR, p70 S6 kinase (p70S6k) isoforms (alpha1, alpha2, beta1, beta2), and 4EBP1 was examined.

Main Results:

  • RT-PCR and Western blot analyses revealed significantly increased expression of mTOR and p70S6k isoforms in poorly differentiated OSCC tissues compared to well-differentiated and normal oral tissues.
  • Conversely, 4EBP1 expression was notably decreased in poorly differentiated OSCC.
  • Expression levels correlated with tumor differentiation, with normal tissues exhibiting the lowest levels of mTOR and p70S6k and highest 4EBP1.

Conclusions:

  • The expression of mTOR and its substrates, p70S6K and 4EBP1, varies significantly across different grades of oral squamous cell carcinoma.
  • These findings highlight the potential role of the mTOR pathway in OSCC pathogenesis.
  • Targeting mTOR, p70S6K, and 4EBP1 may represent a promising therapeutic strategy for oral cancer treatment.

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