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Tanshinone IIA induces autophagy in colon cancer cells through MEK/ERK/mTOR pathway

Jun Qian1, Yi Cao2, Junfeng Zhang3

  • 1Department of Diagnostics of Chinese Medicine, School of Chinese Medicine, School of Integrated Chinese and Western Medicine, Nanjing University of Chinese Medicine, Nanjing, China.

Translational Cancer Research
|February 4, 2022
PubMed
Abstract

Insights

Tanshinone IIA (Tan IIA) stimulates autophagy in colon cancer cells by activating the MEK/ERK/mTOR pathway. This process inhibits colon cancer cell growth, offering a potential therapeutic strategy.

Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • Colon cancer remains a significant global health challenge, driving research for novel therapeutic agents.
  • Tanshinone IIA (Tan IIA), a component of traditional Chinese medicine, shows potential in modulating tumor development.
  • The impact of Tan IIA on autophagy in colon cancer cells was previously unreported.

Purpose of the Study:

  • To investigate the effect of Tanshinone IIA (Tan IIA) on autophagy in colon cancer cells.
  • To elucidate the molecular pathway, specifically the MEK/ERK/mTOR pathway, involved in Tan IIA-induced autophagy.
  • To assess the therapeutic potential of Tan IIA in colon cancer treatment.

Main Methods:

  • Utilized two colon cancer cell lines treated with varying concentrations and time points of Tan IIA.
  • Assessed cell viability using Cell Counting Kit-8 (CCK-8) assay.
  • Examined autophagosome formation via transmission electron microscopy and autophagy-related gene/protein expression using RT-qPCR and western blot.
  • Investigated the role of the MEK/ERK/mTOR pathway by interfering with MEK expression.

Main Results:

  • Tan IIA significantly reduced colon cancer cell viability.
  • Tan IIA treatment led to a marked increase in autophagosome formation and autophagy-related protein expression.
  • The MEK/ERK/mTOR pathway proteins showed increased expression upon Tan IIA treatment.
  • Interference with MEK expression attenuated Tan IIA-induced autophagy, confirming pathway involvement.

Conclusions:

  • Tanshinone IIA (Tan IIA) effectively stimulates autophagy in colon cancer cells.
  • The MEK/ERK/mTOR pathway is crucial for Tan IIA-mediated autophagy induction.
  • Tan IIA exhibits potential as an anti-cancer agent by inhibiting colon cancer cell growth via autophagy stimulation.
Keywords:
MEK/ERK/mTOR pathwayTanshinone IIAautophagycolon cancer cells

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