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α-Mangostin Reduced ER Stress-mediated Tumor Growth through Autophagy Activation

Sung-Jin Kim1, Eun-Hye Hong, Bo-Ra Lee

  • 1Laboratory of Immunology and Microbiology, College of Pharmacy, Kangwon National University, Chuncheon 200-701, Korea.

Immune Network
|February 12, 2013
PubMed

Insights

α-Mangostin, a compound from mangosteen, activates autophagy and exhibits antitumor activity in colon cancer models. This suggests autophagy activation, not ER stress reduction, is key to its anti-cancer effects.

Area of Science:

  • Natural Products Chemistry
  • Cancer Biology
  • Immunology

Background:

  • α-Mangostin, a xanthon derivative from mangosteen, shows inhibitory effects on colon cancer cell growth.
  • Its interaction with sarco/endoplasmic reticulum Ca(2+) ATPase and autophagy regulation differs from thapsigargin.
  • Understanding α-Mangostin's precise mechanism against cancer is crucial.

Purpose of the Study:

  • To investigate the role of α-Mangostin in autophagy activation and ER stress.
  • To determine the contribution of autophagy and ER stress to α-Mangostin's antitumor activity.
  • To elucidate the mechanism underlying α-Mangostin's anti-colon cancer effects.

Main Methods:

  • Oral administration of α-Mangostin to GFP-LC3 transgenic mice.
  • Assessment of autophagy activation using GFP-LC3 reporter system.
  • Evaluation of ER stress markers (XBP-1 reporter, eIF2α phosphorylation).
  • Analysis of T cell proliferation and tumor growth in a mouse colon cancer model.

Main Results:

  • α-Mangostin induced autophagy activation in mouse intestinal epithelial cells.
  • Autophagy activation by α-Mangostin did not significantly enhance OVA-specific T cell proliferation.
  • α-Mangostin significantly reduced thapsigargin-induced ER stress.
  • Coadministration of thapsigargin with α-Mangostin blocked its antitumor activity, accelerating tumor growth.

Conclusions:

  • The antitumor activity of α-Mangostin is primarily attributed to autophagy activation.
  • ER stress reduction by α-Mangostin is not the main driver of its anti-cancer effects.
  • Blocking autophagy while reducing ER stress accelerates tumor growth, highlighting the importance of autophagy in α-Mangostin's efficacy.
Keywords:
Antitumor activityAutophagyColon cancerER stressThapsigarginα-Mangostin

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