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Sinularin Induces Apoptosis through Mitochondria Dysfunction and Inactivation of the pI3K/Akt/mTOR Pathway in Gastric

Yu-Jen Wu1,2, Bing-Sang Wong3, Shu-Hao Yea4

  • 1Department of Food Science and Nutrition, Meiho University, Pingtung 91202, Taiwan. x00002180@meiho.edu.tw.

Marine Drugs
|July 30, 2016
PubMed

Insights

Sinularin, a compound from soft coral, effectively inhibits gastric cancer cell growth and triggers programmed cell death (apoptosis) through a mitochondria-mediated pathway. This natural compound shows promise for future cancer therapies.

Area of Science:

  • Marine Natural Products Chemistry
  • Cancer Biology
  • Cellular Signaling

Background:

  • Gastric cancer remains a significant global health challenge with limited effective therapeutic options.
  • Marine organisms, such as soft corals, are a rich source of novel bioactive compounds with potential anticancer properties.

Purpose of the Study:

  • To investigate the anticancer effects of sinularin, a compound isolated from the soft coral Sinularia flexibilis.
  • To elucidate the mechanisms underlying sinularin-induced cell death in human gastric cancer cell lines.

Main Methods:

  • Treatment of human gastric cancer cell lines (AGS and NCI-N87) with varying concentrations of sinularin.
  • Assessment of cell proliferation and apoptosis using standard assays.
  • Analysis of mitochondrial membrane potential, cytochrome C release, and expression of key apoptosis-related proteins (Bax, Bad, caspase-3/9, p-Bad, Bcl-xL, Bcl-2).
  • Investigation of the phosphoinositol 3-kinase/Akt/mechanistic target of the rapamycin (PI3K/Akt/mTOR) signaling pathway.

Main Results:

  • Sinularin significantly suppressed gastric cancer cell proliferation in a dose-dependent manner.
  • Sinularin induced apoptosis, evidenced by loss of mitochondrial membrane potential and release of cytochrome C.
  • Activation of pro-apoptotic proteins (Bax, Bad, caspase-3/9) and suppression of anti-apoptotic proteins (p-Bad, Bcl-xL, Bcl-2) were observed.
  • Sinularin inhibited the PI3K/Akt/mTOR signaling pathway.

Conclusions:

  • Sinularin-induced apoptosis in gastric cancer cells is mediated by the mitochondria-dependent pathway and caspase activation.
  • The PI3K/Akt/mTOR pathway is implicated in sinularin's mechanism of action.
  • Sinularin demonstrates potential as a chemotherapeutic agent for human gastric cancer, warranting further investigation.
Keywords:
apoptosisgastric cancermitochondrial dysfunctionsinularin

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