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Rhabdastrellic acid-A induced autophagy-associated cell death through blocking Akt pathway in human cancer cells

Dan-Dan Li1, Jing-Feng Guo, Jia-Jia Huang

  • 1State Key Laboratory of Oncology in South China, Cancer Center, Sun Yat-Sen University, Guangzhou, China.

Plos One
|September 3, 2010
PubMed
Abstract

Insights

Rhabdastrellic acid-A, a compound from a marine sponge, inhibits cancer cell growth and triggers cell death by inducing autophagy. This process involves blocking the Akt pathway, suggesting potential as an anticancer agent.

Area of Science:

  • Marine natural products
  • Cellular biology
  • Cancer research

Background:

  • Autophagy is a crucial protein degradation pathway.
  • Dysfunctional autophagy is linked to cancer development.
  • Autophagy inducers show promise in cancer prevention and therapy.

Purpose of the Study:

  • To investigate the anticancer effects of Rhabdastrellic acid-A.
  • To determine the mechanism of Rhabdastrellic acid-A-induced cancer cell death.
  • To explore the role of autophagy in Rhabdastrellic acid-A's action.

Main Methods:

  • Tested Rhabdastrellic acid-A on human cancer cell lines (Hep3B, A549).
  • Assessed cell proliferation and induced cell death.
  • Utilized YFP-LC3 punctation and LC3-II assays to confirm autophagy.
  • Employed autophagy inhibitors (3-MA) and gene knockdown (Atg5).
  • Analyzed Akt pathway signaling (phospho-Akt) and used Akt pathway modulation.

Main Results:

  • Rhabdastrellic acid-A inhibited proliferation and induced caspase-independent cell death in Hep3B and A549 cells.
  • The compound triggered autophagy, evidenced by YFP-LC3 punctation and increased LC3-II.
  • Autophagy inhibition (3-MA, Atg5 knockdown) reduced Rhabdastrellic acid-A-induced cell death.
  • Rhabdastrellic acid-A decreased phospho-Akt levels, and active Akt blocked its effects.

Conclusions:

  • Rhabdastrellic acid-A induces autophagy-associated cell death in cancer cells by inhibiting the Akt pathway.
  • This marine-derived compound warrants further investigation as a potential anticancer or cancer preventive agent.

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