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Autophagy contributes to apoptosis in A20 and EL4 lymphoma cells treated with fluvastatin

Xu-Feng Qi1, Dong-Heui Kim, Kyu-Jae Lee

  • 1Key Laboratory for Regenerative Medicine of Ministry of Education, Ji Nan University School of Life Science and Technology, Guangzhou, 510632, People's Republic of China. qixufeng@jnu.edu.cn.

Cancer Cell International
|November 12, 2013
PubMed

Insights

Statins like fluvastatin induce lymphoma cell death by promoting apoptosis and autophagy. Inhibiting autophagy blocks this cell death, suggesting autophagy contributes to statin-induced apoptosis in lymphoma.

Area of Science:

  • Oncology
  • Cell Biology
  • Pharmacology

Background:

  • Statins are known to induce apoptosis in various cancer cells independently of cholesterol reduction.
  • The interplay between apoptosis and autophagy in statin-treated lymphoma cells is not well understood.

Purpose of the Study:

  • To investigate the role of autophagy in fluvastatin-induced apoptosis of lymphoma cells.
  • To identify the specific molecular pathways involved in fluvastatin's effects on lymphoma cells.

Main Methods:

  • Lymphoma cell lines (A20, EL4) were treated with fluvastatin.
  • Apoptosis was assessed by measuring caspase-3, Bax, Bcl-2 levels, and annexin V/PI staining.
  • Autophagy was evaluated by observing autophagosomes and LC3-II levels.
  • The effect of autophagy inhibitor 3-methyladenine (3-MA) was tested.
  • The role of HMG-CoA reductase metabolites (mevalonate, FPP, GGPP) was examined.

Main Results:

  • Fluvastatin enhanced pro-apoptotic markers (caspase-3, Bax) and reduced anti-apoptotic marker (Bcl-2).
  • Fluvastatin treatment increased annexin V positive cells and induced autophagosomes with elevated LC3-II levels.
  • Autophagy inhibition with 3-MA blocked fluvastatin-induced apoptosis.
  • Mevalonate, FPP, and GGPP reversed fluvastatin-induced apoptosis, caspase-3 activation, DNA fragmentation, and LC3-II activation.

Conclusions:

  • Autophagy plays a significant role in fluvastatin-induced apoptosis in lymphoma cells.
  • The apoptotic and autophagic effects of fluvastatin are dependent on the inhibition of HMG-CoA reductase metabolic products, including mevalonate, FPP, and GGPP.

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