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Altholactone induces reactive oxygen species-mediated apoptosis in bladder cancer T24 cells through mitochondrial

Bing Zhao1, Xiaomeng Li1

  • 1The Key Laboratory of Molecular Epigenetics of MOE, Institute of Genetics and Cytology, Northeast Normal University, Changchun, Jilin 130024, P.R. China.

Oncology Reports
|April 5, 2014
PubMed

Insights

Altholactone, a natural compound, effectively inhibits bladder cancer cell growth by inducing programmed cell death (apoptosis). This compound triggers reactive oxygen species (ROS) production, offering a potential new therapeutic avenue for bladder cancer treatment.

Area of Science:

  • Natural Products Chemistry
  • Cancer Biology
  • Pharmacology

Background:

  • Human bladder cancer is an aggressive malignancy known for its resistance to conventional chemotherapy.
  • There is a critical need for novel therapeutic agents to combat bladder cancer.
  • Altholactone, derived from Goniothalamus sp., has shown anticancer properties against various cell types, but its effect on bladder cancer remains unexplored.

Purpose of the Study:

  • To investigate the antiproliferative effects of altholactone on human bladder cancer T24 cells.
  • To elucidate the mechanisms underlying altholactone-induced cell death, including apoptosis and reactive oxygen species (ROS) generation.
  • To explore the molecular pathways involved in altholactone's action, focusing on Akt, MAPK-p38, mitochondrial potential, and Bcl-2.

Main Methods:

  • T24 bladder cancer cells were treated with varying concentrations of altholactone.
  • Cell viability was assessed using standard assays.
  • Apoptosis was evaluated through assays measuring caspase-3 activation, mitochondrial membrane potential, and Bcl-2 expression.
  • Reactive oxygen species (ROS) generation was quantified.
  • Western blotting was employed to analyze the phosphorylation status of Akt and the activation of MAPK-p38.
  • The role of ROS was investigated using the antioxidant N-acetylcysteine (NAC).

Main Results:

  • Altholactone significantly reduced T24 cell viability and induced apoptosis.
  • Treatment led to increased generation of reactive oxygen species (ROS).
  • Altholactone-induced apoptosis was linked to decreased Akt phosphorylation, activation of MAPK-p38, loss of mitochondrial membrane potential, Bcl-2 downregulation, and caspase-3 activation.
  • N-acetylcysteine (NAC) pretreatment attenuated altholactone's effects, indicating ROS-dependent apoptosis.
  • Altholactone's mechanism involves ROS generation, Akt inhibition, and MAPK-p38 activation.

Conclusions:

  • Altholactone demonstrates significant antiproliferative and pro-apoptotic effects on human bladder cancer T24 cells.
  • The mechanism of action is ROS-dependent, involving the inhibition of Akt signaling and activation of the MAPK-p38 pathway.
  • These findings support further preclinical investigation of altholactone as a potential therapeutic agent for bladder cancer.

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