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Experimental Protocol for Detecting Mitochondrial Function in Hepatocytes Exposed to Organochlorine Pesticides
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Experimental Protocol for Detecting Mitochondrial Function in Hepatocytes Exposed to Organochlorine Pesticides

Published on: September 16, 2020

MAC-related mitochondrial pathway in oroxylin-A-induced apoptosis in human hepatocellular carcinoma HepG2 cells

Wei Liu1, Rong Mu, Fei-Fei Nie

  • 1Jiangsu Key Laboratory of Carcinogenesis and Intervention, China Pharmaceutical University, Nanjing 210009, People's Republic of China.

Cancer Letters
|May 29, 2009
PubMed

Insights

Oroxylin A triggers tumor cell death via the mitochondrial apoptotic pathway, specifically through the mitochondrial apoptosis-inducing channel (MAC), not the permeability transition pore (PTP). This research clarifies oroxylin A's anti-tumor mechanism.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Pharmacology

Background:

  • Oroxylin A, a flavonoid from Scutellaria baicalensis, exhibits anti-tumor properties.
  • Previous studies linked oroxylin A's efficacy to apoptosis induction.

Purpose of the Study:

  • To elucidate the precise molecular mechanism of oroxylin A-induced apoptosis in tumor cells.
  • To investigate the role of mitochondrial channels, specifically the permeability transition pore (PTP) and mitochondrial apoptosis-inducing channel (MAC), in this process.

Main Methods:

  • HepG2 cells were treated with oroxylin A.
  • Mitochondrial pathway involvement was assessed.
  • PTP and MAC involvement was investigated.
  • Bax activation, localization, and oligomerization were analyzed.
  • Bcl-2 overexpression effects were studied.

Main Results:

  • Oroxylin A induced apoptosis in HepG2 cells through the mitochondrial pathway.
  • Apoptosis occurred independently of PTP, implicating MAC.
  • Oroxylin A treatment led to Bax activation and altered subcellular localization.
  • Overexpression of Bcl-2 attenuated oroxylin A-induced apoptosis.

Conclusions:

  • Oroxylin A-induced apoptosis in HepG2 cells is mediated by the mitochondrial pathway.
  • The opening of MAC, not PTP, is crucial for activating this apoptotic cascade.
  • Bax plays a key role in oroxylin A's apoptotic effects via MAC.

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