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Induction of apoptosis by YTX in myoblast cell lines via mitochondrial signalling transduction pathway

Mónica Suárez Korsnes1, Dyveke Lem Hetland, Arild Espenes

  • 1The Norwegian School of Veterinary Science, Food Safety and Infection Biology, Ullevaalsveien 72, P.O. Box 8146 Dep NO-0033 Oslo, Norway. Monica.Suarez@veths.no

Toxicology in Vitro : an International Journal Published in Association with BIBRA
|August 24, 2006
PubMed

Insights

Yessotoxin (YTX) triggers cell death by damaging mitochondria in rat and mouse myoblast cells. This study reveals YTX initiates apoptosis via the mitochondrial pathway, leading to cell damage and death.

Area of Science:

  • Cell Biology
  • Toxicology
  • Biochemistry

Background:

  • Yessotoxin (YTX) is a marine toxin known to induce cellular damage.
  • Apoptosis, or programmed cell death, is a critical cellular process.
  • Myoblasts are muscle precursor cells essential for muscle development and repair.

Purpose of the Study:

  • To investigate the mechanism by which Yessotoxin (YTX) induces apoptosis in myoblast cell lines.
  • To determine if YTX-mediated apoptosis involves the mitochondrial pathway.
  • To elucidate the specific mitochondrial events triggered by YTX exposure.

Main Methods:

  • Cell culture of rat L6 and mouse BC3H1 myoblast cell lines.
  • Treatment of cells with Yessotoxin (YTX).
  • Analysis of apoptosis using western blotting, electron microscopy, and fluorescent microscopy to assess mitochondrial membrane potential, cytochrome c release, and caspase activation.

Main Results:

  • Yessotoxin (YTX) exposure induced apoptotic events in both L6 and BC3H1 myoblast cell lines.
  • Evidence indicated the involvement of the mitochondrial pathway in YTX-induced apoptosis.
  • Key mitochondrial events observed include loss of mitochondrial membrane potential, swelling, and release of cytochrome c and smac/DIABLO, alongside caspase-9 activation.

Conclusions:

  • Yessotoxin (YTX) targets mitochondria to induce apoptosis in myoblasts.
  • The mechanism involves the activation of the mitochondrial pathway, leading to the release of pro-apoptotic factors.
  • These findings highlight the critical role of mitochondria in YTX toxicity and cellular response.

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