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Related Experiment Videos

Chlorpropham induces mitochondrial dysfunction in rat hepatocytes.

Yoshio Nakagawa1, Kazuo Nakajima, Toshinari Suzuki

  • 1Divisions of Pharmacology, Tokyo Metropolitan Institute of Public Health, 3-24-1 Hyakunin-cho, Shinjuku-ku, 169-0073, Japan. yoshio_1_nakagawa@member.metro.tokyo.jp

Toxicology
|June 24, 2004
PubMed
Summary

Chlorpropham (CIPC) causes cell death by depleting ATP and impairing mitochondrial function, with toxicity mediated by the parent compound, not its metabolites.

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Area of Science:

  • Toxicology
  • Biochemistry
  • Cell Biology

Background:

  • Chlorpropham (CIPC) is a post-harvest agent used to control potato sprouting.
  • Understanding CIPC's toxicological mechanisms is crucial for assessing its safety.
  • Metabolism and cellular effects of CIPC require further investigation.

Purpose of the Study:

  • To investigate the metabolism and cytotoxic mechanisms of CIPC in rat hepatocytes.
  • To elucidate the role of CIPC metabolites in its toxicity.
  • To determine the impact of CIPC on mitochondrial function and ATP production.

Main Methods:

  • Primary rat hepatocytes and isolated hepatic mitochondria were used for in vitro studies.
  • Cell viability, ATP levels, and metabolite formation (4OH-CIPC, 3CA) were measured.

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  • Mitochondrial respiration (State 3 and State 4) was assessed using various substrates.

    • Main Results:

    • CIPC induced dose- and time-dependent cell death, ATP depletion, and formation of 4OH-CIPC and 3CA.
    • SKF-525A enhanced CIPC cytotoxicity, indicating involvement of microsomal monooxygenases.
    • CIPC impaired mitochondrial oxidative phosphorylation, reducing State 3 respiration and increasing State 4, while metabolites showed minimal effects.

    Conclusions:

    • CIPC-induced cytotoxicity is primarily mediated by the parent compound, not its metabolites.
    • Toxicity is linked to rapid ATP depletion through impaired mitochondrial oxidative phosphorylation.
    • CIPC directly affects mitochondrial function, leading to cellular dysfunction.