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Published on: February 25, 2016

A proposed sequence of events for cadmium-induced mitochondrial impairment

Daniel J Dorta1, Samara Leite, Kátia C DeMarco

  • 1Department of Physics and Chemistry, Faculty of Pharmaceutical Sciences, University of São Paulo, Av. Café s/n, 14040-903 Ribeirão Preto, São Paulo, Brazil.

Journal of Inorganic Biochemistry
|September 27, 2003
PubMed

Insights

Cadmium exposure damages mitochondria by disrupting their energy production and increasing oxidative stress. This study details the sequence of events leading to cadmium-induced mitochondrial dysfunction and cell damage.

Area of Science:

  • Biochemistry
  • Toxicology
  • Cell Biology

Background:

  • Cadmium is a significant environmental toxicant.
  • Mitochondria are a likely target for cadmium's cytotoxic effects.
  • Understanding cadmium's impact on mitochondrial function is crucial.

Purpose of the Study:

  • To investigate the cause-and-effect relationship between cadmium exposure and mitochondrial dysfunction.
  • To elucidate the mechanisms underlying cadmium-induced changes in mitochondrial energetic and oxidative status.
  • To propose a sequence of events in cadmium-induced mitochondrial impairment.

Main Methods:

  • Incubation of rat liver mitochondria with cadmium chloride (CdCl2).
  • Use of inhibitors and modulators like N-ethylmaleimide (NEM), butylhydroxytoluene (BHT), ruthenium red (RR), and cyclosporine A+ADP.
  • Measurement of mitochondrial energetic status, oxidative stress, and membrane integrity.

Main Results:

  • Cadmium interacts with mitochondrial membrane thiols, stimulating calcium uptake via the Ca2+ uniporter.
  • Cadmium induces mitochondrial permeability transition (MPT), dissipating the transmembrane electrical potential (Deltapsi) and causing uncoupling.
  • Early ATP level depression, followed by respiratory chain inhibition, reactive oxygen species generation, and lipid peroxidation.

Conclusions:

  • Cadmium initiates mitochondrial damage through thiol interaction and calcium influx.
  • The cascade involves MPT, energy depletion, oxidative stress, and lipid peroxidation.
  • This sequence explains cadmium's cytotoxicity and mitochondrial targeting.

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