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Cancer Prevention02:59

Cancer Prevention

Several factors can increase the risk of cancer in an individual. About 50% of cancer cases can be prevented by adopting a healthy lifestyle, regular exercise, eating healthy, and following a modest cancer prevention diet. Epidemiological studies have consistently shown that populations with vegetable and fruit-rich diets have reduced the incidence of cancer. On the other hand, populations who have a diet rich in animal fat, red meat, junk food, or high calories are predisposed to cancer.
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Cancer Prevention02:59

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The Periodic Table and Organismal Elements01:27

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The Periodic Table and Organismal Elements00:57

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Cadmium and cancer.

Andrea Hartwig1

  • 1Food Chemistry and Toxicology, Karlsruhe Institute of Technology, Karlsruhe, Germany. andrea.hartwig@kit.edu

Metal Ions in Life Sciences
|February 23, 2013
PubMed
Summary

Cadmium exposure, even at environmental levels, increases cancer risk by damaging DNA repair proteins and disrupting cellular processes. This carcinogen elevates reactive oxygen species (ROS) and promotes genomic instability, contributing to tumor development.

Area of Science:

  • Environmental toxicology
  • Carcinogenesis research
  • Molecular biology

Background:

  • Cadmium is a known human and animal carcinogen with established links to lung cancer from occupational exposure.
  • Emerging evidence suggests cadmium exposure, including environmental sources near industrial sites, may increase risks for kidney, breast, and prostate cancers.
  • The precise mechanisms underlying cadmium-induced carcinogenicity are under active investigation.

Purpose of the Study:

  • To explore the multifaceted mechanisms of cadmium carcinogenicity beyond direct DNA interaction.
  • To investigate cadmium's role in disrupting DNA repair pathways and cellular regulation.
  • To elucidate how cadmium exposure contributes to genomic instability and tumor development.

Main Methods:

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  • Review of experimental systems detecting elevated reactive oxygen species (ROS) due to cadmium exposure.
  • Analysis of cadmium's interference with proteins involved in DNA damage response, cell growth, and apoptosis.
  • Examination of cadmium's impact on nucleotide excision repair, base excision repair, and mismatch repair pathways.
  • Investigation of cadmium's interaction with zinc-binding proteins, including DNA repair proteins (XPA, PARP-1) and p53.

    • Main Results:

    • Cadmium exposure leads to elevated reactive oxygen species (ROS) levels, likely by inactivating detoxifying enzymes.
    • Cadmium disrupts critical cellular processes, including DNA repair (nucleotide excision, base excision, mismatch repair), cell growth regulation, and apoptosis resistance.
    • Proteins with zinc-binding structures, such as XPA, PARP-1, and p53, are particularly sensitive to cadmium interactions, potentially through zinc displacement or thiol group reactions.
    • Cadmium interferes with cellular redox regulation, both by increasing ROS generation and reacting with thiol groups in signaling pathways.
    • Combined mechanisms contribute to significant genomic instability in cadmium-exposed cells, promoting both tumor initiation and progression.

    Conclusions:

    • Cadmium-induced carcinogenicity involves complex mechanisms beyond direct DNA damage, including oxidative stress and disruption of DNA repair and cell cycle regulation.
    • Interference with zinc-binding proteins and cellular redox balance are key pathways in cadmium's carcinogenic action.
    • The resulting genomic instability is a critical factor in cadmium's role in tumor initiation and development, necessitating further research into exposure conditions and interactions.