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Related Experiment Videos

Class-specific immunoadsorption purification for polycyclic aromatic hydrocarbon-DNA adducts

E D Booth1, J P Aston, P T van den Berg

  • 1Shell Research Ltd, Sittingbourne Research Centre, Kent, UK.

Carcinogenesis
|October 1, 1994
PubMed
Summary

A novel immunoenrichment method detects polycyclic aromatic hydrocarbon (PAH)-DNA adducts at low levels. This antibody recognizes a broad range of PAH adducts, aiding in identifying genotoxic exposures.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Environmental Health

Background:

  • Polycyclic aromatic hydrocarbons (PAHs) are environmental pollutants that can form DNA adducts, potentially leading to genotoxicity.
  • Detecting and identifying low-abundance PAH-DNA adducts is crucial for assessing exposure and health risks.
  • Existing methods for adduct detection often lack the sensitivity and specificity required for complex biological samples.

Purpose of the Study:

  • To develop and validate an immunoenrichment procedure for the sensitive detection and identification of a broad range of polycyclic aromatic hydrocarbon (PAH)-DNA adducts.
  • To assess the cross-reactivity and specificity of a monoclonal antibody raised against a specific benzo[a]pyrene diol epoxide (BPDE)-DNA adduct.
  • To evaluate the utility of the antibody in purifying low-abundance PAH-DNA adducts from complex mixtures.

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Main Methods:

  • Development of a monoclonal antibody against a specific polycyclic aromatic hydrocarbon-deoxyguanosine adduct (anti-BPDE-N2-dG).
  • Testing the antibody's cross-reactivity against various polycyclic aromatic hydrocarbon diol-epoxide modified DNA, proteins, and DNA hydrolysates.
  • Immobilization of the antibody on Sepharose 4B for immunoadsorption purification of adducted nucleotides and DNA adducts from mouse skin samples.

Main Results:

  • The monoclonal antibody demonstrated broad recognition of DNA adducts formed by diol-epoxides of benzo[a]pyrene, benz[a]anthracene, chrysene, dibenz[a,h]anthracene, and picene.
  • The antibody showed cross-reactivity with tetraol derivatives and recognized polycyclic aromatic hydrocarbon adducts on human globin.
  • Immobilized antibody effectively enriched benzo[a]pyrene adducts from DNA hydrolysates at a level of 1 adduct per 10(10) normal nucleotides and purified mixed adducts from mouse skin.

Conclusions:

  • The developed immunoenrichment procedure, utilizing a class-specific monoclonal antibody, is highly effective for detecting and identifying low-abundance polycyclic aromatic hydrocarbon-DNA adducts.
  • This method shows promise for monitoring human exposure to polycyclic aromatic hydrocarbons by enabling the identification of genotoxic components in complex mixtures.
  • The antibody's performance characteristics suggest its suitability for sensitive and specific analysis of polycyclic aromatic hydrocarbon-DNA adducts in environmental and biological samples.