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Related Experiment Videos

Protein nitration by polluted air.

Thomas Franze1, Michael G Weller, Reinhard Niessner

  • 1Technical University of Munich, Institute of Hydrochemistry, Marchioninistrasse 17, D-81377 Munich, Germany.

Environmental Science & Technology
|April 12, 2005
PubMed
Summary

Polluted air can modify proteins, like birch pollen allergens, through nitration. This chemical change may explain how air pollution contributes to the development of allergies.

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Area of Science:

  • Environmental Science
  • Immunology
  • Biochemistry

Background:

  • The link between air pollution and allergic diseases is not fully understood.
  • Allergens are proteins that can trigger immune responses leading to allergies.
  • Traffic-related air pollution contains various chemical components.

Purpose of the Study:

  • To investigate the impact of polluted air on proteins, specifically birch pollen proteins.
  • To determine if air pollution can cause chemical modifications to allergens.
  • To explore the potential role of protein modification in air pollution-induced allergies.

Main Methods:

  • Exposure of protein samples, including birch pollen allergen Bet v 1, to urban air and synthetic gas mixtures.
  • Utilized enzyme immunoassays to quantify the degree of protein nitration.
  • Measured equivalent degrees of nitration (EDN) under various pollution conditions.

Main Results:

  • Proteins, particularly birch pollen proteins like Bet v 1, are efficiently nitrated by polluted air.
  • Nitration rates depend on the concentration of nitrogen oxides and ozone.
  • Summer smog conditions caused significant protein nitration (up to 20% EDN) within hours to days.
  • Nitrated proteins were found in environmental samples like road dust and particulate matter (up to 0.1% EDN).

Conclusions:

  • Air pollution induces protein nitration, a post-translational modification.
  • This nitration provides a molecular mechanism explaining how air pollution promotes allergies.
  • The findings highlight a significant environmental factor contributing to the rise in allergic diseases.

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