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Related Experiment Videos

Links between pollen, atopy and the asthma epidemic.

Philip E Taylor1, Kraig W Jacobson, James M House

  • 1School of Botany, University of Melbourne, Parkville, Australia. taylor@caltech.edu

International Archives of Allergy and Immunology
|May 31, 2007
PubMed
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Pollen allergy is common in asthma patients. This review explores how tiny pollen fragments, not whole grains, may trigger asthma by causing inflammation and interacting with other airborne particles.

Area of Science:

  • Allergology
  • Environmental Health
  • Pulmonology

Background:

  • Pollen allergy is prevalent in 80-90% of childhood asthmatics and 40-50% of adult-onset asthmatics.
  • A direct causal link between allergic responses and asthma remains unclear, as pollen grains are too large for small airways.

Purpose of the Study:

  • To review the mechanisms of pollen fragmentation.
  • To explore the pathophysiology of asthma induced by pollen fragments.

Main Methods:

  • Review of existing literature on pollen fragmentation and asthma.
  • Analysis of atmospheric conditions and pollen allergen levels.
  • Examination of the role of pollen components and interactions with other pollutants.

Main Results:

Related Experiment Videos

  • Pollen grains rupture, releasing respirable cytoplasmic fragments that may correlate with asthma exacerbations.
  • Moist weather during flowering correlates with peak grass and birch pollen allergen levels.
  • Pollen fragments contain oxidases and lipid mediators contributing to inflammation; interactions with combustion products may enhance immune responses.

Conclusions:

  • Pollen fragments, not whole grains, are likely implicated in allergic asthma.
  • Atmospheric interactions of pollen fragments with pollutants may influence asthma severity.
  • Further research is needed to understand how pollen and fungal fragments modulate allergic asthma.