The Potential Role of 8-Oxoguanine DNA Glycosylase-Driven DNA Base Excision Repair in Exercise-Induced Asthma

Mediators Inflamm. 2016:2016:3762561. doi: 10.1155/2016/3762561. Epub 2016 Jul 25.

Abstract

Asthma is characterized by reversible airway narrowing, shortness of breath, wheezing, coughing, and other symptoms driven by chronic inflammatory processes, commonly triggered by allergens. In 90% of asthmatics, most of these symptoms can also be triggered by intense physical activities and severely exacerbated by environmental factors. This condition is known as exercise-induced asthma (EIA). Current theories explaining EIA pathogenesis involve osmotic and/or thermal alterations in the airways caused by changes in respiratory airflow during exercise. These changes, along with existing airway inflammatory conditions, are associated with increased cellular levels of reactive oxygen species (ROS) affecting important biomolecules including DNA, although the underlying molecular mechanisms have not been completely elucidated. One of the most abundant oxidative DNA lesions is 8-oxoguanine (8-oxoG), which is repaired by 8-oxoguanine DNA glycosylase 1 (OGG1) during the base excision repair (BER) pathway. Whole-genome expression analyses suggest a cellular response to OGG1-BER, involving genes that may have a role in the pathophysiology of EIA leading to mast cell degranulation, airway hyperresponsiveness, and bronchoconstriction. Accordingly, this review discusses a potential new hypothesis in which OGG1-BER-induced gene expression is associated with EIA symptoms.

Publication types

  • Review

MeSH terms

  • Animals
  • Asthma / metabolism*
  • Bronchoconstriction
  • DNA / analysis
  • DNA Glycosylases / metabolism*
  • DNA Repair*
  • Exercise*
  • Guanine / analogs & derivatives*
  • Guanine / chemistry
  • Humans
  • Inflammation
  • Lipid Peroxidation
  • Mast Cells / cytology
  • Mice
  • Oxidative Stress
  • Physical Conditioning, Animal
  • Reactive Oxygen Species / metabolism
  • Signal Transduction

Substances

  • Reactive Oxygen Species
  • 8-hydroxyguanine
  • Guanine
  • DNA
  • DNA Glycosylases
  • Ogg1 protein, mouse