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Glucocorticosteroids.

Peter J Barnes1

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PubMed
Summary
This summary is machine-generated.

Glucocorticosteroids effectively treat asthma but not COPD due to resistance mechanisms. Research explores reversing this resistance by targeting molecular pathways like histone deacetylase-2.

Keywords:
Anti-inflammatoryCorticosteroid resistanceGlucocorticoid receptorGlucocorticoid receptor-betaHistone deacetylase-2p38 MAP kinase

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Area of Science:

  • Molecular biology
  • Pharmacology
  • Respiratory medicine

Background:

  • Glucocorticosteroids are primary anti-inflammatory asthma treatments.
  • They are less effective in Chronic Obstructive Pulmonary Disease (COPD).
  • Inflammation in asthma and COPD involves distinct molecular pathways.

Purpose of the Study:

  • To elucidate the molecular mechanisms of glucocorticoid action and resistance.
  • To identify factors contributing to reduced glucocorticoid responsiveness in asthma and COPD.
  • To explore potential therapeutic strategies for glucocorticoid resistance.

Main Methods:

  • Analysis of glucocorticoid receptor (GR) binding and transcriptional regulation (trans-repression and trans-activation).
  • Investigation of histone acetylation and deacetylation (HDAC2) in inflammatory gene expression.
  • Examination of post-translational modifications of GR and their impact on responsiveness.
  • Assessment of oxidative/nitrative stress and pi3 kinase-δ inhibition in glucocorticoid resistance.

Main Results:

  • Glucocorticoids suppress inflammatory genes via GR-mediated trans-repression involving HDAC2.
  • Glucocorticoids activate anti-inflammatory genes and side-effect genes via trans-activation.
  • Reduced GR responsiveness in severe asthma, smokers, and COPD patients is linked to GR modifications.
  • HDAC2 activity is diminished by oxidative stress and pi3 kinase-δ inhibition, causing resistance.

Conclusions:

  • Glucocorticoid resistance in COPD and severe asthma stems from molecular alterations affecting GR function and HDAC2 activity.
  • Developing drugs that enhance trans-repression or reverse resistance mechanisms is crucial.
  • Targeting these pathways may restore anti-inflammatory efficacy and reduce side effects.