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Ann Allergy Asthma Immunol. 2007 Jan;98(1):75-82.

Circadian changes in granulocyte-macrophage colony-stimulating factor message in circulating eosinophils.

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  • 1Waisman Center for Developmental Disabilities, Madison, Wisconsin, USA.

Abstract

BACKGROUND:

Granulocyte-macrophage colony-stimulating factor (GM-CSF), which stimulates eosinophil recruitment, activation, and survival, is expressed by activated eosinophils. Although eosinophil recruitment and enhanced survival have been associated with nocturnal asthma (NA), the contribution of GM-CSF to NA is unknown.

OBJECTIVE:

To determine whether circulating eosinophil GM-CSF expression correlates with the symptoms of NA.

METHODS:

The GM-CSF messenger RNA (mRNA) expression at 4 PM and 4 AM was determined by reverse-transcriptase polymerase chain reaction with Southern blot analysis in subjects with and without NA and in controls.

RESULTS:

A total of 142 asthma subjects were screened for nocturnal asthma with 1-week home peak expiratory flow rate (PEFR) monitoring. Eleven subjects had NA (>20% diurnal variation in PEFR on 4 of 7 days), and 6 met the criteria for non-NA (<10% diurnal variation in PEFR on 7 of 7 days); 8 controls were studied. In subjects with NA, GM-CSF mRNA expression in circulating eosinophils increased 3-fold at 4 AM compared with 4 PM. Diurnal changes in GM-CSF mRNA expression were not detected in the non-NA and control groups.

CONCLUSIONS:

Day-night variation in eosinophil GM-CSF expression is associated with circadian variation in airway function in asthma, a key manifestation of asthma severity.

PMID:
17225724
[PubMed - indexed for MEDLINE]
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