Glucocorticoid receptor expression on circulating leukocytes in healthy and asthmatic adolescents in response to exercise.

Abstract:

:BackgroundPoor aerobic fitness is associated with worsening of asthma symptoms, and fitness training may improve asthma control. The mechanism linking fitness with asthma is not known. We hypothesized that repeated bouts of exercise would lead to a downregulation of glucocorticoid receptor (GR) expression on circulating leukocytes, reflecting a reduced responsiveness to stress.MethodsIn a prospective exercise training intervention of healthy and asthmatic adolescents, GR expression in leukocytes was measured using flow cytometry in response to an acute exercise challenge before and after the exercise training intervention. Peripheral blood mononuclear cell (PBMC) gene expression of GR, GRβ, HSP70, TGFβ1, and TGFβ2 was determined using reverse-transcriptase PCR (RT-PCR).ResultsPeak VO2 increased by 14.6±2.3%, indicating an effective training (P<0.01). There was a significant difference in GR expression among leukocyte subtypes, with highest expression in eosinophils. Following the exercise training intervention, there was a significant decrease in baseline GR expression (P<0.05) in leukocyte and monocyte subtypes in both healthy and asthmatic adolescents.ConclusionsThis is the first study in adolescents to show that exercise training reduces GR expression in circulating leukocytes. We speculate that exercise training downregulates the stress response in general, manifested by decreased GR expression, and may explain why improving fitness improves asthma health.

journal_name

Pediatr Res

journal_title

Pediatric research

authors

Lu KD,Cooper D,Haddad F,Zaldivar F,Kraft M,Radom-Aizik S

doi

10.1038/pr.2017.66

subject

Has Abstract

pub_date

2017-08-01 00:00:00

pages

261-271

issue

2

eissn

0031-3998

issn

1530-0447

pii

pr201766

journal_volume

82

pub_type

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