Mind-body interactions in the regulation of airway inflammation in asthma: A PET study of acute and chronic stress.
Level 3 - non-randomized controlled study
Non-randomized controlled experimental laboratory study comparing high vs. low chronic stress groups.
PubMed 27039241 · doi:10.1016/j.bbi.2016.03.024
What was done
Asthmatic individuals categorized into high and low chronic life stress groups underwent the Trier Social Stress Test and a matched control task. Brain metabolic activity was measured during task performance using FDG-PET. Hypothalamic-pituitary-adrenal (HPA) axis responses, salivary alpha-amylase, circulating inflammatory markers, and airway-specific proinflammatory cytokine mRNA expression were assessed.
What was found
The abstract reports no numerical values or statistical metrics. Asthmatic participants with high chronic stress showed a larger HPA-axis response to acute stress that failed to suppress inflammatory markers compared to low-stress controls. Greater anterior insula activity during acute stress was linked to down-regulation of stress-induced inflammation, whereas greater activity in the mid-insula and perigenual anterior cingulate cortex correlated with higher airway inflammation, increased alpha-amylase reactivity, and greater acute stress-induced increases in airway cell proinflammatory cytokine mRNA expression.
Why it matters
This study provides mechanistic neuroimaging evidence linking acute stress, chronic life adversity, and differential activation of insular and anterior cingulate networks to peripheral and airway inflammation in asthma.
Limits
The abstract does not state the sample size, participant demographics, baseline asthma severity, or medication use (including corticosteroids). No quantitative data, effect sizes, or p-values are reported. Group allocation was non-randomized based on baseline chronic stress levels.
Cited by
- supports The insular cortex is involved in modulating the inflammatory response in the lungs of asthmatics and responds to psychosocial influences.