Variability of sputum inflammatory mediators in COPD and α1-antitrypsin deficiency

Research output: Contribution to journalArticle

Authors

Colleges, School and Institutes

Abstract

There is inherent daily variability of sputum inflammatory mediators in stable-state patients with usual chronic obstructive pulmonary disease (COPD). The variability of pulmonary inflammation in patients with α(1)-antitrypsin deficiency (A1ATD) is unknown. Our study aimed to quantify this variability, in comparison to patients with usual COPD, in order to facilitate power calculations for proof of concept trials of putative specific anti-inflammatory agents in both groups. Sputum interleukin (IL)-8, myeloperoxidase (MPO), leukotriene B(4) (LTB(4)) and differential cell counts were measured in 12 usual COPD patients and 12 A1ATD patients on nine occasions over a 1-month period. All samples were obtained in the stable clinical state. There was significant daily variability in all mediators in all patients. A1ATD patients had higher sputum concentrations of IL-8 and LTB(4) compared with usual COPD, but lower levels of MPO and absolute neutrophil counts. Patients with usual COPD had more intra-patient variability, A1ATD patients demonstrated greater inter-patient variability. There are increased concentrations of pulmonary inflammatory mediators but fewer sputum neutrophils in A1ATD compared with usual COPD. The daily variability of inflammatory mediators and cell counts was significantly reduced in both groups by averaging sequential samples. This can be utilised to perform power calculations for future proof of concept studies; averaging three sequential samples appears optimum.

Bibliographic note

Publication in name of Alice Wood, which was the maiden name of Alice Turner

Details

Original languageEnglish
Pages (from-to)561-9
Number of pages9
JournalThe European respiratory journal
Volume40
Issue number3
Publication statusPublished - Sep 2012

Keywords

  • Adult, Aged, Cell Count, Female, Humans, Inflammation Mediators, Interleukin-8, Leukotriene B4, Male, Middle Aged, Peroxidase, Pulmonary Disease, Chronic Obstructive, Sputum, alpha 1-Antitrypsin Deficiency