Acute changes in sputum collected from exposed human subjects in mining conditions

Simon S. Wong, Nina N. Sun, Hugh B. Miller, Mark L. Witten, Jefferey L. Burgess

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Neprilysin (NEP) is a key cell surface peptidase in the maintenance of airway homeostasis and the development of pulmonary disorders. However, little information is available about the effect of particulate matter (PM) on airway NEP. In this controlled human exposure study, changes in induced sputum were measured in 11 subjects at baseline, overshot (OS) mucking, and diesel exhaust (DE) exposure days. Neither OS condition nor DE exposure was found to induce significant changes in total protein, but DE induced significant increases in cell numbers of macrophages and epithelium. Moreover, significant increases in soluble NEP were observed following OS mining dust particulates (0.43±0.06 nmol/μg protein/min; p.023) and DE exposure (0.40±0.03 nmol/μg protein/min; p.035) when compared with the baseline control (0.30±0.04 nmol/μg protein/min), with 42% and 31% average net increase, respectively. Pearson's correlation analyses indicated that sputum NEP activity was significantly associated with personal exposure product (elemental carbon concentration [mg/m3] × time [min]; C × T). The data suggest that changes in NEP activity may be an early, accurate endpoint for airway epithelial injury and provide a new insight into the mechanism of airway effects following particulate exposure.

Original languageEnglish (US)
Pages (from-to)479-485
Number of pages7
JournalInhalation Toxicology
Volume22
Issue number6
DOIs
StatePublished - May 2010

Keywords

  • Airways
  • Diesel exhaust
  • Inflammation
  • Mining dust
  • Neprilysin
  • Particulate matter
  • Sputum

ASJC Scopus subject areas

  • Toxicology
  • Health, Toxicology and Mutagenesis

Fingerprint Dive into the research topics of 'Acute changes in sputum collected from exposed human subjects in mining conditions'. Together they form a unique fingerprint.

  • Cite this