Comparison of WTC dust size on macrophage inflammatory cytokine release in vivo and in vitro.
Weiden-MD; Naveed-B; Kwon-S; Segal-LN; Cho-SJ; Tsukiji-J; Kulkarni-R; Comfort-AL; Kasturiarachchi-KJ; Prophete-C; Cohen-MD; Chen-L-C; Rom-WN; Prezant-DJ; Nolan-A
PLoS One 2012 Jul; 7(7):e40016
BACKGROUND: The WTC collapse exposed over 300,000 people to high concentrations of WTC-PM; particulates up to ~50 mm were recovered from rescue workers' lungs. Elevated MDC and GM-CSF independently predicted subsequent lung injury in WTC-PM-exposed workers. Our hypotheses are that components of WTC dust strongly induce GM-CSF and MDC in AM; and that these two risk factors are in separate inflammatory pathways. METHODOLOGY/PRINCIPAL FINDINGS: Normal adherent AM from 15 subjects without WTC-exposure were incubated in media alone, LPS 40 ng/mL, or suspensions of WTC-PM(10-53) or WTC-PM(2.5) at concentrations of 10, 50 or 100 µg/mL for 24 hours; supernatants assayed for 39 chemokines/cytokines. In addition, sera from WTC-exposed subjects who developed lung injury were assayed for the same cytokines. In the in vitro studies, cytokines formed two clusters with GM-CSF and MDC as a result of PM(10-53) and PM(2.5). GM-CSF clustered with IL-6 and IL-12(p70) at baseline, after exposure to WTC-PM(10-53) and in sera of WTC dust-exposed subjects (n = 70) with WTC lung injury. Similarly, MDC clustered with GRO and MCP-1. WTC-PM(10-53) consistently induced more cytokine release than WTC-PM(2.5) at 100 µg/mL. Individual baseline expression correlated with WTC-PM-induced GM-CSF and MDC. CONCLUSIONS: WTC-PM(10-53) induced a stronger inflammatory response by human AM than WTC-PM(2.5). This large particle exposure may have contributed to the high incidence of lung injury in those exposed to particles at the WTC site. GM-CSF and MDC consistently cluster separately, suggesting a role for differential cytokine release in WTC-PM injury. Subject-specific response to WTC-PM may underlie individual susceptibility to lung injury after irritant dust exposure.
Medical-monitoring; Respiratory-system-disorders; Emergency-responders; Rescue-workers; Hazardous-materials; Hazardous-waste-cleanup; Airborne-dusts; Airborne-particles; Particulate-dust; Particulates; In-vitro-studies; In-vivo-studies; Pulmonary-system; Lung-cells; Lung-irritants; Cytochemistry; Cytotoxic-effects; Lung-disorders; Alveolar-cells; Risk-factors; Immune-reaction; Biomarkers; Bioassays; Serology; Humans; Dust-exposure; Cellular-function; Cellular-reactions
Anna Nolan, Division of Pulmonary, Critical Care and Sleep, New York University, School of Medicine, New York, NY, USA
Grant; Cooperative Agreement
Grant-Number-R01-OH-008280; Cooperative-Agreement-Number-U10-OH-008242; Cooperative-Agreement-Number-U10-OH-008243
Public Library of Science One
New York University School of Medicine