Seymour BWP, Peake JL, Pinkerton KE, Kurup VP, Gershwin LJ. Second-hand smoke increases nitric oxide and alters the IgE response in a murine model of allergic aspergillosis.
Clin Dev Immunol 2005;
12:113-24. [PMID:
16050142 PMCID:
PMC2270730 DOI:
10.1080/17402520500116806]
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Abstract
This study was performed to determine the effects of environmental
tobacco smoke (ETS) on nitric oxide (NO) and immunoglobulin (Ig) production in
a murine model of allergic bronchopulmonary aspergillosis (ABPA). Adult
BALB/c mice were exposed to aged and diluted sidestream cigarette smoke
from day 0 through day 43 to simulate “second-hand
smoke”. During exposure,
mice were sensitized to soluble Aspergillus fumigatus (Af)
antigen intranasally
between day 14 and 24. All Af sensitized mice in ambient air (Af + AIR) made
elevated levels of IgE, IgG1, IgM, IgG2a and IgA. Af sensitized mice housed in
ETS (Af + ETS) made similar levels of immunoglobulins except for IgE that was
significantly reduced in the serum and bronchoalveolar lavage (BAL). However,
immunohistochemical evaluation of the lung revealed a marked accumulation of
IgE positive cells in the lung parenchyma of these Af + ETS mice. LPS stimulation
of BAL cells revealed elevated levels of NO in the Af + AIR group, which was further
enhanced in the Af+ETS group. In vitro restimulation of the BAL cells on day 45
showed a TH0 response with elevated levels of IL3, 4, 5, 10 and IFN-γ. However,
by day 28 the response shifted such that TH2 cytokines increased while
IFN-γ decreased. The Af + ETS group showed markedly reduced levels in all
cytokines tested, including the inflammatory cytokine IL6, when compared to
the Af+AIR group. These results demonstrate that ETS affects ABPA by further
enhancing the NO production and reduces
the TH2 and the inflammatory cytokines while altering the pattern of IgE responses.
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