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Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado Health Sciences Center, Denver, Colorado 80262
Endotoxemia produces
elevations in catecholamine levels in the pulmonary and systemic
circulation as well as rapid increases in neutrophil number and
proinflammatory cytokine expression in the lungs. In the present
experiments, we examined the effects of endogenous and exogenous
adrenergic stimulation on endotoxin-induced lung neutrophil
accumulation and activation. Levels of interleukin (IL)-1
, tumor necrosis factor (TNF)-
, and macrophage
inflammatory protein (MIP)-2 mRNAs were increased in lung neutrophils
from endotoxemic mice compared with those present in lung neutrophils from control mice or in peripheral blood neutrophils from endotoxemic or control mice. Treatment with the
-adrenergic antagonist
propranolol before endotoxin administration did not affect trafficking
of neutrophils to the lungs or the expression of IL-1
, TNF-
, or MIP-2 by lung neutrophils. Administration of the
-adrenergic antagonist phentolamine before endotoxemia did not alter lung neutrophil accumulation as measured by myeloperoxidase (MPO) levels but
did result in significant increases in IL-1
, TNF-
, and MIP-2 mRNA
expression by lung neutrophils compared with endotoxemia alone.
Administration of the
1-adrenergic agonist
phenylephrine before endotoxin did not affect trafficking of
neutrophils to the lungs but was associated with significantly
increased expression of TNF-
and MIP-2 mRNAs by lung neutrophils
compared with that found after endotoxin alone. In contrast, treatment
with the
2-adrenergic agonist
UK-14304 prevented endotoxin-induced increases in lung MPO and lung
neutrophil cytokine mRNA levels. The suppressive effects of UK-14304 on
endotoxin-induced increases in lung MPO were not affected by
administration of the nitric oxide synthase inhibitor
N-nitro-L-arginine
methyl ester. These data demonstrate that the initial accumulation and
activation of neutrophils in the lungs after endotoxemia can be
significantly diminished by
2-adrenergic stimulation.
Therapy with
2-adrenergic
agents may have a role in modulating inflammatory pulmonary processes
associated with sepsis-induced acute lung injury.
lipopolysaccharide;
-adrenergic;
-adrenergic; acute lung
injury; propranolol; phentolamine; UK-14304; phenylephrine; nitric
oxide
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