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2015 ; 2015
(ä): 852574
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Lipoxin Inhibits Fungal Uptake by Macrophages and Reduces the Severity of Acute
Pulmonary Infection Caused by Paracoccidioides brasiliensis
#MMPMID26635449
Ribeiro LR
; Loures FV
; de Araújo EF
; Feriotti C
; Costa TA
; Serezani CH
; Jancar S
; Calich VL
Mediators Inflamm
2015[]; 2015
(ä): 852574
PMID26635449
show ga
Cysteinyl leukotrienes (CysLTs) and lipoxins (LXs) are lipid mediators that
control inflammation, with the former inducing and the latter inhibiting this
process. Because the role played by these mediators in paracoccidioidomycosis was
not investigated, we aimed to characterize the role of CysLT in the pulmonary
infection developed by resistant (A/J) and susceptible (B10.A) mice. 48 h after
infection, elevated levels of pulmonary LTC4 and LXA4 were produced by both mouse
strains, but higher levels were found in the lungs of susceptible mice. Blocking
the CysLTs receptor by MTL reduced fungal loads in B10.A, but not in A/J mice. In
susceptible mice, MLT treatment led to reduced influx of PMN leukocytes,
increased recruitment of monocytes, predominant synthesis of anti-inflammatory
cytokines, and augmented expression of 5- and 15-lipoxygenase mRNA, suggesting a
prevalent LXA4 activity. In agreement, MTL-treated macrophages showed reduced
fungal burdens associated with decreased ingestion of fungal cells. Furthermore,
the addition of exogenous LX reduced, and the specific blockade of the LX
receptor increased the fungal loads of B10.A macrophages. This study showed for
the first time that inhibition of CysLTs signaling results in less severe
pulmonary paracoccidioidomycosis that occurs in parallel with elevated LX
activity and reduced infection of macrophages.