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1998 ; 20
(10
): 455-62
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English Wikipedia
Interleukin-12 suppresses filaria-induced pulmonary eosinophilia, deposition of
major basic protein and airway hyperresponsiveness
#MMPMID9797506
Mehlotra RK
; Hall LR
; Higgins AW
; Dreshaj IA
; Haxhiu MA
; Kazura JW
; Pearlman E
Parasite Immunol
1998[Oct]; 20
(10
): 455-62
PMID9797506
show ga
Tropical Pulmonary Eosinophilia (TPE) is a severe form of allergic asthma caused
by the host inflammatory response to filarial helminths in the lung
microvasculature, and is characterized by pulmonary eosinophilia, increased
filarial-specific IgG and IgE antibodies, and airway hyperresponsiveness. The
current study examined the effect of IL-12 on pulmonary eosinophilia, deposition
of eosinophil major basic protein and airway hyperresponsiveness in mice
inoculated i.v. with Brugia malayi microfilariae. Injection of recombinant murine
IL-12 modulated the T helper (Th) response in the lungs from Th2- to Th1-like,
with elevated IFN-gamma, and decreased IL-4 and IL-5 production. Consistent with
this shift in cytokine response, antigen-specific IgG2a was elevated, and IgG1
and total serum IgE were decreased. In addition, eosinophils in BAL fluid from
IL-12 treated mice were reduced from 56% to 11%, and there was no detectable MBP
on respiratory epithelial cells. Importantly, IL-12 suppressed airway
hyperresponsiveness compared with saline-injected control animals. Taken
together, these data clearly demonstrate that by modulating Th associated
cytokine production, IL-12 down-regulates filaria-induced lung immunopathology.