Abstract:
BACKGROUND:Why severity varies in blastomycosis outbreaks remains unresolved. In experimental pulmonary blastomycosis, susceptibility varied in mouse strains. In susceptible BALB/c the response is Th-2, in immunized, resistance is associated with Th-1. Can susceptibility be redirected by IL-12? Methods, results: BALB/c bronchoalveolar and peritoneal macrophages (PM) were shown deficient in IL-12 production in response to IFN-gamma+LPS. High dose IL-12 (1 microg, subcutaneously) treatment of BALB/c infected intranasally with Blastomyces resulted in enhanced survival (P<0.008). Since IL-12 was poorly tolerated, a new protocol for infected mice, IL-12 0.1 or 0.3 microg, every other day, resulted in minimal toxicity; almost all treated mice survived (P<0.002 vs. controls). When lungs of surviving mice were cultured, the 0.1 microg regimen resulted in fewer (P<0.02) cfu. For weeks after treatment, in vitro IFN-gamma treatment enabled PM Blastomyces killing. After infection spleen cells from IL-12 treated mice produced 4-fold more IFN-gamma and 3-fold less IL-10 in response to Blastomyces. IL-10 abrogated activation of macrophages by IFN-gamma for enhanced Blastomyces killing. CONCLUSIONS:A proper IL-12 treatment protocol induces resistance (survival and decreased growth in lungs), low toxicity, macrophage responsiveness to IFN-gamma for killing Blastomyces, up-regulation of IFN-gamma and down-regulation of IL-10 production.
journal_name
Cytokinejournal_title
Cytokineauthors
Brummer E,Vinoda V,Stevens DAdoi
10.1016/j.cyto.2006.08.004subject
Has Abstractpub_date
2006-09-01 00:00:00pages
221-8issue
5-6eissn
1043-4666issn
1096-0023pii
S1043-4666(06)00248-1journal_volume
35pub_type
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