MyD88 and TLR2, but not TLR4, are required for host defense against Cryptococcus neoformans.

Abstract:

:We investigated here the potential role of Toll-like receptors (TLR) and the adaptor protein MyD88 in innate immunity responses to Cryptococcus neoformans, a pathogenic encapsulated yeast. Peritoneal macrophages from MyD88(-/-) or TLR2(-/-) mice released significantly less TNF-alpha, compared with wild-type controls, after in vitro stimulation with whole yeasts. In contrast, no differences in TNF-alpha release were noted between macrophages from C3H/HeJ mice, which have a loss of function mutation in TLR4, relative to C3H/HeN controls. When MyD88- or TLR2-deficient mice were infected with low doses of the H99 serotype A strain, all of the control animals, but none of MyD88(-/-) and only 38% of the TLR2(-/-) animals survived, in association with higher fungal burden in the mutant mice. Both MyD88(-/-) and TLR2(-/-) animals showed decreased TNF-alpha, IL-12p40 and/or IFN-gamma expression in various organs during infection. No difference in susceptibility to experimental cryptococcosis was found between C3H/HeJ mice and C3H/HeN controls. In conclusion, our data indicate that TLR2 and MyD88, but not TLR4, critically contribute to anti-cryptococcal defenses through the induction of increased TNF-alpha, IL-12 and IFN-gamma expression.

journal_name

Eur J Immunol

authors

Biondo C,Midiri A,Messina L,Tomasello F,Garufi G,Catania MR,Bombaci M,Beninati C,Teti G,Mancuso G

doi

10.1002/eji.200425799

keywords:

subject

Has Abstract

pub_date

2005-03-01 00:00:00

pages

870-8

issue

3

eissn

0014-2980

issn

1521-4141

journal_volume

35

pub_type

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