A streptococcal lipid toxin induces membrane permeabilization and pyroptosis leading to fetal injury.

Abstract:

:Group B streptococci (GBS) are Gram-positive bacteria that cause infections in utero and in newborns. We recently showed that the GBS pigment is hemolytic and increased pigment production promotes bacterial penetration of human placenta. However, mechanisms utilized by the hemolytic pigment to induce host cell lysis and the consequence on fetal injury are not known. Here, we show that the GBS pigment induces membrane permeability in artificial lipid bilayers and host cells. Membrane defects induced by the GBS pigment trigger K(+) efflux leading to osmotic lysis of red blood cells or pyroptosis in human macrophages. Macrophages lacking the NLRP3 inflammasome recovered from pigment-induced cell damage. In a murine model of in utero infection, hyperpigmented GBS strains induced fetal injury in both an NLRP3 inflammasome-dependent and NLRP3 inflammasome-independent manner. These results demonstrate that the dual mechanism of action of the bacterial pigment/lipid toxin leading to hemolysis or pyroptosis exacerbates fetal injury and suggest that preventing both activities of the hemolytic lipid is likely critical to reduce GBS fetal injury and preterm birth.

journal_name

EMBO Mol Med

journal_title

EMBO molecular medicine

authors

Whidbey C,Vornhagen J,Gendrin C,Boldenow E,Samson JM,Doering K,Ngo L,Ezekwe EA Jr,Gundlach JH,Elovitz MA,Liggitt D,Duncan JA,Adams Waldorf KM,Rajagopal L

doi

10.15252/emmm.201404883

subject

Has Abstract

pub_date

2015-04-01 00:00:00

pages

488-505

issue

4

eissn

1757-4676

issn

1757-4684

pii

emmm.201404883

journal_volume

7

pub_type

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