Expression of thioredoxin and thioredoxin reductase in placentae of pregnant mice exposed to lipopolysaccharide.

Abstract:

:We have previously shown that thioredoxin and thioredoxin reductase were immunohistochemically localized in cytotrophoblasts, decidua and stromal cells in the stem villi of human placenta and that the addition of exogenous thioredoxin and thioredoxin reductase to mitochondrial fractions from human placenta displayed a protective effect on fumarase activity against oxidative stress. In this study, to investigate further the roles of thioredoxin and thioredoxin reductase in protecting pregnancy against oxidative stress, we examined the effect of lipopolysaccharide (LPS), which induces a variety of cytokines and produces radical oxygen species, on the expression of thioredoxin and thioredoxin reductase in mouse placenta. We focused on the placental protective effect in the second trimester, when the onset of placental dysfunction might occasionally lead to a critical state for the fetus. Thus we analysed placentae from mice on day 13 of pregnancy at various time points after they were injected with LPS (50 microg/kg i.p.) or saline as a control. The expressions of thioredoxin and thioredoxin reductase were evaluated by Western blotting and immunohistochemistry. Western blot analysis revealed that LPS approximately quadrupled the expression of both thioredoxin and thioredoxin reductase in the placentae of pregnant mice. When both proteins were localized immunohistochemically, it was found that the decidua and the diploid trophoblasts in the basal zone were intensively stained. Furthermore, the expression of 4-hydroxy-2-nonenal (HNE)-modified proteins, which are markers of oxidative stress, was enhanced in placenta by LPS. Our study suggests that the induced thioredoxin and thioredoxin reductase might protect the placenta from the stress induced by LPS.

journal_name

Placenta

journal_title

Placenta

authors

Ejima K,Koji T,Nanri H,Kashimura M,Ikeda M

doi

10.1053/plac.1999.0415

keywords:

subject

Has Abstract

pub_date

1999-09-01 00:00:00

pages

561-6

issue

7

eissn

0143-4004

issn

1532-3102

pii

S0143-4004(99)90415-0

journal_volume

20

pub_type

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