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18 May 2018 Porphyromonas gingivalis strain-dependent inhibition of uterine spiral artery remodeling in the pregnant rat
Priscilla Phillips, Mary B. Brown, Ann Progulske-Fox, Xiao-Jun Wu, Leticia Reyes
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Abstract

Porphyromonas gingivalis (Pg) is an important periodontal pathogen that is also implicated in pregnancy complications involving defective deep placentation (DDP). We hypothesized that Pg invasion of the placental bed promotes DDP. Pregnant rats were intravenously inoculated with sterile vehicle, Pg strain W83, or A7436 at gestation day (GD) 14 (acute cohort). Nonpregnant rats received repeated oral inoculations for 3 months before breeding (chronic cohort). Tissues and/or sera were collected at GD18 for analysis. Pg infection status was determined by seroconversion (chronic cohort) and by presence of Pg antigen in utero-placental tissues processed for histology and morphometric assessment of spiral artery remodeling. Mesometrial tissues from seropositive dams were analyzed for expression of interleukin 1β, 6, and 10, TNF, TGF-β, follistatin-related protein 3, and inhibin beta A chain since these genes regulate extravillous trophoblast invasion. The in situ distribution of W83 and A7436 antigen in utero-placental tissues was similar in both cohorts. In the acute cohort, mesometrial stromal necrosis was more common with W83, but arteritiswas more common with A7436 infection (P < 0.05). Increased vascular necrosiswas seen in mesometrium of chronically infected groups (P < 0.05). Only A7436-infected animals had increased fetal deaths, reduced spiral artery remodeling, reduced inhibin beta A expression, and an increased proportion of FSLT3 positive extravillous trophoblasts within spiral arteries. While infection with both Pg strains produced varying pathology of the deep placental bed, only infection with strain A7436 resulted in impaired spiral artery remodeling.

Summary Sentence

Invasion of the placental bed by Porphyromonas gingivalis impairs spiral artery remodeling and increases fetal loss in a microbial strain-dependent manner.

Published by Oxford University Press on behalf of Society for the Study of Reproduction 2018. This work is written by (a) US Government employee(s) and is in the public domain in the US.
Priscilla Phillips, Mary B. Brown, Ann Progulske-Fox, Xiao-Jun Wu, and Leticia Reyes "Porphyromonas gingivalis strain-dependent inhibition of uterine spiral artery remodeling in the pregnant rat," Biology of Reproduction 99(5), 1045-1056, (18 May 2018). https://doi.org/10.1093/biolre/ioy119
Received: 10 January 2018; Accepted: 16 May 2018; Published: 18 May 2018
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KEYWORDS
metrial triangle
Porphyromonas gingivalis
rat pregnancy
spiral artery
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