Foetal Ureaplasma parvum bacteraemia as a function of gestation-dependent complement insufficiency: Evidence from a sheep model of pregnancy

Matthew W. Kemp, Shatha Ahmed, Michael L. Beeton, Matthew S. Payne, Masatoshi Saito, Yuichiro Miura, Haruo Usuda, Suhas G. Kallapur, Boris W. Kramer, Sarah J. Stock, Alan H. Jobe, John P. Newnham, Owen B. Spiller*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Web of Science)

Abstract

Problem: Complement is a central defence against sepsis, and increasing complement insufficiency in neonates of greater prematurity may predispose to increased sepsis. Ureaplasma spp. are the most frequently cultured bacteria from preterm blood samples.

Method of study: A sheep model of intrauterine Ureaplasma parvum infection was used to examine in vivo Ureaplasma bacteraemia at early and late gestational ages. Complement function and Ureaplasma killing assays were used to determine the correlation between complement potency and bactericidal activity of sera ex vivo.

Results: Ureaplasma was cultured from 50% of 95-day gestation lamb cord blood samples compared to 10% of 125-day gestation lambs. Bactericidal activity increased with increased gestational age, and a direct correlation between functional complement activity and bactericidal activity (R-2=.86; P

Conclusions: Ureaplasma bacteraemia in vivo was confined to early preterm lambs with low complement function, but Ureaplasma infection itself did not diminish complement levels.

Original languageEnglish
Article number12599
Number of pages9
JournalAmerican Journal of Reproductive Immunology
Volume77
Issue number1
DOIs
Publication statusPublished - Jan 2017

Keywords

  • complement
  • neonatal
  • preterm
  • sepsis
  • Ureaplasma
  • CANDIDA-ALBICANS INFECTION
  • ESCHERICHIA-COLI
  • INFLAMMATION
  • BIRTH
  • SERUM
  • UREALYTICUM
  • EXPOSURE
  • INFANTS
  • LAMB
  • SKIN

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