Foetal Ureaplasma parvum bacteraemia as a function of gestation-dependent complement insufficiency: Evidence from a sheep model of pregnancy
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 (R2=.86; P<.001) was found for 95-day gestational lambs.
Conclusions
Ureaplasma bacteraemia in vivo was confined to early preterm lambs with low complement function, but Ureaplasma infection itself did not diminish complement levels.
History
Published in
American Journal of Reproductive ImmunologyPublisher
WileyVersion
- AM (Accepted Manuscript)
Citation
Kemp, M.W., Ahmed, S., Beeton, M.L., Payne, M.S., Saito, M., Miura, Y., Usuda, H., Kallapur, S.G., Kramer, B.W., Stock, S.J. and Jobe, A.H. (2017) 'Foetal Ureaplasma parvum bacteraemia as a function of gestation‐dependent complement insufficiency: Evidence from a sheep model of pregnancy', American Journal of Reproductive Immunology, 77(1), p.e12599.Print ISSN
1046-7408Electronic ISSN
1600-0897Cardiff Met Affiliation
- Cardiff School of Sport and Health Sciences
Cardiff Met Authors
Michael Beeton Mike BeetonCardiff Met Research Centre/Group
- Microbiology & Infection
Copyright Holder
- © The Publisher
Language
- en