Neuroinflammation and structural injury of the fetal ovine brain following intra-amniotic Candida albicans exposure

D.R.M.G. Ophelders, R. Gussenhoven, M. Lammens, B. Küsters, Matthew Kemp, John Newnham, Matt Payne, Suhas Kallapur, Alan Jobe, L.J. Zimmermann, Boris Kramer, T.G.A.M. Wolfs

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12 Citations (Scopus)

Abstract

© 2016 Ophelders et al.Background: Intra-amniotic Candida albicans (C. Albicans) infection is associated with preterm birth and high morbidity and mortality rates. Survivors are prone to adverse neurodevelopmental outcomes. The mechanisms leading to these adverse neonatal brain outcomes remain largely unknown. To better understand the mechanisms underlying C. albicans-induced fetal brain injury, we studied immunological responses and structural changes of the fetal brain in a well-established translational ovine model of intra-amniotic C. albicans infection. In addition, we tested whether these potential adverse outcomes of the fetal brain were improved in utero by antifungal treatment with fluconazole. Methods: Pregnant ewes received an intra-amniotic injection of 107 colony-forming units C. albicans or saline (controls) at 3 or 5 days before preterm delivery at 0.8 of gestation (term ~ 150 days). Fetal intra-amniotic/intra-peritoneal injections of fluconazole or saline (controls) were administered 2 days after C. albicans exposure. Post mortem analyses for fungal burden, peripheral immune activation, neuroinflammation, and white matter/neuronal injury were performed to determine the effects of intra-amniotic C. albicans and fluconazole treatment. Results: Intra-amniotic exposure to C. albicans caused a severe systemic inflammatory response, illustrated by a robust increase of plasma interleukin-6 concentrations. Cerebrospinal fluid cultures were positive for C. albicans in the majority of the 3-day C. albicans-exposed animals whereas no positive cultures were present in the 5-day C. albicans-exposed and fluconazole-treated animals. Although C. albicans was not detected in the brain parenchyma, a neuroinflammatory response in the hippocampus and white matter was seen which was characterized by increased microglial and astrocyte activation. These neuroinflammatory changes were accompanied by structural white matter injury. Intra-amniotic fluconazole reduced fetal mortality but did not attenuate neuroinflammation
Original languageEnglish
Pages (from-to)article number 29
JournalJournal of Neuroinflammation
Volume13
Issue number1
DOIs
Publication statusPublished - 2016

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