High-field diffusion tensor imaging characterization of cerebral white matter injury in lipopolysaccharide-exposed fetal sheep
| Autor: | Henrik Hagberg, Gregory A. Lodygensky, Justin M. Dean, Yohan van de Looij, Stéphane Sizonenko, Petra Susan Hüppi, François Lazeyras, Ingemar Kjellmer, Carina Mallard |
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| Rok vydání: | 2012 |
| Předmět: |
Lipopolysaccharides
Pathology medicine.medical_specialty Brain/anatomy & histology/drug effects ddc:616.0757 03 medical and health sciences 0302 clinical medicine 030225 pediatrics Animals Medicine CIBM-AIT Fetus Sheep ddc:618 medicine.diagnostic_test business.industry Cerebral white matter Brain Magnetic resonance imaging Sheep/embryology Magnetic Resonance Imaging ddc:616.8 Lipopolysaccharides/toxicity Pediatrics Perinatology and Child Health High field business 030217 neurology & neurosurgery Diffusion MRI |
| Zdroj: | Pediatric Research, Vol. 72, No 3 (2012) pp. 285-92 |
| ISSN: | 1530-0447 0031-3998 |
| DOI: | 10.1038/pr.2012.72 |
| Popis: | BACKGROUND: In gyrencephalic species such as sheep, precise anatomical and microstructural characterization of the consequences of fetal inflammation remains scarce. The goal of this study was to characterize changes in white matter (WM) structure using advanced magnetic resonance imaging (MRI) following lipopolysaccharide (LPS) exposure in the preterm-equivalent fetal sheep. METHODS: Preterm (0.7 gestation) fetal sheep received vehicle (Sham group) or LPS (LPS group), and fetal brains were collected 10 d later for subsequent ex vivo MRI. T-1-weighted (T1W), T-2-weighted (T2W), and diffusion tensor imaging (DTI) data were collected. RESULTS: Fetuses exposed to LPS exhibited reductions in WM volume and corpus callosum thickness at 10 d recovery. Characteristic patterns of diffuse and focal WM lesions (necrosis or cysts) could be identified by various T-1, T-2, and DTI signal changes. CONCLUSION: Fetal LPS exposure induces a pattern of injury characterized by diffuse and focal WM injury that closely reproduces that observed clinically in preterm infants. This work provides anatomical and microstructural MRI assessment, as well as histopathological correlates, of the consequences of LPS exposure in an animal model with a WM structure similar to that of the human brain. This work will help to further our understanding of MRI changes in preterm infants. |
| Databáze: | OpenAIRE |
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