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2005 ; 79
(18
): 11716-23
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Borna disease virus replication in organotypic hippocampal slice cultures from
rats results in selective damage of dentate granule cells
#MMPMID16140749
Mayer D
; Fischer H
; Schneider U
; Heimrich B
; Schwemmle M
J Virol
2005[Sep]; 79
(18
): 11716-23
PMID16140749
show ga
In the hippocampus of Borna disease virus (BDV)-infected newborn rats, dentate
granule cells undergo progressive cell death. BDV is noncytolytic, and the
pathogenesis of this neurodevelopmental damage in the absence of immunopathology
remains unclear. A suitable model system to study early events of the pathology
is lacking. We show here that organotypic hippocampal slice cultures from newborn
rat pups are a suitable ex vivo model to examine BDV neuropathogenesis. After
challenging hippocampal slice cultures with BDV, we observed a progressive loss
of calbindin-positive granule cells 21 to 28 days postinfection. This loss was
accompanied by reduced numbers of mossy fiber boutons when compared to
mock-infected cultures. Similarly, the density of dentate granule cell axons, the
mossy fiber axons, appeared to be substantially reduced. In contrast, hilar mossy
cells and pyramidal neurons survived, although BDV was detectable in these cells.
Despite infection of dentate granule cells 2 weeks postinfection, the axonal
projections of these cells and the synaptic connectivity patterns were comparable
to those in mock-infected cultures, suggesting that BDV-induced damage of granule
cells is a post-maturation event that starts after mossy fiber synapses are
formed. In summary, we find that BDV infection of rat organotypic hippocampal
slice cultures results in selective neuronal damage similar to that observed with
infected newborn rats and is therefore a suitable model to study BDV-induced
pathology in the hippocampus.