Decrease in CA3 inhibitory network activity during Theiler's virus encephalitis.

Abstract:

:Viral infections of the central nervous system are often associated with seizures, and while patients usually recover from the infection and the seizures cease, there is an increased lifetime incidence of epilepsy. These viral infections can result in mesial temporal sclerosis, and, subsequently, a type of epilepsy that is difficult to treat. In previous work, we have shown that Theiler's murine encephalomyelitis virus (TMEV) infections in C57B/6 mice, an animal model of virus-induced epilepsy, results in changes in excitatory currents of CA3 neurons both during the acute infection and two months later, at a time when seizure thresholds are reduced and when spontaneous seizures can occur. The changes in the excitatory system differ at these two time points, suggesting different mechanisms for seizure generation. In the present paper, we examine GABAergic mediated inhibition in CA3 pyramidal cells at these two time points following TMEV infection. We found that amplitudes of sIPSCs and mIPSCs were reduced during the acute infection, but recovered at the two-month time point. These observations are consistent with previous measurements of excitatory currents suggesting different mechanisms of seizure generation during the acute infection and during chronic epilepsy.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Smeal RM,Fujinami R,White HS,Wilcox KS

doi

10.1016/j.neulet.2015.10.032

subject

Has Abstract

pub_date

2015-11-16 00:00:00

pages

210-5

eissn

0304-3940

issn

1872-7972

pii

S0304-3940(15)30195-6

journal_volume

609

pub_type

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