Skip to Main content Skip to Navigation
Journal articles

Pro-epileptogenic effects of viral-like inflammation in both mature and immature brains

Abstract : AbstractBackgroundInfectious encephalitides are most often associated with acute seizures during the infection period and are risk factors for the development of epilepsy at later times. Mechanisms of viral encephalitis-induced epileptogenesis are poorly understood. Here, we evaluated the contribution of viral encephalitis-associated inflammation to ictogenesis and epileptogenesis using a rapid kindling protocol in rats. In addition, we examined whether minocycline can improve outcomes of viral-like brain inflammation.MethodsTo produce viral-like inflammation, polyinosinic-polycytidylic acid (PIC), a toll-like receptor 3 (TLR3) agonist, was applied to microglial/macrophage cell cultures and to the hippocampus of postnatal day 13 (P13) and postnatal day 74 (P74) rats. Cell cultures permit the examination of the inflammation induced by PIC, while the in vivo setting better suits the analysis of cytokine production and the effects of inflammation on epileptogenesis. Minocycline (50 mg/kg) was injected intraperitoneally for 3 consecutive days prior to the kindling procedure to evaluate its effects on inflammation and epileptogenesis.ResultsPIC injection facilitated kindling epileptogenesis, which was evident as an increase in the number of full limbic seizures at both ages. Furthermore, in P14 rats, we observed a faster seizure onset and prolonged retention of the kindling state. PIC administration also led to an increase in interleukin 1β (IL-1β) levels in the hippocampus in P14 and P75 rats. Treatment with minocycline reversed neither the pro-epileptogenic effects of PIC nor the increase of IL-1β in the hippocampus in both P14 and P75 rats.ConclusionsHippocampal injection of PIC facilitates rapid kindling epileptogenesis at both P14 and P75, suggesting that viral–induced inflammation increases epileptogenesis irrespective of brain maturation. Minocycline, however, was unable to reverse the increase of epileptogenesis, which might be linked to its absence of effect on hippocampal IL-1β levels at both ages.
Document type :
Journal articles
Complete list of metadatas

Cited literature [49 references]  Display  Hide  Download

https://www.hal.inserm.fr/inserm-01415098
Contributor : Bmc Bmc <>
Submitted on : Monday, December 12, 2016 - 6:06:06 PM
Last modification on : Wednesday, August 19, 2020 - 11:18:13 AM
Long-term archiving on: : Monday, March 27, 2017 - 11:50:52 PM

Files

12974_2016_Article_773.pdf
Publication funded by an institution

Identifiers

Collections

Citation

Nina Dupuis, Andrey Mazarati, Béatrice Desnous, Vibol Chhor, Bobbi Fleiss, et al.. Pro-epileptogenic effects of viral-like inflammation in both mature and immature brains. Journal of Neuroinflammation, 2016, 13 (1), pp.307. ⟨10.1186/s12974-016-0773-6⟩. ⟨inserm-01415098⟩

Share

Metrics

Record views

588

Files downloads

875