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Infection-induced extracellular vesicles evoke neuronal transcriptional and epigenetic changes
Ellen Tedford (University of Leeds, University of Cambridge), Norhidayah Binti Badya (University of Leeds), Conor Laing (University of Leeds), Nozomi Asaoka (Kyoto University), Shuji Kaneko (Kyoto University), B Filippi (University of Leeds), Glenn A. McConkey (University of Leeds)
Résumé : Infection with the protozoan Toxoplasma gondii induces changes in neurotransmission, neuroinflammation, and behavior, yet it remains elusive how these changes come about. In this study we investigated how norepinephrine levels are altered by infection. TINEV (Toxoplasma-induced neuronal extracellular vesicles) isolated from infected noradrenergic cells down-regulated dopamine ß-hydroxylase (DBH) gene expression in human and rodent cells. Here we report that intracerebral injection of TINEVs into the brain is sufficient to induce DBH down-regulation and distrupt catecholaminergic signalling. Further, TINEV treatment induced hypermethylation upstream of the DBH gene. An antisense lncRNA to DBH was found in purified TINEV preparations. Paracrine signalling to induce transcriptional gene silencing and DNA methylation may be a common mode to regulate neurologic function.