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Downregulation of the Glial GLT1 Glutamate Transporter and Purkinje Cell Dysfunction in a Mouse Model of Myotonic Dystrophy.

Abstract：

:Brain function is compromised in myotonic dystrophy type 1 (DM1), but the underlying mechanisms are not fully understood. To gain insight into the cellular and molecular pathways primarily affected, we studied a mouse model of DM1 and brains of adult patients. We found pronounced RNA toxicity in the Bergmann glia of the cerebellum, in association with abnormal Purkinje cell firing and fine motor incoordination in DM1 mice. A global proteomics approach revealed downregulation of the GLT1 glutamate transporter in DM1 mice and human patients, which we found to be the result of MBNL1 inactivation. GLT1 downregulation in DM1 astrocytes increases glutamate neurotoxicity and is detrimental to neurons. Finally, we demonstrated that the upregulation of GLT1 corrected Purkinje cell firing and motor incoordination in DM1 mice. Our findings show that glial defects are critical in DM1 brain pathophysiology and open promising therapeutic perspectives through the modulation of glutamate levels.

journal_name

Cell Rep

journal_title

Cell reports

authors

Sicot G,Servais L,Dinca DM,Leroy A,Prigogine C,Medja F,Braz SO,Huguet-Lachon A,Chhuon C,Nicole A,Gueriba N,Oliveira R,Dan B,Furling D,Swanson MS,Guerrera IC,Cheron G,Gourdon G,Gomes-Pereira M

doi

10.1016/j.celrep.2017.06.006

subject

Has Abstract

pub_date

2017-06-27 00:00:00

pages

2718-2729

issue

13

issn

2211-1247

pii

S2211-1247(17)30785-4

journal_volume

19

pub_type

杂志文章

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