Impact of Reduced Cerebellar EAAT Expression on Purkinje Cell Firing Pattern of NPC1-deficient Mice

Scientific Reports
Michael RabensteinMoritz J Frech

Abstract

Niemann-Pick disease Type C1 (NPC1) is a rare hereditary neurodegenerative disease. NPC1-patients suffer, amongst others, from ataxia, based on a loss of cerebellar Purkinje cells (PCs). Impaired expression/function of excitatory amino acid transporters (EAATs) are suspected of contributing to PC-degeneration in hereditary spinocerebellar ataxias (SCAs). Thus, we studied EAAT-expression and its impact to PC-activity in NPC1-/-mice. Western blot revealed reduced EAAT1, EAAT2, EAAT4, and βIII-spectrin levels in NPC1-/-mice. EAATs play a crucial role in synaptic transmission, thus we were interested in the impact of the reduced EAAT-expression on the function of PCs. Patch-clamp recordings of PCs showed no differences in the firing patterns of NPC1+/+and NPC1-/-mice using a low internal chloride concentration. Because EAAT4 also comprises a chloride permeable ion pore, we perturbed the chloride homeostasis using a high internal chloride concentration. We observed differences in the firing patterns of NPC1+/+and NPC1-/-mice, suggesting an impact of the altered EAAT4-expression. Additionally, the EAAT-antagonist DL-TBOA acts differently in NPC1+/+and NPC1-/-mice. Our data support the line of evidence that an altered EAAT-expression/...Continue Reading

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Citations

Nov 16, 2019·International Journal of Molecular Sciences·Anna R Malik, Thomas E Willnow
Dec 19, 2019·International Journal of Molecular Sciences·Michael RabensteinMoritz J Frech
Aug 1, 2020·International Journal of Molecular Sciences·Antony CougnouxForbes D Porter
Oct 16, 2020·Journal of Neuroinflammation·Kamyar ZahediManoocher Soleimani
Jan 16, 2021·International Journal of Molecular Sciences·Christin VölknerMoritz J Frech

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Methods Mentioned

BETA
Protein Assay
Electrophoresis
Infrared Imaging

Software Mentioned

PatchMaster
GraphPad
Mini Analysis
KEYENCE
GraphPad Prism
R

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