Reduced protein turnover mediates functional deficits in transgenic mice expressing the 25 kDa C-terminal fragment of TDP-43.

Abstract:

:Amyotrophic lateral sclerosis (ALS) and frontotemporal lobar degeneration (FTLD-TDP) are two neurodegenerative disorders characterized by the accumulation of TDP-43. TDP-43 is proteolitically cleaved to generate two major C-terminal fragments of 35 and 25 kDa. The latter, known as TDP-25, is a consistent feature of FTLD-TDP and ALS; however, little is known about its role in disease pathogenesis. We have previously developed transgenic mice overexpressing low levels of TDP-25 (TgTDP-25(+/0)), which at 6 months of age show mild cognitive impairments and no motor deficits. To better understand the role of TDP-25 in the pathogenesis of ALS and FTLD-TDP, we generated TDP-25 homozygous mice (TgTDP-25(+/+)), thereby further increasing TDP-25 expression. We found a gene-dosage effect on cognitive and motor function at 15 months of age, as the TgTDP-25(+/+) showed more severe spatial and working memory deficits as well as worse motor performance than TgTDP-25(+/0) mice. These behavioral deficits were associated with increased soluble levels of TDP-25 in the nucleus and cytosol. Notably, high TDP-25 levels were also linked to reduced autophagy induction and proteasome function, two events that have been associated with both ALS and FTLD-TDP. In summary, we present strong in vivo evidence that high levels of TDP-25 are sufficient to cause behavioral deficits and reduce function of two of the major protein turnover systems: autophagy and proteasome. These mice represent a new tool to study the role of TDP-25 in the pathogenesis of ALS and FTLD-TDP.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Caccamo A,Shaw DM,Guarino F,Messina A,Walker AW,Oddo S

doi

10.1093/hmg/ddv193

subject

Has Abstract

pub_date

2015-08-15 00:00:00

pages

4625-35

issue

16

eissn

0964-6906

issn

1460-2083

pii

ddv193

journal_volume

24

pub_type

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