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Inducible EphA4 knockout causes motor deficits in young mice and is not protective in the SOD1G93A mouse model of ALS.

Abstract：

:Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease characterized by motor neuron loss that ultimately leads to fatal paralysis. Reducing levels or function of the tyrosine kinase, ephrin type-A receptor 4 (EphA4), has been suggested as a potential approach for slowing disease progression in ALS. Because EphA4 plays roles in embryonic nervous system development, study of constitutive knockout (KO) of EphA4 in mice is limited due to confounding phenotypes with homozygous knockout. We used a tamoxifen-inducible EphA4 conditional KO mouse to achieve strong reduction of EphA4 levels in postnatal mice to test for protective effects in the SOD1G93A model of ALS. We found that EphA4 KO in young mice, but not older adult mice, causes defects in muscle function, consistent with a prolonged postnatal role for EphA4 in adolescent muscle growth. When testing the effects of inducible EphA4 KO at different timepoints in SOD1G93A mice, we found no benefits on motor function or disease pathology, including muscle denervation and motor neuron loss. Our results demonstrate deleterious effects of reducing EphA4 levels in juvenile mice and do not provide support for the hypothesis that widespread EphA4 reduction is beneficial in the SOD1G93A mouse model of ALS.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Dominguez SL,Earr T,Dourado M,Ngu H,Meilandt WJ,Hanson JE

doi

10.1038/s41598-020-72723-y

subject

Has Abstract

pub_date

2020-09-24 00:00:00

pages

15713

issue

1

issn

2045-2322

pii

10.1038/s41598-020-72723-y

journal_volume

10

pub_type

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