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Neurochemical Research

, Volume 44, Issue 6, pp 1356–1366 | Cite as

Analysis of Motor Function in Amyloid Precursor-Like Protein 2 Knockout Mice: The Effects of Ageing and Sex

  • Phan H. Truong
  • Giuseppe D. Ciccotosto
  • Roberto CappaiEmail author
Original Paper

Abstract

The amyloid precursor protein (APP) is a member of a conserved gene family that includes the amyloid precursor-like proteins 1 (APLP1) and 2 (APLP2). APP and APLP2 share a high degree of similarity, and have overlapping patterns of spatial and temporal expression in the central and peripheral tissues, in particular at the neuromuscular junction. APP-family knockout (KO) studies have helped elucidate aspects of function and functional redundancy amongst the APP-family members. In the present study, we investigated motor performance of APLP2-KO mice and the effect sex differences and age-related changes have on motor performance. APLP2-KO and WT (on C57Bl6 background) littermates control mice from 8 (young adulthood) to 48 weeks (middle age) were investigated. Analysis of motor neuron and muscle morphology showed APLP2-KO females but not males, had less age-related motor function impairments. We observed age and sex differences in both motor neuron number and muscle fiber size distribution for APLP2-KO mice compared to WT (C57Bl6). These alterations in the motor neuron number and muscle fiber distribution pattern may explain why female APLP2-KO mice have far better motor function behaviour during ageing.

Keywords

Amyloid precursor protein Amyloid precursor-like protein Knockout Motor neurons Ageing Sex differences 

Abbreviations

AD

Alzheimer’s disease

APP

Amyloid precursor protein

APLP1

Amyloid precursor-like protein 1

APLP2

Amyloid precursor-like protein 2

EDL

Extensor digitorium longus

GA

Gastrocnemius

OCT

Optimal cutting temperature

PBS

Phosphate buffered saline

PLA

Plantaris

ROI

Regions of interest

SOL

Soleus

TA

Tibialis anterior

WT

Wildtype

Notes

Acknowledgements

This study was supported by National Health and Medical Research Council of Australia to RC. PHT was a recipient of a Nancy Frances Curry PhD Scholarship. We thank the School of Biomedical Sciences animal facility staff for assisting with animal care and handling, and the School of Biomedical Sciences Histology Facility for its resources. We thank Paul Kennedy, Alfred Health, for their assistance with the ATPase staining protocol. We thank Prof Sangram Sisodia for the APLP2 knockout mice.

Compliance with Ethical Standards

Conflict of interest

The authors declare no conflict of interest.

Ethical Approval

All applicable international, national, and institutional guidelines for the care and use of animals were followed.

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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Pharmacology and TherapeuticsThe University of MelbourneMelbourneAustralia

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