Identification of novel, therapy responsive protein biomarkers in a mouse model of Duchenne muscular dystrophy by aptamerbased serum proteomics

Coenen-Stass AM, McClorey G, Manzano R, Betts CA, Blain A, Saleh AF, Gait MJ, Lochmüller H, Wood MJ, Roberts TC


Scientific Reports 2015 Nov 23;5:17014, November 2015
DOI: 10.1038/srep17014

Abstract

There is currently an urgent need for biomarkers that can be used to monitor the efficacy of experimental therapies for DuchenneMuscular Dystrophy (DMD) in clinical trials. Identification of novel protein biomarkers has been limited due to the massive complexity of the serum proteome and the presence of a small number of very highly abundant proteins. Here we have utilised an aptamer-based proteomics approach to profile 1,129 proteins in the serum of wild-type and mdx (dystrophin deficient) mice. Theserum levels of 96 proteins were found to be significantly altered (P < 0.001, q < 0.01) in mdx mice. Additionally, systemic treatment with a peptide-antisense oligonucleotide conjugate designed to induce Dmd exon skipping and recover dystrophin proteinexpression caused many of the differentially abundant serum proteins to be restored towards wild-type levels. Results for five leading candidate protein biomarkers (Pgam1, Tnni3, Camk2b, Cycs and Adamts5) were validated by ELISA in the mousesamples. Furthermore, ADAMTS5 was found to be significantly elevated in human DMD patient serum. This study has identified multiple novel, therapyresponsive protein biomarkers in the serum of the mdx mouse with potential utility in DMD patients.

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