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Expression profiling in exercised mdx suggests a role for extracellular proteins in the dystrophic muscle immune response.

Abstract：

:Duchenne muscular dystrophy (DMD) is a lethal muscle wasting disorder caused by mutations in the DMD gene that leads to the absence or severe reduction of dystrophin protein in muscle. The mdx mouse, also dystrophin deficient, is the model most widely used to study the pathology and test potential therapies, but the phenotype is milder than human DMD. This limits the magnitude and range of histological damage parameters and molecular changes that can be measured in pre-clinical drug testing. We used 3 weeks of voluntary wheel running to exacerbate the mdx phenotype. In mdx mice, voluntary exercise increased the amount of damaged necrotic tissue and macrophage infiltration. Global gene expression profiling revealed that exercise induced additional and larger gene expression changes in mdx mice and the pathways most impacted by exercise were all related to immune function or cell-extracellular matrix (ECM) interactions. When we compared the matrisome and inflammation genes that were dysregulated in mdx with those commonly differentially expressed in DMD, we found the exercised mdx molecular signature more closely resembled that of DMD. These gene expression changes in the exercised mdx model thus provide more scope to assess the effects of pre-clinical treatments. Our gene profiling comparisons also highlighted upregulation of ECM proteins involved in innate immunity pathways, proteases that can release them, downstream receptors and signaling molecules in exercised mdx and DMD, suggesting that the ECM could be a major source of pro-inflammatory molecules that trigger and maintain the immune response in dystrophic muscle.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Coles CA,Gordon L,Hunt LC,Webster T,Piers AT,Kintakas C,Woodman K,Touslon SL,Smythe GM,White JD,Lamandé SR

doi

10.1093/hmg/ddz266

subject

Has Abstract

pub_date

2020-02-01 00:00:00

pages

353-368

issue

3

eissn

0964-6906

issn

1460-2083

pii

5614192

journal_volume

29

pub_type

杂志文章

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