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Exercise-driven metabolic pathways in healthy cartilage.

Abstract：

OBJECTIVE:Exercise is vital for maintaining cartilage integrity in healthy joints. Here we examined the exercise-driven transcriptional regulation of genes in healthy rat articular cartilage to dissect the metabolic pathways responsible for the potential benefits of exercise. METHODS:Transcriptome-wide gene expression in the articular cartilage of healthy Sprague-Dawley female rats exercised daily (low intensity treadmill walking) for 2, 5, or 15 days was compared to that of non-exercised rats, using Affymetrix GeneChip arrays. Database for Annotation, Visualization and Integrated Discovery (DAVID) was used for Gene Ontology (GO)-term enrichment and Functional Annotation analysis of differentially expressed genes (DEGs). Kyoto Encyclopedia of Genes and Genome (KEGG) pathway mapper was used to identify the metabolic pathways regulated by exercise. RESULTS:Microarray analysis revealed that exercise-induced 644 DEGs in healthy articular cartilage. The DAVID bioinformatics tool demonstrated high prevalence of functional annotation clusters with greater enrichment scores and GO-terms associated with extracellular matrix (ECM) biosynthesis/remodeling and inflammation/immune response. The KEGG database revealed that exercise regulates 147 metabolic pathways representing molecular interaction networks for Metabolism, Genetic Information Processing, Environmental Information Processing, Cellular Processes, Organismal Systems, and Diseases. These pathways collectively supported the complex regulation of the beneficial effects of exercise on the cartilage. CONCLUSIONS:Overall, the findings highlight that exercise is a robust transcriptional regulator of a wide array of metabolic pathways in healthy cartilage. The major actions of exercise involve ECM biosynthesis/cartilage strengthening and attenuation of inflammatory pathways to provide prophylaxis against onset of arthritic diseases in healthy cartilage.

journal_name

Osteoarthritis Cartilage

journal_title

Osteoarthritis and cartilage

authors

Blazek AD,Nam J,Gupta R,Pradhan M,Perera P,Weisleder NL,Hewett TE,Chaudhari AM,Lee BS,Leblebicioglu B,Butterfield TA,Agarwal S

doi

10.1016/j.joca.2016.02.004

subject

Has Abstract

pub_date

2016-07-01 00:00:00

pages

1210-22

issue

7

eissn

1063-4584

issn

1522-9653

pii

S1063-4584(16)01025-6

journal_volume

24

pub_type

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