Effects of Acute Aerobic Exercise on the Early Stage of Energy Metabolism Related Gene Expression in Mouse Gastrocnemius: Microarray Analysis

Abstract

PURPOSE:The purpose of this study was to examine the infancy changes of metabolic gene expression level in mouse gastrocnemius muscle after after 1 hour acute treadmill exercise. METHODS: C57BL/6 mouse were randomly divided into control (n=5) and 1 hour acute treadmill exercise intervention group (n=5). After the intervention, we extracted total mRNA from the mouse gastrocnemius following the whole set of genes were analyzed by microarray using Affymetrix GeneChip Clariom_S_Mouse Array. The significantly meaningful differentially expressed genes (DEGs) were extracted and compared with the bioinformatic tools. Further analysis of DEGs were conducted using Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway and gene ontology database. Significant cut-off by Fold change and LPE test were used as statistical test. RESULTS:Fifty six upregulated and 65 downregulated DEGs were identified after the 1 hour of treadmill exercise. Nr4a3, Nr4a2, Btg2, Otud1, Sik1, Thbs1, Irs2 were included in the top 10 upregulated genes and Ube2l6, Scd3 were one of the most downregulated genes in the DEGs. In gene ontology analysis, metabolic process (>70 counts), organic substance metabolic process (>70) and cellular metabolic process (>60) were in the top 10 terms in the category of biological process. In the molecular function category, binding and protein binding term had more than 80s and 60s count genes each and they were statistically significant (p≤.001) with located on first and second place. In KEGG pathway enrichment analysis, many DEGs were related to MAPK signaling pathway, AMPK signaling pathway, Metabolic pathway, Protein processing in endoplasmic reticulum and Glycolysis/gluconeogenesis pathway. Also, several DEGs (HK1, HK2, Adh1 etc.) related to metabolism were statistically significant. CONCLUSIONS:One hour acute treadmill exercise could sufficiently change some energy metabolism and adaptation related genes in mouse gastrocnemius muscle. In this microarray analysis, Nr4a3, Nr4a2, Btg2, Otud1, Sik1, Thbs1, Irs2, Ube2l6, and Scd3 were newly categorized as DEGs in respect of energy metabolism.