Deakin University
Browse
brown-pgc1and-2014.pdf (1.32 MB)

PGC-1α and PGC-1β increase CrT expression and creatine uptake in myotubes via ERRα

Download (1.32 MB)
journal contribution
posted on 2014-12-01, 00:00 authored by E L Brown, Rod SnowRod Snow, Craig WrightCraig Wright, Y Cho, Marita Wallace, A Kralli, Aaron RussellAaron Russell
Intramuscular creatine plays a crucial role in maintaining skeletal muscle energy homeostasis, and its entry into the cell is dependent upon the sodium chloride dependent Creatine Transporter (CrT; Slc6a8). CrT activity is regulated by a number of factors including extra- and intracellular creatine concentrations, hormones, changes in sodium concentration, and kinase activity, however very little is known about the regulation of CrT gene expression. The present study aimed to investigate how Creatine Transporter (CrT) gene expression is regulated in skeletal muscle. Within the first intron of the CrT gene, we identified a conserved sequence that includes the motif recognized by the Estrogen-related receptor α (ERRα), also known as an Estrogen-related receptor response element (ERRE). Additional ERREs confirming to the known consensus sequence were also identified in the region upstream of the promoter. When partnered with peroxisome proliferator-activated receptor-gamma co-activator-1alpha (PGC-1α) or beta (PGC-1β), ERRα induces the expression of many genes important for cellular bioenergetics. We therefore hypothesized that PGC-1 and ERRα could also regulate CrT gene expression and creatine uptake in skeletal muscle. Here we show that adenoviral overexpression of PGC-1α or PGC-1β in L6 myotubes increased CrT mRNA (2.1 and 1.7-fold, P<0.0125) and creatine uptake (1.8 and 1.6-fold, P<0.0125), and this effect was inhibited with co-expression of shRNA for ERRα. Overexpression of a constitutively active ERRα (VP16-ERRα) increased CrT mRNA approximately 8-fold (P<0.05), resulting in a 2.2-fold (P<0.05) increase in creatine uptake. Lastly, chromatin immunoprecipitation assays revealed that PGC-1α and ERRα directly interact with the CrT gene and increase CrT gene expression.

History

Journal

Biochimica et biophysica acta (BBA) - molecular cell research

Volume

1843

Issue

12

Pagination

2937 - 2943

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

0006-3002

Language

eng

Publication classification

C Journal article

Copyright notice

2014, Elsevier