Abstract:
:The eukaryotic translation initiation factor 5A (eIF5A) contains a special amino acid residue named hypusine that is required for its activity, being produced by a post-translational modification using spermidine as substrate. Stem cells from rat skeletal muscles (satellite cells) were submitted to differentiation and an increase of eIF5A gene expression was observed. Higher content of eIF5A protein was found in satellite cells on differentiation in comparison to non-differentiated satellite cells and skeletal muscle. The treatment with N1-guanyl-1,7-diaminoheptane (GC7), a hypusination inhibitor, reversibly abolished the differentiation process. In association with the differentiation blockage, an increase of glucose consumption and lactate production and a decrease of glucose and palmitic acid oxidation were observed. A reduction in cell proliferation and protein synthesis was also observed. L-Arginine, a spermidine precursor and partial suppressor of muscle dystrophic phenotype, partially abolished the GC7 inhibitory effect on satellite cell differentiation. These results reveal a new physiological role for eIF5A and contribute to elucidate the molecular mechanisms involved in muscle regeneration.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Luchessi AD,Cambiaghi TD,Hirabara SM,Lambertucci RH,Silveira LR,Baptista IL,Moriscot AS,Costa-Neto CM,Curi Rdoi
10.1002/jcp.21619subject
Has Abstractpub_date
2009-03-01 00:00:00pages
480-9issue
3eissn
0021-9541issn
1097-4652journal_volume
218pub_type
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