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IGF-1 splice variant and IGF-1 peptide expression patterns in young and old human skeletal muscle prior to and following sequential exercise bouts
journal contribution
posted on 2017-12-06, 00:00 authored by M Roberts, Vincent DalboVincent Dalbo, K Sunderland, C Poole, S Hassell, D Bemben, J Cramer, J Stout, C KerksickGenes and proteins involved in insulin-like growth factor (IGF)-1 signaling are thought to be differentially expressed in older versus younger mammalian skeletal muscle following acute exercise. The purpose of this study was to examine how multiple bouts of conventional resistance training meant to elicit hypertrophy affect the mRNA expression of IGF-1EA and IGF-1EC (MGF) as well as the expression of total IGF-1 peptides in human skeletal muscle. Ten younger (18–25 years) and 10 older (60–75 years) males completed three sequential workouts (M, W, F) consisting of nine sets of lower body exercises with ten repetitions per set at an intensity of 80% of one repetition maximum. Vastus lateralis muscle biopsies were collected prior to intervention (T1), 48 h following workout 1 (T2), 48 h following workout 2 (T3), and 24 h following workout 3 (T4). RT-PCR was performed to assess baseline and changes in MGF and IGF-IEA mRNA. Samples were also assayed for total muscle IGF-1 peptides using ELISA-based methods. There were no baseline differences in MGF or IGF-1EA mRNA expression and IGF-1 peptides between age groups. Interestingly, MGF expression increased at T2–T4 in the older group relative to baseline values (p < 0.05), albeit muscle IGF-1EA mRNA.
Funding
Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)
History
Volume
110Issue
5Start Page
961End Page
969Number of Pages
9eISSN
1439-6327ISSN
1439-6319Location
Dusseldorf, GermanyPublisher
SpringerPublisher DOI
Full Text URL
Language
en-ausPeer Reviewed
- Yes
Open Access
- No
External Author Affiliations
Faculty of Sciences, Engineering and Health; Institute for Health and Social Science Research (IHSSR); University of Oklahoma;Era Eligible
- Yes