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01.06.2009 | Original Article

Chronic resistance training decreases MuRF-1 and Atrogin-1 gene expression but does not modify Akt, GSK-3β and p70S6K levels in rats

verfasst von: Nelo Eidy Zanchi, Mário Alves de Siqueira Filho, Fabio Santos Lira, José Cesar Rosa, Alex Shimura Yamashita, Carla Roberta de Oliveira Carvalho, Marilia Seelaender, Antonio Herbert Lancha-Jr

Erschienen in: European Journal of Applied Physiology | Ausgabe 3/2009

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Abstract

Long-term adaptation to resistance training is probably due to the cumulative molecular effects of each exercise session. Therefore, we studied in female Wistar rats the molecular effects of a chronic resistance training regimen (3 months) leading to skeletal muscle hypertrophy in the plantaris muscle. Our results demonstrated that muscle proteolytic genes MuRF-1 and Atrogin-1 were significantly decreased in the exercised group measured 24 h after the last resistance exercise session (41.64 and 61.19%, respectively; P < 0.05). Nonetheless, when measured at the same time point, 4EBP-1, GSK-3β and eIF2Bε mRNA levels and Akt, GSK-3β and p70S6K protein levels (regulators of translation initiation) were not modified. Such data suggests that if gene transcription constitutes a control point in the protein synthesis pathway this regulation probably occurs in early adaptation periods or during extreme situations leading to skeletal muscle remodeling. However, proteolytic gene expression is modified even after a prolonged resistance training regimen leading to moderate skeletal muscle hypertrophy.

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Titel: Chronic resistance training decreases MuRF-1 and Atrogin-1 gene expression but does not modify Akt, GSK-3β and p70S6K levels in rats
verfasst von: Nelo Eidy Zanchi
Mário Alves de Siqueira Filho
Fabio Santos Lira
José Cesar Rosa
Alex Shimura Yamashita
Carla Roberta de Oliveira Carvalho
Marilia Seelaender
Antonio Herbert Lancha-Jr
Publikationsdatum: 01.06.2009
Verlag: Springer-Verlag
Erschienen in: European Journal of Applied Physiology / Ausgabe 3/2009
Print ISSN: 1439-6319
Elektronische ISSN: 1439-6327
DOI: https://doi.org/10.1007/s00421-009-1033-6

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