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- W2891657659 abstract "The central goal of this study was to identify the primary mechanisms triggering steroid atrophy. Adaptations of soleus (Sol) and vastus lateralis (VL) muscles of C57BL/6 female mice were studied following 3, 7 and 15 days of daily intraperitoneal injection (5 mg kg-1 day-1) of dexamethasone (dEx) (chronic treatment) and 1, 3 and 10 hours after a single dEx injection (acute treatment). In the chronic treatment, analyses were performed 24 hours after the last injection. Gene expression of major components of the intracellular signalling pathways controlling mass and metabolism were assessed. Analyses were repeated following dEx and unacylated ghrelin (uAG) (100 μg kg-1day-1), co-administration. We found a significant VL fibres atrophy after 7 (13%) and 15 (28%) days and a Sol fibres atrophy (23%) after 15 days of dEx treatment. The acute treatment showed, in both muscles, several responses in most signalling pathways, among which the enhanced gene expression of Murf-1 (6-fold change in VL and 3-fold in Sol) and myostatin (6-fold change in VL and 20-fold in Sol). In Sol, uAG administration was able to fully counteract muscle atrophy and Murf-1 upregulation, but not the upregulation of myostatin, suggesting a causal relationship between muscle atrophy and Murf-1. Results indicate that: a) the primary mechanism triggering steroid atrophy is an early transient activation of Murf-1; b) uAG inhibits Murf-1 induction counteracting steroid atrophy. The present work contributes to the understanding of the complexity of the muscle response to glucocorticoids." @default.
- W2891657659 created "2018-09-27" @default.
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- W2891657659 date "2018-04-01" @default.
- W2891657659 modified "2023-10-18" @default.
- W2891657659 title "Structural and molecular adaptations to dexamethasone and unacylated ghrelin administration in skeletal muscle of the mice." @default.
- W2891657659 doi "https://doi.org/10.26402/jpp.2018.2.14" @default.
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