Regulation of the early expression of MAFbx/atrogin-1 and MuRF1 through membrane-initiated cortisol action in the skeletal muscle of rainbow trout
| Autor: | Alfredo Molina, Juan Antonio Valdés, Daniela Aravena-Canales, Jorge E. Aedo |
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| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Fish Proteins endocrine system medicine.medical_specialty Hydrocortisone Physiology Biology Biochemistry 03 medical and health sciences 0302 clinical medicine Glucocorticoid receptor Receptors Glucocorticoid Downregulation and upregulation In vivo Internal medicine medicine Animals Muscle Skeletal Molecular Biology Dose-Response Relationship Drug Myogenesis Skeletal muscle 030104 developmental biology medicine.anatomical_structure Endocrinology Gene Expression Regulation Oncorhynchus mykiss Rainbow trout hormones hormone substitutes and hormone antagonists 030217 neurology & neurosurgery Glucocorticoid Hormone medicine.drug |
| Zdroj: | Comparative biochemistry and physiology. Part B, Biochemistrymolecular biology. 253 |
| ISSN: | 1879-1107 |
| Popis: | Glucocorticoids are key stress-related hormones in vertebrates, with cortisol being the main glucocorticoid in teleosts. Glucocorticoids exert their effects through two mechanisms of action: genomic/classic and membrane initiated. In mammals, cortisol-mediated stress has been found to be associated with increased expression of critical atrophy-related genes (atrogenes), such as MAFbx/atrogin-1 and murf1/trim63. However, the direct impact of cortisol on the early regulation of atrogene expression in teleost skeletal muscle and the contribution of membrane-initiated cortisol action to this process have not been identified. In this work, the mRNA levels of atrogin-1 and murf1 were assessed in isolated myotubes and skeletal muscle of rainbow trout administered with cortisol or cortisol-BSA. This latter compound is a membrane-impermeable cortisol analog that exclusively induces membrane-initiated effects. We found that cortisol (10 mg/kg) first decreased the expression of both atrogenes at 3 h of treatment and then increased their expression at 9 h of treatment in the skeletal muscle of rainbow trout. Additionally, the in vitro analysis suggested that membrane-initiated cortisol action regulates murf1 but not atrogin-1 in rainbow trout myotubes. Using RU486 to selectively block glucocorticoid receptor (GR), we found that early downregulation of murf1 is potentially mediated by membrane GR signaling in myotubes. Considering the results of both the in vivo and in vitro approaches, we suggest that membrane-initiated cortisol action regulates the early expression of atrophy-related processes in teleosts. |
| Databáze: | OpenAIRE |
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