201. FoxO-dependent atrogenes vary among catabolic conditions and play a key role in muscle atrophy induced by hindlimb suspension
- Author
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Maria Antonietta Pellegrino, Marco Sandri, Lorenza Brocca, Carlo Reggiani, Luana Toniolo, and Roberto Bottinelli
- Subjects
0301 basic medicine ,Denervation ,medicine.medical_specialty ,Physiology ,Wild type ,FOXO1 ,Hindlimb Suspension ,Biology ,medicine.disease ,Muscle atrophy ,03 medical and health sciences ,Protein catabolism ,030104 developmental biology ,Endocrinology ,Atrophy ,Ageing ,Internal medicine ,medicine ,medicine.symptom - Abstract
Muscle atrophy is a complex process that is in common with many different catabolic diseases including disuse/inactivity and ageing. The signalling pathways that control the atrophy program in the different disuse/inactivity conditions have not yet been completely dissected. It has been recently reported that inhibition of FoxO only partially spared muscle mass after denervation. The purposes of this study were: (i) to determine the involvement of FoxOs in hindlimb suspension disuse model, (ii) to define whether the molecular events of protein breakdown are shared among different unloaded muscles and finally (iii) to compare the data obtained in this model with another model of inactivity such as denervation. Both wild type and muscle-specific FoxO1,3,4 knockout (FoxO1,3,4−/−) mice were unloaded for 3 and 14 days and muscles were characterized by functional, morphological, biochemical and molecular assays. Our data show that FoxOs are required for muscle loss and force drop during unloading. Moreover, we found that FoxO-dependent atrogenes vary in different unloaded muscles and that they diverge from denervation. Our findings clearly indicate that the signalling network that controls the atrophy program is specific for each catabolic condition. This article is protected by copyright. All rights reserved
- Published
- 2016