Reduced Skeletal Muscle Protein Turnover and Thyroid Hormone Metabolism in Adaptive Thermogenesis That Facilitates Body Fat Recovery During Weight Regain
Autor: | Julie Calonne, Laurie Isacco, Jennifer Miles-Chan, Denis Arsenijevic, Jean-Pierre Montani, Christelle Guillet, Yves Boirie, Abdul G. Dulloo |
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Přispěvatelé: | department of Endocrinology, Metabolism and Cardiovascular Systems, Faculty of Science and Medicine, Université de Fribourg, service de nutrition clinique, Centre Hospitalier Universitaire de Clermont-Ferrand, EA 3920, EPSI, Université Bourgogne Franche-Comté [COMUE] (UBFC), Unité de Nutrition Humaine - Clermont Auvergne (UNH), Institut National de la Recherche Agronomique (INRA)-Université Clermont Auvergne (UCA), Swiss National Science Foundation 310030_152870, CHU Clermont-Ferrand, Marqueurs pronostiques et facteurs de régulations des pathologies cardiaques et vasculaires - UFC ( EA 3920) (PCVP / CARDIO), Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre Hospitalier Régional Universitaire de Besançon (CHRU Besançon), Unité de Nutrition Humaine (UNH), Institut National de la Recherche Agronomique (INRA)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020]), Dulloo, A. G., Université de Fribourg = University of Fribourg (UNIFR), Marqueurs pronostiques et facteurs de régulations des pathologies cardiaques et vasculaires - UFC ( UR 3920) (PCVP / CARDIO), Centre Hospitalier Régional Universitaire de Besançon (CHRU Besançon)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC) |
Jazyk: | angličtina |
Rok vydání: | 2019 |
Předmět: |
0301 basic medicine
deiodinase medicine.medical_specialty obesity Endocrinology Diabetes and Metabolism Deiodinase 030209 endocrinology & metabolism thermogenesis catch-up growth thrifty metabolism caloric restriction Protein degradation lcsh:Diseases of the endocrine glands. Clinical endocrinology 03 medical and health sciences 0302 clinical medicine Endocrinology Weight loss Internal medicine medicine Original Research Endocrinology and metabolism lcsh:RC648-665 biology Chemistry Thyroid Protein turnover Skeletal muscle [SDV.MHEP.EM]Life Sciences [q-bio]/Human health and pathology/Endocrinology and metabolism 030104 developmental biology medicine.anatomical_structure biology.protein Endocrinologie et métabolisme medicine.symptom Thermogenesis Hormone |
Zdroj: | Frontiers in Endocrinology Frontiers in Endocrinology, Frontiers, 2019, 10, ⟨10.3389/fendo.2019.00119⟩ Frontiers in Endocrinology (10), . (2019) Frontiers in Endocrinology, 2019, 10, ⟨10.3389/fendo.2019.00119⟩ Frontiers in Endocrinology, Vol 10 (2019) |
ISSN: | 1664-2392 |
DOI: | 10.3389/fendo.2019.00119⟩ |
Popis: | Objective: The recovery of body composition after weight loss is characterized by an accelerated rate of fat recovery (preferential catch-up fat) resulting partly from an adaptive suppression of thermogenesis. Although the skeletal muscle has been implicated as an effector site for such thrifty (energy conservation) metabolism driving catch-up fat, the underlying mechanisms remain to be elucidated. We test here the hypothesis that this thrifty metabolism driving catch-up fat could reside in a reduced rate of protein turnover (an energetically costly “futile” cycle) and in altered local thyroid hormone metabolism in skeletal muscle.Methods: Using a validated rat model of semistarvation-refeeding in which catch-up fat is driven solely by suppressed thermogenesis, we measured after 1 week of refeeding in refed and control animals the following: (i) in-vivo rates of protein synthesis in hindlimb skeletal muscles using the flooding dose technique of 13C-labeled valine incorporation in muscle protein, (ii) ex-vivo muscle assay of net formation of thyroid hormone tri-iodothyronine (T3) from precursor hormone thyroxine (T4), and (iii) protein expression of skeletal muscle deiodinases (type 1, 2, and 3).Results: We show that after 1 week of calorie-controlled refeeding, the fractional protein synthesis rate was lower in skeletal muscles of refed animals than in controls (by 30–35%, p < 0.01) despite no between-group differences in the rate of skeletal muscle growth or whole-body protein deposition—thereby underscoring concomitant reductions in both protein synthesis and protein degradation rates in skeletal muscles of refed animals compared to controls. These differences in skeletal muscle protein turnover during catch-up fat were found to be independent of muscle type and fiber composition, and were associated with a slower net formation of muscle T3 from precursor hormone T4, together with increases in muscle protein expression of deiodinases which convert T4 and T3 to inactive forms.Conclusions: These results suggest that diminished skeletal muscle protein turnover, together with altered local muscle metabolism of thyroid hormones leading to diminished intracellular T3 availability, are features of the thrifty metabolism that drives the rapid restoration of the fat reserves during weight regain after caloric restriction. |
Databáze: | OpenAIRE |
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