Caracterisation of signaling pathways controled by androgens in mouse striated muscle
Identifieur interne : 000022 ( Hal/Curation ); précédent : 000021; suivant : 000023Caracterisation of signaling pathways controled by androgens in mouse striated muscle
Auteurs : Me Lanie Schuh [France]Source :
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- topic : Glucose.
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Abstract
Muscles generate strength and movement, and have important metabolic functions. The aim of my work was to characterize the role and mechanisms of action of androgen receptor in skeletal muscle. We show that ablation of the androgen receptor in skeletal muscle myofibers does not affect muscle mass as both anabolic (IGF1) and catabolic pathways (myostatin) are deregulated. However, the absence of this receptor in myofibers decreases muscle hypertrophy induced by mechanical overload and limits glucocorticoids-induced muscle atrophy. Its ablation also increases autophagy, leading to sacromeres destructuration, resulting in decreased muscle strength. Moreover, its deletion reduced the rate of glucose absorption during a glucidic overload. Thus, myofibres androgen receptor regulates muscle mass and strength, as well as glucose import.
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<front><div type="abstract" xml:lang="en">Muscles generate strength and movement, and have important metabolic functions. The aim of my work was to characterize the role and mechanisms of action of androgen receptor in skeletal muscle. We show that ablation of the androgen receptor in skeletal muscle myofibers does not affect muscle mass as both anabolic (IGF1) and catabolic pathways (myostatin) are deregulated. However, the absence of this receptor in myofibers decreases muscle hypertrophy induced by mechanical overload and limits glucocorticoids-induced muscle atrophy. Its ablation also increases autophagy, leading to sacromeres destructuration, resulting in decreased muscle strength. Moreover, its deletion reduced the rate of glucose absorption during a glucidic overload. Thus, myofibres androgen receptor regulates muscle mass and strength, as well as glucose import.</div>
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<abstract xml:lang="en">Muscles generate strength and movement, and have important metabolic functions. The aim of my work was to characterize the role and mechanisms of action of androgen receptor in skeletal muscle. We show that ablation of the androgen receptor in skeletal muscle myofibers does not affect muscle mass as both anabolic (IGF1) and catabolic pathways (myostatin) are deregulated. However, the absence of this receptor in myofibers decreases muscle hypertrophy induced by mechanical overload and limits glucocorticoids-induced muscle atrophy. Its ablation also increases autophagy, leading to sacromeres destructuration, resulting in decreased muscle strength. Moreover, its deletion reduced the rate of glucose absorption during a glucidic overload. Thus, myofibres androgen receptor regulates muscle mass and strength, as well as glucose import.</abstract>
<abstract xml:lang="fr">Les muscles permettent de générer force et mouvements et ont des fonctions métaboliques importantes. Mon travail a consisté à caractériser le rôle et les mécanismes d’actions des androgènes dans le muscle strié. Nous avons montré que l’ablation du récepteur des androgènes dans les myofibres n’affecte pas la masse musculaire car à la fois les voies anaboliques (IGF1) et cataboliques (myostatine) sont dérégulées. Cependant, l’absence du récepteur dans les myofibres diminue l’hypertrophie musculaire induite par une surcharge mécanique et limite l’atrophie induite par les glucocorticoïdes. Son ablation augmente également l’autophagie, entrainant une déstructuration des sarcomères, conduisant à une diminution de la force musculaire. De plus, sa délétion diminue la vitesse d’absorption du glucose lors d’une surcharge glucidique. Le récepteur des androgènes dans les myofibres régule donc la masse et la force musculaire, ainsi que l’import du glucose.</abstract>
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