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Repeated sprint training in hypoxia potentiates muscle glycolytic adaptations through S100A protein signaling

ABSTRACT: Objective: Athletes increasingly engage in repeated sprint training that consists of repeated short all-out effort interspersed by short periods of recovery. When performed in hypoxia (RSH), it may lead to greater training effects than in normoxia (RSN), however the underlying molecular mechanisms remain unclear. This study aimed at elucidating the effects of RSH on skeletal muscle oxidative and glycolytic adaptations as compared to RSN. Methods: Healthy young men performed nine repeated sprint training sessions in three weeks. Each training session consisted in six series of six sprints in either normoxia (FiO2 = 20.9%, RSN, n = 7) or normobaric hypoxia (FiO2 = 13.6%, RSH, n = 9). Before and after the training period, exercise performance was assessed by using repeated sprint ability (RSA) and Wingate tests. Vastus lateralis muscle biopsies were performed to investigate muscle metabolic adaptations using proteomic combined to western blotting analyses. Results: We observed similar improvements in RSA and Wingate tests in both RSH and RSN groups. Proteomic analysis revealed a decrease in several proteins involved in oxidative phosphorylation (OXPHOS) in both groups and this was confirmed with western blot showing significant reductions in complexes I and V protein levels. RSN and RSH increased protein levels of the glycolytic enzyme hexokinase II, while only RSH induced a significant increase in the glucose transporter 4 (GLUT4) protein levels, suggesting superior glycolytic adaptations in response to hypoxia. This phenotype is further supported by proteomics data showing significant increase of proteins involved in glycolysis. Our proteomics data showed in the RSH group a specific increase in several S100A family proteins, among which S100A13 was the most modified, a result confirmed by western blot. S100A proteins have recently been shown to accelerate glycolytic phenotype of cancer cells by activating the protein kinase B (Akt) pathway. Our data corroborate these findings by showing in RSH group increased Akt phosphorylation as well as increased levels of proteins related to Akt downstream effects such as enhanced translation. Conclusions: Altogether our data indicate that RSH, as compared to RSN, potentiates the muscle glycolytic phenotype, possibly through the activation of S100A13 and the Akt pathway.

INSTRUMENT(S): timsTOF Pro

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Skeletal Muscle

SUBMITTER: Manfredo Quadroni

LAB HEAD: Nicolas Place

PROVIDER: PXD040779 | Pride | 2024-05-05

REPOSITORIES: Pride

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			Action	DRS
	1778_8-4-2021_Zanou_DIA_52-13485_4ul_RB1.d.zip	Other
	1779_8-4-2021_Zanou_DIA_53-13486_4ul_RB2.d.zip	Other
	1780_8-4-2021_Zanou_DIA_54-13487_4ul_RB3.d.zip	Other
	1782_8-4-2021_Zanou_DIA_37-13470_4ul_RB4.d.zip	Other
	1783_8-4-2021_Zanou_DIA_38-13471_4ul_RB5.d.zip	Other

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Repeated sprint training in hypoxia potentiates muscle glycolytic adaptations through S100A protein signaling

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