ArticleMuscles (Basel, Switzerland)2026
Effect of Amino Acid Derivatives and Polyphenol Supplementation on Ovine Muscle Growth In Vitro and In Vivo.
Article in Muscles (Basel, Switzerland), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Nutrient supplementation may enhance muscle growth by supporting myogenic activity and regulating metabolic pathways involved in skeletal muscle development. However, the effect of specific nutrient supplementation on satellite cell (SC) activity and muscle-related metabolic pathways remains unclear. Two experiments were conducted to investigate dietary supplements, including guanidinoacetic acid (GAA), 5-hydroxytryptophan (5-HTP), and quercetin, on SC proliferation and differentiation in vitro and on muscle growth and transcriptomics in vivo. For the in vitro study, ovine SC were cultured with different levels (0, 12.5, 25, and 50 μmol/L) of 5-HTP, GAA, or quercetin to examine SC proliferation and differentiation. SC proliferation was greater with 5-HTP and quercetin supplementation, whereas GAA increased SC differentiation. Based on these results, 5-HTP and GAA were selected for the in vivo study because they increased proliferation and differentiation, respectively, and had a wider range of dose effectiveness (12.5 and 25 μmol/L). For the in vivo study, Texel lambs (n = 15; 33 ± 6 kg) were blocked by weight and assigned to one of three treatments: control, GAA, or 5-HTP for 28 d. Supplements were administered sublingually at a dose of 2.5 mg/kg body weight daily before feeding. GAA or 5-HTP did not influence (
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