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María D Girón, José D Vílchez, Rafael Salto, Manuel Manzano, Natalia Sevillano, Nefertiti Campos, Josep M Argilés, Ricardo Rueda, José M López-Pedrosa
BACKGROUND: L-Leu and its metabolite β-hydroxy-β-methylbutyrate (HMB) stimulate muscle protein synthesis enhancing the phosphorylation of proteins that regulate anabolic signalling pathways. Alterations in these pathways are observed in many catabolic diseases, and HMB and L-Leu have proven their anabolic effects in in vivo and in vitro models. The aim of this study was to compare the anabolic effects of L-Leu and HMB in myotubes grown in the absence of any catabolic stimuli. METHODS: Studies were conducted in vitro using rat L6 myotubes under normal growth conditions (non-involving L-Leu-deprived conditions)...
March 2016: Journal of Cachexia, Sarcopenia and Muscle
Michelle Kao, Daniel A Columbus, Agus Suryawan, Julia Steinhoff-Wagner, Adriana Hernandez-Garcia, Hanh V Nguyen, Marta L Fiorotto, Teresa A Davis
Many low-birth weight infants are at risk for poor growth due to an inability to achieve adequate protein intake. Administration of the amino acid leucine stimulates protein synthesis in skeletal muscle of neonates. To determine the effects of enteral supplementation of the leucine metabolite β-hydroxy-β-methylbutyrate (HMB) on protein synthesis and the regulation of translation initiation and degradation pathways, overnight-fasted neonatal pigs were studied immediately (F) or fed one of five diets for 24 h: low-protein (LP), high-protein (HP), or LP diet supplemented with 4 (HMB4), 40 (HMB40), or 80 (HMB80) μmol HMB·kg body wt(-1)·day(-1) Cell replication was assessed from nuclear incorporation of BrdU in the longissimus dorsi (LD) muscle and jejunum crypt cells...
June 1, 2016: American Journal of Physiology. Endocrinology and Metabolism
Linda Berton, Giulia Bano, Sara Carraro, Nicola Veronese, Simona Pizzato, Francesco Bolzetta, Marina De Rui, Elena Valmorbida, Irene De Ronch, Egle Perissinotto, Alessandra Coin, Enzo Manzato, Giuseppe Sergi
UNLABELLED: Although older people are particularly liable to sarcopenia, limited research is available on beta-hydroxy-beta-methylbutyrate (HMB) supplementation in this population, particularly in healthy subjects. In this parallel-group, randomized, controlled, open-label trial, we aimed to evaluate whether an oral supplement containing 1.5 g of calcium HMB for 8 weeks could improve physical performance and muscle strength parameters in a group of community-dwelling healthy older women...
2015: PloS One
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