Data/hora: 04/06/2024 02:43:29

Provedor de dados: | 56
País: | Brazil
Título: | Pros and cons of insulin administration on liver glucose metabolism in strength-trained healthy mice
Autores: | Pereira,V.A.R.; Vedovelli,K.S.; Muller,G.Y.; Depieri,Y.F.; Avelar,D.H.C.G.; de Amo,A.H.E.; Jimenes,D.R.; Martins,J.N.L.; Silvério,A.C.; Gomes,C.R.G.; Godoi,V.A.F.; Pedrosa,M.M.D.
Data: | 2019-01-01
Ano: | 2019
Palavras-chave: | Muscle strength; Gluconeogenesis; Liver; Adiposity; Training.
Resumo: | Non-diabetic individuals use hormones like insulin to improve muscle strength and performance. However, as insulin also leads the liver and the adipose tissue to an anabolic state, the purpose of this study was to investigate the effects of insulin on liver metabolism in trained non-diabetic Swiss mice. The mice were divided into four groups: sedentary treated with saline (SS) or insulin (SI) and trained treated with saline (TS) or insulin (TI). Training was made in a vertical stair, at 90% of the maximum load, three times per week. Insulin (0.3 U/kg body weight) or saline were given intraperitoneally five times per week. After eight weeks, tissue and blood were collected and in situ liver perfusion with glycerol+lactate or alanine+glutamine (4 mM each) was carried out. The trained animals increased their muscle strength (+100%) and decreased body weight gain (–11%), subcutaneous fat (–42%), mesenteric fat (–45%), and peritoneal adipocyte size (–33%) compared with the sedentary groups. Insulin prevented the adipose effects of training (TI). The gastrocnemius muscle had greater density of muscle fibers (+60%) and less connective tissue in the trained groups. Liver glycogen was increased by insulin (SI +40% and TI +117%), as well as liver basal glucose release (TI +40%). Lactate and pyruvate release were reduced to a half by training. The greater gluconeogenesis from alanine+glutamine induced by training (TS +50%) was reversed by insulin (TI). Insulin administration had no additional effect on muscle strength and reversed some of the lipolytic and gluconeogenic effects of the resistance training. Therefore, insulin administration does not complement training in improving liver glucose metabolism.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2019000200605
Editor: | Associação Brasileira de Divulgação Científica
Relação: | 10.1590/1414-431x20187637
Formato: | text/html
Fonte: | Brazilian Journal of Medical and Biological Research  v.52 n.2 2019
Fonte: | info:eu-repo/semantics/openAccess