Insulin increases net muscle protein by increasing amino acid transport into the muscle cell, by increasing protein synthesis and by reducing protein breakdown. (bodybuilding-wizard.com)
The hormone reversed the abnormally high fetal blood sugar levels observed in the fetuses of obese mice, and it seemed to limit fetal nutrition by reducing levels of certain glucose and amino acid transport proteins at the placental barrier. (sciencemag.org)
In the brain, these transporters are involved in the neuronal amino acid transport. (sciencedaily.com)