The octanoylated peptide hormone ghrelin regulates episodic growth hormone release and energy balance. Work in genetically modified mice (Kirchner et al., 2009) now shows that in vivo activity of ghrelin O-acyltransferase (GOAT), responsible for ghrelin octanoylation, decreases during fasting but increases after ingesting medium-chain fatty acid triglycerides (MCT).
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