Background: There is increasing evidence that unacylated ghrelin (UAG) improves insulin sensitivity and glucose homeostasis; however, the mechanism for this activity is not fully understood since a UAG receptor has not been discovered. Methodology/Principal Findings: To assess potential mechanisms of UAG action in vivo, we examined rapid effects of UAG on genome-wide expression patterns in fat, muscle and liver of growth hormone secretagogue receptor (GHSR)-ablated mice using microarrays. Expression data were analyzed using Ingenuity Pathways Analysis and Gene Set Enrichment Analysis. Regulation of subsets of these genes was verified by quantitative PCR in an independent experiment. UAG acutely regulated clusters of genes involved in glucose and lipid metabolism in all three tissues, consistent with enhancement of insulin sensitivity. Conclusions/Significance: Fat, muscle and liver are central to the control of lipid and glucose homeostasis. UAG rapidly modulates the expression of metabolically important genes in these tissues in GHSR-deleted mice indicating a direct, GHSRindependent, action of UAG to improve insulin sensitivity and metabolic profile.

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Keywords animal cell, animal tissue, article, cell function, controlled study, gene cluster, gene expression, genetic analysis, ghrelin receptor, glucose, glucose metabolism, growth hormone secretagogue receptor, insulin sensitivity, lipid metabolism, liver, mouse, muscle tissue, nonhuman, polymerase chain reaction, protein function, protein microarray, quantitative analysis, signal transduction, white adipose tissue
Persistent URL dx.doi.org/10.1371/journal.pone.0011749, hdl.handle.net/1765/20942
Journal PLoS ONE
Citation
Delhanty, P.J.D, Sun, Y, Visser, J.A, Kerkwijk, A, Huisman, M, van IJcken, W.F.J, & Swagemakers, S.M.A. (2010). Unacylated ghrelin rapidly modulates lipogenic and insulin signaling pathway gene expression in metabolically active tissues of GHSR deleted mice. PLoS ONE, 5(7). doi:10.1371/journal.pone.0011749