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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Novel hexarelin analogs stimulate feeding in the rat through a mechanism not involving growth hormone release.

Growth hormone-releasing peptides (GHRPs) are a class of small peptides that stimulate growth hormone ( GH) release in several animal species, including the human. Moreover, GHRPs injected into the brain ventricles stimulate feeding in the rat. The aim of this study was to evaluate the GH- releasing properties of a series of novel GHRP analogs and the possible existence of functional correlations between the GH-releasing activity and the effects on feeding behavior. Two well-known hexapeptides, GHRP-6 and hexarelin, given s.c., dose dependently stimulated both GH release and feeding behavior in satiated rats. However, in a series of tri-, penta- and hexapeptide analogs of hexarelin, some compounds were active either on GH release or on eating behavior. Interestingly, even minor structural modifications resulted in major changes of the pharmacological profile. We conclude that GHRPs have orexigenic properties after systemic administration which are largely independent from the effects they exert on GH release.[1]

References

  1. Novel hexarelin analogs stimulate feeding in the rat through a mechanism not involving growth hormone release. Torsello, A., Luoni, M., Schweiger, F., Grilli, R., Guidi, M., Bresciani, E., Deghenghi, R., Müller, E.E., Locatelli, V. Eur. J. Pharmacol. (1998) [Pubmed]
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