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Together, these mechanisms provide multi-faceted control over energy intake and glucose metabolism

10.1038/labinvest.2016.35 190 VanlandewijckM.HeL.MeM

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Where They Diverge Despite sharing the same receptor, GHRP-2 and GHRP-6 differ in their downstream signaling emphasis , particularly in hypothalamic circuits: GHRP-6 more potently engages NPY/AgRP orexigenic neurons in the arcuate nucleus, producing significantly stronger appetite stimulation GHRP-2 appears to engage these appetite circuits less intensely while maintaining comparable somatotroph-level GH release The structural difference GHRP-2's D-Nal at position 2 vs GHRP-6's D-Trp likely influences binding kinetics and the balance of signaling outputs at GHSR-1a