In the medication off state (12 h after medication withdrawal), five rsfMRI runs (6 min each, totalling 30 min) were acquired with a gradient-echo EPI sequence (TR = 3,000 ms, TE = 30 ms, flip angle = 90, voxel size = 3 3 3 mm 3 , 47 axial slices)
When Ipamorelin binds to GHS-R1a, it triggers an intracellular signaling cascade: Receptor activation Ipamorelin binds the GHS-R1a receptor on pituitary somatotrophs Phospholipase C pathway Gq/11 protein coupling activates PLC, generating IP3 and DAG Calcium mobilization IP3-mediated calcium release from intracellular stores triggers GH vesicle exocytosis Pulsatile GH release Growth hormone is released in a physiological pulsatile pattern, preserving hypothalamic feedback A critical distinction in Ipamorelin's mechanism is that it preserves the hypothalamic-pituitary feedback axis
Discovery Medicine
Shan B, Cai YZ, Sun M, Corke H
Peng, S
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