Suppression of the murine osteoblasts MC3T3-E1 proliferation by dexamethasone (Dex) was associated with G1 phase delay and apoptosis induction accompanied by p53-dependent activation of p21 and the up-regulation of proapoptotic genes NOXA and PUMA [24]
Mechanism Comparison Shared Pathway Both peptides activate GHSR-1a on pituitary somatotrophs, triggering: GHSR-1a Gq/11 PLC IP + DAG intracellular Ca release PKC activation Ca influx GH vesicle exocytosis This is fundamentally different from how GHRH analogs (CJC-1295, Sermorelin) work (GHRHR Gs cAMP PKA), which is why combining either GHRP with a GHRH analog produces synergistic GH release (Veldhuis et al., 2009)
doi: 10.1046/j.1365-3083.2002.01063.x 142 GehDGordonC
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