As judged by the PubMed outcomes, the cytoprotective effects of synthetic peptidyl GHRP appear far less studied in noncardiac, parenchymal epithelial organs or multiple organ systems than in the cardiovascular system. However, the results of the reviewed studies are consistent with a broad cytoprotective influence for various organs by reducing inflammation and preventing necrosis and/or apoptosis. The mechanism of GHRP-mediated pharmacological actions is shown in Figure 4.
Five public submissions were received. Many of the submissions referred to the article published in the New England Journal of Medicine (NEJM) when giving their reasons for either supporting or rejecting the proposal. Some submissions also noted that a similar proposal is to be considered by an upcoming meeting of the Medicines Classification Committee (MCC) in New Zealand.
Growth hormone-releasing peptide 6 (GHRP-6) (developmental code name SKF-110679), also known as growth hormone-releasing hexapeptide, is one of several synthetic met-enkephalin analogues that include unnatural D-amino acids, were developed for their growth hormone-releasing activity and are called growth hormone secretagogues. They lack opioid activity but are potent stimulators of growth hormone (GH) release. These secretagogues are distinct from growth hormone releasing hormone (GHRH) in that they share no sequence relation and derive their function through activation of a completely different receptor. This receptor was originally called the growth hormone secretagogue receptor (GHSR), but due to subsequent discoveries, the hormone ghrelin is now considered the receptor's natural endogenous ligand, and it has been renamed as the ghrelin receptor. Therefore, these GHSR agonists act as synthetic ghrelin mimetics.