Comparison

GHRP-6 vs SS-31

Function

While GHRP-6 is used experimentally to produce strong GH surges and hyperphagia, allowing investigation of GH-dependent anabolism and energy-balance regulation2030, SS-31 improves mitochondrial bioenergetics, reduces oxidative stress, and shows protective effects in models of ischemia-reperfusion, neurodegeneration, and other mitochondrial disorders4637137.

Mechanism

While GHRP-6 works as a first-generation synthetic hexapeptide ghrelin mimetic that potently stimulates GH release and markedly increases appetite via GHSR-1a activation in hypothalamus and pituitary203096, SS-31 is a mitochondria-targeted tetrapeptide, d-Arg-dimethylTyr-Lys-Phe-NH2, that selectively binds cardiolipin in the inner mitochondrial membrane, stabilizing cristae structure, improving electron transport, and reducing ROS production4637137143.

Length and Sequence

GHRP-6 is 6 amino acids long, whereas SS-31 is shorter as it has a length of 4 amino acids. GHRP-6 is made up of a sequence of Histidine, Tryptophan, Alanine, Tryptophan, Phenylalanine, Lysine. SS-31 is made up of a sequence of Arginine, dimethylTyr, Lysine, Phenylalanine.

Receptor

GHRP-6

Ghrelin/growth hormone secretagogue receptor (GHSR-1a) 203096104

SS-31

Cardiolipin-rich inner mitochondrial membrane; interacts with cardiolipin and associated mitochondrial proteins rather than a classical cell-surface receptor46137143

Organism or Origin

GHRP-6

Synthetic peptide analog of met-enkephalin30

SS-31

Fully synthetic Szeto–Schiller tetrapeptide; not encoded in the genome4637

Gene

GHRP-6

GHSR

SS-31

Not assigned in the current dataset.

Related articles

No related articles are linked to these peptides yet.

Sources

20GHRP-6: The Original GHRP Research Overview - Peptidings, https://peptidings.com/peptides/ghrp-6/
30GHRP-6 - Wikipedia, https://en.wikipedia.org/wiki/GHRP-6
96Growth Hormone Secretagogue Receptor - ScienceDirect.com, https://www.sciencedirect.com/topics/biochemistry-genetics-and-molecular-biology/growth-hormone-secretagogue-receptor
46Discovery of novel SS-31 (d-Arg-dimethylTyr-Lys-Phe-NH2 ... - PMC, https://pmc.ncbi.nlm.nih.gov/articles/PMC11409442/
56Discovery of novel SS-31 (d-Arg-dimethylTyr-Lys-Phe-NH2 ..., https://pubs.rsc.org/en/content/articlelanding/2024/ra/d4ra05517a
137Mitochondrial protein interaction landscape of SS-31 | PNAS, https://www.pnas.org/doi/10.1073/pnas.2002250117
143SS-31 Peptide: Mitochondrial Repair for Energy and Longevity, https://revolutionhealth.org/blogs/news/peptide-therapy-ss-31