Acetyl tetrapeptide-5
is used in cosmetic eye formulations to decrease puffiness, eye bags, and dark circles by reducing edema and protecting proteins such as SOD from glycation
Alanine
Ala / A · hydrophobic residue · neutral charge
AOD-9604
is studied as an anti-obesity peptide that can reduce weight gain and increase fat oxidation in obese animal models with generally neutral effects on IGF-1 and glucose metabolism in early human trials
Arginine
Arg / R · basic residue · positive charge
Argireline
is a topical cosmetic peptide reported to decrease dynamic wrinkles by partially mimicking the mechanism of botulinum toxin in a non-invasive manner
Asparagine
Asn / N · polar residue · neutral charge
Aspartic acid
Asp / D · acidic residue · negative charge
BPC-157
is investigated for accelerating healing of gastrointestinal mucosa, tendons, ligaments, bone, and nervous tissue in preclinical models, with anti-inflammatory and pro-angiogenic effects
Comparison
While LL-37 acts as a broad-spectrum antimicrobial and immunomodulatory peptide involved in host defense and wound repair, but can also promote inflammation and cancer cell proliferation in some contexts5215, Setmelanotide is approved for chronic weight management in patients with POMC, PCSK1, LEPR deficiencies and Bardet–Biedl syndrome by reducing hunger and promoting weight loss92.
While LL-37 works as a cationic amphipathic 37-amino-acid cathelicidin peptide generated from hCAP18 that disrupts microbial membranes and modulates innate immunity, including chemotaxis, cytokine induction, and NET formation521586, Setmelanotide is a potent synthetic melanocortin-4 receptor (MC4R) agonist derived from a POMC/α-MSH–related sequence that restores downstream MC4R signaling in genetic obesity syndromes3192100.
LL-37
CAMP
Setmelanotide
POMC
LL-37 and Setmelanotide are noticeably different, with limited direct overlap in their usual biological context. Their typical research and application settings separate fairly clearly: LL-37 is more often discussed in the realm of Immunology and inflammation and Gastroenterology, whereas Setmelanotide is more often associated with the realm of Metabolic and endocrine. They also influence different molecular systems, with LL-37 tracking more closely to GPCR receptor while Setmelanotide centers more on Melanocortin receptor. LL-37 has a more natural endogenous origin, while Setmelanotide is closer to synthetic design background and their development context also differs, with LL-37 in Preclinical development while Setmelanotide is approved. LL-37 takes the form of a linear peptide, whereas Setmelanotide is closer to a cyclic peptide, Setmelanotide incorporates d-amino acid substitution features that are not part of LL-37; while their sequence patterns also diverge, with LL-37 showing cationic amphipathic and alpha-helical domain features and Setmelanotide showing protein-mimetic sequence features.
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