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, Thymosin Alpha-1 is clinically used in some countries as an immunomodulator for chronic hepatitis B/C and as an adjuvant in cancer therapy, enhancing cell-mediated immunity41487.
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, Thymosin Alpha-1 is a 28-amino-acid thymic peptide fragment of prothymosin alpha that activates dendritic cells and T cells primarily via TLR9/MyD88/NF-κB signaling, enhancing Th1 responses and NK-cell cytotoxicity414.
LL-37
CAMP
Thymosin Alpha-1
PTMA
Both peptides fall into a similar broad context as Immune-modulating peptides, although the details of how they are used and discussed still diverge. Both are often discussed in Immunology and inflammation contexts, while LL-37 is more of a antimicrobial peptide and Thymosin Alpha-1 is better described as a cytokine peptide. Both appear to work through Signaling modulator, but the functional emphasis still separates, with LL-37 leaning toward Anti-pathogenic and Tissue repair and healing and Thymosin Alpha-1 leaning toward Anti-inflammatory. Both come from biologically derived origins and their development context also differs, with LL-37 in Preclinical development while Thymosin Alpha-1 is approved. Thymosin Alpha-1 incorporates acetylation 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 Thymosin Alpha-1 showing protein-mimetic sequence features.
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