27 Wound-Healing Peptides Discovered in Frogs and Salamanders Could Lead to New Treatments | Research

The takeaway

Researchers have cataloged 27 wound-healing peptides from amphibians — 25 from frogs and 2 from salamanders — that accelerate skin repair through multiple mechanisms including cell growth, immune recruitment, and antibacterial action.

27 wound-healing peptides
Twenty-seven distinct peptides with wound-healing properties have been characterized from amphibians, with six showing dual antimicrobial and wound-healing activity — meaning they can fight infection while simultaneously accelerating repair.

What the researchers found

The review identified 27 amphibian-derived peptides with wound-healing properties: 25 from frogs and 2 from salamanders (tylotoin and TK-CATH). These peptides range from 5-80 amino acid residues in length and have various structural features:

- 9 peptides have intramolecular disulfide bonds (including tiger17, cathelicidin-NV, cathelicidin-DM, RL-QN15)

- 7 peptides are amidated at the C-terminus (including temporin A, temporin B, esculentin-1a)

- The remainder are linear peptides without modifications

All peptides efficiently accelerated wound healing or photodamage repair in animal models. Their mechanisms include promoting keratinocyte and fibroblast proliferation and migration, recruiting neutrophils and macrophages to wounds, and regulating immune responses. Notably, 6 peptides (MSI-1, Pse-T2, cathelicidin-DM, brevinin-2Ta, brevinin-2PN, DMS-PS2) were antimicrobial peptides that also promoted healing of infected wounds by clearing bacteria.

Why it matters

Chronic wounds and wound infections remain a significant healthcare burden, particularly for diabetic and elderly patients. Current wound-healing therapies have limitations, and antibiotic resistance makes infected wounds increasingly difficult to treat. Amphibian-derived peptides offer a dual advantage: they can both accelerate healing and fight infection simultaneously. Their small size makes them relatively easy and cheap to produce synthetically, which could translate to affordable wound-care products.

How the study worked

This is a comprehensive review article that systematically cataloged all characterized amphibian-derived wound-healing peptides from published literature. The authors summarized each peptide's structural features, source species, wound-healing efficacy in animal models, and mechanisms of action.

What this study cannot tell us

All wound-healing evidence comes from mouse and rat models — no human clinical data exist for any of these peptides. Translation from rodent skin healing to human skin healing faces significant biological differences. The review does not address potential toxicity, allergenicity, or stability challenges that would need to be resolved for clinical use. Long-term effects and optimal delivery methods have not been established.

How to read the evidence

This is a review of preclinical studies, all conducted in mouse or rat models. While the body of evidence across 27 peptides is substantial, none have been tested in human clinical trials. The evidence grade reflects promising but early-stage research.

When this study was published

Published in 2023, this review provides a current and comprehensive catalog of amphibian-derived wound-healing peptides, capturing the state of the field as peptide therapeutics continue to gain research interest.

The bigger picture

Amphibians have been a treasure trove for bioactive peptide discovery, from antimicrobial peptides to pain-modulating compounds. This review shows they are also a rich source of wound-healing agents. As the field of peptide therapeutics matures, these natural peptides serve as templates for designing synthetic wound-healing drugs. The dual antimicrobial/healing function of several peptides is particularly attractive in an era of growing antibiotic resistance.

Questions still open

Which of these 27 amphibian peptides are most likely to succeed in human wound-healing clinical trials?
Can synthetic analogs of these peptides be designed to improve stability and reduce potential immunogenicity for human use?
Would these peptides be effective for chronic wounds like diabetic ulcers, which are far more complex than the acute wound models tested?

Common questions

Why are frogs and salamanders good sources of wound-healing peptides?

Amphibians produce a wide array of bioactive peptides in their skin as part of their natural defense system. These peptides have evolved to protect against infection and promote tissue repair — functions that are directly relevant to wound healing. Their small size (5-80 amino acids) makes them relatively easy and inexpensive to produce synthetically, which is a practical advantage over larger protein-based drugs.

Can any of these amphibian peptides be used to treat wounds in humans today?

Not yet. All 27 peptides described in this review have only been tested in mice and rats. While they show impressive wound-healing results in animal models, they would need to go through extensive safety testing and human clinical trials before becoming available as treatments. However, their small size, low production cost, and well-defined mechanisms of action make them strong candidates for future drug development.

Read the original research

Characterization and mechanism of action of amphibian-derived wound-healing-promoting peptides.

Frontiers in cell and developmental biology, 11, 1219427

View on PubMed ↗Publisher’s paper ↗

Citation

Wang, Xiakun; Duan, Hongcheng; Li, Min; Xu, Wei; Wei, Lin. (2023). Characterization and mechanism of action of amphibian-derived wound-healing-promoting peptides.. Frontiers in cell and developmental biology, 11, 1219427. https://doi.org/10.3389/fcell.2023.1219427