First Protein and Peptide Map of South American Toad Rhaebo guttatus Skin Secretion | Research

The takeaway

First proteomic and peptidomic analysis of Rhaebo guttatus toad skin secretion reveals proteins and peptides with potential biological significance beyond known small molecules.

First-ever peptide map
The proteins and peptides in Rhaebo guttatus toad skin secretion had never been characterized before this study

What the researchers found

First proteomic and peptidomic characterization of R. guttatus skin secretion identified proteins and peptides with similarities to known toad venoms and potential biological activities.

Why it matters

Amphibian skin secretions are a rich source of bioactive molecules for drug discovery. Characterizing previously unstudied species expands the chemical library available for pharmaceutical development.

The numbers in context

Used nanoLC-ESI-q-ToF for shotgun proteomics and peptidomics. Identified proteins associated with muscle contraction, oxidative stress, and immunity (galectin, annexin).

How the study worked

Shotgun proteomics and peptidomics analysis using nano liquid chromatography coupled to high-resolution mass spectrometry (nanoLC-ESI-q-ToF).

Who was studied

Rhaebo guttatus (South American toad)

What this study cannot tell us

Descriptive study — identified proteins and peptides have not been tested for specific biological activities. Peptide functions are predicted based on homology, not experimental validation.

How to read the evidence

Descriptive analytical chemistry study. Provides a catalog of molecules but their biological activities remain to be experimentally validated.

When this study was published

Published in 2025, expanding the known amphibian venom peptidome.

The bigger picture

Amphibian biodiversity represents an enormous untapped resource for drug discovery. Each unstudied species may contain unique bioactive peptides with pharmaceutical potential.

Questions still open

Which identified peptides show the most promise for antimicrobial or anticancer activity?
How does the peptide arsenal of R. guttatus compare to other Bufonidae species in functional diversity?

Common questions

Why study toad skin secretions?

Amphibian skin contains a cocktail of defensive molecules that have been refined by millions of years of evolution. Many have antimicrobial, anticancer, or pain-modulating properties that could inspire new drugs.

What new molecules were found?

This study identified proteins and peptides in Rhaebo guttatus skin secretion for the first time, revealing a profile similar to other toad species and suggesting potential biological activities based on homology to known bioactive molecules.

Read the original research

Proteomic and peptidomic characterization of Rhaebo guttatus (Anura: Bufonidae) skin secretion.

Toxicon : official journal of the International Society on Toxinology, 259, 108359

View on PubMed ↗Publisher’s paper ↗

Citation

Pereira Dos Santos, Natalia Gabrielly; Mendes, Laís Campelo; Juliano, Maria Aparecida; Caldeira, Cleópatra Alves da Silva; Beraldo-Neto, Emídio; Pimenta, Daniel Carvalho. (2025). Proteomic and peptidomic characterization of Rhaebo guttatus (Anura: Bufonidae) skin secretion.. Toxicon : official journal of the International Society on Toxinology, 259, 108359. https://doi.org/10.1016/j.toxicon.2025.108359