Researchers have discovered a number of new antibiotic substances in the skin of Russian Brown frog, which had been used in ancient Russia to keep milk from going sour, according to a new study published in the Journal of Proteome Research.
A. T. Lebedev and colleagues explain that amphibians secrete antimicrobial substances called peptides through their skin. These compounds make up the majority of their skin secretions and act as a first line of defense against bacteria and other microorganisms that thrive in the wet places frogs, toads, salamanders and other amphibians live. A previous study identified on the skin of the Russian Brown frog 21 substances with antibiotic and other potential medical activity. Lebedev's team set out to find more of these potential medical treasures.
They used a sensitive laboratory technique to expand the list of such substances on the frogs' skin, identifying 76 additional substances of this kind. They describe lab tests in which some of the substances performed as well against Salmonella
bacteria as some prescription antibiotic medicines. "These peptides could be potentially useful for the prevention of both pathogenic and antibiotic resistant bacterial strains while their action may also explain the traditional experience of rural populations," the scientists concluded.