Bombesin
Also known as: BBS, amphibian bombesin, GRP analogue
Bombesin is a 14-amino-acid peptide initially isolated from the skin of frogs belonging to the genus Bombina. It serves as the amphibian equivalent of the mammalian gastrin-releasing peptide (GRP) and binds to the bombesin/GRP receptor family, which is found in the gut, brain, and certain cancer cells. This receptor distribution is why bombesin is studied in both gastrointestinal physiology and cancer research.
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Overview
Chemical compound
Bombesin is a 14-amino acid peptide originally isolated from the skin of the European fire-bellied toad by Vittorio Erspamer et al. and named after its source. It has two known homologs in mammals called neuromedin B and gastrin-releasing peptide. It stimulates gastrin release from G cells. It activates three different G-protein-coupled receptors known as BBR1, -2, and -3. It also activates these receptors in the brain. Together with cholecystokinin, it is the second major source of negative feedback signals that stop eating behaviour.
Mechanism of Action
Bombesin binds to G protein-coupled bombesin receptors, including the GRP receptor, on cell surfaces. In the gut, this interaction stimulates smooth muscle contraction and prompts the release of gastrointestinal hormones like gastrin, which a 2005 review associated with gastroprotective effects in animal models. In the brain, bombesin-responsive sites in the hypothalamus and brainstem link it to the regulation of gastric secretions and body temperature.
Research History
Bombesin was isolated in the early 1970s from the skin of European frogs of the genus Bombina. The discovery of its mammalian counterpart, gastrin-releasing peptide, and its presence in the gut and brain established bombesin as an essential tool for studying this receptor system. A 2000 review identified it as the first peptide shown to act in the brain to influence gastric function. In the 2000s and 2020s, research advanced toward leveraging its receptor affinity for imaging and targeted drug delivery in receptor-positive cancers.
What Researchers Are Saying
Community Reports - Not Medical Advice
The following is aggregated from public forums, Reddit, and research communities. These are anecdotal reports from researchers only - not verified clinical data and not a recommendation of any kind.
Bombesin (also known as BBS, amphibian bombesin) is studied within the peptide research community. Amphibian neuropeptide related to human GRP; studied as tumor-targeting vector for GRP receptor-positive cancers.
Last updated October 28, 2026
Research status: emerging. Bombesin appears across peptide research forums and academic literature. Researchers note this compound falls in the other category.
Last updated October 28, 2026
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