A peptide that is found in the intrinsic nerves of the gastrointestinal tract, bombesin stimulates the release of gastrin and pancreatic enzymes and causes contraction of the gallbladder.

Where is bombesin secreted from?

Introduction. Bombesin is a peptide isolated from a European frog that exhibits many biological actions, including smooth muscle contraction and secretion of hormones and neuropeptides Battey and Wada (1991), Jensen and Coy (1991).

Where is bombesin located?

Bombesin is a peptide consisting of 27 amino acids found in normal brain, lung and gastrointestinal tract. High circulating levels are a feature of small-cell carcinoma of the lung (SCLC) and bronchial carcinoids [83], and have also been described in medullary carcinoma of the thyroid [84].