Gastrin is a peptide studied in laboratory research in its G-17 and G-34 forms as a tool compound for the CCK-B/gastrin receptor, a G protein-coupled receptor, in vitro. This article summarizes its structure and how researchers characterize it in controlled laboratory settings only.

Structure: The gastrin forms share a conserved C-terminal sequence that is important for receptor binding in laboratory assay systems, and sulfated and unsulfated variants are distinguished analytically — which makes analytical confirmation of identity and form important in the laboratory. Researchers confirm identity and purity by HPLC and mass spectrometry and review the lot-matched Certificate of Analysis before use in experiments.

Laboratory applications: In cell culture and receptor-binding assays, gastrin is used to probe CCK-B/gastrin receptor signaling, including second-messenger readouts and comparative studies across the gastrin/CCK peptide family in controlled systems. Study designs typically include vehicle controls, a reference agonist, and analytical verification of the test article. No conclusions about human use can be drawn from in vitro work.

Analytical notes: Store lyophilized material as directed on the product label, protect from moisture, and document which gastrin form and lot number were used in laboratory records.

Disclaimer: This product and this article are for laboratory research purposes only. Not for human consumption. Not for medical, therapeutic, diagnostic, or veterinary use. No dosing, reconstitution-for-use, or efficacy information is provided or implied.

Citations: CCK-B/gastrin receptor pharmacology reviews; standard HPLC/MS peptide characterization methods.