Somatostatin is a cyclic tetradecapeptide (14 amino acids) studied in laboratory research as a tool compound for the somatostatin receptor family (SSTR1–SSTR5), a group of G protein-coupled receptors, in vitro. A shorter 28-amino-acid form also exists. This article summarizes its structure and how researchers characterize it in controlled laboratory settings only.

Structure: Somatostatin’s ring is closed by a disulfide bond between its two cysteine residues, and that cyclic structure is essential to its receptor-binding profile — which makes disulfide integrity and analytical confirmation of identity 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, somatostatin is used to probe SSTR subtype signaling, including inhibition of adenylyl cyclase and cyclic AMP readouts, and comparative studies across receptor subtypes in controlled systems. Study designs typically include vehicle controls, subtype-selective reference compounds, 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 lot numbers 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: Somatostatin receptor family (SSTR) pharmacology reviews; standard HPLC/MS peptide characterization methods.