Motilin is a 22-amino-acid peptide studied in laboratory research as a tool compound for the motilin receptor (GPR38), a G protein-coupled receptor, in vitro. This article summarizes its structure and how researchers characterize it in controlled laboratory settings only.

Structure: Motilin is a linear peptide whose N-terminal region is important for receptor activation in laboratory assay systems, which makes sequence confirmation and analytical verification 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, motilin is used to probe motilin receptor signaling, including intracellular calcium and second-messenger readouts, and comparative studies 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 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: Motilin receptor (GPR38) pharmacology reviews; standard HPLC/MS peptide characterization methods.