Ghrelin is a 28-amino-acid peptide studied in laboratory research as a reference ligand for the growth hormone secretagogue receptor (GHSR), a G protein-coupled receptor, in vitro. Laboratory work uses defined synthetic material, including its acylated and des-acyl forms, so that receptor experiments are reproducible from lot to lot.

Structure: ghrelin carries a distinctive octanoyl modification on its third serine residue, and that acylation is a key structural variable in laboratory studies because acylated and des-acyl ghrelin behave differently in GHSR binding assays. Identity, acylation state, and purity of research material are confirmed by HPLC and mass spectrometry, and the lot-matched certificate of analysis is reviewed before use.

Laboratory applications: cell culture and receptor-binding assays probing GHSR signaling, structure-activity studies comparing acylated ghrelin, des-acyl ghrelin, and truncated fragments, and stability studies tracking de-acylation under controlled laboratory conditions. Vehicle controls, analytical verification, and replication are standard. In vitro findings describe receptor behavior in laboratory systems only; no conclusions about human use can be drawn from them.

Analytical notes: store lyophilized material sealed, protected from light and moisture; verify identity and purity by HPLC/MS on receipt; avoid repeated freeze-thaw cycles; record lot numbers in laboratory documentation.

Disclaimer: This material is supplied 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: standard ghrelin and GHSR literature; GPCR pharmacology reviews; standard HPLC/MS peptide characterization methods.