Hormone · Synthetic GnRH receptor agonist; azapeptide analogue
Goserelin
Also known as [D-Ser(tBu)6,AzGly10]-GnRH
An aza-glycine-containing GnRH analogue for examining receptor activation, peptide stability and adaptive pituitary signalling.
- Length
- 10 residues, including one aza-glycine residue
- Half-life
- Not well characterised
- Mechanism
- Goserelin activates GnRHR and stimulates Gq/11-linked phospholipase C signalling, generating inositol phosphates and intracellular calcium responses. Sustained stimulation can diminish gonadotroph responsiveness through receptor-associated and downstream adaptive processes.
- Studied in
- Recombinant receptor systems, pituitary cultures and animal endocrine models study goserelin's agonist activity, signalling dynamics and effects on gonadotroph regulation.
About Goserelin
Goserelin belongs to the synthetic GnRH analogue series developed after the structure of native hypothalamic GnRH became established. It preserves the ten-position framework of the parent peptide while incorporating O-tert-butyl-D-serine at position 6 and aza-glycine at position 10. In aza-glycine, the backbone alpha carbon is replaced by nitrogen. This unusual terminal modification distinguishes goserelin from conventional amino-acid-only analogues and contributes to its altered enzymatic stability.
The principal molecular target is the GnRH receptor, a G protein-coupled receptor expressed by pituitary gonadotrophs. Goserelin can be examined using ligand-binding assays, inositol phosphate accumulation, calcium imaging and measurements of gonadotroph gene expression. Longer experiments address adaptation to persistent receptor stimulation rather than simply initial agonist potency. Comparisons across receptor orthologues require care because receptor structure, expression level and cellular signalling machinery can all change measured responses.
Laboratory notes
- Ensure the identity assessment accounts for aza-glycine; sequence notation and mass calculations must represent the modified backbone correctly.
- Check solubility and solution stability in the intended assay buffer rather than extrapolating from native GnRH.
- Include receptor-negative controls and a reference agonist when interpreting calcium or reporter responses in recombinant cell systems.
Storage and reconstitution basics: storage guide.
Questions about Goserelin
Is goserelin a conventional decapeptide?
It has a ten-residue framework, but its terminal aza-glycine is an amino-acid analogue rather than a conventional alpha-amino acid. 'Decapeptide analogue' or 'azapeptide' makes this distinction clear.
How does goserelin differ structurally from buserelin?
Both contain O-tert-butyl-D-serine at position 6. Goserelin retains a tenth position as aza-glycinamide, whereas buserelin ends at proline-9 ethylamide.
Can a calcium assay establish binding affinity?
No. Calcium mobilisation measures a functional response influenced by receptor abundance and signal amplification. Binding affinity requires an appropriate binding experiment.
Is Goserelin for human use?
No. It is supplied strictly for in-vitro laboratory research and is not for human or animal consumption.
Related research peptides
All products are sold for laboratory research use only. Not for human consumption, not a medicine, not for diagnosing, treating or preventing any condition.