Research Spotlight

Ipamorelin: Research Overview

PūrTONIX Analytical TeamFebruary 18, 20253 min read

Research Use Only — Regulatory Notice

All information contained in this article is derived exclusively from publicly available scientific literature, peer-reviewed academic publications, and publicly accessible research databases. This content is provided strictly for educational and informational purposes in the context of laboratory research.

PūrTONIX does not make any medical, therapeutic, or clinical claims. None of the compounds discussed have been approved by the U.S. Food and Drug Administration (FDA) for human use, diagnosis, treatment, or prevention of any disease or condition, except where explicitly noted for approved pharmaceutical forms.

This article does not constitute medical advice. These compounds are sold by PūrTONIX strictly as laboratory research reagents for in vitro use only. They are not intended for human or veterinary administration, dietary supplementation, or any therapeutic application.

All citations reference publicly available research. PūrTONIX makes no representations regarding the replication, accuracy, or applicability of any referenced study.

Compound Overview

Full name: Aminoisobutyryl-L-histidyl-D-2-naphthylalanyl-D-phenylalanyl-L-lysinamide
Molecular formula: C38H49N9O5
Molecular weight: 711.86 g/mol
Sequence / class: Synthetic 5-residue pentapeptide with non-natural amino acids (Aib-His-D-2-Nal-D-Phe-Lys-NH2)
Receptor targets: Growth hormone secretagogue receptor type 1a (GHS-R1a), a Gαq-coupled G-protein-coupled receptor
Research classification: Selective ghrelin-receptor (GHS-R1a) agonist research pentapeptide
PubChem CID: 9831659

Ipamorelin is a synthetic pentapeptide that engages the growth hormone secretagogue receptor type 1a (GHS-R1a). The compound contains five amino-acid residues, two of which are non-natural (aminoisobutyric acid at position 1 and D-2-naphthylalanine at position 3) and one of which is the D-stereoisomer of phenylalanine at position 4. The C-terminal lysine carries a primary amide. The molecular formula is C38H49N9O5 with a calculated mass near 712 daltons.

Published literature classifies ipamorelin as a selective ghrelin-receptor research peptide. Receptor-binding studies indicate that the compound engages GHS-R1a with reported in vitro selectivity over other G-protein-coupled receptor classes studied in published reference panels. The receptor is a Gαq-coupled GPCR with downstream signaling cascades that include phospholipase-C activation, inositol-trisphosphate generation, and intracellular calcium mobilization in cellular reporter systems.

The compact pentapeptide structure has made ipamorelin a useful analytical reference compound in published in vitro receptor pharmacology research. Investigators have used the molecule as a reference agonist when characterizing newer GHS-R1a ligands and when studying the selectivity profile of growth-hormone-secretagogue research peptides under matched cellular assay conditions.

Published research suggests that ipamorelin produces measurable, time-resolved signaling responses in GHS-R1a reporter cell lines that allow desensitization and receptor-trafficking kinetics to be characterized cleanly. The peptide has appeared in published comparative pharmacology research alongside related growth-hormone-secretagogue analytical reagents.

Molecular Structure

Ipamorelin

C38H49N9O5

Molecular weight 711.86 g/mol

Structure reference: Public domain chemical databases (PubChem CID 9831659).

In Vitro Research Applications

The following applications reflect published in vitro and preclinical research only. None of these applications constitute approved medical use.

Published in vitro applications of ipamorelin include its use as a reference agonist in GHS-R1a reporter cell lines, primary pituitary cell preparations from published animal research, and calcium-flux assays that read out the proximal Gαq signaling event. Investigators have used the peptide to characterize EC50 values for GHS-R1a activation and to benchmark selectivity ratios against other GPCR reporter systems in published in vitro literature.

Receptor-binding studies indicate that ipamorelin shows reported selectivity for GHS-R1a in published reference panels, with comparatively low activity against the related opioid and prolactin-release receptor systems that have been examined in the same studies. This selectivity profile has made the peptide a useful analytical probe for isolating GHS-R1a-specific pharmacology in cellular signaling research.

Comparative in vitro studies have included ipamorelin alongside other ghrelin-receptor reference compounds, allowing investigators to characterize how pentapeptide structure variations alter receptor engagement biochemistry under matched analytical conditions.

Published Research Highlights

[1]A study published in European Journal of Endocrinology (1998) examined the analytical characterization and reported in vitro selectivity profile of a synthetic pentapeptide ghrelin-receptor reference compound.
[2]A study published in Journal of Endocrinology (2000) investigated GHS-R1a receptor pharmacology using selective pentapeptide ligands in cellular reporter systems.
[3]A study published in Endocrine Reviews (2004) reviewed publicly available literature on growth hormone secretagogue research peptides and their in vitro receptor pharmacology.

The above represents a non-exhaustive summary of publicly available research. PūrTONIX does not endorse, validate, or make claims based on any referenced study.

Analytical Considerations for Laboratory Use

Published chemical property data indicate that ipamorelin is soluble in water and in standard aqueous assay buffers. The lyophilized peptide is stored at -20°C under inert atmosphere, with reconstituted stocks held in single-use aliquots to support reproducible signaling-assay measurements. The non-natural amino-acid residues confer stability against several common peptidase classes in cellular media.

Reconstitution for in vitro receptor pharmacology is standard in bacteriostatic water or in assay-matched buffer. Analytical characterization commonly includes reverse-phase HPLC purity analysis, electrospray mass spectrometry confirming the pentapeptide sequence and C-terminal amidation, and residual solvent screening per ICH Q3C.

Handling recommendations are based on published chemical property data and are intended for qualified laboratory personnel only.

Research-Grade Sourcing Standards

GHS-R1a calcium-flux assays at sub-nanomolar concentrations are sensitive to deletion-peptide impurities. Material characterized for high chromatographic purity with documented C-terminal amidation are the analytical baseline for reproducible cellular signaling research.

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