AOD-9604 is a synthetic peptide fragment derived from the C-terminal region of human growth hormone (hGH), specifically corresponding to amino acid residues 176–191 of the full-length protein. Researchers isolated this segment to study the portions of the hGH sequence responsible for metabolic activity, particularly fat metabolism, independently of the growth-promoting effects associated with the intact hormone. Produced via solid-phase peptide synthesis (SPPS), AOD-9604 is classified as a research-grade peptide and has attracted consistent interest in metabolic biology, adipocyte cell biology, and preclinical pharmacology.
Molecular Structure and Key Properties
AOD-9604 is a 16-amino acid peptide with the sequence Tyr-Leu-Arg-Ile-Val-Gln-Cys-Arg-Ser-Val-Glu-Gly-Ser-Cys-Gly-Phe. Two cysteine residues within the sequence form a disulfide bridge, creating a constrained loop structure that is central to the peptide’s conformational stability and bioactivity in cell-based assays. This internal cyclization distinguishes AOD-9604 from linear peptides of comparable size and influences how it interacts with receptor targets studied in metabolic research. The molecular weight is approximately 1815 Da, and the compound is generally soluble in aqueous buffers, making it compatible with standard cell culture and in vitro assay conditions. The disulfide bond means the compound is sensitive to strongly reducing environments, which is an important practical consideration for assay design and storage preparation.
Research Applications
The primary area of investigation for AOD-9604 in preclinical research is lipid metabolism, specifically the mechanisms governing lipolysis — the breakdown of stored fat — and lipogenesis — the synthesis of new fat — in adipocyte models. In vitro studies using adipocyte cell lines and primary fat cell cultures have examined how AOD-9604 influences the rate of fatty acid release and the activity of enzymes involved in triglyceride turnover. Researchers have used these models to investigate whether the compound’s effects operate through beta-adrenergic receptors or via pathways downstream of hGH receptor signaling, given that AOD-9604 does not appear to bind the classical GH receptor with the same affinity as the intact hormone.
Beyond adipocyte biology, some preclinical work has explored AOD-9604 in the context of cartilage and bone cell models. Research groups have used chondrocyte cultures to examine the compound’s interaction with extracellular matrix components and its effects on cell proliferation markers. These studies sit at the intersection of metabolic and musculoskeletal research and represent a secondary but growing area of scientific inquiry for this peptide fragment.
Analytical Use and Sourcing Considerations
In laboratory settings, AOD-9604 is typically reconstituted in sterile water or dilute acetic acid solutions, with working concentrations prepared fresh before use to minimize degradation. Because the disulfide bridge is integral to biological activity in cell assays, researchers should avoid reconstitution or storage conditions that introduce reducing agents such as DTT or beta-mercaptoethanol. Stability is maintained best under frozen conditions at −20°C or lower, with minimal freeze-thaw cycling.
For research applications where quantitative results are required, sourcing AOD-9604 at high purity is essential. Analytical-grade material should be characterized by reverse-phase high-performance liquid chromatography (RP-HPLC) to confirm purity, with mass spectrometry — typically electrospray ionization or MALDI — used to verify molecular identity. Certificates of analysis should document both purity percentage and confirmed molecular mass. Researchers should also confirm disulfide bond integrity, as reduced or misfolded variants will produce inconsistent results in bioassay applications. Institutions sourcing this compound for regulatory-adjacent work may additionally require endotoxin testing data.
AOD-9604 continues to attract research interest because it offers a structurally defined tool for isolating and studying discrete metabolic signaling events associated with a well-characterized parent protein, making it a useful reagent in mechanistic studies of lipid biology and cell metabolism.
For Research Use Only. Not for human consumption. All compounds described in this article are supplied as analytical-grade reagents for institutional in vitro laboratory research only. Not intended to diagnose, treat, cure, or prevent any disease. These statements have not been evaluated by the Food and Drug Administration.
