Overview
Agouti-related protein (AGRP) is a 132-amino acid neuropeptide primarily expressed in the arcuate nucleus of the hypothalamus. It plays a crucial role in energy balance regulation by acting as an endogenous antagonist of melanocortin receptors MC3R and MC4R. AGRP is part of the central melanocortin system, which integrates peripheral metabolic signals to control food intake and energy expenditure. The peptide shares structural homology with agouti signaling protein (ASIP) and contains a characteristic C-terminal cysteine-rich domain. AGRP expression is upregulated during fasting states and downregulated after feeding, making it a key player in appetite regulation. Its discovery has provided significant insights into the neurobiological mechanisms underlying obesity and metabolic disorders.
Physical and Chemical Properties
AGRP is a moderately sized neuropeptide with molecular weight varying slightly between species (approximately 10-12 kDa). The human variant consists of 132 amino acids and contains multiple disulfide bonds that contribute to its stable tertiary structure. These bonds are crucial for proper receptor binding and biological activity. As a research chemical, AGRP is typically supplied as a lyophilized powder that appears white to off-white in color. It demonstrates good solubility in aqueous buffers and neutral pH solutions. The peptide is relatively stable when stored properly at -20°C, though repeated freeze-thaw cycles should be avoided to maintain integrity.
Main Applications
In research settings, AGRP is primarily used to study energy homeostasis and feeding behavior. Scientists employ it to investigate the melanocortin signaling pathway and its role in metabolic regulation. Pharmaceutical research explores AGRP as a potential target for obesity treatments, with antagonists being developed to curb its orexigenic effects. Neuroscience studies utilize AGRP to understand neural circuits controlling appetite. The peptide is also valuable in creating animal models of metabolic disorders. Additionally, AGRP finds application in basic research exploring the connection between energy balance and other physiological processes like reproduction and glucose metabolism.
Safety and Storage
As a research chemical, AGRP should be handled with standard laboratory precautions. While not classified as highly hazardous, proper personal protective equipment including gloves and lab coats should be worn when handling. Avoid inhalation of powder and direct contact with skin or eyes. For long-term storage, lyophilized AGRP should be kept at -20°C in a desiccated environment. Reconstituted solutions are typically stable for several weeks when stored at 4°C, though for extended storage, aliquoting and freezing at -80°C is recommended. Always check manufacturer specifications for specific storage recommendations as formulations may vary.
B2B Procurement Guide
When sourcing AGRP for research purposes, verify the species specificity (human, mouse, or rat variants) matches your experimental needs. Reputable suppliers should provide certificates of analysis including purity assessment (typically >95% by HPLC) and mass spectrometry verification. Consider ordering smaller quantities initially for validation before larger purchases. Lead times for custom synthesis can be several weeks, so plan accordingly. For high-throughput applications, inquire about bulk pricing tiers. Some suppliers offer modified or tagged versions (e.g., fluorescent labels) for specialized applications. Always confirm shipping conditions (typically dry ice for peptides) to ensure product integrity upon arrival.
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