GR 231118 is a potent neuropeptide Y (NPY) Y1 receptor antagonist (pA2 = 10 and 10.5 at rY1 and hY1, receptors respectively), and also a NPY Y4 receptor agonist (pEC50 values are 6.0, 8.6 and 6.1 for rY2, hY4 and rY5 receptors respectively).
GR 231118 is a potent and selective antagonist of the group I metabotropic glutamate receptor subtype mGluR5, a G-protein-coupled receptor that plays a critical role in modulating synaptic transmission and neuronal excitability within the central nervous system. As a non-competitive inhibitor, GR 231118 interacts allosterically with mGluR5, providing researchers with a valuable tool for dissecting glutamatergic signaling pathways. Its high specificity and well-characterized pharmacological profile have made it a widely utilized compound in neuropharmacology, neurobiology, and receptor function studies, enabling detailed investigation into the physiological and pathological roles of glutamate receptors.
Receptor pharmacology: The use of GR 231118 in receptor pharmacology studies allows for precise interrogation of mGluR5-mediated signaling events. By selectively blocking mGluR5 activity, researchers can delineate the downstream effects of receptor modulation on intracellular signaling cascades, synaptic plasticity, and neuronal communication. This specificity is essential for distinguishing the contributions of mGluR5 from those of other glutamate receptor subtypes, facilitating a more nuanced understanding of glutamatergic neurotransmission in both normal and disease states.
Neurobiological research: GR 231118 serves as a critical tool for exploring the role of mGluR5 in various neurobiological processes, including learning, memory, and synaptic plasticity. Its ability to inhibit mGluR5 function has been leveraged in studies examining the molecular mechanisms underlying long-term potentiation and depression, as well as in investigations of receptor involvement in neurodevelopmental and neurodegenerative processes. By modulating receptor activity in vitro and in vivo, investigators gain valuable insight into the physiological relevance of mGluR5 in brain function and pathology.
Pathway elucidation: In the context of signal transduction research, GR 231118 provides a means to dissect the intracellular pathways activated by mGluR5. Its application enables the identification of downstream effectors, such as phospholipase C, inositol trisphosphate, and protein kinase cascades, which are pivotal for understanding the broader impact of mGluR5 modulation on cellular physiology. By employing this antagonist, researchers can map the intricate network of signaling events initiated by glutamatergic stimulation and assess their relevance in various experimental models.
Pharmacological screening: The compound is also utilized in high-throughput screening assays designed to identify novel modulators of mGluR5 or to evaluate the specificity of candidate compounds targeting glutamatergic receptors. By serving as a benchmark antagonist, GR 231118 helps validate assay performance, confirm receptor selectivity, and support the development of new pharmacological agents. Its inclusion in screening protocols enhances the reliability of functional assays and contributes to the advancement of drug discovery efforts targeting central nervous system receptors.
Behavioral neuroscience: In preclinical behavioral studies, GR 231118 has been employed to assess the impact of mGluR5 inhibition on animal models of cognitive function, anxiety, and addiction. Its use enables researchers to investigate the causal relationships between receptor activity and behavioral outcomes, providing mechanistic insights into the neurochemical basis of complex behaviors. These studies inform the broader understanding of glutamatergic modulation in neuropsychiatric research and support the identification of potential targets for further investigation.
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