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Adenosine receptor agonists and antagonists target A1, A2A, A2B and A3, the four G protein-coupled adenosine receptors. The International Union of Pharmacology (IUPHAR) set out this nomenclature in 2001. A1 and A3 receptors usually inhibit adenylyl cyclase, while A2A and A2B receptors stimulate it. In 2008 the human A2A receptor was crystallized bound to an antagonist at 2.6 Å resolution. Ligands in this category include the A2A agonist CGS 21680 HCl Hydrate, the A2A antagonist istradefylline and the A3 agonist IB-MECA. Xanthines such as theophylline block several subtypes, and 5-Iodotubercidin inhibits adenosine kinase, which phosphorylates adenosine.
2-Cl-5'-AMP is a 5'-AMP analogue that functions primarily by interacting with adenosine receptors. This compound exhibits key biological activity in receptor mapping research, facilitating the study of adenosine receptor signaling pathways and their physiological roles. Its use in biochemical assays enables a deeper understanding of receptor-ligand interactions and their implications in various biological systems.
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DU172 is a potent ligand for the adenosine A1 receptor (A1AR), exhibiting an IC50 of 24.9 nM. It also shows an affinity for the A2A receptor (A2AAR) with an IC50 of 0.42 μM. This compound is valuable for studies involving adenosine receptor signaling and can aid in research related to cardiovascular, neuroprotective, and anti-inflammatory mechanisms.
Heterobivalent ligand-1 is a potent heterobivalent ligand targeting the Adenosine A2A-dopamine D2 receptor heteromer, exhibiting binding affinities of 2.1 nM for A2AR and 0.13 nM for D2R. This compound is valuable for studying receptor heteromerization and signal transduction in neurological research. Its unique design enables exploration of the functional interplay between these receptors in various biological contexts.
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I-AB-MECA is a selective ligand for the A3 adenosine receptor (A3AR), functioning as an important tool in receptor binding studies. This radioligand is utilized in various biological research applications, including pharmacological profiling and understanding adenosine receptor signaling pathways. It aids in elucidating the role of A3AR in various physiological and pathological processes.
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LUF 5608 is a potent adenosine A1 receptor ligand, characterized by a high affinity of 7.7 nM. This compound serves as a valuable tool in research exploring adenosine signaling pathways and related physiological processes. Its selective interaction with the A1 receptor makes it suitable for studies on neuroprotection, cardiovascular function, and other areas of pharmacological interest.
MNI-444 is a blood-brain barrier-permeable ligand for the adenosine A2A receptor (A2AR). This compound serves as a valuable tool in the investigation of non-dopaminergic pathways relevant to Parkinson's disease research. Its ability to selectively interact with A2AR positions it as a promising candidate for studying therapeutic strategies targeting neurodegenerative disorders.
2-Thioadenosine is a selective ligand for the A1 adenosine receptor (A1AR), exhibiting a Ki value of 80.3 nM. This compound demonstrates minimal affinity for the A2A, A2B, and A3 adenosine receptor subtypes. Additionally, 2-Thioadenosine serves as a precursor for the synthesis of fluorescent agonists that selectively target the A3 adenosine receptor, making it valuable for research in pharmacology and receptor biology.
