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KD: 1.4 nM and 1.9 nM for human and rat P2X7 receptors, respectivley

The P2X7 receptor has intriguing biophysical properties, activates a diverse range of cellular events and mediates a wide range of functional effects. The P2X7 receptor is an ATP-gated ion channel known for its cytotoxic activity. However, recent evidence suggests a role for P2X7 in cell proliferation. AZ 10606120 is a P2X7 receptor antagonist.

In vitro: Binding of [3H]-AZ 10606120 was higher in membranes prepared from cells expressing P2X7 receptors than from control cells and was inhibited by ATP suggesting labelled sites represented human P2X7 receptors. Binding was reversible, saturable and modulated by P2X7 receptor ligands. The positive cooperativity observed suggests that binding of AZ 10606120 to one subunit in the P2X7 receptor complex enhances subsequent binding to other P2X7 subunits in the same complex. The negative cooperative effects of ATP suggest that ATP and AZ 10606120 bind at separate, interacting, sites on the P2X7 receptor [1].

In vivo: Intratumor injection of AZ10606120 caused a strong inhibition of tumor growth in B16-inoculated C57Bl/6 mice and caused in parallel a large reduction in VEGF staining and vessel formation [2].

Clinical trial: Up to now, AZ 10606120 is still in the preclinical development stage.

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