Abstract
Various radioligands have been used to characterize and quantify the platelet P2Y12 receptor, which share several weaknesses: (a) they are metabolically unstable and substrates for ectoenzymes, (b) they are agonists, and (c) they do not discriminate between P2Y1 and P2Y12. We used the [3H]PSB-0413 selective P2Y12 receptor antagonist radioligand to reevaluate the number of P2Y12 receptors in intact platelets and in membrane preparations. Studies in humans showed that: (1) [3H]PSB-0413 bound to 425 ± 50 sites/platelet (K D = 3.3 ± 0.6 nM), (2) 0.5 ± 0.2 pmol [3H]PSB-0413 bound to 1 mg protein of platelet membranes (K D = 6.5 ± 3.6 nM), and (3) competition studies confirmed the known features of P2Y12, with the expected rank order of potency: AR-C69931MX > 2MeSADP ≫ ADPβS > ADP, while the P2Y1 ligand MRS2179 and the P2X1 ligand α,β-Met-ATP did not displace [3H]PSB-0413 binding. Patients with severe P2Y12 deficiency displayed virtually no binding of [3H]PSB-0413 to intact platelets, while a patient with a dysfunctional P2Y12 receptor had normal binding. Studies in mice showed that: (1) [3H]PSB-0413 bound to 634 ± 87 sites/platelet (K D = 14 ± 4.5 nM) and (2) 0.7 pmol ± 0.3 [3H]PSB-0413 bound to 1 mg protein of platelet membranes (K D = 9.1 ± 5.3 nM). Clopidogrel and other thiol reagents like pCMBS or DTT abolished the binding both to intact platelets and membrane preparations. Therefore, [3H]PSB-0413 is an accurate and selective tool for radioligand binding studies aimed at quantifying P2Y12 receptors, to identify patients with P2Y12 deficiencies or quantify the effect of P2Y12 targeting drugs.
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Abbreviations
- AR-C67085MX:
-
2-Propylthioadenosine-5′-adenylic acid (1,1-chloro-1-phosphonomethyl-1-phosphonyl)anhydride
- AR-C69931MX (cangrelor):
-
N 6-(2-Methylthioethyl)-2-(3,3,3-trifluoropropylthio)adenosine-5′-adenylic acid (1,1-chloro-1-phosphonomethyl-1-phosphonyl)anhydride
- [3H]PSB-0413:
-
[3H]2-Propylthioadenosine-5′-adenylic acid (1,1-chloro-1-phosphonomethyl-1-phosphonyl)anhydride
- PSB-0412 (precursor of [3H]PSB-0413):
-
2-Propargylthioadenosine-5′-adenylic acid (1,1-chloro-1-phosphonomethyl-1-phosphonyl)anhydride
- MRS2179:
-
N 6-Methyl-2′-deoxyadenosine-3′,5′-bisphosphate
- MRS2500:
-
2-Iodo-N 6-methyl-(N)-methanocarba-2′-deoxyadenosine-3′,5′-bisphosphate)
- pCMBS:
-
para-Chloromercuribenzene sulfonic acid
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A. El-Tayeb is on leave from the University of Al-Azhar, Assiut, Egypt.
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Ohlmann, P., Lecchi, A., El-Tayeb, A. et al. The platelet P2Y12 receptor under normal and pathological conditions. Assessment with the radiolabeled selective antagonist [3H]PSB-0413. Purinergic Signalling 9, 59–66 (2013). https://doi.org/10.1007/s11302-012-9329-0
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DOI: https://doi.org/10.1007/s11302-012-9329-0