Imaging the impact of cyclosporin A and dipyridamole on P-glycoprotein (ABCB1) function at the blood-brain barrier: A [11C]-N-desmethyl-loperamide PET study in nonhuman primates

Cyclosporin A (CsA) and dipyridamole (DPy) are potent inhibitors of the P-glycoprotein (P-gp; ABCB1) in vitro. Their efficacy at inhibiting P-gp at the blood-brain barrier (BBB) is difficult to predict. Efficient and readily available (i.e. marketed) P-gp inhibitors are needed as probes to investigate the role of P-gp at the human BBB. In this study, the P-gp inhibition potency at the BBB of therapeutic doses of CsA or DPy was evaluated in baboons using Positron Emission Tomography (PET) imaging with [C-11]-N-desmethyl-loperamide ([C-11]dLop), a radiolabeled P-gp substrate. The preparation of dLop as authentic standard and [C-11] dLop as radiotracer were revisited so as to improve their production yields. [C-11] dLop PET imaging was performed in the absence (n = 3, baseline condition) and the presence of CsA (15 mg/kg/h i.v., n = 3). Three animals were injected with i.v. DPy at either 0.56 or 0.96 or 2 mg/kg (n = 1), corresponding to the usual, maximal and twice the maximal dose in patients, respectively, administered immediately before PET. [C-11] dLop brain kinetics as well as [C-11] dLop kinetics and radiometabolites in arterial plasma were measured to calculate [C-11] dLop area-under the time-activity curve from 10 to 30 min in the brain (AUC(brain)) and in plasma (AUC(plasma)). [C-11] dLop brain uptakewas described by AUCR = AUC(brain)/AUC(plasma). CsA as well as DPy did not measurably influence [C-11] dLop plasma kinetics and metabolism. Baseline AUCR (0.85 +/- 0.29) was significantly enhanced in the presence of CsA (AUCR = 10.8 +/- 3.6). Injection of pharmacologic dose of DPy did not enhance [C-11] dLop brain distribution with AUCR being 1.2, 0.9 and 1.1 after administration of 0.56, 0.96 and 2 mg/kg DPy doses, respectively. We used [C-11] dLop PET imaging in baboons, a relevant in vivo model of P-gp function at the BBB, to show the P-gp inhibition potency of therapeutic dose CsA. Despite in vitro P-gp inhibition potency, usual doses DPy are not likely to inhibit P-gp function at the BBB. (C) 2016 Elsevier B.V. All rights reserved.