Quantitative investigation of hepatobiliary transport of [11C]telmisartan in humans by PET imaging.

Abstract:

:The pharmacokinetics of telmisartan are nonlinear within the clinical dose range. To identify the underlying mechanism of this nonlinearity, we conducted a PET study in healthy subjects using [11C]telmisartan. Eight healthy male subjects were enrolled in a 2-way crossover study. PET imaging was performed after intravenous administration of [11C]telmisartan with or without a 1-h oral predose of two 40 mg Micardis® tablets. About 60% of the injected [11C]telmisartan accumulated in the liver within 10 min after injection. With predosing of 80 mg telmisartan, the systemic elimination of [11C]telmisartan was slightly delayed, but the liver exposure started to decrease earlier and biliary excretion was greatly enhanced. Hepatic uptake clearance of the radioactivity was not changed by telmisartan predosing, whereas the biliary clearance of radioactivity from the liver was significantly increased. Thus, the alteration in the pharmacokinetics of the radioactivity could not be explained simply by the saturation of hepatic uptake. Therefore, other mechanisms, such as the saturation of intracellular binding of telmisartan and/or its glucuronide, and the glucuronidation of telmisartan by uridine 5'-diphospho-glucuronosyltransferases, should be considered. This is the first reported human PET study using [11C]telmisartan, the results of which can assist understanding of the hepatobiliary transport of telmisartan in humans.

authors

Maeda K,Ohnishi A,Sasaki M,Ikari Y,Aita K,Watanabe Y,Kusuhara H,Sugiyama Y,Senda M

doi

10.1016/j.dmpk.2019.02.004

subject

Has Abstract

pub_date

2019-10-01 00:00:00

pages

293-299

issue

5

eissn

1347-4367

issn

1880-0920

pii

S1347-4367(18)30152-6

journal_volume

34

pub_type

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