18 F-Labeled Derivatives of Irbesartan for Angiotensin II Receptor PET Imaging.

Abstract:

:The renin angiotensin aldosterone system (RAAS) is a hormonal cascade involved in the regulation of blood pressure and electrolyte balance, and represents a common target for the treatment of various diseases including hypertension, heart failure, and diabetes. Herein we present a novel 18 F-labeled derivative of the drug irbesartan, one of the most prescribed angiotensin II type 1 receptor (AT1 R) antagonists, for in vivo positron emission tomography (PET). This allows the in vivo measurement of AT1 R expression, and thus the evaluation of functional changes in its expression under pathophysiological conditions. We followed various synthetic approaches optimized for the introduction of fluorine into different positions of the aliphatic side chain of irbesartan. Radioligand binding studies revealed that fluorine atoms at specified positions (α-position (IC50 =6.6 nm) and δ-position (IC50 =8.5 nm) of the aliphatic side chain) do not alter the binding properties of irbesartan (IC50 =1.6 nm). After successful radiolabeling with fluorine-18 in a radiochemical yield of 11 %, we observed high renal uptake in healthy rats and pigs, which could be decreased by pretreatment with the parent compound irbesartan.

journal_name

ChemMedChem

journal_title

ChemMedChem

authors

Hoffmann M,Chen X,Hirano M,Arimitsu K,Kimura H,Higuchi T,Decker M

doi

10.1002/cmdc.201800638

subject

Has Abstract

pub_date

2018-12-06 00:00:00

pages

2546-2557

issue

23

eissn

1860-7179

issn

1860-7187

journal_volume

13

pub_type

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