Inhibition of carnitine-acyl transferase I by oxfenicine studied in vivo with [11C]-labeled fatty acids.

Abstract:

METHODS:Anesthetized pigs were studied with [(11)C]-labeled fatty acids (FAs) with carbon chain length ranging from 8 to 16 carbon atoms, during control conditions and during inhibition of carnitine-palmitoyl transferase I (CPT I) with oxfenicine. The myocardial uptake of [(11)C]-FAs from blood was measured together with the relative distribution of [(11)C]-acyl-CoA between rapid mitochondrial oxidation and incorporation into slow turnover lipid pools in the heart. RESULTS:During baseline conditions, the fractional oxidative utilization of palmitate was almost as high as that of carnitine-independent short-chain FAs, unless the carnitine shuttle was inhibited by high levels of lactate. Inhibition of CPT I almost completely blocked the oxidative pathway for palmitic acid and reduced the fractional oxidative utilization, while the rate of oxidative metabolism of acyl-CoA was unaffected. CONCLUSIONS:[(11)C]-Labeled FAs allow rapid oxidation to be well separated from esterification into slow turnover lipid pools in the heart of anaesthetized pigs. The fractional oxidative utilization of [(11)C]-palmitate serves well to characterize, in vivo, the carnitine-dependent transfer of long-chain FAs.

journal_name

Nucl Med Biol

authors

Angsten G,Valind S,Takalo R,Neu H,Meurling S,Långström B

doi

10.1016/j.nucmedbio.2005.03.003

keywords:

subject

Has Abstract

pub_date

2005-07-01 00:00:00

pages

495-503

issue

5

eissn

0969-8051

issn

1872-9614

pii

S0969-8051(05)00071-5

journal_volume

32

pub_type

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