Kinetic study of benzyl [1-14C]acetate as a potential probe for astrocytic energy metabolism in the rat brain: Comparison with benzyl [2-14C]acetate.

Autor:	Okada M; Molecular Probe Program, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan mokada@nirs.go.jp., Yanamoto K; Division of Health Sciences, Osaka University Graduate School of Medicine, Suita, Japan., Kagawa T; Division of Health Sciences, Osaka University Graduate School of Medicine, Suita, Japan., Yoshino K; Division of Health Sciences, Osaka University Graduate School of Medicine, Suita, Japan., Hosoi R; Division of Health Sciences, Osaka University Graduate School of Medicine, Suita, Japan., Abe K; Department of Molecular Imaging in Medicine, Osaka University Graduate School of Medicine, Suita, Japan Department of Drug Metabolism & Pharmacokinetics, Research Laboratory for Development, Shionogi & Co., Ltd., Toyonaka, Japan., Zhang MR; Molecular Probe Program, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan., Inoue O; Division of Health Sciences, Osaka University Graduate School of Medicine, Suita, Japan.
Jazyk:	angličtina
Zdroj:	Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism [J Cereb Blood Flow Metab] 2016 Feb; Vol. 36 (2), pp. 442-50. Date of Electronic Publication: 2015 Sep 30.
DOI:	10.1177/0271678X15606144
Abstrakt:	Brain uptake of [(14)C]acetate has been reported to be a useful marker of astrocytic energy metabolism. In addition to uptake values, the rate of radiolabeled acetate washout from the brain appears to reflect CO2 exhaustion and oxygen consumption in astrocytes. We measured the time-radioactivity curves of benzyl [1-(14)C]acetate ([1-(14)C]BA), a lipophilic probe of [1-(14)C]acetate, and compared it with that of benzyl [2-(14)C]acetate ([2-(14)C]BA) in rat brains. The highest brain uptake was observed immediately after injecting either [1-(14)C]BA or [2-(14)C]BA, and both subsequently disappeared from the brain in a single-exponential manner. Estimated [1-(14)C]BA washout rates in the cerebral cortex and cerebellum were higher than those of [2-(14)C]BA. These results suggested that [1-(14)C]BA could be a useful probe for estimating the astrocytic oxidative metabolism. The [1-(14)C]BA washout rate in the cerebral cortex of immature rats was lower than that of mature rats. An autoradiographic study showed that the washout rates of [1-(14)C]BA from the rat brains of a lithium-pilocarpine-induced status epilepticus model were not significantly different from the values in control rat brains except for the medial septal nucleus. These results implied that the enhancement of amino acid turnover rate rather than astrocytic oxidative metabolism was increased in status epilepticus. (© The Author(s) 2015.)
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu