Propofol restores brain microvascular function impaired by high glucose via the decrease in oxidative stress.

Propofol restores brain microvascular function impaired by high glucose via the decrease in oxidative stress. Research Abstract Details 

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Propofol restores brain microvascular function impaired by high glucose via the decrease in oxidative stress. Abstract Text:

Katsutoshi Nakahata,Hiroyuki Kinoshita,Toshiharu Azma,Naoyuki Matsuda,Keiko Hama-Tomioka,Masanori Haba,Yoshio Hatano,

BACKGROUND: Vascular dysfunction induced by hyperglycemia has not been studied in cerebral parenchymal circulation. The current study was designed to examine whether high glucose impairs dilation of cerebral parenchymal arterioles via nitric oxide synthase, and whether propofol recovers this vasodilation by reducing superoxide levels in the brain. METHODS: Cerebral parenchymal arterioles in the rat brain slices were monitored using computer-assisted videomicroscopy. Vasodilation induced by acetylcholine (10 to 10 m) was obtained after the incubation of brain slices for 60 min with any addition of l-glucose (20 mm), d-glucose (20 mm), or propofol (3 x 10 or 10 m) in combination with d-glucose (20 mm). Superoxide production in the brain slice was determined by dihydroethidium (2 x 10 m) fluorescence. RESULTS: Addition of d-glucose, but not l-glucose, reduced arteriolar dilation by acetylcholine, whereas the dilation was abolished by the neuronal nitric oxide synthase inhibitor S-methyl-l-thiocitrulline (10 m). Both propofol and the superoxide dismutase mimetic Tempol (10 m) restored the arteriolar dilation in response to acetylcholine in the brain slice treated with d-glucose. Addition of d-glucose increased superoxide production in the brain slice, whereas propofol, Tempol, and the nicotinamide adenine dinucleotide phosphate (NAD[P]H) oxidase inhibitor apocynin (1 mm) similarly inhibited it. CONCLUSIONS: Clinically relevant concentrations of propofol ameliorate neuronal nitric oxide synthase-dependent dilation impaired by high glucose in the cerebral parenchymal arterioles via the effect on superoxide levels. Propofol may be protective against cerebral microvascular malfunction resulting from oxidative stress by acute hyperglycemia.

Propofol restores brain microvascular function impaired by high glucose via the decrease in oxidative stress. Publishing Authors By Initials

K Nakahata,H Kinoshita,T Azma,N Matsuda,K Hama-Tomioka,M Haba,Y Hatano,

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Propofol restores brain microvascular function impaired by high glucose via the decrease in oxidative stress. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Anesthesiology

VOLUME: 108

Page Numbers: 269-75

Journal Abbreviation: Anesthesiology

ISSN: 1528-1175

DAY: 23

MONTH: Feb

YEAR: 2008

Propofol restores brain microvascular function impaired by high glucose via the decrease in oxidative stress. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Propofol restores brain microvascular function impaired by high glucose via the decrease in oxidative stress.

AFFILIATION: Department of Anesthesiology, Wakayama Medical University, Wakayama, Japan.

Country: United States

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MEDLINETA: Anesthesiology

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