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Drastic increase in nitric oxide content in rat brain under halothane anesthesia revealed by EPR method.

Abstract：

:A drastic increase in nitric oxide (NO) content was revealed by the EPR method in rat brain cortex and cerebellum under halothane anesthesia. The NO scavenger diethyldithiocarbamate sodium salt (DETC) and ferrous citrate were injected into adult rats 30-60 min before anesthesia. Rats were anesthetized by inhalation of a halothane-oxygen mixture (1%, 1.5%, 2%, or 4%). After different times of anesthesia, rats were decapitated, and brain cortex and cerebellum were dissected, frozen in liquid nitrogen, and subjected to EPR spectroscopy. The concentration of NO was determined from the NO-Fe-DETC radical spectrum. In control animals, NO content in the cerebellum was only 68% of that in the cortex. We observed a time-dependent increase in NO content in the cortex and cerebellum of rats anesthetized with 1.5% halothane. In brain cortex, the NO level increased to six times that of waking animals after 30 min and remained at this level up to 60 min of anesthesia. In cerebellum the changes were less drastic, the NO level showing only a 2-fold increase. The same effect was produced by 1% and 2% halothane. Ketamine, chloral hydrate, and pentobarbital were used as reference drugs. None of these anesthetics produced effects similar to those of halothane. In ketamine-anesthetized rat brain, the NO content slightly decreased. Pentobarbital and chloral hydrate produced an insignificant increase in NO. Data are discussed in the context of possible interference of halothane in the regulation of nitric oxide synthase activity.

journal_name

Biochem Pharmacol

journal_title

Biochemical pharmacology

authors

Sjakste N,Baumane L,Meirena D,Lauberte L,Dzintare M,Kalviņs I

doi

10.1016/s0006-2952(99)00281-6

subject

Has Abstract

pub_date

1999-12-15 00:00:00

pages

1955-9

issue

12

eissn

0006-2952

issn

1873-2968

pii

S0006295299002816

journal_volume

58

pub_type

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