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Effects of Chronic Administration of Methamphetamine in Glycogen Synthesis in Brain Cortexg Slices pp.687-693
Published Date 1960/4/1
DOI https://doi.org/10.11477/mf.1431906397

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  • Abstract
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Our previous studies (J. Neurochem. 4, 161,1959) indicated that the administration of metham-phetamine to guinea pigs over a long period pro-duced a significant decrease in aerobic glycolysisin brain tissue examined in vitro.

The present report describes the synthesis ofglycogen in brain cortex slices in the same ex-perimental conditions as previously reported. Re-sults are also presented on the effects of K+ ion,DNP and chlorpromazine on glycogen synthesisin brain cortex slices.

Experimental conditions for studying glycogensynthesis was followed by the modified method ofLeBaron (1955).

As shown in Table 1, in was found that; (1) glycogen synthesis in brain cortex sliceswas decreased by concentration of 100mM KCIand 50 μM DNP, while the methamphetamine(1.1×10M) increased glycogen synthesis about 150per cent of the control value.

(2) increasing concentrations of chlorpromazinein the medium brought about a marked inhibitionof glycogen synthesis.

(3) in the acute experiment (experimentalanimals received large amount of methamphet-amine subcutaneouly, and then were killed), theglycogen synthesis in brain tissue was increasedabout 140 per cent of the control value.

(4) in the chronic experiment (experimentalanimals received daily 6mg/kg of methamphet-amine over the periods of 3 weeks, and then werekilled), the glycogen synthesis was extremely in-creased about 240 per cent of controls.

Changes in glycogen synthesis are also describedat intervals from 1 week to 3 weeks after cessa-tion of the daily injection of methamphetamine.


Copyright © 1960, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1243 印刷版ISSN 0001-8724 医学書院

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