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Vol. 83, No. 5-6, 2006
Issue release date: October 2006
Section title: Original Paper
Neuroendocrinology 2006;83:295–302
(DOI:10.1159/000095338)

Effects of Estrogen and Related Agents upon Methamphetamine-Induced Neurotoxicity within an Impaired Nigrostriatal Dopaminergic System of Ovariectomized Mice

Liu B. · Dluzen D.E.
aDepartment of Anatomy, Northeastern Ohio Universities College of Medicine, Rootstown, Ohio, USA; bCenter for New Drugs Evaluation, School of Pharmaceutical Sciences, Shandong University, Jinan, P.R. China

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Published online: 11/13/2006

Number of Print Pages: 8
Number of Figures: 2
Number of Tables: 2

ISSN: 0028-3835 (Print)
eISSN: 1423-0194 (Online)

For additional information: http://www.karger.com/NEN

Abstract

Estrogen increases methamphetamine (MA)-induced neurotoxicity within the impaired nigrostriatal dopaminergic (NSDA) system of ovariectomized female mice, as defined by enhanced striatal dopamine (DA) depletion. In this study we compared the effects of a lower dose of estradiol benzoate (EB, 1 µg) with related agents – tamoxifen (TMX, 12.5 µg), testosterone (5 µg) and dehydroepiandrosterone (DHEA, 3 mg) in this paradigm. In experiment 1, ovariectomized mice received an initial treatment with MA. At 1 week after MA, mice were treated with EB, TMX, testosterone, DHEA or oil vehicle and 24 h later a second MA treatment. Striatal DA and 3,4-dihydroxyphenylacetic acid (DOPAC) concentrations in the MA-treated groups were decreased compared to the non-MA-treated control. Neither EB nor any of the other agents tested showed enhanced neurodegenerative or neuroprotective effects against a second MA invasion. To verify that estrogen was capable of showing a neuroprotective effect under a condition of two administrations of MA, in experiment 2, EB was administered either once or twice prior to each of the two MA treatments. EB treatment prior to the first MA invasion or first and second MA protected the NSDA system against DA and DOPAC depletion. These results imply that a lower dose of EB, TMX, testosterone and DHEA cannot exert neurodegenerative or neuroprotective effects in the impaired NSDA model. However, EB administered prior to the introduction of neurotoxicity can protect the NSDA system. This study may provide an understanding of the variations in results on the effects of estrogen upon the NSDA neurodegenerative disorder, Parkinson’s disease.


Article / Publication Details

First-Page Preview
Abstract of Original Paper

Published online: 11/13/2006

Number of Print Pages: 8
Number of Figures: 2
Number of Tables: 2

ISSN: 0028-3835 (Print)
eISSN: 1423-0194 (Online)

For additional information: http://www.karger.com/NEN


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Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in goverment regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
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