Linked Life Data

10800969

Source:http://linkedlifedata.com/resource/pubmed/id/10800969

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pubmed-article:10800969pubmed:abstractText[3H]Dihydrotetrabenazine ([3H]DTBZ), a specific ligand for the vesicular monoamine transporter (VMAT2), has been used to characterize the integrity of monoaminergic nerve terminals in experimental animals and humans. The purpose of the present studies was to compare the loss of VMAT2 binding with the loss of other neurochemical markers of the dopamine (DA) nerve terminals in mice treated with neurotoxic doses of methamphetamine (METH) or MPTP. Profound decreases (> or =70%) in DA content, tyrosine hydroxylase activity, and PH]carbomethoxy-3-(4-fluorophenyl)tropane binding to the DA transporter were observed in striatal homogenates at both 1 and 6 days after exposure to the neurotoxins. It is surprising that no significant loss of [3H]DTBZ binding in the homogenates was observed at 1 day after exposure, although a significant loss (-50%) was apparent 6 days later. However, in isolated vesicle preparations, [3H]DTBZ binding and active [3H]DA uptake were markedly reduced (>70%) at 1 day. These observations indicate that vesicle function is compromised at an early time point after exposure to neurotoxic insult. Furthermore, the changes in [H]DTBZ binding in homogenates may not be a sensitive indicator of early damage to synaptic vesicles, although homogenate binding reliably identifies a loss of VMAT2 at later times.lld:pubmed
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pubmed-article:10800969pubmed:authorpubmed-author:SonsallaP KPKlld:pubmed
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pubmed-article:10800969pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:10800969pubmed:articleTitleAnalysis of VMAT2 binding after methamphetamine or MPTP treatment: disparity between homogenates and vesicle preparations.lld:pubmed
pubmed-article:10800969pubmed:affiliationDepartment of Neurology, University of Medicine and Dentistry of New Jersey-Robert Wood Johnson Medical School, Piscataway, 08854, USA.lld:pubmed
pubmed-article:10800969pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:10800969pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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