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Reduced MPTP neurotoxicity in striatum of the mutant mouse tottering
Author(s) -
Kilbourn Michael R.,
Sherman Phillip,
Abbott Louise C.
Publication year - 1998
Publication title -
synapse
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.809
H-Index - 106
eISSN - 1098-2396
pISSN - 0887-4476
DOI - 10.1002/(sici)1098-2396(199810)30:2<205::aid-syn10>3.0.co;2-0
Subject(s) - mptp , chemistry , vesicular monoamine transporter , dopaminergic , striatum , dopamine , vesicular monoamine transporter 2 , neurotoxin , endocrinology , medicine , neurotoxicity , monoamine neurotransmitter , monoaminergic , toxicity , dopamine transporter , biology , biochemistry , serotonin , receptor , organic chemistry
The effects of MPTP treatment (4 × 10 mg/kg, 2‐h intervals) on in vivo striatal binding of (+)‐α‐[ 3 H]dihydrotetrabenazine ((+)‐[ 3 H]DTBZ) to the vesicular monoamine transporter type 2 (VMAT2) were examined in wild type ( +,+ ) and tottering ( tg/tg ) mice of the C57BL/6J strain. The tottering mutant has been previously characterized as having hyperinnervation of noradrenergic terminals in the brain, with increased concentrations of norepinephrine and increased numbers of VMAT2 binding sites. In wild‐type mice, MPTP caused a significant decrease in specific striatal (+)‐[ 3 H]DTBZ binding in both males (‐71%) and females (‐57%), consistent with dopaminergic terminal losses. In the tottering mice, the neurotoxic effects of MPTP were diminished, with smaller losses of (+)‐[ 3 H]DTBZ binding observed both in males (‐45%) and females (‐26%). These results are consistent with the hypothesis that vesicular storage (as a result of hyperinnervation) offers neuroprotection toward MPTP toxicity, although the confounding effects of increases in norepinephrine concentrations or changes in calcium ion channel function (both also characteristics of the tottering mutant) cannot be ruled out. The tottering mutant does, however, offer another animal model to examine the biochemical features responsible for MPTP toxicity. Synapse 30:205–210, 1998. © 1998 Wiley‐Liss, Inc.