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Related Experiment Videos

Dopaminergic brain system in the quaking mutant mouse

E M Nikulina1, J A Skrinskaya, D F Avgustinovich

  • 1Institute of Cytology and Genetics, Siberian Division of the Russian Academy of Sciences, Novosibirsk.

Pharmacology, Biochemistry, and Behavior
|March 1, 1995
PubMed
Summary

Quaking mice (qk/qk) exhibit altered brain dopamine systems, with enhanced metabolism and modified D1/D2 receptor characteristics, potentially explaining their neurological and behavioral deficits.

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Area of Science:

  • Neuroscience
  • Genetics
  • Pharmacology

Background:

  • Quaking mice (qk/qk) are autosomal recessive mutants exhibiting central nervous system dysmyelination.
  • These mice display abnormal locomotion and tremors, indicative of neurological dysfunction.

Purpose of the Study:

  • To investigate alterations in the brain dopaminergic system of quaking mice.
  • To correlate these neurochemical changes with the observed behavioral phenotype.

Main Methods:

  • Analysis of dopamine metabolism via metabolite content (homovanillic acid, 3,4-dihydroxy-phenylacetic acid).
  • Radioligand binding assays using [3H]-SCH 23390 (D1) and [3H]-spiperone (D2) to assess receptor density and affinity.
  • Pharmacological challenge with D1 (SKF 38393) and D2 (LY 171555) receptor agonists to evaluate receptor sensitivity and behavioral responses.

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Main Results:

  • Enhanced dopamine metabolism in nigrostriatal and mesolimbic systems of qk/qk mice.
  • Increased D2 receptor density and decreased affinity in the striatum of mutants.
  • Altered D1 and D2 receptor sensitivity, with qk/qk mice showing reduced response to D2 agonists and exaggerated response to D1 agonists.

Conclusions:

  • The quaking mouse model presents significant dysregulation in its brain dopaminergic system.
  • These dopaminergic alterations are likely responsible for the characteristic neurological and behavioral phenotype of the qk/qk mutation.