NMDA alters rotenone toxicity in rat substantia nigra zona compacta and ventral tegmental area dopamine neurons

Adam C. Munhall, Yan Na Wu, John Belknap, Charles K. Meshul, Steven Johnson

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Previous patch-clamp studies by our laboratory showed that acute exposure to the pesticide rotenone augments inward currents evoked by N-methyl-d-aspartate (NMDA) in substantia nigra zona compacta (SNC) dopamine neurons in slices of rat brain. The present experiments were done to search for histological evidence of increased neurotoxicity produced by combined rotenone and NMDA treatments. In horizontal slices of rat midbrain, we found that a 30. min superfusion with 100. nM rotenone caused significant injury to tyrosine hydroxylase (TH)-positive proximal dendrites in dorsal and ventral regions of the SNC and ventral tegmental area (VTA). Moreover, treatment with 100. μM NMDA potentiated rotenone toxicity. In contrast, treatment with 30. μM NMDA protected against rotenone-induced injury to dendrites in the ventral SNC and ventral VTA. Interestingly, treatment with 30. μM NMDA-alone produced an apparent increase in proximal dendrite scores in ventral SNC and dorsal VTA. We conclude that NMDA has concentration-dependent actions on rotenone toxicity that differ according to regional subtype of dopamine neuron.

Original languageEnglish (US)
Pages (from-to)429-435
Number of pages7
JournalNeuroToxicology
Volume33
Issue number3
DOIs
StatePublished - Jun 2012

Fingerprint

Rotenone
Ventral Tegmental Area
Dopaminergic Neurons
Herpes Zoster
Aspartic Acid
Neurons
Toxicity
Rats
Dopamine
Dendrites
Clamping devices
Wounds and Injuries
Tyrosine 3-Monooxygenase
Mesencephalon
Pesticides
Pars Compacta
Brain

Keywords

  • Dendrite
  • Histology
  • N-methyl-d-aspartate
  • Rotenone
  • Substantia nigra
  • Ventral tegmental area

ASJC Scopus subject areas

  • Neuroscience(all)
  • Toxicology

Cite this

NMDA alters rotenone toxicity in rat substantia nigra zona compacta and ventral tegmental area dopamine neurons. / Munhall, Adam C.; Wu, Yan Na; Belknap, John; Meshul, Charles K.; Johnson, Steven.

In: NeuroToxicology, Vol. 33, No. 3, 06.2012, p. 429-435.

Research output: Contribution to journalArticle

Munhall, Adam C. ; Wu, Yan Na ; Belknap, John ; Meshul, Charles K. ; Johnson, Steven. / NMDA alters rotenone toxicity in rat substantia nigra zona compacta and ventral tegmental area dopamine neurons. In: NeuroToxicology. 2012 ; Vol. 33, No. 3. pp. 429-435.
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