Effect of AdGDNF on dopaminergic neurotransmission in the striatum of 6-OHDA-treated rats

A. D. Smith*, D. A. Kozlowski, M. C. Bohn, M. J. Zigmond

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

We have previously observed that the delivery of an adenoviral vector encoding for glial cell line-derived neurotrophic factor (AdGDNF) into the substantia nigra (SN) 7 days after intrastriatal administration of 6-hydroxydopamine (6-OHDA) protects dopamine (DA)-dependent behaviors, tyrosine hydroxylase immunoreactive (TH+) cells in SN, and amphetamine-induced c-fos induction in striatum. In the present study, we sought to determine if the behavioral protection observed in 6-OHDA-treated rats receiving AdGDNF was associated with an increase in DA availability in the striatum as measured by microdialysis. Rats received intrastriatal 6-OHDA (16 μg/2.8 μl) or vehicle followed 7 days later by intranigral AdGDNF (3.2 × 107 pfu/2 μl), AdLacZ (3.2 × 107 pfu/2 μl), or phosphate buffered saline (PBS). Three weeks later, microdialysis samples were collected from the same striatal region under basal conditions, following KCl (100 mM) or amphetamine (250 μM) administered via the striatal microdialysis probe, or amphetamine administered systemically (6.8 mg/kg i.p). Animals given 6-OHDA followed by either PBS or AdLacZ showed a decrease in basal extracellular striatal DA levels to 24% of control. In contrast, basal extracellular DA in 6-OHDA-lesioned rats with a nigral injection of AdGDNF was almost 3-fold higher than 6-OHDA-vehicle treated animals, 65% of control DA levels. Moreover, although KCl and amphetamine produced no increase in striatal DA release in 6-OHDA-treated rats that subsequently were given either PBS or AdLacZ, these manipulations increased DA levels significantly in 6-OHDA-treated rats later given AdGDNF. Thus, DA neurotransmission within the striatum of 6-OHDA treated rats appears to be enhanced by increased expression of GDNF in the nigra.

Original languageEnglish (US)
Pages (from-to)420-426
Number of pages7
JournalExperimental Neurology
Volume193
Issue number2
DOIs
StatePublished - Jun 2005

Keywords

  • 6-hydroxydopamine
  • Adenoviral vector
  • Dopamine
  • Gene therapy
  • Glial cell line-derived neurotrophic factor
  • Microdialysis
  • Parkinson's disease

ASJC Scopus subject areas

  • Neurology
  • Developmental Neuroscience

Fingerprint

Dive into the research topics of 'Effect of AdGDNF on dopaminergic neurotransmission in the striatum of 6-OHDA-treated rats'. Together they form a unique fingerprint.

Cite this