Pharmacokinetics and bioactivity of glial cell line-derived factor (GDNF) and neurturin (NTN) infused into the rat brain

Neuropharmacology. 2010 Jun;58(7):1114-21. doi: 10.1016/j.neuropharm.2010.02.002. Epub 2010 Feb 11.


Convection-enhanced delivery (CED) of GDNF and NTN was employed to determine the tissue clearance of these factors from the rat striatum and the response of the dopaminergic system to a single infusion. Two doses of GDNF (15 and 3 microg) and NTN (10 microg and 2 microg) were infused into the rat striatum. Animals were euthanized 3, 7, 14, 21, and 28 days post-infusion. Brains were processed for ELISA, HPLC, and immunohistochemistry (IHC). Both doses of the infused GDNF resulted in a sharp increase in striatal GDNF levels followed by a rapid decrease between day 3 and 7. Interestingly, IHC revealed GDNF in the septum and the base of the brain 14 days after GDNF administration. Dopamine (DA) turnover was significantly increased in a dose-dependent manner for more than 7 days after a single GDNF infusion. NTN persisted in the brain for at least two weeks longer than GDNF. It also had more persistent effects on DA turnover, probably due to its precipitation in the brain at neutral pH after infusion. Our data suggest that daily or continuous dosing may not be necessary for delivering growth factors into the CNS.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Brain / drug effects
  • Brain / metabolism*
  • Chromatography, High Pressure Liquid
  • Corpus Striatum / drug effects
  • Corpus Striatum / metabolism
  • Dopamine / metabolism*
  • Dose-Response Relationship, Drug
  • Enzyme-Linked Immunosorbent Assay
  • Glial Cell Line-Derived Neurotrophic Factor / administration & dosage
  • Glial Cell Line-Derived Neurotrophic Factor / metabolism
  • Glial Cell Line-Derived Neurotrophic Factor / pharmacokinetics*
  • Glial Cell Line-Derived Neurotrophic Factor / pharmacology*
  • Immunohistochemistry
  • Male
  • Neurturin / administration & dosage
  • Neurturin / metabolism
  • Neurturin / pharmacokinetics*
  • Neurturin / pharmacology*
  • Rats
  • Rats, Sprague-Dawley
  • Time Factors


  • Glial Cell Line-Derived Neurotrophic Factor
  • Neurturin
  • Nrtn protein, rat
  • Dopamine