Dopamine transporter glycosylation correlates with the vulnerability of midbrain dopaminergic cells in Parkinson's disease

Neurobiol Dis. 2009 Dec;36(3):494-508. doi: 10.1016/j.nbd.2009.09.002. Epub 2009 Sep 17.


The dopamine transporter (DAT) is a membrane glycoprotein responsible for dopamine (DA) uptake, which has been involved in the degeneration of DA cells in Parkinson's disease (PD). Given that DAT activity depends on its glycosylation status and membrane expression, and that not all midbrain DA cells show the same susceptibility to degeneration in PD, we have investigated a possible relationship between DAT glycosylation and function and the differential vulnerability of DA cells. Glycosylated DAT expression, DA uptake, and DAT V(max) were significantly higher in terminals of nigrostriatal neurons than in those of mesolimbic neurons. No differences were found in non-glycosylated DAT expression and DAT K(m), and DA uptake differences disappeared after deglycosylation of nigrostriatal synaptosomes. The expression pattern of glycosylated DAT in the human midbrain and striatum showed a close anatomical relationship with DA degeneration in parkinsonian patients. This relationship was confirmed in rodent and monkey models of PD, and in HEK cells expressing the wild-type and a partially deglycosylated DAT form. These results strongly suggest that DAT glycosylation is involved in the differential vulnerability of midbrain DA cells in PD.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Animals
  • Corpus Striatum / metabolism
  • Disease Models, Animal
  • Dopamine / metabolism*
  • Dopamine Plasma Membrane Transport Proteins / metabolism*
  • Female
  • Glycosylation
  • Humans
  • Macaca fascicularis
  • Male
  • Mesencephalon / metabolism*
  • Mice
  • Mice, Inbred C57BL
  • Middle Aged
  • Neurons / metabolism*
  • Parkinson Disease / metabolism*
  • Rats
  • Rats, Sprague-Dawley
  • Species Specificity


  • Dopamine Plasma Membrane Transport Proteins
  • Dopamine