Here's a good article about new targets, in PDF form. Let me know if you can't see it:
Novel pharmacological targets for the treatment of Parkinson's disease
AH Schapira, E Bezard, J Brotchie, F Calon … - Nature Reviews Drug …, 2006
http://www1.tu-darmstadt.de/fb/ch/Fa...en/nrd2087.pdf