Serotonin Neuron Loss and Nonmotor Symptoms Continue in Parkinson's Patients Treated with Dopamine Grafts
Cell therapy studies in patients with Parkinson's disease (PD) have been confined to intrastriatal transplantation of dopamine-rich fetal mesencephalic tissue in efforts to improve motor performance. Although some PD patients receiving the dopamine-rich grafts showed improvements in motor symptoms due to replacement of dopaminergic neurons, they still suffered from nonmotor symptoms including depr