Phase I Study to Evaluate KP405 in Healthy and Parkinson's Disease Patients

This study will explore the safety, pharmacokinetics (PK) and pharmacodynamics (PD) of KP405 as a potential new treatment for Parkinson's disease.

Inclusion Criteria: * Healthy as determined by a responsible physician, based on medical evaluation including medical history, physical examination, concomitant medication, vital signs, 12-lead ECG, cardiac Holter monitoring and clinical laboratory evaluations. * Clinical diagnosis of Parkinson's disease meeting United Kingdom Brain Bank criteria. Exclusion Criteria: * Clinically relevant history of abnormal physical or mental health interfering with the study as determined by medical history and physical examinations obtained during Screening as judged by the Investigator (including \[but not limited to\], neurological, psychiatric, endocrine, cardiovascular, respiratory, gastrointestinal, hepatic, or renal disorder), excluding Parkinson's disease. * Clinically significant, as judged by the Investigator, neurologic disorder (other than Parkinson's disease) including history of stroke or transient ischaemic attack within 12 months of Screening, cognitive impairment, seizure within 5 years of Screening or head trauma with loss of consciousness within 6 months of Screening.