Lesions known as Lewy bodies (LBs) and Lewy neurites (LNs) characterise brains of Parkinson’s disease (PD) patients. Intracellular aggregation of a-synuclein (a-syn) appears to play a key role in the generation of LBs andLNs. Such aggregation in the presence of redox metals may initiate Fenton reaction-mediated generation of reactive oxygen species (ROS). ROS thus generated may result in cytotoxic mechanisms such as the induction of DNA single-strand breaks.