Neuroprotection in Parkinson’s Disease: No More Status Quo

Aim and Objectives

This study aims to evaluate and analyze the concept of neuroprotection in Parkinson’s Disease (PD) by investigating the underlying mechanisms responsible for dopaminergic neuronal death. It explores how these pathological processes contribute to disease progression and identifies potential targets for therapeutic intervention. Apart from deciphering neuroprotection, once considered an elusive goal, to its definition, this study also points out how translational science has contributed to the understanding of not only PD but also other Neurodegenerative disorders, with the turn of the 20^th century.

Materials and Methods

A comprehensive review was conducted focusing on key pathological mechanisms involved in PD, including α-synuclein aggregation, mitochondrial dysfunction, oxidative stress, and neuroinflammation.

Results

The study found that the accumulation of misfolded α-synuclein impairs synaptic and mitochondrial functions, initiating neurodegeneration. Reduced mitochondrial complex activity and defective mitophagy were identified as central causes of mitochondrial impairment. Mitochondrial dysfunction, along with dysregulated iron metabolism, emerged as primary sources of oxidative stress, increasing the susceptibility of dopaminergic neurons. Widespread microglial activation, T-cell infiltration, and elevated pro-inflammatory cytokines were consistently observed. Glutamate-induced excitotoxicity via NMDA receptors, lysosomal dysfunction, and apoptosis were significant contributors to neuronal loss. Genetic mutations in SNCA, LRRK2, PARKIN, PINK1, and GBA were found to exacerbate these pathogenic processes.

Conclusion

The findings underscore that PD results from a multifactorial interplay involving α-synuclein pathology, mitochondrial deficits, oxidative damage, and chronic neuroinflammation. These overlapping mechanisms converge to cause progressive dopaminergic neuron degeneration. Targeting these early molecular events presents an effective approach for neuroprotection and for slowing disease progression, with the aim of preserving neuronal function in Parkinson's disease.