Review explores PARP-1 and α-synuclein interactions in Parkinson's disease neuropathology

This publication is a narrative review examining the molecular interactions between PARP-1 (poly(ADP-ribose) polymerase-1) and α-synuclein in the context of Parkinson's disease neuropathology. It synthesizes existing evidence to outline how PARP-1 activation influences α-synuclein through various pathways, including conformational changes, post-transcriptional regulation, and post-translational modifications mediated by oxidative and nitrative stress. The review also describes how α-synuclein may indirectly promote PARP-1-dependent cell death via reactive oxygen species, linking these processes to dopaminergic neuronal vulnerability.

Key findings from the review indicate that PARP-1 activation and α-synuclein aggregation are neuropathological hallmarks of Parkinson's disease, with PARP-1 inducing α-synuclein structural reorganization through poly(ADP-ribose). The authors note that PARP-1 contributes to α-synuclein degradation pathways and is involved in stress conditions from its overactivation, while α-synuclein levels are influenced by these interactions. These mechanisms are presented as contributing factors to disease progression, but no pooled effect sizes or quantitative data are provided, as this is not a meta-analysis.

The review does not report specific limitations, gaps in evidence, or funding conflicts, and it lacks details on study populations, interventions, or safety outcomes. Practice relevance is not addressed, and the evidence is based on observational and preclinical studies, avoiding causal claims. Clinicians should interpret these findings cautiously, as they represent a synthesis of mechanistic insights without direct clinical trial support or therapeutic recommendations.