Hair metal dysregulation in Parkinson’s disease: Implications for diagnosis and gut-brain axis involvement

This study examines the potential of hair metal analysis as a biomarker for Parkinson's disease (PD) by analyzing 60 PD patients and matched controls. It identifies a distinct metal profile in PD patients' hair, with lower levels of iron and copper and higher levels of manganese and arsenic. The study links these metal signatures to diagnostic potential, with copper achieving an AUC of 0.79, and highlights the involvement of the gut-brain axis. Using a mouse model, researchers observed impaired intestinal barrier integrity and altered iron metabolism, suggesting that gastrointestinal dysfunction and gut microbiota dysbiosis may contribute to systemic iron deficiency in PD. The findings underscore the need for further research into gut-mediated iron regulation and the gut-brain axis in PD.