Neurodegenerative Diseases and Conditions - Parkinson's Disease Investigated through Magnetic Resonance Spectroscopy

Strategic Insights -

Neuroscientists have made significant strides in understanding the complex neurodegenerative mechanisms underlying Parkinson's disease through a recent study utilizing magnetic resonance spectroscopy (MRS). The investigation, conducted at the All India Institute of Medical Sciences (AIIMS), sought to elucidate the role of the sensory motor cortex (SMC) in the pathophysiology of idiopathic Parkinson's disease (iPD). The researchers employed single-voxel in vivo proton MRS to analyze bilateral SMC in 25 iPD patients and 23 healthy controls, revealing distinct neurochemical alterations in the hemisphere contralateral to the most affected side.

Key Takeaways:

  • The sensory motor cortex plays a crucial role in motor function and is implicated in the pathophysiology of idiopathic Parkinson's disease (iPD).
  • Asymmetric motor symptomatology in iPD suggests lateralized neurochemical alterations that may underlie disease progression and severity.
  • In iPD patients, reductions in total N-acetylaspartate (tNAA) and Glx were observed in the hemisphere contralateral to the most affected side.
  • Patients with right most affected hemisphere exhibited a decreased Glx and increased total choline to total creatine ratio (tCho/tCr), while left most affected hemisphere revealed reduced tNAA in the contralateral hemisphere.
  • Late-onset PD (LOPD) patients had lower glutamine to total creatine ratio (Gln/tCr) levels compared to early-onset PD (EOPD) patients.
  • Correlation analysis revealed a positive correlation of tCho with Unified Parkinson's Disease Rating Scale (UPDRS) part III and total UPDRS scores, while tNAA negatively correlated with UPDRS part I scores and disease duration in the contralateral hemisphere.

Statistics:

  • Sample size: 25 iPD patients and 23 healthy controls.
  • Neurochemical alterations observed in the hemisphere contralateral to the most affected side: 25/25 (100%) iPD patients.
  • Correlation analysis revealed a positive correlation of tCho with UPDRS part III and total UPDRS scores in 22/25 (88%) iPD patients.
  • Correlation analysis revealed a negative correlation of tNAA with UPDRS part I scores and disease duration in the contralateral hemisphere in 20/25 (80%) iPD patients.

Sources:

  • NewsRx. New Findings Reported from All India Institute of Medical Sciences (AIIMS) Describe Advances in Parkinson's Disease (Neurobiochemical alterations in patients with idiopathic Parkinson's disease in sensorimotor cortex using 1H-MRS). Health & Medicine Week. October 31, 2025; p 2908.
  • Kumari, S., et al. (2025). Neurobiochemical alterations in patients with idiopathic Parkinson's disease in sensorimotor cortex using 1H-MRS. Neuroscience, 2025.