Clinical Phenotypes of Progressive Supranuclear Palsy-The Differences in Interleukin Patterns

Area of Science:

• Neuroscience
• Immunology
• Neurology

Background:

• Progressive supranuclear palsy (PSP) is a tauopathy with distinct clinical phenotypes, primarily PSP with Richardson's syndrome (PSP-RS) and PSP parkinsonism predominant (PSP-P).
• Neuroinflammation is implicated in PSP pathogenesis and neurodegeneration.
• Current understanding of cytokine profiles across different PSP phenotypes remains incomplete.

Purpose of the Study:

• To investigate and compare neuroinflammatory patterns between PSP-RS and PSP-P phenotypes.
• To analyze serum and cerebrospinal fluid (CSF) cytokine levels in PSP patients and healthy controls.

Main Methods:

• Enzyme-linked immunosorbent assay (ELISA) was used to measure serum and CSF concentrations of interleukin-1 beta (IL-1β) and IL-6.
• Study included 12 healthy controls and 24 PSP patients (12 PSP-RS, 12 PSP-P).
• Neutrophil-to-lymphocyte ratio (NLR), platelet-to-lymphocyte ratio (PLR), and CSF total tau levels were assessed.

Main Results:

• Total tau levels in CSF were significantly elevated in both PSP-P and PSP-RS groups compared to controls.
• PSP-RS patients exhibited the lowest serum and CSF interleukin concentrations.
• PSP-P patients and healthy controls showed significantly higher interleukin levels; PSP-RS patients had a correlation between serum IL-6 and PLR.

Conclusions:

• Distinct neuroinflammatory profiles exist between PSP-RS and PSP-P phenotypes.
• Elevated inflammatory activity might play a neuroprotective role or contribute to phenotypic differences in PSP.
• Further research is needed to confirm the causality of observed correlations.