Single-cell elderly blood-CSF atlas implicates peripherally influenced immune dysregulation in normal pressure...

Area of Science:

• Neuroscience
• Immunology
• Genomics

Background:

• Idiopathic normal pressure hydrocephalus (iNPH) is a neurological disorder affecting gait, cognition, and bladder control.
• The underlying pathophysiology of iNPH, particularly the role of immune responses, remains incompletely understood.

Purpose of the Study:

• To create a comprehensive single-cell RNA sequencing atlas of peripheral blood and cerebrospinal fluid (CSF) from iNPH patients.
• To investigate potential immune dysregulation and cellular changes associated with iNPH and cognitive function.

Main Methods:

• Generation of a single-cell RNA sequencing atlas comprising 140,207 transcriptomes from peripheral blood and ventricular CSF of iNPH patients.
• Analysis of cellular populations and gene expression profiles to identify alterations in immune cells and neuroglial cells.

Main Results:

• Identification of proinflammatory alterations in monocytes from both peripheral blood and CSF of iNPH patients.
• Correlation of these proinflammatory changes with lower baseline cognitive function in iNPH patients.
• Discovery of specific CSF cell populations suggestive of degenerating neuroglial cells sloughing from the periventricular region.

Conclusions:

• The study suggests a potential role for immune dysregulation in the pathogenesis of iNPH.
• Proinflammatory processes in blood and CSF monocytes may be linked to cognitive decline in iNPH.
• The findings provide novel insights into the cellular and molecular mechanisms underlying iNPH.