Selective gray matter damage in neuropsychiatric lupus

Area of Science:

• Neuroimaging
• Rheumatology
• Neurology

Background:

• Systemic lupus erythematosus (SLE) can affect the central nervous system, leading to neuropsychiatric symptoms (NPSLE).
• Magnetization transfer imaging (MTI) has shown brain parenchyma damage in NPSLE patients, but the specific location of these abnormalities remains unclear.
• Previous magnetic resonance imaging (MRI) studies have not identified focal lesions explaining these symptoms.

Purpose of the Study:

• To investigate the distribution of MTI abnormalities in gray matter (GM) and white matter (WM) in SLE patients with a history of NP symptoms.
• To assess whether MTI can detect abnormalities in the absence of focal MRI findings.

Main Methods:

• MTI was performed on 24 female SLE patients with NP symptoms and 24 healthy female controls.
• Magnetization transfer ratio (MTR) maps were generated for GM and WM separately.
• Histogram parameters (peak location, peak height, mean MTR) were analyzed using univariate and multivariate analyses.

Main Results:

• NPSLE patients showed significantly reduced GM peak height and mean MTR compared to controls.
• No significant differences in MTR parameters were observed in the white matter (WM).
• These MTI abnormalities in GM were detected despite the absence of focal MRI evidence.

Conclusions:

• This study is the first to demonstrate, using MTI, that GM is particularly affected in SLE patients with NP symptoms and no focal MRI abnormalities.
• The findings support the hypothesis that neuronal injury in GM may underlie central nervous system manifestations in NPSLE.
• MTI is a valuable tool for detecting subtle brain changes in NPSLE.