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Multiple sclerosis neuroinflammation represents a significant challenge in managing the cognitive health of patients. Impaired information processing speed (IPS) is among the most common and disabling cognitive deficits observed in this population. While conventional MRI provides insights into focal lesions, it often misses the diffuse glial activation occurring in the normal-appearing white matter (NAWM). Recently, researchers have turned to advanced molecular imaging to bridge this gap.
To investigate this further, a longitudinal study assessed forty-eight people with MS using translocator protein-positron emission tomography (TSPO-PET). This technique measures glial activation via the [¹¹C]PK11195 radioligand. Furthermore, participants underwent magnetic resonance imaging and diffusion tensor imaging alongside the Symbol Digit Modalities Test (SDMT). This test serves as a gold standard for evaluating IPS in clinical settings. Over a median follow-up of 4.9 years, the research team tracked changes in cognitive performance.
The results identified several critical biomarkers of cognitive status. Initially, thalamic glial activation and NAWM radial diffusivity explained a substantial portion of the baseline SDMT variance. Specifically, higher levels of neuroinflammation correlated with slower processing speeds. Moreover, the study found that glial activation in the NAWM was the strongest predictor of future SDMT change. This finding suggests that diffuse inflammation drives long-term cognitive deterioration more than focal lesion volume alone.
Additionally, the researchers developed a predictive model for cognitive decline. By combining lesion rim glial activation and baseline SDMT scores, the model achieved 73% sensitivity and 83% specificity. Consequently, these findings highlight the potential of TSPO-PET as a prognostic tool. Understanding the role of chronic glial activation allows clinicians to better anticipate disease progression. Therefore, targeting diffuse neuroinflammation might offer a new avenue for preserving cognitive function in MS patients.
The SDMT is a brief neuropsychological test that measures the speed of information processing. It requires patients to match symbols with numbers based on a key within a set time limit.
TSPO-PET utilizes radioligands that bind to the translocator protein (TSPO) found on the outer mitochondrial membrane of activated microglia and astrocytes. This allows for the in vivo quantification of glial activation.
NAWM refers to brain tissue that appears healthy on standard MRI scans but may harbor subtle pathological changes, such as diffuse neuroinflammation and microstructural damage.
Disclaimer: This content is for informational and educational purposes only. It is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Refer to the latest local and national guidelines for clinical practice.
References
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