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Serum Neurofilament Light-Chain Levels in Essential Tremor: A Replication Study
Elan D Louis1,2, Vibhash D Sharma1,2, Ihab Hajjar1,2
1Department of Neurology, University of Texas Southwestern, Dallas, Texas, USA.
Neuro-Degenerative Diseases
|December 3, 2024
Summary
Essential tremor (ET) shows elevated serum neurofilament light (NfL) levels, indicating neuronal damage. This finding, consistent across multiple studies, suggests NfL as a potential biomarker for ET.
Area of Science:
- Neurology
- Biomarkers
- Neuroscience
Background:
- Essential tremor (ET) is a common neurological disorder lacking clinical biomarkers.
- Neurofilament light (NfL) is a marker for neuronal damage in various neurological conditions.
- Previous studies on NfL in ET have yielded inconsistent results.
Purpose of the Study:
- To investigate serum NfL levels in essential tremor.
- To determine if NfL can serve as a biomarker for neuronal damage in ET.
Main Methods:
- Serum NfL levels were measured using the Simoa® platform (NF-Light™ kit).
- Forty ET cases were compared to two control groups (n=41 and n=185).
- Total tremor score assessed action tremor severity.
Main Results:
- Serum NfL levels were significantly higher in ET cases compared to controls in both groups (p < 0.001).
- Higher serum NfL levels were associated with ET diagnosis (p = 0.03) and older age (p < 0.001).
- No correlation was found between serum NfL levels and tremor severity in ET patients (p = 0.63).
Conclusions:
- This study reinforces elevated serum NfL levels in ET patients.
- Converging evidence suggests increased serum NfL is characteristic of ET.
- Elevated NfL levels provide further evidence of underlying neuronal damage in essential tremor.
