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Serum neurofilament light chain (NfL) is elevated in fibromyalgia patients, indicating neuronal changes. However, NfL levels do not correlate with small fibre pathology or cognitive issues, suggesting it reflects overall disease burden rather than specific nerve damage.

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Area of Science:

  • Neurology
  • Biochemistry
  • Pain Medicine

Background:

  • Fibromyalgia (FM) is a chronic pain condition often associated with central sensitization and small fibre pathology.
  • Neurofilament light chain (NfL) is a biomarker for axonal injury, but its specific role in FM is not well understood.
  • Investigating NfL in FM may offer insights into the underlying neurobiology of the disorder.

Purpose of the Study:

  • To evaluate serum NfL levels in fibromyalgia patients compared to healthy controls.
  • To explore correlations between NfL levels and clinical features, including pain, disability, sleep, and cognitive function.
  • To assess the relationship between NfL levels and small fibre pathology determined by skin biopsy.

Main Methods:

  • An observational case-control study was conducted with 70 FM patients and 55 healthy controls.
  • Serum NfL was quantified using the LUMIPULSE G600II platform.
  • Clinical assessments included validated questionnaires for pain, disability, sleep, and cognitive function (MoCA, executive function battery); 40 patients had skin biopsies for intraepidermal nerve fibre density (IENFD) assessment.

Main Results:

  • Fibromyalgia patients exhibited significantly higher serum NfL levels than controls, irrespective of age.
  • Serum NfL levels correlated positively with age in both groups but showed no correlation with IENFD or skin biopsy findings in FM patients.
  • NfL levels in FM patients were not associated with disease duration, pain intensity, sleep quality, or cognitive performance, but did show a positive correlation with disability (FIQ score).

Conclusions:

  • Elevated serum NfL in fibromyalgia suggests a neurogenic component to the disorder.
  • Serum NfL is not directly linked to small fibre pathology or cognitive impairment in FM.
  • NfL may serve as a potential biomarker for neuronal stress or disease burden in chronic pain conditions like fibromyalgia, though not specific for peripheral nerve damage.