Cytokines and soluble IL-4 in patients with acute optic neuritis and multiple sclerosis

Area of Science:

• Neuroimmunology
• Inflammatory Diseases
• Autoimmune Disorders

Background:

• Multiple Sclerosis (MS) is a complex autoimmune disease affecting the central nervous system.
• Optic Neuritis (ON) can be an initial presentation of MS or occur independently.
• Understanding the immunological differences between MS subtypes is crucial for diagnosis and treatment.

Purpose of the Study:

• To compare cerebrospinal fluid (CSF) and plasma cytokine profiles in patients with different forms of MS and optic neuritis.
• To investigate the role of specific cytokines and receptors in the pathogenesis of MS and ON.
• To differentiate immunological characteristics between idiopathic ON, ON in MS, and other MS attack forms.

Main Methods:

• Enzyme-linked immunosorbent assay (ELISA) was used to measure CSF and plasma concentrations of various cytokines and receptors.
• Analyzed 12 patients each in four groups: acute idiopathic ON, ON with MS, other MS attacks, and neurological controls.
• Included measurements for interleukins (IL)-1α, IL-1β, IL-2, IL-4, IL-6, IL-10, tumor necrosis factor (TNF)-α, TNF-β, interferon (IFN)-γ, IL-1 receptor antagonist, and soluble IL-4 receptor (sIL-4r).

Main Results:

• CSF concentrations of IL-1β, IL-2, and IFN-γ were significantly different across patient groups, highest in non-ON MS attacks.
• TNF-β was exclusively detected in CSF of neurological control subjects.
• Elevated plasma sIL-4r was observed in patients with non-ON MS attacks.

Conclusions:

• Increased CSF IL-1β, IL-2, IFN-γ, and plasma sIL-4r in non-ON MS attacks support an autoimmune basis with T-helper type 1-like cell activation.
• Immunological profiles suggest that idiopathic ON and ON associated with MS may differ from other MS attack forms.
• These findings highlight distinct inflammatory pathways in different MS presentations.