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Serum pro‐inflammatory and anti‐inflammatory cytokines and the pathogenesis of experimental autoimmune encephalomyelitis

Experimental autoimmune encephalomyelitis (EAE) as an experimental model of multiple sclerosis (MS) is characterized by demyelination, infiltration of inflammatory cells into the nervous system and dysregulation of serum inflammatory cytokines. We investigated the correlation of serum cytokines and other inflammatory markers with the EAE pathogenesis. After EAE induction, the levels of different serum cytokine/inflammatory mediators were measured. Furthermore, motor functions, myelination, and lymphocyte infiltration in EAE mice were also assessed. Our results revealed that the serum concentrations of T‐helper 1 (Th1) and Th17 cytokines, interleukin (IL)‐6, IL‐1β, IL‐1α and prostaglandin E2 in EAE mice were significantly higher than controls. The ratios of pro‐ to anti‐inflammatory cytokines were different between the EAE and the control group. A statistically significant positive correlation was found between the IL‐6/IL‐10 ratio and the EAE severity, demyelination rate, and lymphocyte infiltration in EAE mice. Results indicate that the profiles of serum pro‐ and anti‐inflammatory cytokines might be useful as biomarkers for monitoring the pathological manifestation of EAE. Furthermore, evaluating the dynamic interplay of serum cytokine levels and the correlation with pathogenic mechanisms of EAE may provide diagnostic and therapeutic insights for MS and some other inflammatory disorders.