High production of interleukin-10 and interferon-γ in influenza-associated MERS in the early phase

Area of Science:

• Neuroscience
• Immunology
• Infectious Diseases

Background:

• Mild encephalitis/encephalopathy with a reversible splenial lesion (MERS) presents with neurological symptoms inconsistent with lesion location.
• The underlying mechanisms driving MERS lesion specificity remain poorly understood.
• Influenza infection is a known cause of encephalopathy, but MERS pathogenesis is distinct.

Observation:

• This study analyzed cytokine profiles in cerebrospinal fluid (CSF) and serum from a child with MERS during influenza infection.
• Cytokine levels were compared to those from patients with severe influenza-associated encephalopathy.
• Interleukin (IL)-1β, a pro-convulsant cytokine, was not elevated in the MERS case.

Findings:

• Elevated levels of inhibitory cytokines, specifically IL-10 and IFN-γ, were observed in the early CSF phase of MERS.
• Compared to other encephalopathy cases, the overall cytokine elevation in this MERS patient was mild.
• Absence of IL-1β elevation suggests a different pathway than convulsive encephalopathy.

Implications:

• High levels of inhibitory cytokines (IL-10, IFN-γ) may play a role in localizing MERS lesions.
• These cytokines might contribute to the favorable prognosis and prevention of neurological sequelae in MERS.
• Understanding cytokine dynamics in MERS could inform targeted therapeutic strategies for influenza-associated neurological complications.