Inflammatory Cytokines in Febrile Seizures

Febrile seizures represent the most frequent convulsive events in early childhood, occurring in 2–5 per cent of children under five years of age. The pathogenesis of these seizures is closely linked to the host inflammatory response to febrile illness. Pro-inflammatory cytokines such as interleukin-1β (IL-1β), interleukin-6 (IL-6) and tumour necrosis factor-α (TNF-α) are instrumental in generating fever and lowering the seizure threshold via effects on neuronal excitability, blood–brain barrier permeability and glial activation. Concurrently, anti-inflammatory mediators, including interleukin-10 (IL-10) and the interleukin-1 receptor antagonist (IL-1Ra), serve to dampen excessive inflammation and may limit seizure propagation or duration. Emerging evidence suggests that genetic polymorphisms affecting cytokine expression further modulate susceptibility, severity and recurrence risk. A balanced interplay between pro- and anti-inflammatory pathways appears critical: an exaggerated or prolonged inflammatory state may predispose susceptible children to complex or recurrent febrile seizures, whereas effective anti-inflammatory compensation may confer resilience. Understanding these molecular mechanisms has global significance for risk stratification, the development of biomarker panels and the pursuit of targeted anti-cytokine therapies to prevent febrile seizure episodes and potential long-term neurological sequelae.

Research from Nature Portfolio

Recent studies have explored simple haematological indices as surrogates for cytokine activity. One investigation examined neutrophil-to-lymphocyte ratio (NLR) and mean platelet volume/platelet count ratio (MPR) in a large cohort of febrile children with and without seizures. Elevated NLR and MPR levels were found to correlate independently with febrile seizure risk, and a synergistic interaction between these markers further amplified susceptibility. Notably, children with complex febrile seizures exhibited higher NLR and lower mean platelet volume than those with simple events, supporting the utility of routine blood-count parameters as accessible inflammatory biomarkers in clinical practice.

Inflammatory Cytokines in Febrile Seizures publication trend

The graph below shows the total number of articles in inflammatory cytokines in febrile seizures across all publications each year (not limited to Nature Index journals).

Technical terms

Cytokine: A low-molecular-weight protein secreted by immune cells that mediates intercellular communication in inflammation and immunity.

Pro-inflammatory cytokine: A mediator that promotes fever, tissue inflammation and activation of immune effector functions.

Anti-inflammatory cytokine: A mediator that counteracts pro-inflammatory signals, limits tissue damage and resolves inflammation.

Neutrophil-to-lymphocyte ratio (NLR): A calculated index from peripheral blood counts reflecting systemic inflammatory status.

Mean platelet volume/platelet ratio (MPR): A metric combining platelet size and count to infer platelet activation and inflammatory load.

Interleukin-1 receptor antagonist (IL-1Ra): A naturally occurring inhibitor of IL-1 signalling that mitigates excessive inflammatory responses.

References

1. Inflammatory Processes, Febrile Seizures, and Subsequent Epileptogenesis. Epilepsy Currents (2014).
2. The role of Mean Platelet Volume/platelet count Ratio and Neutrophil to Lymphocyte Ratio on the risk of Febrile Seizure. Scientific Reports (2018).
3. Recurrent febrile seizures and serum cytokines: a controlled follow-up study. Pediatric Research (2022).
4. Exploring the Involvement of Cytokines in Pediatric Patients Afflicted by Simple Febrile Seizures: A Case-Control Study. Cureus (2023).