Febrile Seizures and Epileptogenesis Mechanisms

Febrile seizures represent the most common convulsive events in early childhood, provoked by elevated body temperature in the absence of central nervous system infection. While most episodes are benign and self-limiting, a subset of prolonged or recurrent febrile seizures can initiate a cascade of molecular and cellular alterations that lower seizure threshold and predispose to chronic epilepsy. Key mechanisms include acute neuroinflammatory responses driven by cytokines such as interleukin-1β, rapid remodelling of glutamatergic synaptic receptors, and aberrant synaptogenesis mediated by extracellular matrix proteins. Pro-epileptogenic processes evolve through latent phases involving altered gene and microRNA expression, neuroimmune modulation and dendritic reorganisation, eventually culminating in spontaneous recurrent seizures and cognitive impairments. Understanding these interconnected pathways has global significance for paediatric neurology, offering opportunities to identify early biomarkers and to develop targeted interventions—ranging from immunomodulatory agents to novel inhalational therapies—to prevent progression from a single febrile event to lifelong epilepsy.

Research from Nature Portfolio

Temporal profiling of transcriptomic and microRNA changes in the hippocampal CA3 region of rats exposed to hyperthermic insult has revealed distinct adaptive responses in subjects that resist versus those that develop seizures. Invariant inflammatory and neurogenesis-related gene networks distinguished the two groups across acute, latent and chronic phases, pinpointing candidate molecules for therapeutic modulation. In parallel, studies of prolonged febrile seizures have demonstrated that a transient surge in interleukin-1β triggers long-lasting upregulation of endocannabinoid signalling, which in turn heightens adult seizure susceptibility. Interruption of the interleukin-1 receptor pathway within a critical post-insult window prevents this maladaptive plasticity, highlighting a viable target for early-life intervention to disrupt epileptogenesis.

Febrile Seizures and Epileptogenesis Mechanisms publication trend

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

Technical terms

Febrile seizure: A convulsive event in infancy or early childhood precipitated by fever without evidence of central infection.

Epileptogenesis: The progressive transformation of a normal brain into one capable of generating spontaneous recurrent seizures.

Synaptogenesis: The formation and strengthening of synaptic contacts between neurons during development or following injury.

Transcriptomics: The large-scale study of RNA transcripts produced by the genome, revealing gene expression changes.

MicroRNA: Short non-coding RNAs that post-transcriptionally regulate gene expression and modulate cellular responses.

Thrombospondin-1: An extracellular matrix glycoprotein that promotes synapse formation and influences neuronal network plasticity.

References

1. Transcriptomic analysis reveals distinct adaptive molecular mechanism in the hippocampal CA3 from rats susceptible or not-susceptible to hyperthermia-induced seizures. Scientific Reports (2023).
2. Transient increase of interleukin-1β after prolonged febrile seizures promotes adult epileptogenesis through long-lasting upregulating endocannabinoid signaling. Scientific Reports (2016).
3. Increased thrombospondin-1 levels contribute to epileptic susceptibility in neonatal hyperthermia without seizures via altered synaptogenesis. Cell Death Discovery (2024).
4. Animal Models of Febrile Seizures: Limitations and Recent Advances in the Field. Cells (2024).
5. Xenon inhalation attenuates neuronal injury and prevents epilepsy in febrile seizure Sprague-Dawley pups. Frontiers in Cellular Neuroscience (2023).