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Distinct T Cell Dysregulation Reflects Disease Severity and Progression in Infantile Epileptic Spasms Syndrome and
Leechung Chang1, Yeo-Jin Jeong1,2, Haeun Chang3
1Department of Microbiology and Immunology, Yonsei University College of Medicine, Seoul 03722, Korea.
Insights
Developmental and epileptic encephalopathies (DEEs) show distinct immune cell differences. IESS patients have fewer naive T cells, while LGS patients exhibit Treg dysfunction and more activated CD8+ T cells, impacting disease severity.
Area of Science:
- Immunology
- Pediatric Neurology
- Genetics
Background:
- Developmental and epileptic encephalopathies (DEEs), including Infantile Epileptic Spasms Syndrome (IESS) and Lennox-Gastaut Syndrome (LGS), are severe pediatric neurological disorders.
- These conditions involve significant developmental delays and drug-resistant epilepsy, with limited understanding of their immunological underpinnings.
- Current steroid therapies offer some benefits, but targeted treatments are lacking due to poorly understood immune mechanisms.
Purpose of the Study:
- To investigate the distinct immune profiles in patients with IESS and LGS.
- To identify potential immune biomarkers associated with disease severity and progression in DEEs.
- To explore the role of immune dysregulation in the pathogenesis of these severe pediatric epilepsies.
Main Methods:
- Comprehensive immune profiling was conducted using multi-parametric flow cytometry.
- Peripheral blood mononuclear cells (PBMCs) were analyzed from patients with IESS (n=25) and LGS (n=9).
- Immune cell populations and functions were compared against age-matched healthy controls (n=54).
Main Results:
- IESS patients showed reduced naive CD4+ T cells, an altered CD4/CD8 ratio, and diminished TNFα production.
- LGS patients displayed increased central memory CD4+ T cells, significant Treg dysfunction, and heightened CD8+ T cell activation.
- Elevated activated CD8+ T cells in IESS correlated with clinical severity and showed increased viral peptide responsiveness, suggesting a role for prior infections.
Conclusions:
- Distinct immune signatures characterize IESS and LGS, highlighting specific T cell subset alterations and functional deficits.
- Immune dysregulation patterns correlate with disease severity and may indicate pathways for progression, potentially influenced by viral infections.
- These identified immune signatures hold potential as biomarkers for DEEs, warranting further investigation into immune-targeted therapeutic strategies.
Abstract:
Developmental and epileptic encephalopathies (DEEs), including Infantile Epileptic Spasms Syndrome (IESS) and Lennox-Gastaut Syndrome (LGS), are severe pediatric conditions characterized by profound developmental delays and treatment-resistant epilepsy. Although steroid therapies provide some clinical benefits, the underlying immunological mechanisms remain poorly understood. In this study, we performed comprehensive immune profiling using multi-parametric flow cytometry on PBMCs from IESS (n=25) and LGS (n=9) patients, comparing them with age-matched healthy controls (n=54). Our findings identified distinct patterns of immune dysregulation: IESS patients exhibited reduced naïve CD4+ T cells, an altered CD4/CD8 ratio, and diminished TNFα production in CD4+ T cells. Conversely, LGS patients demonstrated an increase in central memory CD4+ T cells, marked dysfunction of Tregs, and heightened activation of CD8+ T cells. Notably, elevated activated CD8+ T cells in IESS patients correlated significantly with clinical severity and demonstrated enhanced responsiveness to viral peptides, suggesting prior viral infections may exacerbate disease progression. Collectively, our findings demonstrate distinct immune signatures associated with disease severity and progression in DEE, suggesting their potential utility as biomarkers. Further studies are necessary to determine whether targeting these immune pathways could provide clinical benefits.
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