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Subacute sclerosing panencephalitis and immune thrombocytopenia: More than a coincidence?
1Department of Pediatric Neurology, Hacettepe University Faculty of Medicine, Ankara, Turkey.; Department of Pediatric Neurology, Istanbul University Cerrahpasa Faculty of Medicine, Istanbul, Turkey.
Abstract:
Subacute sclerosing panencephalitis (SSPE) is a progressive disease caused by persistent measles virus (MV). It has an incidence of 0.4-2.0/million in Turkey. Immune thrombocytopenia (ITP) is a bleeding disorder whose estimated incidence is 4.2/100.000 person/years in the pediatric age group. We observed three cases with ITP in our cohort of 315 pediatric SSPE cases, an incidence higher than coincidentally expected in the general population. We hypothesize an association between SSPE and ITP. Our three cases had measles 1-2 years before the onset of ITP and 8-10 years before first symptoms of SSPE. A common immunogenetic background creating susceptibility to infection and autoimmunity might play a role. Alternatively, chronic antigenic stimulation by the MV leading to synthesis of cross-reacting antibodies against platelets, or treatment of ITP with immunoglobulins or steroids might affect or alter the development and manifestation of SSPE. The co-occurrence of these two disorders of viral and immune pathogenesis may draw attention to similar observations and provide clues for their mechanisms.
Insights
Subacute sclerosing panencephalitis (SSPE), a persistent measles virus infection, may be associated with immune thrombocytopenia (ITP). This observation in pediatric cases suggests a potential link requiring further investigation into shared pathogenic mechanisms.
Area of Science:
- Neurology
- Immunology
- Virology
Background:
- Subacute sclerosing panencephalitis (SSPE) is a rare, progressive neurological disease resulting from persistent measles virus (MV) infection.
- Immune thrombocytopenia (ITP) is a bleeding disorder characterized by low platelet counts, particularly noted in the pediatric population.
Observation:
- Three cases of ITP were identified within a cohort of 315 pediatric SSPE patients.
- The observed incidence of ITP among SSPE cases exceeded the expected rate in the general pediatric population.
Findings:
- The study hypothesizes a potential association between SSPE and ITP, suggesting a link beyond mere coincidence.
- Cases presented with a temporal sequence: measles infection preceding ITP by 1-2 years, and SSPE onset 8-10 years after measles.
Implications:
- The findings suggest a possible common immunogenetic susceptibility to both viral infection and autoimmunity.
- Alternative hypotheses include MV-induced cross-reactive antibodies against platelets or modulation of SSPE by ITP treatments.
- The co-occurrence warrants further research into the shared pathogenetic mechanisms of these distinct disorders.
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