Journal
FRONTIERS IN IMMUNOLOGY
Volume 14, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fimmu.2023.1274420
Keywords
metabotropic glutamate receptor 5; autoimmune encephalitis; hematopoietic stem cell transplantation; epilepsy; graft-versus-host disease
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This case report highlights a rare occurrence of pediatric NSAS involving anti-mGluR5 AE following hematopoietic stem cell transplantation, with successful treatment using immunoglobulins, steroids, and antiepileptic medications. Understanding and characterizing this condition is crucial for early identification and treatment of anti-mGluR5 AE in children. Serum antibody testing may be a useful tool in diagnosing this autoimmune disorder.
IntroductionNeuronal surface antibody syndromes (NSAS) encompass a growing set of autoimmune neurological disorders, with their predominant clinical presentation being autoimmune encephalitis (AE). The most extensively documented form within NSAS is anti-N-methyl-D-aspartate receptor (NMDAR) autoimmunity. In contrast, other NSAS, such as anti-metabotropic glutamate receptor-5 (mGluR5) autoimmunity, are less common and less comprehensively characterized, particularly in pediatric cases.Case descriptionIn this instance, we present the case of a 7-year-old girl who exhibited abnormal behaviors following hematopoietic stem cell transplantation (HSCT). She received a diagnosis of anti-mGluR5 AE, and her Electroencephalogram (EEG) displayed an increased number of generalized slow waves during wakefulness. Treatment involved intravenous administration of gamma globulin and methylprednisolone, followed by oral prednisone tablets. Levetiracetam was introduced as an antiepileptic therapy during the pulse steroid therapy. Notably, the abnormal behaviors exhibited significant improvement after treatment.ConclusionsTo the best of our knowledge, this is the first report of rare pediatric NSAS involving anti-mGluR5 AE following HSCT. Enhancing our understanding and characterization of this condition may facilitate its recognition and treatment in children. Serum antibody testing could enable early identification and treatment of anti-mGluR5 AE.
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