Abstract
New-onset refractory status epilepticus (NORSE) is rare but intractable. Anti-N-methyl-d-aspartate receptor (NMDAR) encephalitis and cryptogenic etiologies are the two major causes of NORSE with distinct clinical features. To elucidate the underlying mechanisms, 6 patients with anti-NMDAR encephalitis NORSE and 5 with cryptogenic NORSE (C-NORSE) were enrolled. Five patients of cerebrovascular disorders were used as controls. Quantitative proteomic analysis of the cerebrospinal fluid (CSF) samples of the patients revealed 101 and 56 proteins were changed, respectively. The average fold-change of the upregulated proteins, namely up-proteomic score in this study, was positively correlated with the severity and prognosis of the diseases, including ICU stay (r = 0.9308, P = 0.0035 in NMDAR group; r = 0.8977, P = 0.0193 in C-NORSE group), mRS score at discharge (r = 0.9710, P = 0.0111 in NMDAR group; r = 0.7071, P = 0.2000 in C-NORSE group), and time taken for patients awaking from a coma (r = 0.8823, P = 0.0100 in NMDAR group; r = 0.7906, P = 0.2000 in C-NORSE group). Pathways involved in humoral immune response, wound healing, and epigenetic regulation of transcription were upregulated in anti-NMDAR encephalitis NORSE. Pathways of innate and lymphocyte mediated immune response, synaptic functions, ubiquitination, and cell apoptosis were up-regulated in C-NORSE, which was consistent with a mouse model of status epilepticus. Fc receptor and B cell mediated immunity signaling pathways were downregulated in C-NORSE. Immunome microarray analysis demonstrated high autoantibody targeting 48 proteins in CSF samples of anti-NMDAR encephalitis NORSE. While the reaction was kept at a very low level in C-NORSE. There is no significant difference in inflammatory cytokine level between each group. The level of IL-4 (r = 0.7435, P = 0.0451), IL-13 (r = 0.7643, P = 0.0384), IFN-γ (r = 0.7973, P = 0.0287) and TNF-α (r = 0.8598, P = 0.0141) in NMDAR group, and IL-6 (r = 0.8479, P = 0.0348), IL-8 (r = 0.9076, P = 0.0166) in C-NORSE group were positively correlated with the up-proteomic score. The present study suggests that the up-proteomic score of CSF could be a promising indicator for assessment of the severity of anti-NMDAR encephalitis NORSE and C-NORSE. The distinct CSF proteomes imply different pathogenic mechanisms of the two diseases, and immunotherapy strategies as well.
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Acknowledgements
We would like to thank enrolled patients for their participation in the study. We also thank the colleagues of our Neurology Department and Laboratory of Diagnosis of Neurological Disorders and Neuroprotection Research for their advice and support through the course of this work.
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This work was supported by National Key R&D Program of China (2020YFC2006400 to Gao), Key-Area Research and Development Program of Guangdong Province (2021B0101420005 to Gao), National Natural Science Foundation of China (82171602 to Xu, 82071484 to Wu), President Foundation of Nanfang Hospital (2019B007 to Wang, 2020B008 to Xu), Medical Science and Technology Foundation of Guangdong Province (A2021151 to Xu) and Natural Science Foundation of Guangdong Province (2019A1515011760 to Wu).
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DW, YG, and KX are responsible for concepts and design. YP, KX, YW, and SW are responsible for data collecting and statistical analysis. GL and YP are responsible for immunostaining tests of all the patients. All authors acquired, analyzed, and interpreted the data. All authors contributed intellectually. The manuscript was prepared by DW and KX. All authors read and approved the final manuscript.
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Wang, D., Wu, Y., Pan, Y. et al. Multi-proteomic Analysis Revealed Distinct Protein Profiles in Cerebrospinal Fluid of Patients Between Anti-NMDAR Encephalitis NORSE and Cryptogenic NORSE. Mol Neurobiol 60, 98–115 (2023). https://doi.org/10.1007/s12035-022-03011-1
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DOI: https://doi.org/10.1007/s12035-022-03011-1