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Tang C, Yang W, Luan G. Progress in pathogenesis and therapy of Rasmussen's encephalitis. Acta Neurol Scand 2022; 146:761-766. [PMID: 36189924 DOI: 10.1111/ane.13712] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 09/20/2022] [Indexed: 01/15/2023]
Abstract
Rasmussen's encephalitis (RE) is a rare condition of unknown etiology that causes a severe chronically neurological disorder with mostly affecting children. The main clinical feature of RE includes frequent seizures with drug-resistant, unilateral hemispheric atrophy, and progressive neurological deficits. In this review, we summarized five pathogenesis on the basis of the current research including virus infection, antibody-mediated degeneration, cell-mediated immunity, microglia-induced degeneration, and genetic mutations. So far, no exact virus in RE brain tissue or definite antigen in humoral immune system was confirmed as the determined etiology. The importance of cytotoxic CD8+ T lymphocytes and activated microglial and the role of their immune mechanism in RE development are gradually emerging with the deep study. Genetic researches support the notion that the pathogenesis of RE is probably associated with single nucleotide polymorphisms on immune-related genes, which is driven by affecting inherent antiretroviral innate immunity. Recent advances in treatment suggest immunotherapy could partially slows down the progression of RE according to the histopathology and clinical presentation, which aimed at the initial damage to the brain by T cells and microglia in the early stage. However, the cerebral hemispherectomy is an effective means to controlling the intractable seizure, which is accompanied by neurological complications inevitably. So, the optimal timing for surgical intervention is still a challenge for RE patient. On the contrary, exploration on other aspects of pathogenesis such as dysfunction of adenosine system may offer a new therapeutic option for the treatment of RE in future.
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Affiliation(s)
- Chongyang Tang
- Department of Neurosurgery, SanBo Brain Hospital, Capital Medical University, Beijing, China
| | - Wei Yang
- Beijing Key Laboratory of Epilepsy, Beijing, China.,Center of Epilepsy, Beijing Institute for Brain Disorders, Beijing, China
| | - Guoming Luan
- Department of Neurosurgery, SanBo Brain Hospital, Capital Medical University, Beijing, China.,Beijing Key Laboratory of Epilepsy, Beijing, China.,Center of Epilepsy, Beijing Institute for Brain Disorders, Beijing, China
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2
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McGill F, Tokarz R, Thomson EC, Filipe A, Sameroff S, Jain K, Bhuva N, Ashraf S, Lipkin WI, Corless C, Pattabiraman C, Gibney B, Griffiths MJ, Geretti AM, Michael BD, Beeching NJ, McKee D, Hart IJ, Mutton K, Jung A, Miller A, Solomon T. Viral capture sequencing detects unexpected viruses in the cerebrospinal fluid of adults with meningitis. J Infect 2022; 84:499-510. [PMID: 34990710 DOI: 10.1016/j.jinf.2021.12.042] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 12/20/2021] [Accepted: 12/29/2021] [Indexed: 12/31/2022]
Abstract
OBJECTIVES Many patients with meningitis have no aetiology identified leading to unnecessary antimicrobials and prolonged hospitalisation. We used viral capture sequencing to identify possible pathogenic viruses in adults with community-acquired meningitis. METHODS Cerebrospinal fluid (CSF) from 73 patients was tested by VirCapSeq-VERT, a probe set designed to capture viral targets using high throughput sequencing. Patients were categorised as suspected viral meningitis - CSF pleocytosis, no pathogen identified (n = 38), proven viral meningitis - CSF pleocytosis with a pathogen identified (n = 15) or not meningitis - no CSF pleocytosis (n = 20). RESULTS VirCapSeq-VERT detected virus in the CSF of 16/38 (42%) of those with suspected viral meningitis, including twelve individual viruses. A potentially clinically relevant virus was detected in 9/16 (56%). Unexpectedly Toscana virus, rotavirus and Saffold virus were detected and assessed to be potential causative agents. CONCLUSION VirCapSeq-VERT increases the probability of detecting a virus. Using this agnostic approach we identified Toscana virus and, for the first time in adults, rotavirus and Saffold virus, as potential causative agents in adult meningitis. Further work is needed to determine the prevalence of atypical viral candidates as well as the clinical impact of using sequencing methods in real time. This knowledge can help to reduce antimicrobial use and hospitalisations leading to both patient and health system benefits.
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Affiliation(s)
- Fiona McGill
- Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool, UK; Tropical and Infectious Disease Unit, Liverpool University Hospitals NHS Foundation Trust, Liverpool, UK; Leeds Teaching Hospitals NHS Trust, Leeds, UK; National Institute for Health Research Health Protection Research Unit in Emerging and Zoonotic Infections, University of Liverpool, Liverpool, UK.
| | - Rafal Tokarz
- Center for Infection and Immunity, Mailman School of Public Health, Columbia University, NY, USA
| | - Emma C Thomson
- Institute of infection, immunity and inflammation, University of Glasgow, Glasgow, UK
| | - Ana Filipe
- Institute of infection, immunity and inflammation, University of Glasgow, Glasgow, UK
| | - Stephen Sameroff
- Center for Infection and Immunity, Mailman School of Public Health, Columbia University, NY, USA
| | - Komal Jain
- Center for Infection and Immunity, Mailman School of Public Health, Columbia University, NY, USA
| | - Nishit Bhuva
- Center for Infection and Immunity, Mailman School of Public Health, Columbia University, NY, USA
| | - Shirin Ashraf
- Institute of infection, immunity and inflammation, University of Glasgow, Glasgow, UK
| | - W Ian Lipkin
- Center for Infection and Immunity, Mailman School of Public Health, Columbia University, NY, USA
| | - Caroline Corless
- Liverpool Specialist virology centre, Department of Infection and Immunity, Liverpool Clinical Laboratories, Liverpool University Hospitals NHS Foundation Trust, Liverpool, UK
| | - Chitra Pattabiraman
- Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool, UK; National Institute for Mental Health and Neurosciences, Bangalore, India
| | - Barry Gibney
- UK Health Security Agency (previously Public Health England), UK
| | - Michael J Griffiths
- Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool, UK; Alder Hey Children's NHS Foundation Trust, Liverpool, UK; National Institute for Health Research Health Protection Research Unit in Emerging and Zoonotic Infections, University of Liverpool, Liverpool, UK
| | - Anna Maria Geretti
- Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool, UK; Tropical and Infectious Disease Unit, Liverpool University Hospitals NHS Foundation Trust, Liverpool, UK; Faculty of Medicine, University of Rome Tor Vergata
| | - Benedict D Michael
- Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool, UK; Department of Neurology, The Walton Centre NHS Foundation Trust, Liverpool, UK; National Institute for Health Research Health Protection Research Unit in Emerging and Zoonotic Infections, University of Liverpool, Liverpool, UK
| | - Nicholas J Beeching
- Tropical and Infectious Disease Unit, Liverpool University Hospitals NHS Foundation Trust, Liverpool, UK; Liverpool School of Tropical Medicine, Liverpool, UK; National Institute for Health Research Health Protection Research Unit in Emerging and Zoonotic Infections, University of Liverpool, Liverpool, UK
| | - David McKee
- Central Manchester Foundation Trust, Manchester, UK
| | - Ian J Hart
- Liverpool Specialist virology centre, Department of Infection and Immunity, Liverpool Clinical Laboratories, Liverpool University Hospitals NHS Foundation Trust, Liverpool, UK
| | - Ken Mutton
- University of Manchester, Manchester, UK
| | - Agam Jung
- Leeds Teaching Hospitals NHS Trust, Leeds, UK
| | - Alastair Miller
- Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool, UK
| | - Tom Solomon
- Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool, UK; Department of Neurology, The Walton Centre NHS Foundation Trust, Liverpool, UK; National Institute for Health Research Health Protection Research Unit in Emerging and Zoonotic Infections, University of Liverpool, Liverpool, UK.
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3
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Wang Y, Luo Q, Guan Y, Fan D, Luan G, Jing A. HCMV infection and IFITM3 rs12252 are associated with Rasmussen's encephalitis disease progression. Ann Clin Transl Neurol 2021; 8:558-570. [PMID: 33465303 PMCID: PMC7951106 DOI: 10.1002/acn3.51289] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 11/25/2020] [Accepted: 12/01/2020] [Indexed: 11/21/2022] Open
Abstract
OBJECTIVE Rasmussen's encephalitis (RE) is a rare and severe progressive epileptic syndrome with unknown etiology. Infection by viruses such as human cytomegalovirus (HCMV) has been hypothesized to be a potential trigger for RE. Interferon-induced transmembrane protein-3 (IFITM3) single-nucleotide polymorphism (SNP) rs12252 is associated with the severity of viral infection disease. This study aimed to address the possibility that HCMV infection and IFITM3 rs12252 might be associated with RE disease progression. METHODS The expression of HCMV and IFITM3 was detected with immunohistochemical staining, in situ hybridization and immunofluorescence double staining. The genotype of IFITM3 rs12252 was detected using the Sanger sequencing method. A genetic association analysis was carried out for this SNP and HCMV antigen expression. The relationship between this SNP and the clinical characteristics of these patients was further analyzed. In in vitro study, HCMV replication in SH-SY5Y cells with overexpressed IFITM3 variant was detected by immunofluorescence and real-time RT-PCR. RESULTS Elevated expression of HCMV and IFITM3 was observed in the brain tissue of RE patients. Moreover, the IFITM3 polymorphism rs12252-C was found to associate with HCMV high detection and rapid disease progression in RE patients with the IFITM3 rs12252-CC genotype. In vitro study showed the overexpressed IFITM3 variant was associated with HCMV high infection level. CONCLUSION These results suggest that the IFITM3 rs12252-C is associated with the disease progression of RE patients via facilitating persistent HCMV infection in brain tissue and provides new insight into understanding the pathogenesis of RE.
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Affiliation(s)
- Yi‐Song Wang
- Department of MicrobiologyCapital Medical University School of Basic Medical SciencesBeijingChina
| | - Qiao‐Li Luo
- Department of MicrobiologyCapital Medical University School of Basic Medical SciencesBeijingChina
| | - Yu‐Guang Guan
- Department of NeurosurgeryCapital Medical University Sanbo Brain HospitalBeijingChina
- Beijing Institute for Brain DisordersBeijingChina
| | - Dong‐Ying Fan
- Department of MicrobiologyCapital Medical University School of Basic Medical SciencesBeijingChina
| | - Guo‐Ming Luan
- Department of NeurosurgeryCapital Medical University Sanbo Brain HospitalBeijingChina
- Beijing Institute for Brain DisordersBeijingChina
| | - An Jing
- Department of MicrobiologyCapital Medical University School of Basic Medical SciencesBeijingChina
- Beijing Institute for Brain DisordersBeijingChina
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Tang C, Luan G, Li T. Rasmussen's encephalitis: mechanisms update and potential therapy target. Ther Adv Chronic Dis 2020; 11:2040622320971413. [PMID: 33294146 PMCID: PMC7705182 DOI: 10.1177/2040622320971413] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Accepted: 10/15/2020] [Indexed: 12/11/2022] Open
Abstract
Rasmussen’s encephalitis (RE) is rare neurological diseases characterized as epilepsia partialis continua, invariably hemiparesis, and cognitive impairment. This disease is encountered frequently in childhood and presents with progressive atrophy of the unilateral hemisphere, and there are also sustained neurological complications. Owing to uncertain pathogenesis, the most effective way to limit the influence of seizures currently is cerebral hemispherectomy. In this review, we focus on four main lines of pathogenesis: virus infection, antibody-mediated, cell-mediated immunity, and microglia activation. Although one or more antigenic epitopes may give rise to infiltrating T cell responses in RE brain tissue, no exact antigen was confirmed as the definite cause of the disease. On the other hand, the appearance of antibodies related with RE seem to be a secondary pathological process. Synthetic studies have suggested an adaptive immune mechanism mediated by CD8+ T cells and an innate immune mechanism mediated by activated microglia and neuroglia. Accordingly, opinions have been raised that immunomodulatory treatments aimed at initial damage to the brain that are induced by cytotoxic CD8+ T cell lymphocytes and microglia in the early stage of RE slow down disease progression. However, systematic exploration of the theory behind these therapeutic effects based on multicenter and large sample studies are needed. In addition, dysfunction of the adenosine system, including the main adenosine removing enzyme adenosine kinase and adenosine receptors, has been demonstrated in RE, which might provide a novel therapeutic target for treatment of RE in future.
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Affiliation(s)
- Chongyang Tang
- Department of Neurosurgery, SanBo Brain Hospital, Capital Medical University, Beijing, China
| | - Guoming Luan
- Department of Neurosurgery, SanBo Brain Hospital, Capital Medical University, Beijing, China
| | - Tianfu Li
- Department of Neurology, SanBo Brain Hospital, Capital Medical University No. 50 Xiangshanyikesong Road, Haidian District, Beijing, 100093, China
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5
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Lin CH, Chien WC, Chung CH, Chiang CP, Wang WM, Chang HA, Kao YC, Tzeng NS. Increased risk of dementia in patients with genital warts: A nationwide cohort study in Taiwan. J Dermatol 2020; 47:503-511. [PMID: 32189395 DOI: 10.1111/1346-8138.15277] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Accepted: 01/26/2020] [Indexed: 12/23/2022]
Abstract
Genital warts are a common sexually transmitted disease caused by human papillomavirus (HPV) infections. The prevalence of dementia is 4-8% in those aged 65 years or older in Taiwanese community studies, with a high social and economic burden for patients, family caregivers, the community and society. Previous studies have shown that viral infections such as herpes simplex and herpes zoster were associated with dementia. This study aimed to investigate the association between dementia and HPV infections. A population-based cohort study using data from Taiwan's National Health Insurance Research Database was conducted. Fine and Grays's survival analysis was employed to estimate the hazard ratios (HR) and 95% confidence intervals (CI) for the association between genital warts and dementia. From all of the potential participants aged 50 years or more, a total of 16 116 patients were enrolled, including 4029 genital warts-infected patients, with 12 087 sex-, age- and indexed date-matched controls (1:3). The cumulative incidences of dementia were 10.72 per 103 person-years and 6.43 per 103 person-years in the genital warts and control group, respectively. There were 475 dementia cases from the genital warts cohort during the follow-up period of 15 years. The adjusted HR for dementia was 1.485 (95% CI, 1.321-1.668; P < 0.001) for genital warts patients after adjusting for all of the covariates. Our study indicates that genital warts infection may increase the risk of dementia.
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Affiliation(s)
- Chia-Hua Lin
- Department of Dermatology, Tri-Service General Hospital, School of Medicine, National Defense Medical Center, Taipei, Taiwan.,Department of Dermatology, Tri-Service General Hospital, Penghu Branch, National Defense Medical Center, Penghu, Taiwan
| | - Wu-Chien Chien
- Department of Medical Research, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan.,School of Public Health, National Defense Medical Center, Taipei, Taiwan.,Graduate Institute of Life Sciences, National Defense Medical Center, Taipei, Taiwan
| | - Chi-Hsiang Chung
- School of Public Health, National Defense Medical Center, Taipei, Taiwan.,Graduate Institute of Life Sciences, National Defense Medical Center, Taipei, Taiwan.,Taiwanese Injury Prevention and Safety Promotion Association, Taipei, Taiwan
| | - Chien-Ping Chiang
- Department of Dermatology, Tri-Service General Hospital, School of Medicine, National Defense Medical Center, Taipei, Taiwan
| | - Wei-Ming Wang
- Department of Dermatology, Tri-Service General Hospital, School of Medicine, National Defense Medical Center, Taipei, Taiwan
| | - Hsin-An Chang
- Department of Psychiatry, Tri-Service General Hospital, School of Medicine, Taipei, Taiwan.,Student Counseling Center, Taipei, Taiwan
| | - Yu-Chen Kao
- Department of Psychiatry, Tri-Service General Hospital, School of Medicine, Taipei, Taiwan.,Department of Psychiatry, Tri-Service General Hospital, Song-Shan Branch, National Defense Medical Center, Taipei, Taiwan
| | - Nian-Sheng Tzeng
- Department of Psychiatry, Tri-Service General Hospital, School of Medicine, Taipei, Taiwan.,Student Counseling Center, Taipei, Taiwan
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Liu D, Wang X, Wang Y, Wang P, Fan D, Chen S, Guan Y, Li T, An J, Luan G. Detection of EBV and HHV6 in the Brain Tissue of Patients with Rasmussen's Encephalitis. Virol Sin 2018; 33:402-409. [PMID: 30374827 DOI: 10.1007/s12250-018-0063-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2018] [Accepted: 10/10/2018] [Indexed: 11/29/2022] Open
Abstract
Rasmussen's encephalitis (RE) is a rare pediatric neurological disorder, and the exact etiology is not clear. Viral infection may be involved in the pathogenesis of RE, but conflicting results have reported. In this study, we evaluated the expression of both Epstein-Barr virus (EBV) and human herpes virus (HHV) 6 antigens in brain sections from 30 patients with RE and 16 control individuals by immunohistochemistry. In the RE group, EBV and HHV6 antigens were detected in 56.7% (17/30) and 50% (15/30) of individuals, respectively. In contrast, no detectable EBV and HHV6 antigen expression was found in brain tissues of the control group. The co-expression of EBV and HHV6 was detected in 20.0% (6/30) of individuals. In particular, a 4-year-old boy had a typical clinical course, including a medical history of viral encephalitis, intractable epilepsy, and hemispheric atrophy. The co-expression of EBV and HHV6 was detected in neurons and astrocytes in the brain tissue, accompanied by a high frequency of CD8+ T cells. Our results suggest that EBV and HHV6 infection and the activation of CD8+ T cells are involved in the pathogenesis of RE.
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Affiliation(s)
- Dong Liu
- Department of Neurosurgery, Sanbo Brain Hospital, Capital Medical University, Beijing, 100093, China
| | - Xin Wang
- Department of Microbiology, School of Basic Medical Science, Capital Medical University, Beijing, 100069, China
| | - Yisong Wang
- Department of Microbiology, School of Basic Medical Science, Capital Medical University, Beijing, 100069, China
| | - Peigang Wang
- Department of Microbiology, School of Basic Medical Science, Capital Medical University, Beijing, 100069, China
| | - Dongying Fan
- Department of Microbiology, School of Basic Medical Science, Capital Medical University, Beijing, 100069, China
| | - Sichang Chen
- Department of Neurosurgery, Xuanwu Hospital of Capital Medical University, Beijing, 100053, China
| | - Yuguang Guan
- Department of Neurosurgery, Sanbo Brain Hospital, Capital Medical University, Beijing, 100093, China
| | - Tianfu Li
- Department of Neurosurgery, Sanbo Brain Hospital, Capital Medical University, Beijing, 100093, China.,Beijing Key Laboratory of Epilepsy, Beijing, 100093, China
| | - Jing An
- Department of Microbiology, School of Basic Medical Science, Capital Medical University, Beijing, 100069, China. .,Center of Epilepsy, Beijing Institute for Brain Disorders, Beijing, 100093, China.
| | - Guoming Luan
- Department of Neurosurgery, Sanbo Brain Hospital, Capital Medical University, Beijing, 100093, China. .,Beijing Key Laboratory of Epilepsy, Beijing, 100093, China. .,Center of Epilepsy, Beijing Institute for Brain Disorders, Beijing, 100093, China.
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7
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Elevated expression of EBV and TLRs in the brain is associated with Rasmussen's encephalitis. Virol Sin 2017; 32:423-430. [PMID: 29116594 DOI: 10.1007/s12250-017-4058-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Accepted: 09/30/2017] [Indexed: 12/11/2022] Open
Abstract
Rasmussen's encephalitis (RE) is a rare pediatric neurological disorder, the etiology of which remains unclear. It has been speculated that the immunopathogenesis of RE involves damage to neurons, which eventually leads to the occurrence of RE. Viral infection may be a critical factor in triggering RE immunopathogenesis. In this study, we analyzed the expression of Epstein-Barr virus (EBV) antigens as well as of Toll-like receptor 3 (TLR3), TLR9, and downstream adapter TIRdomain-containing adapter-inducing interferon-β (TRIF) in the brain tissues of 26 patients with RE and 16 control individuals using immunohistochemistry (IHC). In the RE group, EBV antigens were detected in 53% of individuals at various expression levels. In contrast, there was no detectable EBV antigen expression in control brain tissues. Moreover, we found marked increases in the expression of TLR3, TLR9, and TRIF in the brain tissues of RE patients compared with levels in the control group. Furthermore, among RE cases, EBV expression and high TLR3 expression were associated with more severe brain atrophy. Our results suggest that the elevated expression of EBV and TLRs may be involved in RE occurrence through the activation of downstream molecules.
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Expression of human cytomegalovirus components in the brain tissues of patients with Rasmussen's encephalitis. Virol Sin 2017; 32:115-121. [PMID: 28303446 PMCID: PMC6702243 DOI: 10.1007/s12250-016-3917-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Accepted: 01/23/2017] [Indexed: 11/07/2022] Open
Abstract
Rasmussen’s encephalitis (RE) is a rare and severe progressive epileptic syndrome
with unknown etiology. Infection by viruses, including human cytomegalovirus (HCMV),
has been speculated to be a potential trigger for RE. However, no viral antigens
have been detected in the brains of patients with RE; thus, a possible clinical
linkage between viral infections and RE has not been firmly established. In this
study, we evaluated the expression of HCMV pp65 antigen in brain sections from 26
patients with RE and 20 non-RE patients by immunohistochemistry and in situ hybridization, and assessed the associations
between HCMV infection and clinical parameters. Elevated expression of HCMV pp65
protein and DNA was observed in 88.5% (23/26) and 69.2% (18/26) of RE cases,
respectively. In the non-RE group, HCMV pp65 antigen was detected only in two cases
(10%), both of which were negative for DNA staining. Additionally, the intensity of
HCMV pp65 staining was correlated with a shorter duration of the prodromal stage,
younger age of seizure onset, and more severe unilateral cortical atrophy. Elevated
expression of HCMV pp65 was observed in RE brain tissue and was correlated with the
clinical features of RE disease. In summary, our results suggested that HCMV
infection may be involved in the occurrence and progression of RE disease. Thus,
further studies are needed to determine whether early treatment with anti-HCMV
antibodies could modulate the course of RE.
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