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1.
BMC Neurol ; 24(1): 229, 2024 Jul 03.
Artigo em Inglês | MEDLINE | ID: mdl-38961320

RESUMO

Cryptococcal meningitis (CM) is a severe fungal disease in immunocompromised patients affecting the central nervous system (CNS). Host response and immunological alterations in the cerebrospinal fluid (CSF) after invasion of Cryptococcus neoformans to the central nervous system have been investigated before but rigorous and comprehensive studies examining cellular changes in the CSF of patients with cryptococccal meningitis are still rare. We retrospectively collected CSF analysis and flow cytometry data of CSF and blood in patients with CM (n = 7) and compared them to HIV positive patients without meningitis (n = 13) and HIV negative healthy controls (n = 7). Within the group of patients with CM we compared those with HIV infection (n = 3) or other immunocompromised conditions (n = 4). Flow cytometry analysis revealed an elevation of natural killer cells and natural killer T cells in the CSF and blood of HIV negative patients with CM, pointing to innate immune activation in early stages after fungal invasion. HIV positive patients with CM exhibited stronger blood-CSF-barrier disruption. Follow-up CSF analysis over up to 150 days showed heterogeneous cellular courses in CM patients with slow normalization of CSF after induction of antifungal therapy.


Assuntos
Antifúngicos , Meningite Criptocócica , Humanos , Meningite Criptocócica/líquido cefalorraquidiano , Meningite Criptocócica/imunologia , Meningite Criptocócica/tratamento farmacológico , Masculino , Feminino , Adulto , Pessoa de Meia-Idade , Antifúngicos/uso terapêutico , Estudos Retrospectivos , Células Matadoras Naturais/imunologia , Células Matadoras Naturais/efeitos dos fármacos , Idoso , Citometria de Fluxo , Infecções por HIV/tratamento farmacológico , Infecções por HIV/imunologia , Infecções por HIV/líquido cefalorraquidiano , Infecções por HIV/complicações
2.
Brain ; 2024 Jul 18.
Artigo em Inglês | MEDLINE | ID: mdl-39021292

RESUMO

Epstein-Barr virus (EBV) infection has long been associated with the development of multiple sclerosis (MS). MS patients have elevated titers of EBV-specific antibodies in serum and show signs of CNS damage only after EBV infection. Regarding CD8+ T-cells, an elevated but ineffective response to EBV was suggested in MS patients, who present with a broader MHC-I-restricted EBV-specific T-cell receptor beta chain (TRB) repertoire compared to controls. It is not known whether this altered EBV response could be subject to dynamic changes, e.g., by approved MS therapies, and whether it is specific for MS. 1317 peripheral blood TRB repertoire samples of healthy donors (n=409), patients with MS (n=710) before and after treatment, patients with neuromyelitis optica spectrum disorder (n=87), myelin-oligodendrocyte-glycoprotein antibody-associated disease (n=64) and Susac's syndrome (n=47) were analyzed. Apart from MS, none of the evaluated diseases presented with a broader anti-EBV TRB repertoire. In MS patients undergoing autologous hematopoietic stem-cell transplantation, EBV reactivation coincided with elevated MHC-I-restricted EBV-specific TRB sequence matches. Therapy with ocrelizumab, teriflunomide or dimethyl fumarate reduced EBV-specific, but not CMV-specific MHC-I-restricted TRB sequence matches. Together, this data suggests that the aberrant MHC-I-restricted T-cell response directed against EBV is specific to MS with regard to NMO, MOGAD and Susac's Syndrome and that it is specifically modified by MS treatments interfering with EBV host cells or activated lymphocytes.

3.
Cell Rep Med ; 5(7): 101622, 2024 Jul 16.
Artigo em Inglês | MEDLINE | ID: mdl-38917802

RESUMO

Progressive multifocal leukoencephalopathy (PML) has been associated with different forms of immune compromise. This study analyzes the chemokine signals and attracted immune cells in cerebrospinal fluid (CSF) during PML to define immune cell subpopulations relevant for the PML immune response. In addition to chemokines that indicate a general state of inflammation, like CCL5 and CXCL10, the CSF of PML patients specifically contains CCL2 and CCL4. Single-cell transcriptomics of CSF cells suggests an enrichment of distinct CD4+ and CD8+ T cells expressing chemokine receptors CCR2, CCR5, and CXCR3, in addition to ITGA4 and the genetic PML risk genes STXBP2 and LY9. This suggests that specific immune cell subpopulations migrate into the central nervous system to mitigate PML, and their absence might coincide with PML development. Monitoring them might hold clues for PML risk, and boosting their recruitment or function before therapeutic immune reconstitution might improve its risk-benefit ratio.


Assuntos
Movimento Celular , Sistema Nervoso Central , Quimiocinas , Leucoencefalopatia Multifocal Progressiva , Humanos , Leucoencefalopatia Multifocal Progressiva/patologia , Leucoencefalopatia Multifocal Progressiva/imunologia , Quimiocinas/metabolismo , Quimiocinas/genética , Movimento Celular/genética , Sistema Nervoso Central/patologia , Sistema Nervoso Central/metabolismo , Sistema Nervoso Central/imunologia , Linfócitos T CD8-Positivos/imunologia , Masculino , Feminino , Linfócitos T CD4-Positivos/imunologia , Linfócitos T CD4-Positivos/metabolismo , Pessoa de Meia-Idade , Idoso
4.
BMC Med Imaging ; 24(1): 4, 2024 01 02.
Artigo em Inglês | MEDLINE | ID: mdl-38166655

RESUMO

BACKGROUND: Susac syndrome (SuS) is a rare autoimmune disease that leads to hearing impairment, visual field deficits, and encephalopathy due to an occlusion of precapillary arterioles in the brain, retina, and inner ear. Given the potentially disastrous outcome and difficulties in distinguishing SuS from its differential diagnoses, such as multiple sclerosis (MS), our exploratory study aimed at identifying potential new SuS-specific neuroimaging markers. METHODS: Seven patients with a definite diagnosis of SuS underwent magnetic resonance imaging (MRI) at 7 Tesla (7T), including T2* weighted and quantitative susceptibility mapping (QSM) sequences. T2 weighted hyperintense lesions were analyzed with regard to number, volume, localization, central vein sign, T1 hypointensity, and focal iron deposits in the center of SuS lesions ("iron dots"). Seven T MRI datasets from the same institute, comprising 75 patients with, among others, MS, served as controls. RESULTS: The "iron dot" sign was present in 71.4% (5/7) of the SuS patients, compared to 0% in our control cohort. Thus, sensitivity was 71.4% and specificity 100%. A central vein sign was only incidentally detected. CONCLUSION: We are the first to demonstrate this type of "iron dot" lesions on highly resolving 7T T2*w and QSM images in vivo as a promising neuroimaging marker of SuS, corroborating previous histopathological ex vivo findings.


Assuntos
Esclerose Múltipla , Síndrome de Susac , Humanos , Síndrome de Susac/diagnóstico por imagem , Síndrome de Susac/patologia , Ferro , Encéfalo/diagnóstico por imagem , Encéfalo/patologia , Imageamento por Ressonância Magnética/métodos , Esclerose Múltipla/diagnóstico por imagem
5.
Sci Adv ; 9(23): eabq7595, 2023 06 09.
Artigo em Inglês | MEDLINE | ID: mdl-37294768

RESUMO

Autoimmune limbic encephalitis (ALE) presents with new-onset mesial temporal lobe seizures, progressive memory disturbance, and other behavioral and cognitive changes. CD8 T cells are considered to play a key role in those cases where autoantibodies (ABs) target intracellular antigens or no ABs were found. Assessment of such patients presents a clinical challenge, and novel noninvasive imaging biomarkers are urgently needed. Here, we demonstrate that visualization of the translocator protein (TSPO) with [18F]DPA-714-PET-MRI reveals pronounced microglia activation and reactive gliosis in the hippocampus and amygdala of patients suspected with CD8 T cell ALE, which correlates with FLAIR-MRI and EEG alterations. Back-translation into a preclinical mouse model of neuronal antigen-specific CD8 T cell-mediated ALE allowed us to corroborate our preliminary clinical findings. These translational data underline the potential of [18F]DPA-714-PET-MRI as a clinical molecular imaging method for the direct assessment of innate immunity in CD8 T cell-mediated ALE.


Assuntos
Encefalite Límbica , Animais , Humanos , Camundongos , Proteínas de Transporte/metabolismo , Inflamação/metabolismo , Encefalite Límbica/diagnóstico por imagem , Tomografia por Emissão de Pósitrons/métodos , Receptores de GABA/metabolismo
6.
Eur J Neurol ; 30(5): 1409-1416, 2023 05.
Artigo em Inglês | MEDLINE | ID: mdl-36752022

RESUMO

BACKGROUND AND PURPOSE: Complement component 5 (C5) targeting therapies are clinically beneficial in patients with acetylcholine receptor antibody+ (AChR-Ab+ ) generalized myasthenia gravis (MG). That clearly implicates antibody-mediated complement activation in MG pathogenesis. Here, classical and alternative complement pathways were profiled in patients from different MG subgroups. METHODS: In a case-control study, concentrations of C3a, C5a and sC5b9 were simultaneously quantified, indicating general activation of the complement system, whether via the classical and lectin pathways (C4a) or the alternative pathway (factors Ba and Bb) in MG patients with AChR or muscle-specific kinase antibodies (MuSK-Abs) or seronegative MG compared to healthy donors. RESULTS: Treatment-naïve patients with AChR-Ab+ MG showed substantially increased plasma levels of cleaved complement components, indicating activation of the classical and alternative as well as the terminal complement pathways. These increases were still present in a validation cohort of AChR-Ab+ patients under standard immunosuppressive therapies; notably, they were not evident in patients with MuSK-Abs or seronegative MG. Neither clinical severity parameters (at the time of sampling or 1 year later) nor anti-AChR titres correlated significantly with activated complement levels. CONCLUSIONS: Markers indicative of complement activation are prominently increased in patients with AChR-Ab MG despite standard immunosuppressive therapies. Complement inhibition proximal to C5 cleavage should be explored for its potential therapeutic benefits in AChR-Ab+ MG.


Assuntos
Autoanticorpos , Ativação do Complemento , Miastenia Gravis , Receptores Colinérgicos , Humanos , Autoanticorpos/imunologia , Estudos de Casos e Controles , Ativação do Complemento/imunologia , Proteínas do Sistema Complemento/análise , Proteínas do Sistema Complemento/imunologia , Miastenia Gravis/classificação , Miastenia Gravis/tratamento farmacológico , Miastenia Gravis/imunologia , Receptores Colinérgicos/imunologia , Via Alternativa do Complemento , Via Clássica do Complemento , Masculino , Feminino , Adulto Jovem , Adulto , Pessoa de Meia-Idade
7.
Ann Neurol ; 92(6): 1046-1051, 2022 12.
Artigo em Inglês | MEDLINE | ID: mdl-36094152

RESUMO

Myasthenia gravis (MG) is an autoimmune disease in which pathogenic immunoglobulin G antibodies bind to acetylcholine receptors (or to functionally related molecules at the neuromuscular junction). B cell expression of the inhibitory immunoglobulin G receptor, Fc-gamma receptor (FcγR) IIB, maintains peripheral immune tolerance, and its absence renders B cells hyperresponsive to autoantigen. Here, we report that FcγRIIB expression levels are substantially reduced in B lineage cells derived from immunotherapy-naïve patients with acetylcholine receptor antibody-positive early-onset MG. In contrast, genetic variants associated with impaired FcγRIIB expression are not enriched in MG, indicating post-transcriptional dysregulation. FcγR-targeted therapies could have therapeutic benefits in MG. ANN NEUROL 2022;92:1046-1051.


Assuntos
Miastenia Gravis , Receptores de IgG , Humanos , Receptores de IgG/genética , Miastenia Gravis/genética , Receptores Colinérgicos , Linfócitos B , Imunoglobulina G
8.
J Exp Med ; 219(11)2022 11 07.
Artigo em Inglês | MEDLINE | ID: mdl-36048016

RESUMO

Epstein-Barr virus (EBV) infection precedes multiple sclerosis (MS) pathology and cross-reactive antibodies might link EBV infection to CNS autoimmunity. As an altered anti-EBV T cell reaction was suggested in MS, we queried peripheral blood T cell receptor ß chain (TCRß) repertoires of 1,395 MS patients, 887 controls, and 35 monozygotic, MS-discordant twin pairs for multimer-confirmed, viral antigen-specific TCRß sequences. We detected more MHC-I-restricted EBV-specific TCRß sequences in MS patients. Differences in genetics or upbringing could be excluded by validation in monozygotic twin pairs discordant for MS. Anti-VLA-4 treatment amplified this observation, while interferon ß- or anti-CD20 treatment did not modulate EBV-specific T cell occurrence. In healthy individuals, EBV-specific CD8+ T cells were of an effector-memory phenotype in peripheral blood and cerebrospinal fluid. In MS patients, cerebrospinal fluid also contained EBV-specific central-memory CD8+ T cells, suggesting recent priming. Therefore, MS is not only preceded by EBV infection, but also associated with broader EBV-specific TCR repertoires, consistent with an ongoing anti-EBV immune reaction in MS.


Assuntos
Infecções por Vírus Epstein-Barr , Esclerose Múltipla , Linfócitos T CD8-Positivos , Infecções por Vírus Epstein-Barr/complicações , Herpesvirus Humano 4 , Humanos , Receptores de Antígenos de Linfócitos T alfa-beta/genética
9.
Brain ; 145(5): 1711-1725, 2022 06 03.
Artigo em Inglês | MEDLINE | ID: mdl-35661859

RESUMO

Alemtuzumab is a monoclonal antibody that causes rapid depletion of CD52-expressing immune cells. It has proven to be highly efficacious in active relapsing-remitting multiple sclerosis; however, the high risk of secondary autoimmune disorders has greatly complicated its use. Thus, deeper insight into the pathophysiology of secondary autoimmunity and potential biomarkers is urgently needed. The most critical time points in the decision-making process for alemtuzumab therapy are before or at Month 12, where the ability to identify secondary autoimmunity risk would be instrumental. Therefore, we investigated components of blood and CSF of up to 106 multiple sclerosis patients before and after alemtuzumab treatment focusing on those critical time points. Consistent with previous reports, deep flow cytometric immune-cell profiling (n = 30) demonstrated major effects on adaptive rather than innate immunity, which favoured regulatory immune cell subsets within the repopulation. The longitudinally studied CSF compartment (n = 18) mainly mirrored the immunological effects observed in the periphery. Alemtuzumab-induced changes including increased numbers of naïve CD4+ T cells and B cells as well as a clonal renewal of CD4+ T- and B-cell repertoires were partly reminiscent of haematopoietic stem cell transplantation; in contrast, thymopoiesis was reduced and clonal renewal of T-cell repertoires after alemtuzumab was incomplete. Stratification for secondary autoimmunity did not show clear immununological cellular or proteomic traits or signatures associated with secondary autoimmunity. However, a restricted T-cell repertoire with hyperexpanded T-cell clones at baseline, which persisted and demonstrated further expansion at Month 12 by homeostatic proliferation, identified patients developing secondary autoimmune disorders (n = 7 without secondary autoimmunity versus n = 5 with secondary autoimmunity). Those processes were followed by an expansion of memory B-cell clones irrespective of persistence, which we detected shortly after the diagnosis of secondary autoimmune disease. In conclusion, our data demonstrate that (i) peripheral immunological alterations following alemtuzumab are mirrored by longitudinal changes in the CSF; (ii) incomplete T-cell repertoire renewal and reduced thymopoiesis contribute to a proautoimmune state after alemtuzumab; (iii) proteomics and surface immunological phenotyping do not identify patients at risk for secondary autoimmune disorders; (iv) homeostatic proliferation with disparate dynamics of clonal T- and B-cell expansions are associated with secondary autoimmunity; and (v) hyperexpanded T-cell clones at baseline and Month 12 may be used as a biomarker for the risk of alemtuzumab-induced autoimmunity.


Assuntos
Doenças Autoimunes , Autoimunidade , Alemtuzumab/efeitos adversos , Doenças Autoimunes/induzido quimicamente , Humanos , Fenótipo , Proteômica
10.
J Neuroinflammation ; 19(1): 19, 2022 Jan 20.
Artigo em Inglês | MEDLINE | ID: mdl-35057809

RESUMO

BACKGROUND: Comprehensive data on the cerebrospinal fluid (CSF) profile in patients with COVID-19 and neurological involvement from large-scale multicenter studies are missing so far. OBJECTIVE: To analyze systematically the CSF profile in COVID-19. METHODS: Retrospective analysis of 150 lumbar punctures in 127 patients with PCR-proven COVID-19 and neurological symptoms seen at 17 European university centers RESULTS: The most frequent pathological finding was blood-CSF barrier (BCB) dysfunction (median QAlb 11.4 [6.72-50.8]), which was present in 58/116 (50%) samples from patients without pre-/coexisting CNS diseases (group I). QAlb remained elevated > 14d (47.6%) and even > 30d (55.6%) after neurological onset. CSF total protein was elevated in 54/118 (45.8%) samples (median 65.35 mg/dl [45.3-240.4]) and strongly correlated with QAlb. The CSF white cell count (WCC) was increased in 14/128 (11%) samples (mostly lympho-monocytic; median 10 cells/µl, > 100 in only 4). An albuminocytological dissociation (ACD) was found in 43/115 (37.4%) samples. CSF L-lactate was increased in 26/109 (24%; median 3.04 mmol/l [2.2-4]). CSF-IgG was elevated in 50/100 (50%), but was of peripheral origin, since QIgG was normal in almost all cases, as were QIgA and QIgM. In 58/103 samples (56%) pattern 4 oligoclonal bands (OCB) compatible with systemic inflammation were present, while CSF-restricted OCB were found in only 2/103 (1.9%). SARS-CoV-2-CSF-PCR was negative in 76/76 samples. Routine CSF findings were normal in 35%. Cytokine levels were frequently elevated in the CSF (often associated with BCB dysfunction) and serum, partly remaining positive at high levels for weeks/months (939 tests). Of note, a positive SARS-CoV-2-IgG-antibody index (AI) was found in 2/19 (10.5%) patients which was associated with unusually high WCC in both of them and a strongly increased interleukin-6 (IL-6) index in one (not tested in the other). Anti-neuronal/anti-glial autoantibodies were mostly absent in the CSF and serum (1509 tests). In samples from patients with pre-/coexisting CNS disorders (group II [N = 19]; including multiple sclerosis, JC-virus-associated immune reconstitution inflammatory syndrome, HSV/VZV encephalitis/meningitis, CNS lymphoma, anti-Yo syndrome, subarachnoid hemorrhage), CSF findings were mostly representative of the respective disease. CONCLUSIONS: The CSF profile in COVID-19 with neurological symptoms is mainly characterized by BCB disruption in the absence of intrathecal inflammation, compatible with cerebrospinal endotheliopathy. Persistent BCB dysfunction and elevated cytokine levels may contribute to both acute symptoms and 'long COVID'. Direct infection of the CNS with SARS-CoV-2, if occurring at all, seems to be rare. Broad differential diagnostic considerations are recommended to avoid misinterpretation of treatable coexisting neurological disorders as complications of COVID-19.


Assuntos
COVID-19/líquido cefalorraquidiano , Adulto , Barreira Hematoencefálica , COVID-19/complicações , Proteínas do Líquido Cefalorraquidiano/líquido cefalorraquidiano , Citocinas/líquido cefalorraquidiano , Europa (Continente) , Feminino , Humanos , Imunidade Celular , Imunoglobulina G/líquido cefalorraquidiano , Ácido Láctico/líquido cefalorraquidiano , Contagem de Leucócitos , Masculino , Pessoa de Meia-Idade , Doenças do Sistema Nervoso/líquido cefalorraquidiano , Doenças do Sistema Nervoso/etiologia , Bandas Oligoclonais/líquido cefalorraquidiano , Estudos Retrospectivos , Punção Espinal , Síndrome de COVID-19 Pós-Aguda
11.
Ann Clin Transl Neurol ; 8(12): 2289-2301, 2021 12.
Artigo em Inglês | MEDLINE | ID: mdl-34841709

RESUMO

OBJECTIVE: Direct pathogenic effects of autoantibodies to the 65 kDa isoform of glutamic acid decarboxylase (GAD65) in autoimmune limbic encephalitis (LE) have been questioned due to its intracellular localization. We therefore hypothesized a pathogenic role for T cells. METHODS: We assessed magnet resonance imaging, neuropsychological and peripheral blood, and CSF flow cytometry data of 10 patients with long-standing GAD65-LE compared to controls in a cross-sectional manner. These data were related to each other within the GAD65-LE group and linked to neuropathological findings in selective hippocampectomy specimen from another two patients. In addition, full-resolution human leukocyte antigen (HLA) genotyping of all patients was performed. RESULTS: Compared to controls, no alteration in hippocampal volume but impaired memory function and elevated fractions of activated HLADR+ CD4+ and CD8+ T cells in peripheral blood and cerebrospinal fluid were found. Intrathecal fractions of CD8+ T cells negatively correlated with hippocampal volume and memory function, whereas the opposite was true for CD4+ T cells. Consistently, antigen-experienced CD8+ T cells expressed increased levels of the cytotoxic effector molecule perforin in peripheral blood, and perforin-expressing CD8+ T cells were found attached mainly to small interneurons but also to large principal neurons together with wide-spread hippocampal neurodegeneration. 6/10 LE patients harbored the HLA-A*02:01 allele known to present the immunodominant GAD65114-123 peptide in humans. INTERPRETATION: Our data suggest a pathogenic effect of CD8+ T cells and a regulatory effect of CD4+ T cells in patients with long-standing GAD65-LE.


Assuntos
Doenças Autoimunes/imunologia , Doenças Autoimunes/patologia , Linfócitos T CD4-Positivos , Linfócitos T CD8-Positivos , Glutamato Descarboxilase/imunologia , Encefalite Límbica/imunologia , Encefalite Límbica/patologia , Adulto , Doenças Autoimunes/sangue , Doenças Autoimunes/líquido cefalorraquidiano , Estudos Transversais , Feminino , Humanos , Encefalite Límbica/sangue , Encefalite Límbica/líquido cefalorraquidiano , Imageamento por Ressonância Magnética , Masculino , Pessoa de Meia-Idade , Adulto Jovem
12.
Artigo em Inglês | MEDLINE | ID: mdl-34697224

RESUMO

BACKGROUND AND OBJECTIVES: CSF in antibody-defined autoimmune encephalitis (AE) subtypes shows subtype-dependent degrees of inflammation ranging from rare and often mild to frequent and often robust. AEs with NMDA receptor antibodies (NMDAR-E) and leucine-rich glioma-inactivated protein 1 antibodies (LGI1-E) represent opposite ends of this spectrum: NMDAR-E with typically frequent/robust and LGI1-E with rare/mild CSF inflammation. For a more in-depth analysis, we characterized CSF findings in acute, therapy-naive NMDAR-E and LGI1-E in a multicentric, retrospective, cross-sectional setting. METHODS: Eighty-two patients with NMDAR-E and 36 patients with LGI1-E from the GErman NEtwork for Research of AuToimmune Encephalitis (GENERATE) with lumbar puncture within 90 days of onset and before immunotherapy were included. CSF parameters comprised leukocytes, oligoclonal bands (OCBs), and CSF/serum ratios for albumin, immunoglobulin G (IgG), A (IgA), and M (IgM), the latter 3 converted to Z scores according to Reiber formulas. The MRZ reaction was tested in 14 patients with NMDAR-E and 6 patients with LGI1-E, respectively. RESULTS: CSF was abnormal in 94% of NMDAR-E but only in 36% of LGI1-E patients. Robust quantitative intrathecal immunoglobulin synthesis (IIS, IgG > IgM >> IgA) was characteristic for NMDAR-E, but absent in LGI-E. In NMDAR-E, CSF leukocytes were higher when IIS was present or more pronounced. In addition, in NMDAR-E, CSF leukocytes were lower and IIS occurred less often and if so to a lesser degree at older age. Patients with NMDAR-E with severe functional impairment more often had positive OCBs. In CSF obtained later than 3 weeks of onset, leukocytes were lower. In parallel, the correlation of leukocytes with IIS disappeared as IIS was partially independent of disease duration. The MRZ reaction was positive in 5 (36%) patients with NMDAR-E. All these associations were completely absent in LGI1-E. Here, younger patients showed more blood-CSF barrier dysfunction. In LGI1-E, but not in NMDAR-E, the blood-CSF barrier was more dysfunctional when CSF leukocytes were higher. DISCUSSION: NMDAR-E and LGI-E differ in their typical extent of CSF inflammation. In addition, the patterns formed by the different inflammatory CSF parameters and their relationship with disease severity, age, and disease duration are subtype-characteristic. Moreover, signs for multiple sclerosis-like chronic inflammation are present in a subgroup of patients with NMDAR-E. These CSF patterns might be markers for the different immunopathogeneses of LGI1-E and NMDAR-E.


Assuntos
Encefalite Antirreceptor de N-Metil-D-Aspartato/líquido cefalorraquidiano , Autoanticorpos/líquido cefalorraquidiano , Doenças Autoimunes do Sistema Nervoso/líquido cefalorraquidiano , Encefalite/líquido cefalorraquidiano , Peptídeos e Proteínas de Sinalização Intracelular/imunologia , Sistema de Registros , Doença Aguda , Adolescente , Adulto , Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Estudos Retrospectivos , Adulto Jovem
13.
Cells ; 10(5)2021 05 18.
Artigo em Inglês | MEDLINE | ID: mdl-34069775

RESUMO

The analysis of cells in the cerebrospinal fluid (CSF) is a routine procedure that is usually performed manually using the Fuchs-Rosenthal chamber and cell microscopy for cell counting and differentiation. In order to reduce the requirement for manual assessment, automated analyses by devices mainly used for blood cell analysis have been also used for CSF samples. Here, we summarize the current state of investigations using these automated devices and critically review their limitations. Despite technical improvements, the lower limit for reliable leukocyte counts in the CSF is still at approximately 20 cells/µL, to be validated depending on the device. Since the critical range for clinical decisions is in the range of 5-30 cells/µL this implies that cell numbers < 30/µL require a manual confirmation. Moreover, the lower limit of reliable erythrocyte detection by automated devices is at approximately 1000/µL. However, even low erythrocyte numbers may be of clinical importance. In contrast, heavily hemorrhagic samples from neurosurgery may be counted automatically at an acceptable precision more quickly. Finally, cell differentiation by automated devices provides only a rough orientation for lymphocytes, granulocytes and monocytes. Other diagnostically important cell types such as tumor cells, siderophages, blasts and others are not reliably detected. Thus, although the automation may give a gross estimate sufficient for the emergency room situation, each CSF requires a manual microscopy for cytological evaluation for the final report. In conclusion, although automated analysis of CSF cells may provide a first orientation of the cell profile in an individual sample, an additional manual cell count and a microscopic cytology are still required and represent the gold standard.


Assuntos
Contagem de Células Sanguíneas/instrumentação , Células Sanguíneas , Líquido Cefalorraquidiano/citologia , Automação Laboratorial , Desenho de Equipamento , Contagem de Eritrócitos/instrumentação , Humanos , Contagem de Linfócitos/instrumentação , Valor Preditivo dos Testes , Reprodutibilidade dos Testes
14.
J Clin Immunol ; 41(6): 1229-1240, 2021 08.
Artigo em Inglês | MEDLINE | ID: mdl-33844127

RESUMO

While posterior reversible encephalopathy syndrome (PRES) is often characterized by an inflammatory cerebrospinal-fluid (CSF) profile, knowledge of immune cell patterns in PRES is lacking. Thus, we retrospectively characterized CSF and peripheral blood (PB) from 15 PRES patients, which we analyzed by multidimensional flow cytometry (FC). Results were compared to 72 controls, as well as to 9 patients with progressive multifocal leukoencephalopathy (PML, as a relevant differential diagnosis) and 15 multiple sclerosis patients (MS, as a classical neuroinflammatory disorder), respectively. Total protein level in CSF from PRES patients was elevated compared to that in controls, but not to MS and PML. In-depth FC analysis revealed no differences for adaptive immune cells (B cells, plasma cells, CD4+, and CD8+ T cells) in PB or CSF of PRES compared to controls. In contrast, we observed alterations of the adaptive immune response in CSF of PML and MS compared to PRES, indicating that the adaptive immune response is not a driver of disease in PRES. Indeed, PRES was characterized by an innate immune response with CD14++/CD16+ (intermediate) monocytes elevated in PB and CSF, while CD14++/CD16- (classical) monocytes were decreased in PB from PRES patients as compared to controls. Levels of CD14++/CD16+ monocytes correlated with the duration of hospital stay as a surrogate marker for disease severity in PRES patients. Our findings argue for a role of innate rather than adaptive immunity in the pathophysiology of PRES. The observed shift in monocyte subsets might provide valuable diagnostic clues for the clinical management of these patients.


Assuntos
Imunidade Inata/imunologia , Síndrome da Leucoencefalopatia Posterior/diagnóstico , Síndrome da Leucoencefalopatia Posterior/imunologia , Imunidade Adaptativa/imunologia , Adulto , Linfócitos T CD4-Positivos/imunologia , Linfócitos T CD8-Positivos/imunologia , Feminino , Humanos , Leucoencefalopatia Multifocal Progressiva/diagnóstico , Leucoencefalopatia Multifocal Progressiva/imunologia , Receptores de Lipopolissacarídeos/imunologia , Masculino , Pessoa de Meia-Idade , Monócitos/imunologia , Receptores de IgG/imunologia , Estudos Retrospectivos
15.
Mult Scler ; 27(10): 1491-1496, 2021 09.
Artigo em Inglês | MEDLINE | ID: mdl-33150829

RESUMO

BACKGROUND: Progressive multifocal leukoencephalopathy (PML) can in rare cases occur in natalizumab-treated patients with high serum anti-JCPyV antibodies, hypothetically due to excessive blockade of immune cell migration. OBJECTIVE: Immune cell recruitment to the central nervous system (CNS) was assessed in relapsing-remitting multiple sclerosis (RRMS) patients stratified by low versus high anti-JCPyV antibody titers as indicator for PML risk. METHODS: Cerebrospinal fluid (CSF) cell counts of 145 RRMS patients were quantified by flow cytometry. Generalized linear models were employed to assess influence of age, sex, disease duration, Expanded Disability Status Scale (EDSS), clinical/radiological activity, current steroid or natalizumab treatment, as well as anti-JCPyV serology on CSF cell subset counts. RESULTS: While clinical/radiological activity was associated with increased CD4, natural killer (NK), B and plasma cell counts, natalizumab therapy reduced all subpopulations except monocytes. With and without natalizumab therapy, patients with high anti-JCPyV serum titers presented with increased CSF T-cell counts compared to patients with low anti-JCPyV serum titers. In contrast, PML patients assessed before (n = 2) or at diagnosis (n = 5) presented with comparably low CD8 and B-cell counts, which increased after plasma exchange (n = 4). CONCLUSION: High anti-JCPyV indices, which could be indicative of increased viral activity, are associated with elevated immune cell recruitment to the CNS. Its excessive impairment in conjunction with viral activity could predispose for PML development.


Assuntos
Vírus JC , Leucoencefalopatia Multifocal Progressiva , Esclerose Múltipla Recidivante-Remitente , Contagem de Células , Humanos , Esclerose Múltipla Recidivante-Remitente/tratamento farmacológico , Natalizumab/uso terapêutico
16.
Proc Natl Acad Sci U S A ; 118(1)2021 01 05.
Artigo em Inglês | MEDLINE | ID: mdl-33376202

RESUMO

Multiple sclerosis (MS) disease risk is associated with reduced sun-exposure. This study assessed the relationship between measures of sun exposure (vitamin D [vitD], latitude) and MS severity in the setting of two multicenter cohort studies (nNationMS = 946, nBIONAT = 990). Additionally, effect-modification by medication and photosensitivity-associated MC1R variants was assessed. High serum vitD was associated with a reduced MS severity score (MSSS), reduced risk for relapses, and lower disability accumulation over time. Low latitude was associated with higher vitD, lower MSSS, fewer gadolinium-enhancing lesions, and lower disability accumulation. The association of latitude with disability was lacking in IFN-ß-treated patients. In carriers of MC1R:rs1805008(T), who reported increased sensitivity toward sunlight, lower latitude was associated with higher MRI activity, whereas for noncarriers there was less MRI activity at lower latitudes. In a further exploratory approach, the effect of ultraviolet (UV)-phototherapy on the transcriptome of immune cells of MS patients was assessed using samples from an earlier study. Phototherapy induced a vitD and type I IFN signature that was most apparent in monocytes but that could also be detected in B and T cells. In summary, our study suggests beneficial effects of sun exposure on established MS, as demonstrated by a correlative network between the three factors: Latitude, vitD, and disease severity. However, sun exposure might be detrimental for photosensitive patients. Furthermore, a direct induction of type I IFNs through sun exposure could be another mechanism of UV-mediated immune-modulation in MS.


Assuntos
Monócitos/efeitos da radiação , Esclerose Múltipla/sangue , Esclerose Múltipla/imunologia , Receptor Tipo 1 de Melanocortina/genética , Transcriptoma/efeitos da radiação , Vitamina D/sangue , Linfócitos B/efeitos da radiação , Estudos de Coortes , Feminino , Variação Genética , Genótipo , Humanos , Interferon beta/farmacologia , Interferon beta/uso terapêutico , Masculino , Pessoa de Meia-Idade , Monócitos/metabolismo , Esclerose Múltipla/patologia , Esclerose Múltipla/radioterapia , Fenótipo , Fototerapia , Recidiva , Índice de Gravidade de Doença , Luz Solar , Linfócitos T/metabolismo , Linfócitos T/efeitos da radiação , Transcriptoma/genética
17.
Fluids Barriers CNS ; 17(1): 65, 2020 Oct 27.
Artigo em Inglês | MEDLINE | ID: mdl-33109245

RESUMO

BACKGROUND: Progressive multifocal leukoencephalopathy (PML) is caused by an opportunistic infection with JC polyoma virus (JCPyV) and mainly affects immunocompromised patients. It leads to pronounced demyelination of the central nervous system (CNS) resulting in severe disability or even death. Detection of JCPyV DNA in the cerebrospinal fluid (CSF) is usually accepted as proof for the diagnosis of PML. Routine CSF parameters, like CSF cell count, protein concentration, Qalbumin, or intrathecal immunoglobulin synthesis are mostly considered normal. However, this has not been investigated systematically. METHODS: We analyzed routine CSF parameters in a cohort of 108 PML patients that were treated at four different neurological centers in Germany. The patients exhibited different underlying conditions with natalizumab-treated multiple sclerosis (n = 54) and human immunodeficiency virus (HIV)-infection (n = 25) being the most frequent. The data were collected at the respective centers in accordance with local requirements and then jointly analyzed. The total PML cohort was compared with a control group of patients with normal pressure hydrocephalus (NPH) and idiopathic intracranial hypertension (IIH). Multiple sclerosis and HIV patients were additionally compared with their own non-PML control groups. RESULTS: The PML group showed an elevated cell count (p < 0.001) compared to the control group, however, this effect was mainly driven by HIV-PML patients. This subgroup also demonstrated a significantly higher proportion of patients with a disturbed blood-CSF-barrier function. CONCLUSIONS: This comprehensive, retrospective study on CSF diagnostic analysis in PML patients provides insight into the CSF of those patients. It demonstrates that CSF composition in PML patients may be specific for the underlying condition that predisposes for the development of PML and thus data have to be interpreted in this context.


Assuntos
Líquido Cefalorraquidiano/citologia , Líquido Cefalorraquidiano/metabolismo , Infecções por HIV/líquido cefalorraquidiano , Leucoencefalopatia Multifocal Progressiva/líquido cefalorraquidiano , Esclerose Múltipla/líquido cefalorraquidiano , Adulto , Feminino , Infecções por HIV/complicações , Humanos , Hidrocefalia de Pressão Normal/líquido cefalorraquidiano , Leucoencefalopatia Multifocal Progressiva/etiologia , Masculino , Pessoa de Meia-Idade , Esclerose Múltipla/complicações , Pseudotumor Cerebral/líquido cefalorraquidiano , Estudos Retrospectivos
18.
J Dermatol Sci ; 100(2): 129-138, 2020 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-33039243

RESUMO

BACKGROUND: It is widely accepted that NKG2D+cells are critically involved in alopecia areata (AA) pathogenesis. However, besides being expressed in CD8+T-cells and NK cells, NKG2D is also found in human γδT-cells. AA lesional hair follicles (HFs) overexpress NKG2D and γδTCR activating ligands, e.g. MICA and CD1d, and chemoattractants for γδT-cells, such as CXCL10. OBJECTIVE: To investigate whether abnormal activities of γδT-cells may be involved in AA pathogenesis. METHODS: We analyzed the number and activation status of γδT-cells in human healthy, lesional and non-lesional AA scalp biopsies by FACS and/or quantitative (immuno-)histomorphometry. RESULTS: In healthy human scalp skin, the few skin-resident γδT-cells were found to be mostly Vδ1+, non-activated (CD69-NKG2Ddim) and positive for CXCL10, and CXCL12 receptors. These Vδ1+T-cells predominantly localized in/around the HF infundibulum. In striking contrast, the number of Vδ1+T-cells was significantly higher around and even inside the proximal (suprabulbar and bulbar) epithelium of lesional AA HFs. These cells also showed a pro-inflammatory phenotype, i.e. higher NKG2D, and IFN-γ and lower CD200R expression. Importantly, more pro-inflammatory Vδ1+T-cells were seen also around non-lesional AA HFs. Lesional AA HFs also showed significantly higher expression of CXCL12. CONCLUSION: Our pilot study introduces skin-resident γδT-cells as a previously overlooked, but potentially important, mostly (auto-)antigen-independent, new innate immunity protagonist in AA pathobiology. The HF infiltration of these activated, IFN-γ-releasing cells already around non-lesional AA HFs suggest that Vδ1+T-cells are involved in the early stages of human AA pathobiology, and may thus deserve therapeutic targeting for optimal AA management.


Assuntos
Alopecia em Áreas/imunologia , Folículo Piloso/patologia , Linfócitos Intraepiteliais/imunologia , Alopecia em Áreas/patologia , Biópsia , Folículo Piloso/citologia , Folículo Piloso/imunologia , Voluntários Saudáveis , Humanos , Imunidade Inata , Projetos Piloto
19.
Epilepsia ; 61(10): e153-e158, 2020 10.
Artigo em Inglês | MEDLINE | ID: mdl-32893887

RESUMO

Inflammation plays a role in the pathogenesis of immune-mediated epilepsy, but also in epilepsy of other etiology such as hippocampal sclerosis. This study aimed to characterize immune cell signatures in the peripheral blood (PB) and cerebrospinal fluid (CSF) in temporal lobe epilepsy (TLE) of different etiologies. We retrospectively evaluated CSF routine parameters and immune cell profiles using flow cytometry in a cohort of 51 patients and 45 age-matched controls with functional disorders. Groups were comprised of patients with nonlesional TLE (n = 26), TLE due to hippocampal sclerosis (n = 14), or limbic encephalitis with antibodies against the 65-kDa isoform of glutamic acid decarboxylase (GAD65-LE; n = 11). TLE patients showed increased proportions of human leukocyte antigen-DR isotype (HLA-DR)-expressing CD4+ T lymphocytes in the CSF. Furthermore, they were characterized by a shift in monocyte subsets toward immature CD14low CD16+ cells in the PB and blood/CSF-barrier dysfunction. Whereas TLE patients in general showed similar immune cell profiles, patients with GAD65-LE differed from other TLE patients by increased proportions of HLA-DR-expressing CD8+ T lymphocytes and type 2/3 oligoclonal bands. These findings point to a role of innate and adaptive immunity in TLE. CSF parameters may help to discriminate epilepsy patients from controls and different forms of TLE from each other.


Assuntos
Imunidade Adaptativa/fisiologia , Epilepsia do Lobo Temporal/sangue , Epilepsia do Lobo Temporal/líquido cefalorraquidiano , Imunidade Inata/fisiologia , Encefalite Límbica/sangue , Encefalite Límbica/líquido cefalorraquidiano , Adulto , Idoso , Biomarcadores/sangue , Biomarcadores/líquido cefalorraquidiano , Epilepsia do Lobo Temporal/diagnóstico , Feminino , Hipocampo/metabolismo , Hipocampo/patologia , Humanos , Encefalite Límbica/diagnóstico , Linfócitos/metabolismo , Masculino , Pessoa de Meia-Idade , Monócitos/metabolismo , Estudos Retrospectivos , Esclerose/sangue , Esclerose/líquido cefalorraquidiano , Esclerose/diagnóstico
20.
Ann Clin Transl Neurol ; 6(12): 2586-2594, 2019 12.
Artigo em Inglês | MEDLINE | ID: mdl-31682087

RESUMO

Allelic variants of genes encoding for the Fc gamma receptors IIIA and IIA have been associated with the clinical response to cell-depleting antibodies in lymphoma patients. Here, we tested the hypothesis that FCGR3A and FCGR2A high-affinity polymorphisms predict clinical outcomes to alemtuzumab therapy in 85 patients with relapsing-remitting multiple sclerosis. No differences in clinical and MRI-based efficacy parameters, the development of severe infusion-associated reactions and secondary autoimmune diseases during a 2 year follow-up was observed based on FCGR3A or FCGR2A polymorphisms. This study does not support the use of FCGR genetic variants to predict clinical outcomes to alemtuzumab.


Assuntos
Alemtuzumab/farmacologia , Fatores Imunológicos/farmacologia , Esclerose Múltipla Recidivante-Remitente/tratamento farmacológico , Esclerose Múltipla Recidivante-Remitente/genética , Avaliação de Resultados em Cuidados de Saúde , Receptores de IgG/genética , Adolescente , Adulto , Feminino , Seguimentos , Humanos , Masculino , Pessoa de Meia-Idade , Adulto Jovem
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