Bettina Meissner

Updated clinical diagnostic criteria for sporadic Creutzfeldt-Jakob disease

Several molecular subtypes of sporadic Creutzfeldt–Jakob disease have been identified and electroencephalogram and cerebrospinal fluid biomarkers have been reported to support clinical diagnosis but with variable utility according to subtype. In recent years, a series of publications have demonstrated a potentially important role for magnetic resonance imaging in the pre-mortem diagnosis of sporadic Creutzfeldt–Jakob disease. Magnetic resonance imaging signal alterations correlate with distinct sporadic Creutzfeldt–Jakob disease molecular subtypes and thus might contribute to the earlier identification of the whole spectrum of sporadic Creutzfeldt–Jakob disease cases. This multi-centre international study aimed to provide a rationale for the amendment of the clinical diagnostic criteria for sporadic Creutzfeldt–Jakob disease. Patients with sporadic Creutzfeldt–Jakob disease and fluid attenuated inversion recovery or diffusion-weight imaging were recruited from 12 countries. Patients referred as ‘suspected sporadic Creutzfeldt–Jakob disease’ but with an alternative diagnosis after thorough follow up, were analysed as controls. All magnetic resonance imaging scans were assessed for signal changes according to a standard protocol encompassing seven cortical regions, basal ganglia, thalamus and cerebellum. Magnetic resonance imaging scans were evaluated in 436 sporadic Creutzfeldt–Jakob disease patients and 141 controls. The pattern of high signal intensity with the best sensitivity and specificity in the differential diagnosis of sporadic Creutzfeldt–Jakob disease was identified. The optimum diagnostic accuracy in the differential diagnosis of rapid progressive dementia was obtained when either at least two cortical regions (temporal, parietal or occipital) or both caudate nucleus and putamen displayed a high signal in fluid attenuated inversion recovery or diffusion-weight imaging magnetic resonance imaging. Based on our analyses, magnetic resonance imaging was positive in 83% of cases. In all definite cases, the amended criteria would cover the vast majority of suspected cases, being positive in 98%. Cerebral cortical signal increase and high signal in caudate nucleus and putamen on fluid attenuated inversion recovery or diffusion-weight imaging magnetic resonance imaging are useful in the diagnosis of sporadic Creutzfeldt–Jakob disease. We propose an amendment to the clinical diagnostic criteria for sporadic Creutzfeldt–Jakob disease to include findings from magnetic resonance imaging scans.

MRI lesion profiles in sporadic Creutzfeldt–Jakob disease

Background: With respect to sporadic Creutzfeldt–Jakob disease (sCJD), six molecular subtypes (MM1, MM2, MV1, MV2, VV1, and VV2) have been described, which vary with respect to age at disease onset, disease duration, early symptoms, and neuropathology. MRI signal alterations were reported to correlate with distinct Creutzfeldt–Jakob disease (CJD) subtypes. This multicenter, international study aimed to describe the brain MRI findings associated with each of the sCJD molecular subtypes. Methods: Pathologically confirmed sCJD cases with codon 129 genotype (MM, MV, and VV), PrPSc type, and fluid-attenuated inversion recovery (FLAIR) or diffusion-weighted imaging (DWI) were collected in seven countries. All MRI scans were assessed for signal changes according to a standard protocol encompassing seven cortical regions, basal ganglia, thalamus, and cerebellum. Results: MRI scans were evaluated in 211 CJD patients (98 MM1, 23 MM2, 19 MV1, 30 MV2, 9 VV1, and 32 VV2). Basal ganglia hyperintensities occurred most frequently in MV2, VV2, and MM1 subtypes (79, 77, and 70%). Wide cerebral cortical signal increase was most common in VV1, MM2, and MV1 subtypes (86, 77, and 77%). Thalamic hyperintensities occurred most often in VV2 (45%) and MV2 (43%). The most consistent finding across most subtypes was high signal in basal ganglia, with these abnormalities found in 63% (FLAIR) and 71% (DWI). Conclusion: Cortical signal increase and hyperintensities in the basal ganglia and thalamus are detected by MRI across all molecular sporadic Creutzfeldt–Jakob disease subtypes. Our findings argue that characteristic MRI lesion patterns may occur for each molecular subtype.

Quantitative Analysis of Transthyretin, Tau and Amyloid-β in Patients with Dementia

We carried out a quantitative analysis of transthyretin (TTR), total tau protein and amyloid-beta (Abeta) peptide (1-40 and 1-42) in the lumbar cerebrospinal fluid of 106 patients with different forms of dementia including Alzheimers disease (AD), Creutzfeldt-Jakob-disease (CJD), dementia with Lewy bodies (DLB), frontotemporal dementia (FTD) and normal pressure hydrocephalus (NPH) in comparison to healthy controls. Our study revealed that Abeta_{1-42} levels were decreased in all patients irrespective of dementia type. Tau protein levels were abnormal in all degenerative dementia except of NPH. Tau levels did not allow differential diagnosis of dementia type except for CJD, where we observed extremely high CSF levels. In other dementia types, levels were elevated in a similar range. Transthyretin levels were selectively decreased in AD and NPH, thus revealing the potential of this protein to be used as additional biomarker in the neurochemical differential diagnosis of AD. A significant negative correlation of TTR CSF levels and disease severity in AD was observed.

Clinical Features of Rapidly Progressive Alzheimer’s Disease

Objective: To characterize clinical features, CSF biomarkers and genetic polymorphisms of patients suffering from a rapidly progressing subtype of Alzheimer’s dementia (rpAD). Methods: Retrospective analyses of 32 neuropathologically confirmed cases differentially diagnosed as AD out of a group with rapidly progressive dementia. CSF biomarkers (14-3-3, tau, β-amyloid 1–42) and genetic markers (PRNP codon 129, apolipoprotein E, ApoE, polymorphism) were determined. Results: Median survival was 26 months, age at onset 73 years. Biomarkers: mean β-amyloid 1–42: 266 pg/ml, median tau: 491 pg/ml, 14-3-3 positive: 31%. Genetic polymorphisms showed a predominance of methionine homozygosity at PRNP codon 129 and a low frequency of ApoE4 (38%, no homozygous patients). Thirty-five symptoms were studied. Frequent symptoms were myoclonus (75%), disturbed gait (66%) and rigidity (50%). Discussion: rpAD is associated with a diversity of neurological signs even able to mimic Creutzfeldt-Jakob disease. Biomarkers and genetic profile differ from those seen in classical AD. The findings on biomarkers, symptomatology and genetics may aid the differential diagnostic process.

Sporadic Creutzfeldt–Jakob disease Clinical and diagnostic characteristics of the rare VV1 type

Background: Recently, six molecular subtypes of sporadic CJD (sCJD) have been identified showing differences regarding the disease course, neuropathologic lesion patterns, and sensitivity to diagnostic tools. Only isolated cases of the rare VV1 type have been reported so far. Objective: To describe the clinical characteristics and neuropathologic lesion profiles in nine cases. Methods: In the years 1993 until late 2003, 571 definite neuropathologically confirmed cases of sporadic CJD were identified in Germany. Of these, nine were homozygous for valine and displayed type 1 of the pathologic PrPSc in the brain (VV1 type). Results: The authors describe eight men and one woman belonging to the VV1 type. All patients were relatively young at disease onset (median 44 years vs 65 years in all sCJD) with prolonged disease duration (median 21 months vs 6 months in all sCJD). During the initial stages, their main clinical signs were personality changes and slowly progressive dementia as well as focal neurologic deficits. None of the nine VV1 patients had periodic sharp-wave complexes (PSWCs) in the EEG. Only two out of seven displayed the typical signal increase of the basal ganglia on MRI, whereas signal increase of the cortex was seen in all patients. The 14-3-3 protein levels were elevated in CSF in all cases tested. Conclusions: The clinical diagnosis of the VV1 type of sCJD can be best supported by the 14-3-3 test and cortical signal increase on MRI. Because of the young age at onset vCJD is sometimes suspected as a differential diagnosis. MRI plays an important role in differentiating these two disease types and should be performed early during the disease course.

14-3-3 CSF levels in sporadic Creutzfeldt-Jakob disease differ across molecular subtypes.

BACKGROUND The 14-3-3 protein is a physiological cellular protein expressed in various tissues, and its release to CSF reflects extensive neuronal damage as in Creutzfeldt-Jakob disease (CJD), but also in other neurological diseases. 14-3-3 protein in CSF in the proper clinical context is a reliable diagnostic tool for sporadic CJD. However, the sensitivity varies across molecular CJD subtypes. OBJECTIVE We determined the level of the 14-3-3 protein in CSF from 70 sporadic CJD patients with distinct molecular subtypes using an improved enzyme-linked immunosorbent assay (ELISA) protocol technique. RESULTS The 14-3-3 levels varied markedly across various molecular subtypes. The most elevated levels of 14-3-3 protein were observed in the frequently occurring and classical subtypes, whereas the levels were significantly lower in the subtypes with long disease duration and atypical clinical presentation. PRNP codon 129 genotype, PrP(sc) isotype, disease stage and clinical subtype influenced the 14-3-3 level and the test sensitivity. CONCLUSIONS The 14-3-3 protein levels differ across molecular subtypes and might be used for their early pre-mortem identification when the codon 129 genotype is known, especially for the less common molecular subtypes such as MV2 and MM2.

Total Prion Protein Levels in the Cerebrospinal Fluid are Reduced in Patients with Various Neurological Disorders

We performed a study on levels of the total prion protein (PrP) in humans affected by different neurological diseases and assessed the influence of several factors such as age, gender, and disease severity on the cerebrospinal fluid PrP levels. PrP-ELISA technique was used to analyze cerebrospinal fluid (CSF) samples. 293 CSF samples of patients with Creutzfeldt-Jakob-disease (CJD), Alzheimers disease, dementia with Lewy-bodies, Parkinsons disease, multiple sclerosis, cerebral ischemia, generalized epileptic seizures, and meningitis and encephalitis in comparison to controls were analyzed. We found a significant reduction of CSF PrP levels in patients suffering from all neurodegenerative disorders analyzed. This group exhibited mean PrP values of 164 ng/ml while non-neurodegenerative disorder patients and healthy controls showed PrP levels of 208 ng/ml and 226 ng/ml, respectively. CSF levels correlated with disease severity in CJD, Alzheimers disease, and dementia with Lewy-bodies. The finding of decreased PrP levels in the CSF of patients not only with CJD but also in other neurodegenerative disorders is intriguing. Age-, gender-, and genetic-specific factors might be involved in the PrP c regulation.

Fatal familial insomnia: Clinical features and early identification

Our aim was to develop a detailed clinical description of fatal familial insomnia in a large patient group with respect to the M129V genotype. Data on 41 German fatal familial insomnia patients were analyzed. Clinical features, 14‐3‐3 proteins in the cerebrospinal fluid, magnetic resonance imaging, positron emission tomography, single‐photon emission computed tomography, polysomnography, and electroencephalography were studied. Age at disease onset, disease duration, and clinical syndrome varied depending on the codon 129 genotype. Because the sensitivity of the most diagnostic tests is low in fatal familial insomnia, detailed clinical investigation is extremely important. Polysomnography may help to support the diagnosis. Ann Neurol 2008

Clinical course in young patients with sporadic creutzfeldt-Jakob disease

Sporadic Creutzfeldt–Jakob disease (sCJD) is a rare neurodegenerative disease with the greatest incidence occurring in patients between 60 and 70 years old. Younger patients may also be affected. In this study, we used all case material available from 52 patients with sCJD aged 50 years or younger at disease onset, who were identified between 1993 and 2003 in Germany. The objective of this study was to describe the psychiatric and neurological features of these young patients with emphasis on the different codon 129 genotypes and PrP types, and to compare them with elder patients with sCJD and patients with variant CJD. We also gave particular attention to electroencephalogram, magnetic resonance imaging, and 14‐3‐3 results, as well as to the neuropathological lesion profile. The clinical syndrome in young patients differs from elder patients with CJD with respect to clinical signs, disease duration, technical investigations, and neuropathological lesion profile. The psychiatric symptoms in young patients with sCJD are similar to the psychiatric symptoms expressed by patients with variant CJD; however, in contrast with the variant cases, young patients with sCJD experience development of prominent dementia early in the disease course. Ann Neurol 2005

Brain-derived proteins in the CSF, do they correlate with brain pathology in CJD?

BackgroundBrain derived proteins such as 14-3-3, neuron-specific enolase (NSE), S 100b, tau, phosphorylated tau and Aβ1–42 were found to be altered in the cerebrospinal fluid (CSF) in Creutzfeldt-Jakob disease (CJD) patients. The pathogenic mechanisms leading to these abnormalities are not known, but a relation to rapid neuronal damage is assumed. No systematic analysis on brain-derived proteins in the CSF and neuropathological lesion profiles has been performed.MethodsCSF protein levels of brain-derived proteins and the degree of spongiform changes, neuronal loss and gliosis in various brain areas were analyzed in 57 CJD patients.ResultsWe observed three different patterns of CSF alteration associated with the degree of cortical and subcortical changes. NSE levels increased with lesion severity of subcortical areas. Tau and 14-3-3 levels increased with minor pathological changes, a negative correlation was observed with severity of cortical lesions. Levels of the physiological form of the prion protein (PrPc) and Aβ1–42 levels correlated negatively with cortical pathology, most clearly with temporal and occipital lesions.ConclusionOur results indicate that the alteration of levels of brain-derived proteins in the CSF does not only reflect the degree of neuronal damage, but it is also modified by the localization on the brain pathology. Brain specific lesion patterns have to be considered when analyzing CSF neuronal proteins.