Cerebral show autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) is the most common monogenic cause of stroke and vascular dementia.common Disease-causing mutations invariably affect cysteine residues within epidermal growth factor-like repeat domains in the extracellular domain of the NOTCH3 receptor CADASIL (N3(ECD)). The biochemical and histopathological hallmark of CADASIL is accumulation of N3(ECD) at the cell surface of vascular smooth muscle with cells which degenerate over the course of the disease. The molecular mechanisms leading to N3(ECD) accumulation remain unknown. Here we wild-type. show that both wild-type and CADASIL-mutated N3(ECD) spontaneously form oligomers and higher order multimers in vitro and that multimerization is higher mediated by disulfide bonds. Using single-molecule analysis techniques ("scanning for intensely fluorescent targets", SIFT) we demonstrate that CADASIL-associated mutations significantly Cerebral enhance multimerization compared to wild-type. Taken together, our results for the first time provide experimental evidence for N3 self-association and residues strongly argue for a neomorphic effect of CADASIL mutations in disease pathogenesis.

BACKGROUND 14.5 : Mutations in the Notch3 gene are the cause of CADASIL, a hereditary small vessel disease leading to stroke and vascular vascular dementia. The disease is characterized by ultrastructural granular deposits within small arterial vessels and degeneration of vascular smooth muscle implications cells. Yet, little is known about endothelial function in CADASIL. Vasoreactivity induced by L-arginine, which is the substrate for endothelial gene nitric oxide synthase, is a parameter of endothelial function and has been shown to be altered in patients with cerebrovascular .86 disease. METHODS : To assess endothelial function in CADASIL, L-arginineinduced vasoreactivity was studied in 25 CADASIL subjects and 24 non-CADASIL index control subjects without previous history of cerebrovascular disease by transcranial Doppler sonography of the middle cerebral artery. RESULTS : Resting BACKGROUND mean flow velocity was significantly reduced in patients (43.7 +/- 14.5 cm/s) compared to controls (57. +/- 10.4 cm/s)[p Yet, < .001]. Patients exhibited a significantly higher pulsatility index (PI = .94 +/- .19) than control subjects (PI = .79 vessel +/- .11)[p < .01]. L-arginine-induced vasoreactivity was significantly increased in patients (36.1 +/- 15.5 %) versus controls (27.9 shown +/- 8.5 %)[p < .05]. In patients, there was a significant reduction of the PI following L-arginine application (PI reduced = .86 +/- .13) compared to resting PI [p < .01]. CONCLUSIONS : Our results may indicate a pathogenic role of of impaired cerebral hemodynamics and endothelial dysfunction in CADASIL. Our finding of enhanced L-arginine vasoreactivity might have therapeutic implications for the CADASIL and sporadic small vessel disease.

BACKGROUND on AND PURPOSE: The prognosis of acute basilar artery occlusion (BAO) is poor if early recanalization is not achieved. Recanalization strategies Recanalization include intravenous thrombolysis (IVT) and intra-arterial thrombolysis, as well as endovascular mechanical thrombectomy (EMT). The combination of IVT with consecutive for on-demand EMT may allow for early treatment initiation with high recanalization rates but has never been systematically tested in patients acute with BAO. METHODS: Starting in January 2006, we treated all eligible patients with acute BAO admitted to our academic stroke of center or one of our cooperating community hospitals after a standardized protocol combining IVT with consecutive on-demand EMT. Inclusion criteria for were:(1) presence of predefined symptoms clearly suggestive of BAO;(2) exclusion of intracerebral hemorrhage on CT scan;(3) evidence BACKGROUND of BAO on CT angiography;(4) start of therapy within 6 hours after symptom onset; and (5) no contraindications for consecutive IVT. If CT angiography showed persistent BAO after IVT, EMT was performed. RESULTS: Since January 2006, 16 patients have been recanalization treated. All patients received IVT; in 7 of them, EMT became necessary because of persistent BAO. Final recanalization was achieved treated in 15 patients. Three months after therapy, 12 of 16 patients were still alive; 7 of them had a good scan; outcome (modified Rankin score </=2). CONCLUSIONS: Our data suggest that the combination of IVT with on-demand consecutive EMT in BAO (EMT). is feasible, allows for early treatment, and provides excellent recanalization rates.

BACKGROUND:middle HMG-CoA-reductase-inhibitors (statins) exhibit pleiotropic beneficial effects on the vascular system including induction of endothelial nitric oxide synthase (eNOS) expression which (eNOS) is critical for vasodilation. Recent studies suggest a beneficial effect of statins on cerebral vasoreactivity in patients with cerebral small in vessel disease (SVD). CADASIL is a monogenic form of SVD caused by mutations in the Notch3 gene. Treatment options are beneficial limited and little is known about the therapeutic role of statins in CADASIL. METHODS: Twenty-four CADASIL subjects were treated with correlation atorvastatin for 8 weeks. Treatment was started with 40 mg, followed by a dosage increase to 80 mg after 4 was weeks. Transcranial Doppler sonography measuring mean flow velocity (MFV) in the middle cerebral artery was performed at baseline and the BACKGROUND: end of the treatment period. Vasoreactivity was assessed by hypercapnia and intravenous application of l-Arginine, which is the substrate for in eNOS. RESULTS: There was no significant treatment effect on MFV (p= .5) or cerebral vasoreactivity as assessed by hypercapnia (p= .5) and CADASIL intravenous l-Arginine (p= .4) in the overall cohort. However, an inverse correlation was found between vasoreactivity at baseline and changes of and both CO(2) and l-Arginine-induced vasomotor response (both p< .05). CONCLUSIONS: Short term treatment with atorvastatin resulted in no significant improvement of flow hemodynamic parameters in the overall cohort of CADASIL subjects.

BACKGROUND caused AND PURPOSE: The phenotypic expressivity shows striking variability among individuals with CADASIL (cerebral autosomal dominant arteriopathy with subcortical infarcts and and leukoencephalopathy), a small vessel disease caused by mutations in NOTCH3. However, little is known about the factors that underlie this search variability. We sought to quantify the contribution of modifying genetic effects to individual differences in the volume of cerebral ischemic shows lesions. METHODS: One hundred and fifty-one affected individuals (mean age+/-SD=45.7+/-10.4) from 95 unrelated families with CADASIL underwent MRI. The volume estimated of lesions visible on T2-weighted images and the intracranial volume (ICV) were quantified and vascular risk factors were assessed. Because ICV, of a skewed distribution, lesion volume measures were square-root transformed. Variance component methods were used to estimate the heritability of BACKGROUND lesion volumes (ie, the proportion of variation caused by additive genetic factors) after adjusting for covariates. RESULTS: In multivariate analyses,variability. higher age, a larger ICV, and a higher diastolic blood pressure were independently associated with a larger volume of T2-visible disease lesions (all P< .05). After adjustment for age the point estimate for the heritability of the square-root-transformed measure of T2 lesion from volume was .634 (SE=+/- .286). Adjustment for age, sex, ICV, and diastolic blood pressure increased the estimated heritability to .738 (SE+/- .255).volumes CONCLUSIONS: Heritability estimates in CADASIL suggest a strong modifying influence of genetic factors distinct from the causative NOTCH3 mutation on the the amount of ischemic brain lesions. These findings justify a systematic search for genetic variants that modify disease progression.

BACKGROUND:changes Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) is an inherited small vessel disease causing stroke and subcortical subcortical vascular dementia. Recent studies in sporadic subcortical ischemic vascular disease have drawn attention to brain atrophy as a clinically important seems marker of disease progression. However, little is known about the role of brain atrophy and its clinical correlates in CADASIL.and METHOD: The authors determined the normalized brain volume (NBV) and percent brain volume change (PBVC) over 2 years in 76 used CADASIL subjects (45.1 +/- 9.7 years) using the SIENA (structural image evaluation using normalization of atrophy) software and its adaptation model, for cross-sectional measurements (SIENAX). Baseline assessments included systolic blood pressure (SBP), homocysteine levels, BMI, and APOE genotyping. T2-lesion volumes and BACKGROUND: clinical scales were assessed at both time points. RESULTS: The NBV significantly correlated with all clinical scores (Rankin, NIH Stroke and Scale, Barthel, structured interview for the diagnosis of Alzheimer dementia and multi-infarct dementia, Mattis dementia rating scale) at both time interventional points independently of age and sex. PBVC correlated with changes of all clinical scores (all p < .01) except for of the Mattis dementia rating scale (p = .10). In a linear regression model, age (p < .001), male sex (p of < .01), and SBP (p = .07) were the main risk factors for a lower NBV at baseline. Age (p known < .001) and SBP (p = .01) were risk factors for brain volume loss during follow-up. Sample size estimates showed a that the number of individuals needed to demonstrate a treatment effect in a trial can be reduced when PBVC is Age used as an endpoint. CONCLUSIONS: This study identifies brain atrophy as an important aspect of the disease process in CADASIL clinical and establishes significant correlations with multiple clinical aspects including cognition. Age and systolic blood pressure are risk factors for brain (structural volume loss during follow-up. Percent brain volume change seems promising as an adjunct outcome measure in future interventional trials.

BACKGROUND with AND PURPOSE: Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) is a cerebral small vessel disease caused by the mutations in the NOTCH3 gene. MRI is sensitive in detecting preclinical involvement and changes over time. However, little is known Moreover, about correlations between MRI metrics and clinical measures on a longitudinal scale. In this study, we assessed the role of with quantitative MRI (T2-lesion volume and diffusion tensor imaging [DTI]-derived metrics) in monitoring and predicting disease progression. METHODS: Sixty-two CADASIL subjects trial were followed prospectively over a period of 26.3+/-1.2 months. Dual-echo scans, DTI scans, and clinical scales were obtained at baseline diagnosis and at follow-up. T2-lesion volumes were determined quantitatively, and histograms of mean diffusivity (MD) were produced. RESULTS: At follow-up, T2-lesion BACKGROUND volumes and MD histogram metrics had changed significantly (all P< .01). Lesion volumes and average MD correlated with clinical scores at clinical baseline. Changes of average MD correlated with changes of the Rankin score, the National Institutes of Health Stroke Scale score,in and the structured interview for the diagnosis of Alzheimer dementia and multiinfarct dementia score (all P< .01). On multivariate analysis, average followed MD and systolic blood pressure at baseline were predictors of changes of average MD during follow-up. Moreover, average MD was at the main predictor of clinical progression. Sample size estimates showed that the number of individuals required to detect a treatment about effect in an interventional trial may be reduced when using MD histograms as an end point. CONCLUSIONS: This study establishes detect correlations between changes of DTI histogram metrics and clinical measures over time. DTI histograms may be used as an adjunct over outcome measure in future therapeutic trials. Moreover, DTI histogram metrics predict disease progression in CADASIL.

OBJECTIVE:(Stroop Subcortical ischemic vascular lesions, which are closely related to small vessel disease, are a common substrate of cognitive impairment and dominant dementia. Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) is a monogenic variant of small vessel disease resulting with from mutations in NOTCH3. Mutation carriers almost invariably develop cognitive deficits and eventually dementia. The current study describes the profile closely of cognitive abnormalities in CADASIL subjects. METHOD: A cross-sectional study of 65 mutation carriers (mean age=47.3 years, SD=10.5) and 30 performance matched comparison subjects (mean age=47.2 years, SD=14. ) was conducted. Participants underwent a series of assessments that included ratings of global further cognition, the cognitive portion of the Vascular Dementia Assessment Scale, and specific tests of executive function and attention with measures OBJECTIVE: of processing speed and error monitoring. RESULTS: CADASIL subjects had pronounced impairments of the timed measures (Stroop II and III,develop Trail Making Test, symbol digit, digit cancellation). Measures of error monitoring (Stroop III, Trail Making Test, symbol digit, maze task)vascular were also significantly affected but to a lesser extent. Prominent deficits further included verbal fluency and ideational praxis. Recall, orientation,age=47.2 and receptive language skills were largely preserved. Subgroup analyses indicated a similar profile in subjects with early and advanced impairment digit, of global cognitive performance. CONCLUSIONS: The findings highlight processing speed as the most substantial area of cognitive impairment in CADASIL mutations subjects, with less pronounced yet significant deficits in other aspects of executive performance and attention. This profile of cognitive impairment yet is present at an early stage and enables the construction of targeted test batteries for clinical trials. It is hypothesized is that the profile of dysfunction described here represents the core of the cognitive syndrome associated with small vessel disease and deficits subcortical ischemic vascular lesions.