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Perivascular Spaces Are Associated with Cognition

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Perivascular Spaces Are Associated with Cognition RESEARCH HIGHLIGHTS STROKE IN briEF A role for double-negative T cells PARKINSON DISEASE in p os t- st roke n eu ro in flammation Increased α-synuclein levels in patients with sleep apnoea might be involved in PD pathogenesis A new study has identified a key patients following ischaemic stroke. role for CD3+CD4–CD8– T cells, also Analysis of post-mortem brain slices Plasma levels of α-synuclein — aggregates of which are the pathological hallmark of Parkinson disease (PD) — are increased known as double-negative T cells from patients with stroke revealed in patients with obstructive sleep apnoea syndrome (OSAS) and (DNTs), in neuroinflammation after accumulation of DNTs in the ischaemic correlate with the degree of hypoxia, according to a new study. ischaemic stroke. Yu Xu and colleagues penumbra — that is, the at-risk but not Sun et al. measured total and phosphorylated α-synuclein at Nanjing University in China found yet infarcted tissue surrounding the levels in 42 patients with OSAS and 46 age-matched and evidence of DNT involvement in post- ischaemic core. The DNTs were found gender-matched controls who had simple snoring. Total stroke neuroinflammation in patients to colocalize with pro-inflammatory and phosphorylated α-synuclein levels were significantly higher in patients with OSAS than in controls and correlated and animal models, and they suggest microglia in this region. positively with the apnoea–hypopnoea index and the oxygen that these cells could provide a target In a mouse model of stroke, desaturation index. Total and phosphorylated α-synuclein for novel stroke therapies. Xu and colleagues observed that the levels were negatively correlated with mean and lowest “Previous studies assessing the infiltrating DNTs expressed increased oxyhaemoglobin saturations. Previous studies suggest that mechanism by which T cells regulate levels of the anti-inflammatory protein OSAS is a risk factor for onset of PD; the authors say their immune and inflammatory responses PTPN2 and reduced levels of the findings indicate that chronic hypoxia increases α-synuclein levels and might be involved in the pathogenesis of PD. in the brain during stroke have mainly pro-inflammatory cytokine TNF. In focused on CD4+ helper and CD8+ co-culture experiments in vitro, PTPN2 ORIGINAL ARTICLE Sun, H.-L. et al. Plasma α-synuclein levels are increased in patients with obstructive sleep apnea syndrome. Ann. Clin. Transl Neurol. https://doi.org/10.1002/ cytotoxic T cells, which comprise inhibition in DNTs increased the acn3.756 (2019) ~95% of T cells,” the authors write expression of TNF and promoted in the new paper. “Despite DNTs the activation of pro-inflammatory MOTOR NEURON DISEASE accounting for a small percentage microglia. (1–5%) of T cells in the peripheral “These data reveal that infiltrating Arginine dimethylation is increased in patients with blood and lymphoid organs, they play DNTs are the critical driving force ALS and can predict disease progression important roles in many diseases.” in promoting microglia-mediated Patients with amyotrophic lateral sclerosis (ALS) have increased The researchers found that levels neuroinflammation and ischaemic arginine dimethylation, and an asymmetrical dimethylarginine (ADMA) to l- arginine ratio could be a predictor of prognosis, of DNTs were elevated in the blood of brain injury,” the authors conclude. say researchers. Ikenada and colleagues report that the immunoreactivity of protein arginine methyltransferase 1 (PRMT1) and its products in post-mortem spinal cord was CEREBROVASCULAR DISEASE increased in cord from four patients with ALS compared with cord from four patients without ALS. They also found that the concentration of ADMA in cerebrospinal fluid was significantly higher in 52 patients with ALS than in 21 controls. The team also Perivascular spaces are showed that the ADMA to l- arginine ratio correlated with the rate of decline in the ALS Functional Rating Scale and that the ratio was an independent predictor of overall survival. A high associated with cognition ADMA to l- arginine ratio was a predictor of poor prognosis. Perivascular spaces (PVS) are a marker of small vessel disease, including white ORIGINAL ARTICLE Ikenada, K. et al. Increase of arginine dimethylation correlates with the progression and prognosis of ALS. Neurology https://doi.org/10.1212/ of cognition in older adults without matter hyperintensities (WMH), PVS, WNL.0000000000007311 (2019) dementia, and might operate through cerebral microbleeds (CMBs) and a unique pathway of injury, according lacunes, were assessed by MRI. to a new study. “We found that each marker MULTIPLE SCLEROSIS “Small vessel disease markers are of small vessel disease related to Dimethyl fumarate is more effective than largely thought to reflect ischaemic cognitive activities in some way,” says teriflunomide in preventing relapse in RRMS changes in the brain,” explains Jefferson. “As expected, the most A new study reports that dimethyl fumarate might be more corresponding author Angela frequent associations we saw were effective than teriflunomide in preventing relapses in patients Jefferson. “However, there is a great between WMH and cognition, including with relapsing–remitting multiple sclerosis (RRMS). The study need to better understand the language, information processing speed, by Buron et al. included 2,236 patients with RRMS — 1,469 degree of pathological overlap in executive functioning and visuospatial on teriflunomide and 767 on dimethyl fumarate. Annualized these markers, and importantly, their skills. Unexpectedly, the next most relapse rates were lower among patients on dimethyl fumarate clinical significance.” frequent associations were between than among those on teriflunomide (0.09 versus 0.16). Relapse- The study included 327 older adults enlarged PVS and information processing free survival rate after 48 months of follow-up was significantly greater in patients on dimethyl fumarate, and the incidence of (mean age 73 years) without dementia. speed and executive functioning.” CMBs discontinuation due to disease breakthrough was lower in the Participants underwent a detailed and lacunes were associated with fewer dimethyl fumarate group (10.2% versus 22.1%). The results were neuropsychological assessment to cognitive measures than expected. similar after adjustment for the potential confounding effects assess global cognition, language, “We also wanted to know whether of baseline MRI T2 lesion number. visuospatial skills, information these imaging markers overlapped ORIGINAL ARTICLE Buron, M. D. et al. Comparative effectiveness of teriflunomide processing speed, executive function in their association with cognition, and dimethyl fumarate: a nationwide cohort study. Neurology https://doi.org/10.1212/ and episodic memory. Various markers suggesting a common pathway of WNL.0000000000007314 (2019) 246 | MAY 2019 | VOLUME 15 www.nature.com/nrneurol.
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