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Efficacy of Pyridostigmine in Myasthenia GravisA Randomized, Double-Blind, Placebo-Controlled Crossover Trial
Class I evidence that, in adults with AChRAb+ ocular or generalized myasthenia gravis (MG) on stable standard-of-care therapy and currently using pyridostigmine, pyridostigmine improves MG symptoms compared with placebo.
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Middle-Aged Carotid Plaque and Cognitive Functions in Later LifeA Population-Based Study
In this large cohort study, carotid plaque status at baseline was independently associated with in cognitive function decline, especially in nonverbal memory and executive functioning over 8-year follow-up period in the general population.
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White matter injury may lead to neurodegeneration
The brain is equally divided into grey and white matter. Grey matter contains the brain’s processing hubs, linked by an information highway — the white matter. Although white matter damage is a defining feature of multiple sclerosis and is also seen in neurodegeneration including Alzheimer’s and Parkinson’s disease, the consequences of white matter damage are not well understood.
The team created localised damage to myelin – the main component of white matter – in a well-defined brain circuit and followed what happened over time. They found that small, localised myelin damage triggered a striking response in a connected, remote grey matter region. Neuronal activity fell, microglia – the brain’s immune cells – became activated, and connections between neurons were lost.
Crucially, these changes were not permanent. After myelin was regenerated, neuronal activity recovered, connections between neurons returned, and the inflammatory response subsided.
The study also challenges a common assumption about brain inflammation. Grey matter inflammation is traditionally viewed as harmful. But here, the team found that this transient response was part of the repair process itself. When they prevented grey matter inflammation, myelin regeneration was impaired.
Conversely, when the team blocked myelin regeneration, the grey matter response did not resolve and instead became chronic. This suggests that failed myelin regeneration may help drive the persistent low-grade inflammation seen in neurodegenerative disease. ScienceMission sciencenewshighlights.
Damage to white matter in the brain can trigger features associated with neurodegenerative disease, The researchers have discovered in a new study published in the journal Nature.
NASA Research Shows Early Life Relied on Rare Metal
NASA-funded scientists have discovered that life on Earth over 3 billion years ago relied on the metal molybdenum, which was incredibly scarce in the environment at the time. The study, published in Nature Communications on Tuesday, is the first to show that molybdenum was used by ancient life this far back in our planet’s history.
On Earth today, molybdenum helps speed up vital biochemical reactions in cells. The metal is a component of essential enzymes that drive several major biological reactions in organisms. This is not only important for the individual organisms, but also biogeochemical cycles, such as the nitrogen cycle, which affect our entire planet. Without molybdenum, those important reactions could still happen in nature, but they would be too slow to sustain life.
“Molybdenum sits at the catalytic center of enzymes that run major carbon, nitrogen, and sulfur reactions,” explained Betül Kaçar, head of the Kaçar Lab at the University of Wisconsin-Madison and senior author on the study. Kaçar leads MUSE, a NASA Interdisciplinary Consortia for Astrobiology Research (ICAR) at UW-Madison.
The role of noradrenergic innervation and β-cell dedifferentiation in diabetes
Noradrenergic innervation and β-cell dedifferentiation in diabetes.
Dedifferentiation, a survival mechanism whereby mature β-cells revert to a nonfunctional state under metabolic stress, represents a fundamental driver of β-cell failure in type 2 diabetes.
Dedifferentiation is reversible, primarily through dietary intervention or bariatric surgery, and redifferentiation may promote type 2 diabetes remission.
Noradrenergic fiber density is increased in diabetic pancreases and correlates with β-cell dedifferentiation, suggesting that altered signaling may trigger the process.
A link between diet, redifferentiation, reduction of noradrenergic fibers, and type 2 diabetes remission has been hypothesized.
The review proposes that targeting pancreatic noradrenergic innervation could be a novel therapeutic strategy to reverse β-cell dedifferentiation, restore insulin function, and achieve type 2 diabetes remission. sciencenewshighlights ScienceMission https://sciencemission.com/noradrenergic-innervation–in-diabetes