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La firma acompaña a una fórmula matemática que sincroniza calendarios con movimiento de planetas

A newly discovered network of fine hairs and specialized nerve cells appears to form a dedicated system for sensing mechanical itch, offering fresh insight into why chronic itching occurs. Because humans show signs of having the same pathway, the research could pave the way for more effective treatments for conditions such as eczema.

Researchers have discovered that the retina uses an unexpected communication network that lets separate visual pathways cooperate instead of working alone. A newly identified "commander" cell appears to coordinate this system, helping the eye detect faint details that might otherwise be missed.

Exercise doesn't just make the heart stronger. It also rewires the nerves that regulate it, a discovery that could pave the way for more personalized treatments for common heart conditions such as arrhythmias and angina.

Sleeping about an hour and 20 minutes less each night for six weeks caused participants to gain weight and spend more time inactive. Researchers found that even mild, realistic sleep loss, similar to what many adults experience, had measurable effects. They warn that if this pattern continues over months or years, the health consequences could become much more significant, including a higher risk of diabetes and heart disease.

A new study suggests the brain begins making decisions much earlier than scientists previously thought. Researchers found that even primary sensory regions are influenced by higher brain areas through rapid feedback loops, rather than simply passing information forward. This more dynamic view of brain function could help engineers design future AI systems that think more like biological brains while using far less power.

An unexpected study found that young non-smokers with healthier diets had higher rates of lung cancer, raising questions about whether pesticide exposure from conventionally grown produce could play a role. Researchers stress that the findings are preliminary and require further studies before any conclusions can be drawn.

Researchers analyzing data from more than 214,000 people found that dementia risk factors differ widely across countries, challenging the idea of a one-size-fits-all prevention strategy. At the same time, they uncovered surprisingly consistent patterns that could help shape smarter, more targeted public health efforts.

Alzheimer's disease (AD) is a neurodegenerative disease characterized by progressive impairments in episodic and spatial memory, as well as circuit and network-level dysfunction. While functional impairments in medial entorhinal cortex (MEC) and hippocampus (HPC) have been observed in patients and rodent models of AD, it remains unclear how communication between these regions breaks down in disease, and what specific physiological changes are associated with the onset of memory impairment. Here,...

BACKGROUND: Latin America faces a high dementia burden, with increased prevalence of factors associated with cognitive decline. Multidomain lifestyle interventions might delay cognitive decline, but populations from Latin America remain under-represented in dementia prevention trials. We aimed to investigate the feasibility of a culturally adapted, multidomain, systematic lifestyle intervention and investigate its effects on global cognitive function in at-risk older adults (aged 60-77 years).

Astrocytes have traditionally been cast as supportive glia, but they are increasingly recognized as metabolic hubs that regulate cholesterol synthesis, fatty acid detoxification, lipid droplet dynamics and redox homeostasis in the CNS. Neurons have a limited intrinsic capacity for lipid storage and detoxification and rely heavily on astrocytes to maintain a safe lipid environment. Emerging evidence indicates that dysregulation of astrocytic lipid homeostasis precedes overt neuronal degeneration...

Aging is accompanied by both increasing interindividual heterogeneity and systematic, age-associated alterations in DNA methylation (DNAm). Here, we investigated these complementary dimensions of epigenetic aging in dogs using global and locus-specific measures of epigenetic drift alongside clock-based estimates of biological aging. We observed pervasive, yet genomically structured epigenetic instability throughout the canine lifespan. The extent of age-associated epigenetic drift further varied...

Cytosolic DNA and RNA sensing is crucial for innate immunity, playing essential roles in pathogen defense and autoinflammation induction. We reported the endogenous metabolite flavin adenine dinucleotide (FAD) as a molecular brake restraining both cytosolic DNA and RNA sensing. It bound directly to cytosolic nucleic acid sensors cyclic GMP-AMP synthase (cGAS) and retinoic acid-inducible gene I (RIG-I), occupying catalytic pockets to suppress their activity and downstream immune responses....

BACKGROUND: Latin America faces a high dementia burden, with increased prevalence of factors associated with cognitive decline. Multidomain lifestyle interventions might delay cognitive decline, but populations from Latin America remain under-represented in dementia prevention trials. We aimed to investigate the feasibility of a culturally adapted, multidomain, systematic lifestyle intervention and investigate its effects on global cognitive function in at-risk older adults (aged 60-77 years).

Vascular aging contributes to systemic dysfunction and underlies many age-related diseases, driven by structural and functional changes across various cell types, including endothelial cells, vascular smooth muscle cells, pericytes, and cardiomyocytes. This review highlights experimental models that facilitate mechanistic insights and the development of novel therapeutic approaches for vascular aging, emphasizing both in vitro and in vivo methodologies. This review discusses in vitro models...

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Sustained attention is a core cognitive function, frequently declines with age and neurological disease, and is highly relevant for functional outcomes in geriatric populations. Electroencephalography (EEG) offers high temporal resolution for assessing attentional processes, but its feasibility in multimorbid geriatric inpatients remains insufficiently characterized. This study evaluated the procedural and methodological feasibility of EEG-based sustained-attention assessments in geriatric...

Aging is often framed as the gradual erosion of proteostasis, driven by declining chaperone capacity, impaired degradation, and dysregulated protein synthesis. Yet this view implicitly assumes that proteins fail primarily because they misfold or escape clearance. Increasing evidence instead points to a more fundamental problem: aging disrupts the spatial management of the proteome. Gradually, proteins are misplaced, signaling pathways are uncoupled from their compartments, and condensates that...

CONCLUSIONS: Findings underscore the importance of emotionally engaging and expectation-aligned services in mitigating social isolation, with extended services generating the most durable benefits. Strengthening HCBS to address psychosocial and physical needs may support aging-in-place and inform responsive community-based care systems in China and beyond.

With an ageing population and the persistence of unhealthy lifestyle behaviours, health-care systems are challenged by a growing number of individuals living longer with cardiovascular disease and its sequelae. The evolution of cardiac rehabilitation, from a group exercise-based programme to encompassing all aspects of secondary prevention, has led to the ultimate objective of achieving lifelong cardiovascular health for all. In this World Heart Federation Roadmap, we present a united and...