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Researchers found that scented cleaners can react with ozone indoors to create billions or trillions of invisible nanoparticles that can penetrate deep into the lungs. The pollution forms within minutes and, in some cases, may produce an inhaled particle dose comparable to or greater than standing near heavy traffic.

Tirzepatide, sold as Mounjaro and Zepbound, activated calorie-burning brown fat in obese mice, revealing a potential metabolic effect beyond appetite suppression. If confirmed in humans, the finding could help explain the drug’s powerful benefits and inspire more comprehensive treatments for obesity and diabetes.

Scientists discovered a surprising energy paradox in the brain during REM sleep, the stage most closely associated with dreaming. Blood supply to the brain begins increasing even before REM starts, but neurons’ immediately available energy, measured as ATP, then drops. The finding suggests that dreaming may require such intense internal processing that neurons consume energy faster than it can be replenished.

Alzheimer's disease (AD) is the most prevalent neurodegenerative disorder, and dysfunction of triggering receptor expressed on myeloid cells 2 (TREM2) in microglia increases AD risk. TREM2 activation promotes protective microglial functions and mitigates AD pathology. Although TREM2-activating antibodies show therapeutic potential, the mechanisms underlying TREM2-mediated rescue effects remain unclear. Here, we show that two TREM2-activating single-domain antibodies (sdAbs), 10C11 and 10E12,...

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CONCLUSION: Evidence on cognitive ageing among older Latin American immigrants remains limited and geographically concentrated. Greater research diversity and more precise characterisation of immigrant populations are needed to better understand cognitive ageing and to inform equitable, culturally responsive policies and interventions.

Despite comprising nearly one in 10 people living with HIV (PLHIV) in Brazil, older adults aged 60 years and above remain profoundly underrepresented in psychosocial research. This multicenter study is the first age-restricted (≥ 60 years) subgroup analysis of the Brazilian PLHIV Stigma Index 2.0. The present secondary analysis yielded a sample of 138 older adults (M age = 64.3 years, SD = 4.1; 52.9% male; 57.2% Black or Brown). Path analysis with 5000-resample bootstrapping and full-information...

CONCLUSIONS: Among older adults, smoking and ingested forms were associated with CUD, whereas no mode was associated with depression, distress, or suicidal ideation. These findings may inform targeted screening and harm reduction strategies for adults aged ≥ 65 years using cannabis.

Perilla frutescens (PF) is rich in flavonoids and other secondary metabolites with antioxidant properties. This study explored the lifespan-modulating effects and underlying mechanisms of an ethyl acetate extract of PF leaves (EAEPF) using Caenorhabditis elegans (C. elegans) as a model organism. EAEPF treatment significantly prolonged lifespan, enhanced pharyngeal pumping and head thrashing frequencies, and reduced the accumulation of lipofuscin and reactive oxygen species (ROS). The extract...

Motor changes are increasingly recognized as part of the Alzheimer's disease (AD) phenotype, yet motor speech function and its clinical utility for early AD risk stratification remain underexplored. This cross-sectional study investigated whether measures of motor speech performance in home-based rapid syllable repetition (diadochokinesis [DDK]) tasks are associated with the established AD risk indicators of subjective cognitive decline (SCD), apolipoprotein E ε4 (APOE ε4) carriage, and plasma...

Aging is the primary risk factor for neurodegenerative disease, yet the protein signatures that distinguish physiological brain aging from pathological decline remain incompletely defined in translational models. Using the targeted NULISAseq proteomic platform, we profiled cerebrospinal fluid (CSF) and plasma from 66 rhesus macaques (Macaca mulatta) spanning adult, pre-geriatric, and geriatric ages, and benchmarked the results against human reference samples. Age-related differences were broader...

The neuromuscular junction (NMJ) is a dynamic synapse whose structure and function change with activity. This review synthesizes evidence from molecular studies, in vivo imaging, computational models, and human exercise research to explain how exercise remodels the presynaptic motor neuron terminal, postsynaptic muscle endplate, perisynaptic Schwann cells (PSCs), and extracellular matrix (ECM). Three conclusions emerge. First, endurance, resistance, high-intensity interval training (HIIT), and...

The aging brain undergoes progressive alterations in energy metabolism that may reduce its capacity to match energy supply with changing functional demands. Declining glucose metabolism, mitochondrial dysfunction, and altered neuron-glia and neurovascular interactions may contribute to this vulnerability, but these changes do not necessarily indicate complete loss of metabolic capacity. Neuroenergetic flexibility refers to the capacity to coordinate changes in substrate utilization with...

The accumulation of senescent cells is a recognized hallmark of biological aging and is associated with the onset of multiple chronic medical conditions. Senescent cells exhibit a distinct secretory profile, known as the senescence-associated secretory phenotype (SASP), which can propagate cellular senescence to neighboring and distant tissues. Measuring SASP factors in blood serves as a practical proxy for cellular senescence burden and may help track disease states and intervention outcomes....

Aging drives physiological decline and predisposes individuals to multiple age-related pathologies, constituting a major global health challenge. Growth hormone receptor (GHR), a critical regulator of growth, development, and metabolism, has emerged as a potential therapeutic target. However, its precise role in aging and age-related diseases remains incompletely defined. Here, we demonstrate that hepatocyte-specific GHR knockout mice display accelerated aging-related phenotypes, characterized...

Scientists discovered rare flavoalkaloids in Cannabis leaves for the first time, along with dozens of other phenolic compounds that had never been reported in the plant. The findings suggest that Cannabis leaves, often discarded as waste, may contain a surprisingly rich source of potentially useful chemicals.

A major analysis suggests Phelan-McDermid syndrome, a genetic disorder closely linked to autism, may affect about 1 in 7,300 people and more than 45,000 Americans. Researchers warn that thousands of cases may remain hidden because genetic testing is often not performed, even as targeted treatments move into clinical trials.

Researchers used CRISPR to remove CD33 from donor stem cells, potentially giving doctors a way to attack aggressive blood cancers without destroying the healthy cells patients need after a transplant. In a 30-patient trial, the edited cells successfully took hold and appeared to shield blood cells from a CD33-targeted cancer treatment.

Imminent change in legal status raises concerns that national academy will serve political interests

First clean pictures from a muon beam point to a new way to peer inside suspicious packages and ancient structures