A tiny jellyfish found in the ocean possesses an extraordinary ability to reverse its life cycle. This creature can transform from an adult back to a polyp, essentially resetting its biological clock. Scientists are studying its DNA to understand this process. This discovery offers new insights into aging and regeneration, potentially impacting future medical research.
Abstract. The heart, a vital organ, works without interruption and constantly adjusts to the ever-changing demands on our body. It adapts to physiological and pathological changes, including exercise and emotional state, as well as metabolic, respiratory, and vascular abnormalities. The pumping action of the heart is determined by the health of the myocardium, which undergoes changes with ageing that are both under-investigated and incompletely understood, potentially impacting our approach to pathological conditions. Here, the alterations in cellular, tissue, and gross physiological function of the heart with age are discussed. At the molecular level, non-coding RNAs influence cellular senescence, and extracellular vesicles induce fibrosis through matrix remodelling. Mitochondrial dysfunction and altered fatty acid oxidation reduce cellular energetics, whilst accumulation of reactive oxygen species and steatosis, as well as telomere shortening coupled with reduced autophagy, limit the myocardium’s regenerative capability. Loss of cardiomyocytes, combined with senescence, requires compensatory hypertrophy, inducing myocardial stiffness and altered muscle function. In addition to these direct alterations in myocardial characteristics with ageing, other factors that can affect the myocardium indirectly are addressed, including valve calcification, resulting in regurgitation and/or stenosis; vascular abnormalities, reducing compliance and exacerbating hypertension; fibrosis leading to cardiac arrhythmias; and autonomic dysregulation, reducing cardiac adaptability. Finally, potential modulation of cardiac ageing is discussed whilst also addressing which senescent modifications should be considered as ageing-related physiological changes of the myocardium. A better understanding of myocardial ageing will differentiate physiological changes from early, preventable, and reversible pathological changes, consequently helping to optimize management of individuals with or at risk of myocardial disease by taking into account diverse trajectories of myocardial ageing.
Characterizing molecular aging features is crucial for understanding systemic and local factors contributing to the aging process. Here Costa, Chen et al. performed RNA sequencing on 13 tissues across six ages in male and female African turquoise killifish. This sex-balanced killifish aging atlas provides a comprehensive resource for studying aging dynamics across tissues in the killifish—a powerful, short-lived vertebrate model of aging.
Building functional human muscle in the laboratory has long been a goal of regenerative medicine, but one stubborn obstacle remains: real muscle is not just a mass of cells. Its strength and function depend on exquisitely ordered myofibers, all aligned in precise directions that vary from one muscle to another. Reproducing that internal order has proved far harder than shaping muscle tissue into the right external form.
Published in the International Journal of Extreme Manufacturing, a research team from Xi’an Jiaotong University has now found a way to solve both problems at once. By using electric forces during the electrohydrodynamic bioprinting process, they have created living muscle tissues whose cells naturally line up just as they do in the human body, showing how electric forces can be used not just to precisely bioprint tissue, but to quietly instruct cells how to organize themselves.
Skeletal muscles come in many forms. Some fibers run in long, parallel bundles that power our arms and legs. Others curve or fan out, helping us grip, chew or control movement with precision. Despite these differences, all muscles share a common microscopic feature: their cells are highly aligned. This alignment allows individual muscle cells to fuse into long fibers and contract efficiently. Without it, muscle tissue is weak and poorly functional.
Solving Job Loss, and the Future of Work ## Andrew Yang advocates for the implementation of Universal Basic Income (UBI) as a necessary solution to address job loss, income inequality, and societal unrest caused by technological advancements and AI-driven changes in the economy ## ## Questions to inspire discussion.
Universal Basic Income Implementation.
🔹 Q: What UBI amount should be set to provide an effective safety net?
A: UBI should be set at twice the poverty level, around $25,000 per person per year, providing enough for survival but not happiness to maintain work incentives while protecting against economic collapse.
🔹 Q: How can UBI be funded without government action initially?
A: Well-resourced tech billionaires could fund UBI directly to local communities to keep the middle class afloat during AI-driven changes, potentially catalyzing further philanthropy and government action.
Senescent “zombie” cells accumulate as we age, releasing inflammatory signals that damage surrounding tissue. Senovax takes a novel approach: train the immune system to recognize these cells and eliminate them. By exposing dendritic immune cells to lab-generated senescent cells, the body learns the markers that identify aging cells. The result: the immune system creates a “wanted poster” and begins targeting senescent cells throughout the body. Unlike drugs that must reach specific tissues, the immune system already travels everywhere — and it remembers. One treatment could potentially provide long-lasting protection.
Immunosenescence represents a critical aspect of the aging process. Centenarians, serving as a nature model of “healthy aging,” demonstrate a distinctive immune “compensatory adaptation” mechanism that contributes to the maintenance of immune homeostasis. However, the specific immune cell subsets involved and the molecular mechanisms underlying these phenotypic traits remain incompletely understood. In this study, we integrated single-cell RNA sequencing data spanning the entire lifespan of East Asian populations with bulk transcriptomic data from a centenarian cohort in Guangxi. Utilizing the Scissor algorithm, we identified immune cell subpopulations positively (Scissor+) and negatively (Scissor−) associated with longevity phenotypes, thereby constructing an immune cell atlas of “Longevity Molecular Tag.” Our findings indicate that Scissor+ cells predominantly comprise natural killer (NK) cells, CD8+ T cells, and γδ T cells, characterized by enhanced cytotoxic and immunomodulatory functions. Conversely, Scissor− cells mainly include CD4+ T cells, B cells, and dendritic cells (DCs), which are linked to inflammatory signaling pathways and Th17/Th1 differentiation. Trajectory analysis elucidated the differentiation pathways of NK, CD8+ T cells, CD4+ T cells, and B cells. Differentially expressed genes were enriched in pathways such as NF-κB signaling, T cell receptor signaling, and NK cell cytotoxicity. Furthermore, co-localization analysis revealed five eQTL-colocalized events (rs3793537–GLIPR2/CD72/TLN1 and rs8019902–TRDV2/TRDC) associated with longevity. Collectively, these results suggest that centenarians achieve immune equilibrium by remodeling cytotoxic immune lineages and finely tuning inflammatory responses, thereby promoting health span and longevity. This study offers novel insights into potential strategies for modulating immunosenescence.
As global human life expectancy continues to rise, accompanying increases in healthspan that prevent morbidity expansion become increasingly imperative. Population lifespan can increase in distinct ways, for instance through rectangularisation (steepening) or triangularisation (flattening) of survival curves. These two demographic changes, particularly rectangularisation, occur frequently across human and model organism populations, yet their biological determinants and effects on healthspan and morbidity are largely unknown. Notably, these modes of life-extension occur when parameters of the Gompertz mortality model (capturing exponential age-increases in mortality rate) change inversely, a widely-reported phenomenon known as the Strehler-Mildvan correlation — whose biological basis also remains unexplained. We therefore investigated longitudinal health, morbidity and lifespan in 30 Caenorhabditis elegans cohorts using multiple life-extension protocols. We report that survival curve rectangularisation results from healthspan expansion in short-lived population members, whereas triangularisation from healthspan and morbidity expansion in long-lived population members. Interestingly, rectangularisation and triangularisation respectively decrease and increase inter-individual variation in the ageing process, and the mode of life-extension that occurs depends on levels of existing variation. Notably, triangularisation was more effective at extending lifespan without morbidity expansion. Analysis of fruit fly and mouse data show that these biological determinants of the Strehler-Mildvan correlation are also largely evolutionarily conserved.
Cyclin D-binding myb-like transcription factor 1 or DMTF1a key protein in the brain can help to regenerate neural stem cells and improve aging-associated memory decline. NUS scientists found that this protein’s levels are repressed in the “aged” neural stem cells, Health & Wellness News, Health and Me