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Category: biotech/medical – Page 90

Scientists identify fructose as a surprise driver of cancer spread

A new study from The Wistar Institute has uncovered an unexpected link between fructose—a common dietary sugar—and the spread of an aggressive form of ovarian cancer. Published in Nature Aging, the study found that cancer cells not killed by chemotherapy send signals to neighboring tumor cells, helping them become more capable of spreading.

The researchers identified fructose as a key messenger in this process, revealing a previously unrecognized way that treatment-surviving cancer cells may promote the spread of cancer.

“Some cancer cells that survive chemotherapy aren’t dividing anymore, but they’re still biologically active,” said Aidan Cole, a postdoctoral fellow in the lab of Katherine Aird at The Wistar Institute and first author of the study. “Instead, they continue to release molecules that send signals to nearby cells. Our study is among the first to show that a nutrient—in this case, fructose—can act as one of those signals.”

All living things emit a faint glow. Could this light be useful?

An interesting report on the phenomenon by which cells and organisms glow very faintly, primarily due to energy transitions during aerobic respiration. Speculation on biological functions and future applications are covered.

Ultra-weak ‘biophotons’ might be used to diagnose disease, or could even represent a new signalling mechanism in cells.

Researchers Simulate Alzheimer’s Progression Across the Entire Brain

This hypothesis has led to a new “whole-brain” mathematical and computational model developed at the MOX Laboratory of the Department of Mathematics of Politecnico di Milano. The model is designed to describe in an integrated way the interaction between the spread of amyloid beta and the functioning of the cerebral vascular network. The aim is to provide a tool capable of simulating, on the scale of the whole organ, how small biological or vascular alterations can evolve over time and contribute to neurodegeneration. The model and the accompanying scientific study have been published in the prestigious scientific journal Computer Methods in Applied Mechanics and Engineering.

The model integrates two scales of analysis. On the one hand, it describes the dynamics of the production, transformation, diffusion and elimination of the healthy and pathological forms of amyloid beta. On the other, it describes blood flow through a “macroscopic” description of arteries, capillaries and veins, treating brain tissue as a porous medium perfused by blood vessels, through a macroscopic compartmental model. The two components are then connected to represent the possible mechanism of mutual reinforcement between protein accumulation and vascular dysfunction.

The simulations show a particularly relevant result: the brain can evolve into different states depending on the initial conditions. Small localised amounts of amyloid beta can be eliminated, allowing the system to return to a healthy state. Conversely, larger amounts can trigger a self-sustained spread of the pathology at brain scale.

Quantum in the palm of your hand: The evolution of superconducting qubits

Electrons zipping through transistors, powering the screens on our smartphones. Light zooming from distant stars to Earth, moving faster than anything else in the universe. Protons enabling MRI machines to analyze people’s injuries.

Quantum mechanics explains the behavior of subatomic particles like electrons, photons and protons. In contrast to classical physics that we can observe with our senses, particles in the quantum realm have unusual behaviors. Even though quantum particles make common technologies possible, we don’t experience these behaviors in our everyday world.

That’s why a discovery in 1985 was such a big deal. In a laboratory at the University of California, Berkeley, a team of three scientists showed that a system you could see could demonstrate quantum behavior. Or as they said in one of the journal articles covering the experiments, the system was “big enough to get one’s grubby fingers on.”

Unzipping the Code of Life: Scientists Pinpoint Where DNA First Opens

Researchers mapped where DNA first opens and how a helicase gate may release one strand as genome copying begins.

Before a cell can divide, it must open its tightly wound DNA and begin copying the entire genome. Researchers at the MRC Laboratory of Medical Sciences (LMS) and collaborating institutions have now traced this process to one of its earliest moments, revealing where DNA first separates inside living cells and identifying a molecular gate that helps launch replication.

Published in Nature Communications, the findings provide a closer view of how cells begin duplicating their genetic material. Because copying errors can damage the genome, the start of DNA replication must be controlled with exceptional precision.

Loneliness Is Making People Sick — but Medicine Can’t Fix It Alone

Treating loneliness as a health issue may encourage action while obscuring the broader social conditions behind it.

Loneliness can damage health, but a healthcare system cannot rebuild communities or restore the social connections people have lost. A University of Michigan study warns that defining loneliness mainly as a medical concern may shift responsibility away from the wider social conditions that produce isolation.

Published in Social Problems, the research traces how chronic loneliness and social isolation became widely recognized as public health issues after studies connected them with greater risks of illness, premature death, and increased healthcare spending.

Beyond wrinkles: New rule explains why growing shapes suddenly crumple

Scientists have discovered a previously unknown law of geometry that explains why some growing surfaces, whether in nature or in engineered materials, suddenly stop being able to stay smooth and instead form dimples and folds. Until now, researchers believed they understood the geometric rules behind these shape changes, but this study reveals a new kind of “geometric frustration” that arises even when all the known rules are satisfied.

The finding could reshape how scientists understand the formation of leaves, flowers, tissues and other natural structures while helping engineers design smarter materials that can deliberately change shape for applications in soft robotics, medicine and advanced manufacturing.

Brain Dramatically Remodels Its Cellular Composition, Starting in Midlife

The aging human brain is fascinating, because in some ways, it improves with age – but we generally hear more about how it declines. That’s understandable!

After all, there are a host of neurodegenerative diseases that none of us want to end up with.

Previous research has shown that some of the seemingly inevitable declines in brain health, often seen in 70-and 80-year old brains, start in midlife.

Longterm outcomes in IDHwildtype (IDHwt) gliomas with historical WHO grade 2 and 3 histology NeuroOncology

A total of 134 patients were included, with a median follow-up of 29.8 months. Median OS was 35 months (95% CI: 28.8–43), and median PFS was 20.9 months (95% CI: 14.5–27.4). Grade 2 tumors demonstrated significantly improved outcomes compared to grade 3 tumors (median OS 94.5 vs. 29.8 months; median PFS 50.6 vs. 15.3 months). Among grade 3 tumors, sequential radiation and chemotherapy yielded a median OS of 29.8 months versus 29.8 months with concurrent chemoradiation followed by chemotherapy (p = 0.17); median PFS was 22.2 months versus.

IDH-wt gliomas with grade 2–3 histology have heterogeneous outcomes. Grade 3 tumors show survival comparable to molecular glioblastoma, while a subset of grade 2 tumors exhibit prolonged survival. Concurrent chemoradiation did not confer a survival advantage over sequential therapy in grade 3 tumors, supporting reevaluation of treatment intensity in selected patients.

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