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Comment by Dr. Krishna Kumari Challa 7 hours ago

Childhood cancers may spread by 'shape-shifting' rather than mutating

A review proposes that some childhood cancers spread through reversible changes in cell state without acquiring additional mutations. Changes in gene activity may exploit developmental flexibility to enable metastasis and treatment resistance. The model requires further validation and does not establish a new treatment.

Developmental plasticity as a framework for paediatric cancer metastasis, Trends Open (2026).

Comment by Dr. Krishna Kumari Challa 7 hours ago

Researchers reveal how inhaled nanoplastics trigger lung inflammation

Everyday plastic products, including water bottles, disposable cups and packaging, can break down over time into tiny fragments known as nanoplastics. These particles are invisible to the naked eye and can become airborne, raising concerns about their potential to reach deep into the lungs when inhaled.
The researchers prepared PE and PP nanoparticles and compared their effects with those of diesel exhaust particles. Using a mouse model in which particles were delivered directly into the trachea, they evaluated lung inflammation and investigated the biological processes underlying the response.

Both types of nanoplastics caused acute lung inflammation. Importantly, their relative inflammatory potency depended on how the particle dose was measured.

When compared by mass, PE nanoplastics produced an inflammatory response at least as strong as that of diesel exhaust particles. When the researchers compared doses based on particle surface area, both PE and PP nanoplastics showed greater inflammatory potential than diesel exhaust particles.
The team also examined alveolar macrophages, immune cells that act as the lungs' cleanup crew. Exposure to the nanoplastics increased the production of reactive oxygen species (ROS), highly reactive molecules that can damage cells when produced in excess.

ROS production was closely associated with the inflammatory response, helping explain how nanoplastics can promote the recruitment of additional immune cells and contribute to lung tissue injury. Gene expression analysis also revealed changes in pathways involved in inflammation and immune regulation.
The findings show that nanoplastics can actively disrupt immune responses in the lungs under the experimental conditions tested. They also suggest that assessing airborne particles by mass alone may underestimate the inflammatory potential of nanoplastics.

Polyethylene and polypropylene nanoplastics caused acute lung inflammation after intratracheal delivery in mice. Both were more inflammatory than diesel particles at equal surface-area doses. Inflammation was associated with increased reactive oxygen species in alveolar macrophages. Mass-based dosing alone may underestimate nanoplastic inflammatory potential.

Eunsol Bae et al., Comparative toxic potential of polypropylene and polyethylene nanoplastics using a mouse intratracheal instillation model, Journal of Hazardous Materials Advances (2026). DOI: 10.1016/j.hazadv.2026.101625

Comment by Dr. Krishna Kumari Challa 7 hours ago

Very strong El Niño episodes are associated with over 100,000 additional heat-related deaths worldwide per year
Very strong El Niño episodes were associated with an estimated 107,035 additional heat-related deaths and 112,681 fewer cold-related deaths annually worldwide versus neutral conditions. These changes largely offset globally, but combined heat- and cold-related mortality increased in lower-resource countries.

Natalia Shartova et al., Global temperature-related mortality associated with El-Nino Southern Oscillation, Nature Medicine (2026). DOI: 10.1038/s41591-026-04793-w

Comment by Dr. Krishna Kumari Challa 7 hours ago

Maps of inflammaging reveal the heart does not age evenly

Scientists have long known that aging drives inflammation in the heart, but exactly how those changes are distributed throughout the organ has remained unclear. Now, a research team has pinpointed hotspots where these "inflammaging" signals concentrate, providing a new map of cardiac aging and a foundation for future studies of cardiovascular health and decline.
In a study of mouse hearts published in Aging Cell, JAX researchers found that cellular signatures associated with age-related inflammation and scarring concentrated in the aortic valves and aortic root, where immune and connective tissue cells interact in ways that change with age and may influence the health of the surrounding heart muscle.
Rather than finding signs of aging evenly distributed, the researchers discovered hotspots of inflammation and fibrosis (or scarring) concentrated in the valves and aortic root. They concluded that these regions may serve as hubs of cardiac aging, where inflammation and aging signals concentrate, potentially influencing surrounding muscle tissue.
Together, the findings reinforce evidence that the valves and aortic root may function as localized hubs of cardiac aging.

Aleksandra Aljakna Khan et al., Alterations in the Immune‐Fibrotic Axis Are Spatially Localized in the Aging Heart, Aging Cell (2026). DOI: 10.1111/acel.70768

Comment by Dr. Krishna Kumari Challa 8 hours ago

The brain's 'dimmer switch' could help explain why attention drifts

Researchers have discovered that serotonin, a brain chemical best known for its role in mood and mental health, also helps regulate attention. These findings suggest serotonin-producing neurons deep in the midbrain act like a dimmer switch on attention.
More than a century of research has revealed how attention shapes behaviour.
Everyone has moments of sharp focus and moments of drift. This work identifies a specific brain chemical that selectively controls the moment-to-moment strength of attention to salient stimuli.
In the study, when researchers reduced serotonin activity, the mice in the experiment focused better. Increasing serotonin had the opposite effect. That was surprising because it's often assumed that increasing a brain signal will improve performance.
The results suggest the level of serotonin helps control the moment-to-moment strength of attention. Rather than turning attention on or off, serotonin appears to act more like a dimmer switch, dialing its strength up or down.

These insights could help researchers better understand such conditions as ADHD. They also raise new questions about how medications that act on serotonin—including common antidepressants—may affect the brain.

While people often think of distraction as a problem, occasional lapses in focus may serve an important purpose.

From an evolutionary perspective, the ability to quickly shift attention to a new threat or opportunity was probably beneficial for survival.
Today, that same system may be at work when you're focused on your job but still monitoring your phone for an important message. The challenge is finding the right balance between focusing strongly and remaining responsive to changes around us.

Jonas Lehnert et al., Rapid dynamics of dorsal raphe serotonin neurons regulate the strength of visual attention, Nature Communications (2026). DOI: 10.1038/s41467-026-70658-y

Comment by Dr. Krishna Kumari Challa 9 hours ago

Their analysis revealed that cancer cells naturally undergo −1 ribosomal frameshifting, in which ribosomes slip backward by one genetic letter at specific codon pairs, such as AGAACG and ACGAGA. This often produces detectable peptides or proteins, such as gasdermin D (GSDMD-N), from the altered genetic instructions.

The researchers traced this slippage to elevated phosphorylation of ribosomal protein S6 (pRPS6), which pushes paused ribosomes into an alternative reading frame. This phosphorylation is driven by the mTOR and MAPK growth signalling pathways, which are often overactive in cancer cells.
The researchers designed FAST to exploit the frameshifting tendency of cancer cells. They placed a fragment of GSDMD-N responsible for forming pores in the −1 reading frame, just behind the codon sequence that triggers ribosomes to slip backward.

When cancer cells underwent the shift, they produced a protein fragment that punched holes in their membranes, causing the cells to burst and die through an inflammatory process called pyroptosis. Normal cells, which read the sequence in the usual way, remain unharmed.

When delivered intravenously into a mouse model, FAST triggered substantial tumor regression in colorectal cancer (MC38) and spontaneous pancreatic cancer (KPC mice). It also curbed the spread of cancer to the liver and lungs. FAST also boosted immune activity within tumors and proved more effective when combined with immune checkpoint inhibitors. Tests in mice found no inflammation or organ toxicity in healthy tissues of major organs.

These findings offer hope that frameshifting-triggered gene circuits could, with further research, provide a way to selectively target cancer cells.

Qiuyi Wang et al., Cancer-selective gene circuits via intrinsic ribosomal frameshifting, Nature (2026). DOI: 10.1038/s41586-026-11200-4

Part 2

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Comment by Dr. Krishna Kumari Challa 9 hours ago

Scientists turn protein-making errors in cancer cells into a targeted kill switch

Like every other cell in the human body, cancer cells also produce their own share of proteins for survival. During this production process, cells often encounter a glitch called ribosomal frameshifting. This exceptionally rare event occurs roughly once in every 100,000 translation events, when the ribosome, while reading genetic instructions to make a protein, shifts its reading position. A recent Nature study investigated whether this protein-building glitch in cancer cells can be turned into a targeted cancer therapy.
Ribosomes read mRNA in groups of three genetic letters, known as codons. To find out where this reading process goes wrong, the researchers developed high-throughput dual-luciferase reporter libraries containing randomized genetic sequences. This allowed them to systematically track instances where ribosomes slipped out of their usual reading frame.

The ribosome profiler pinpointed specific codon pairs, such as AGAACG, that frequently trigger ribosomes to slip backward by one letter (a −1 frameshift) in cancer cells. Noncancerous cells, however, read these sequences normally.

The researchers turned this property of cancer cells into an advantage by building a synthetic therapy circuit called FAST (frameshifting-activated synthetic therapeutic circuit), which uses the ribosome's backward slip as a trigger to activate a protein that can punch holes in the cell membrane, setting off an inflammatory form of cell death known as pyroptosis.
Scientists have studied this process extensively in viruses, where it helps them produce a wider range of proteins from their genetic material. In mammals, however, frameshifting is considered extremely rare under normal conditions.

Previous research has shown that stress conditions such as nutrient shortages can trigger frameshifting in human cancer cells. Not much was known about whether similar shifting can occur in cancer cells under normal growth conditions.

The researchers wanted to find out whether this tendency could be exploited to solve a persistent problem in cancer treatment: how to make toxic therapies switch on in tumor cells while leaving healthy tissues unharmed.

They set up a large-scale screening model to identify and verify frameshifting-prone sequences in a variety of human and mouse cancer cell lines, such as melanoma, liver, colorectal and ovarian cancer. The researchers developed a specialized computational pipeline to track ribosomes as they read mRNA transcripts and pinpoint pairs of codons where they struggled to maintain the normal reading frame. They also built in guardrails to ensure that the signals they detected came from actual ribosomal frameshifting, rather than other ribosome-related processes.
Part 1

Comment by Dr. Krishna Kumari Challa on Saturday

Scientists achieve record-breaking low temperature on China's space station, paving the way for new physics experiments
A rubidium Bose–Einstein condensate produced in an optical trap aboard Tiangong reached an equivalent temperature of 9.7 picokelvin, about four times below the previous record. Its expansion was tracked for 7 seconds, extending observation times for quantum experiments in microgravity.

Wei Xiong et al., Quantum gases below 10 picokelvin in space, Science (2026). DOI: 10.1126/science.aea5324

Comment by Dr. Krishna Kumari Challa on Saturday

Noise pollution changes biology or behaviour in 80% of animal species studied

We live in a noisy world. Whether it is the roar of traffic, the rumble of ships or the hum of heavy industry, there is often no escaping noise unless you are a hermit on a desert island.
Noise pollution is already known as a health risk to humans and has been linked to heart attacks, type 2 diabetes and other conditions. But it is also bad news for the animal kingdom, as a new study published in the journal Science reports.

Earlier studies have demonstrated how noise can affect individual animals, causing problems such as stress and changes in communication. What has been missing, though, is a clear understanding of how it affects entire animal populations and food webs.

To try and understand the bigger picture, researchers gathered data from 214 experimental studies covering 177 species. This included information on how noise affects body functions, development, behaviour, survival and reproduction, abundance, and predator-prey interactions.

They analyzed studies comparing animals exposed to human-made noise with control groups, while accounting for evolutionary relationships among species. This was important because closely related animals often react similarly just because they share a family tree. They needed to make sure those shared traits didn't skew the results.
They found that in 80% of the species studied, noise affected at least one aspect of body function, development or behavior. For example, the paper notes that noise can trigger increased cellular stress and elevated stress hormones in animals and alter physical development. But there were some positive findings too.

"These responses can create winners and losers among species, reshaping ecosystem dynamics," wrote the researchers in their study. They explained that these shifts can alter the balance of nature, which could change how different creatures survive and interact in a louder world.

For example, a loser would be a struggling predator missing out on a meal because noise interferes with its hunting success. But a winner could be another predator benefiting when noise drives prey animals out of their shelters and into the open, making them easier to catch.

Despite some advantages, the overall effect of noise pollution on the animal kingdom appears to be a negative one. To tackle this, the researchers point to a possible solution. "Targeted acoustic management such as low-noise zones creating acoustic refugia offers actionable pathways for mitigating these impacts."

Hansjoerg P. Kunc et al., Echoes of the Anthropocene: Noise pollution as a global threat, Science (2026). DOI: 10.1126/science.adu9593

Comment by Dr. Krishna Kumari Challa on Saturday

However, computer simulations strengthened the suggestion of cause and effect. Their models showed that when suspended microplastics were present in the water, they scattered light in ways that produced a brightening pattern consistent with what satellites observed. This occurred in just 3% of simulations involving only natural changes, compared with 13% when microplastics were also included.

The researchers note that while natural changes in plankton populations or dissolved organic matter could theoretically cause a similar colour shift, doing so would require unusually drastic ecological changes.

If the microplastics are contributing to the colour change, the researchers think satellite ocean-colour measurements could be a valuable diagnostic tool to assess and monitor their accumulation from space. "Clear evidence of the scale of microscopic pollution is essential to address the growing use and mismanagement of plastics."

Shea Cheatham et al., The ocean's color is changing near the Great Pacific Garbage Patch, Communications Earth & Environment (2026). DOI: 10.1038/s43247-026-04071-0

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