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Comment by Dr. Krishna Kumari Challa 9 hours ago

Celiac risk may begin with weaker helper T cells, not just overactive immunity

New research is challenging long-held assumptions about autoimmune disease, revealing that celiac disease may be driven not just by an overactive immune system, but by subtle defects in how immune cells function.
Published in Immunology & Cell Biology, the study found consistent shifts in immune cell behavior in people with celiac disease—differences that may appear long before symptoms develop.

Researchers identified distinct patterns in early immune responses that could help predict autoimmune risk and support more personalized monitoring and care in future.
The research examined a type of immune cell known as CD4 helper T cells, which coordinate immune responses, fight infection and support antibody production.
Contrary to expectations, immune cells from people with celiac disease were not simply overactive. Instead, they showed weaker responses.

The study found CD4 helper T cells from people with celiac disease:

produced less interleukin-2, a key immune signalling molecule
entered cell division more slowly
were less likely to survive

These differences were subtle but remarkably consistent.
Notably, the same pattern appeared regardless of sex or whether individuals were newly diagnosed or managing the condition with a gluten-free diet.

This tells us the effect isn't simply driven by inflammation or diet. It suggests an underlying difference that may be linked to genetic risk.
Although the study focused on celiac disease, the findings may have broader relevance.

Autoimmune diseases affect around 5% of the population, and many share overlapping genetic risk factors.

If autoimmune risk is partly built into how immune cells behave from the start, this could change how we think about early detection.

Anthony J Farchione et al, Functional immune profiling reveals CD4⁺ T cell dysregulation in coeliac disease, Immunology & Cell Biology (2026). DOI: 10.1111/imcb.70132

Comment by Dr. Krishna Kumari Challa 9 hours ago

Eating in the middle of the night can cause gastrointestinal issues

Eating during the body's usual sleep period disrupts synchronization among intestinal cell circadian clocks, with interstitial cells of Cajal (ICCs) showing resistance to phase shifts. This desynchronization may impair intestinal motility and contribute to gastrointestinal disorders linked to circadian rhythm disturbances, such as those experienced by shift workers or during jet lag.

Eating when the body is normally asleep appears to desynchronize the circadian clocks of different cell types in the intestines, a new study suggests. The findings, published in PNAS, could help explain why shift work, jet lag and other environmental stressors that affect circadian rhythms are associated with irritable bowel syndrome, inflammatory bowel disease, constipation and other gastrointestinal disorders.
Research in the 1990s and 2000s showed that a region of the brain known as the suprachiasmatic nucleus (SCN) acts as a master timekeeper for the body, setting various cellular processes to occur rhythmically over a 24-hour period based on cycles of light and darkness.

However, in 2000, Yamazaki and his colleagues showed that cells throughout the body have their own autonomous circadian clocks that are influenced both by signals from the SCN and environmental cues.

In line with this idea, research has shown that the intestines have their own rhythms that can be influenced by a variety of factors, such as the timing of meals.

These findings were made using whole intestinal tissue but the intestines contain a variety of cell types, including muscle, nerve and immune cells. It has been unclear whether each of these populations has its own circadian clock and whether they run on the same schedule.
To find out, researchers monitored novel mice on set 12-hour cycles of light and dark.
Five intestinal cell types—enteric neurons, enteric glial cells, interstitial cells of Cajal (ICCs), smooth muscle cells and muscularis macrophages—glowed green when a key circadian clock gene called Per2 was active. Although food was available at all times, the mice ate about 80% of their meals at night because of their nocturnal nature.

After about a week in this environment, the researchers observed intestinal cells glowing green at approximately the same times, suggesting the different cell populations had their own autonomous circadian clocks that cycled in sync.

However, when the researchers made food available only for four hours during the daytime—forcing the mice to eat at abnormal times—Per2 activity shifted to match this new rhythm in every cell population except for the ICCs. These cells resisted changes to their circadian clock, staying out of sync with the other cell types for weeks.
Such asynchrony may also occur in people who eat outside the body's usual circadian rhythms, such as night shift workers or those who fly to different time zones. Because ICCs play a key role in intestinal motility, their resistance to adapting to a changed circadian clock could affect digestive and metabolic function.

Finding a way to synchronize the different intestinal cell populations through diet, probiotics or drugs could eventually help ease the gastrointestinal problems associated with altered circadian timing, the researchers say.

Isabel Magaña et al, Not all gut cellular circadian oscillators are food entrainable, Proceedings of the National Academy of Sciences (2026). DOI: 10.1073/pnas.2601012123

Comment by Dr. Krishna Kumari Challa 10 hours ago

Fathers may influence their children's health before they're even conceived
Paternal metabolic information influencing offspring health is established during sperm development in the testis, not acquired later during sperm maturation in the epididymis. Mature sperm lack mitochondrial DNA-driven transcription, indicating that preconception paternal health can shape offspring metabolic traits via mechanisms set during spermatogenesis.

Testicular origin of epigenetic inheritance independent of sperm mitochondrial DNA and epididymal exposure, Proceedings of the National Academy of Sciences (2026). DOI: 10.1073/pnas.2611096123. doi.org/10.1073/pnas.2611096123

Comment by Dr. Krishna Kumari Challa 10 hours ago

The birds got scared of the genet in cooler temperatures—they'd call out, scan their surroundings, or simply flee. But once it got hot, they behaved similarly whether they were facing the carnivore or the box. Ridley suggests that this could translate into higher chances of fatal predator attacks as heat rises, which could harm populations of babblers and other prey species.

These studies are not just abstractions. In the Kalahari, where southern pied babblers use their wits to search for worms, temperatures are rising twice as fast as the global average. In tropical rivers, where male guppies seek mates, heat waves are growing longer and more intense. It's the same story across much of the planet—temperatures climb, and animal thinking becomes strained, potentially putting species at risk. The effects may be magnified in certain areas such as cities, which often exhibit even warmer temperatures than nonurban areas.

If anything, Ridley says, "We are probably underestimating the impacts of increased heat on animal minds."

Heat hampers brain cells
In addition to highlighting behavioral changes, animal studies can also offer insight into how heat meddles with brain cells. Experiments with mice, for example, show that poor performance in hot mazes is linked to inflammation in the hippocampus, the brain's memory center, and can lead to the death of neurons there. If fruit flies are exposed to heat in early life, their adult brains have fewer mushroom bodies—structures that are important for insect learning. And a 2025 study on cleaner wrasses, a fish species that cleans parasites off other fish, showed that after a heat wave, a key part of the fish brain that controls cognitive functions such as memory shrank considerably.
Part 3

Comment by Dr. Krishna Kumari Challa 10 hours ago

Cognitive problems
Heat waves can also hamper the ability of animals to learn, as Ridley and her colleagues observed with the southern pied babblers. In one of their experiments, the birds were presented with a simple wooden block with two holes drilled in it, each covered with a lid. If the bird pecked at the lid, it would rotate, revealing either an empty hole or a tasty mealworm. The babblers, Ridley says, "are highly motivated by mealworms."

One lid was dark, and the other a lighter shade of the same color. During heat waves, the birds needed twice as many trials to learn that the mealworm was always hidden under the lid of the same shade.

Another group of scientists tested zebra finches, pretty Australian songbirds, and discovered that if temperatures are high, they too have cognitive problems. When figuring out how to get a mealworm out of a see-through tube with an opening at one end, they would just keep pecking on the tube, says study co-author Elizabeth Derryberry, an evolutionary biologist at the University of Tennessee, Knoxville.

It's the bird equivalent of "banging your head against a brick wall.
Adding to the tally, several years ago researchers showed that when the heat is on, mice have trouble finding their way around a maze and forget objects they've seen the day before. More recently, researchers found that male guppies, popular aquarium fish, also have trouble getting through a maze after spending several days in heat-wave-like 90-degree water, even if the prize for getting it right is a virgin female—which they tend to find particularly attractive.

For animals such as fish and insects that can't control their body temperature, heat waves could be particularly detrimental. "Changes in air temperature will affect brain temperature," says Baird. A hotter brain could hinder the functioning of nerves, and that, she says, "might affect sensing, memory and learning."

When Baird and colleagues tried to teach bumblebees to associate sweet sucrose with the color blue and bitter quinine with yellow, most of the bumblebees learned the trick at 77 degrees, but fewer than half managed to do so at 90 degrees. Such impaired cognition could spell trouble in the field. If the insects forget which flowers they should pollinate—in the case of bumblebees, these include tomatoes and blueberries—or how to get back home with nectar, not only will the pollinators suffer, but human agriculture too, Baird says.

Heat appears to dangerously diminish animal vigilance as well. In Ridley's recent experiments, once the mercury in the Kalahari Desert reached 96 degrees Fahrenheit, pied babblers lost their ability to properly respond to predators. In their studies, researchers lured birds toward a mystery shape covered in a sandy-colored blanket, using worms as bait. Once a babbler approached, the scientists would reveal what was hidden underneath: either a taxidermied catlike carnivore called a genet, or a similarly sized and colored wooden box.
Part 2

Comment by Dr. Krishna Kumari Challa 10 hours ago

They call it 'stupid hot' for a reason: Heat muddles animal brains

There is plenty of evidence that animals are affected by heat. Birds, for example, spend less time looking for food and feeding their young; they even sing less. Instead, they'll sit around for hours with wings spread to dissipate the heat, and pant with their beaks wide open. Some animals retreat to shade or hide in cool burrows—again, skipping meals. Bees, meanwhile, splash their faces with droplets of water midflight when the weather is sizzling. This way, "they get convective cooling for their brain.

Some of the first hints that hot temperatures can mess up minds, however, came from studies on humans. Back in the 1800s, Belgian astronomer Adolphe Quetelet noticed that violent crime in France peaked in the summer. Later studies linked high temperatures with gun violence, mental health-related hospital admissions, suicide and gambling. When it's hot, people have trouble making decisions, and their memory suffers. For students at schools without air conditioning, a school year just 1 degree Fahrenheit hotter reduces test scores by 1%, a study found.

Increasingly, there's evidence that other species may also be more aggressive when the mercury shoots up. A 2023 study that combed through nearly 70,000 reports of dogs biting people across eight U.S. cities, from Chicago to Baltimore, found that such incidents were more likely to happen on hot, sunny and smoggy days. The risk was 10% higher on a 90-degree day than on a 60-degree day—and not only because people are more apt to venture out for walks when the sun is shining. The researchers controlled for seasonal effects in their data.
It's likely that both humans and dogs get stressed and more irate at higher temperatures.

Elevated temperatures impair cognitive function and increase aggression in various animal species, affecting learning, memory, decision-making, and social interactions. Heat waves reduce animals' ability to find food, avoid predators, and perform essential behaviours, potentially threatening survival and ecosystem stability. Neurological effects include inflammation, neuron loss, and structural brain changes.

And it's not only dogs: A 2025 study out of China showed that many animals, including snakes and cats, are more inclined to bite people when it gets hot.

Animals also seem to lose their cool with each other, especially if food is involved. Scientists used binoculars and spotting scopes to spy on wild goat-like chamois that feed on protein-rich plants on the slopes of the Italian Apennine Mountains. More than 1,600 hours of observations over two summers revealed that when temperatures rose from 54 degrees Fahrenheit to 64 degrees Fahrenheit, vegetation grew scarcer, and chamois aggression in turn shot up.

The animals became territorial over patches of food. They assumed threatening postures and chased each other—attacks that, at times, escalated. The study authors predict that chamois aggression will go up 50% by 2080 because of climate change.

The small tropical fish called a golden julie also gets confrontational in the heat. Ordinarily, when a golden julie is placed in front of a mirror, it sees its reflected image as a stranger and shows some hostility, raising its fin, for example. But if the normally 78-degree water is raised to a hot 84 degrees, the fish is more likely to get aggressive, and may bite and slap its tail against the mirror as it tries to scare or attack the reflected image.
Part 1

Comment by Dr. Krishna Kumari Challa 10 hours ago

To better understand why this happens, the researchers used cryo-electron microscopy, a powerful imaging technique that can visualize proteins at near-atomic resolution.

The team found that TRPM4 contains a flexible drug-binding region that changes shape depending on temperature and calcium levels. Those shape shifts determine which compounds can bind to the protein and what happens when they do.

These structures show exactly how the environment reshapes the binding pocket. Even small changes in temperature or calcium can shift how a drug interacts with the protein.
This work points toward a new concept that Lü and Du call "environment-aware pharmacology." Instead of designing drugs that behave the same way everywhere in the body, scientists could develop therapies that activate only under disease conditions. For example, a drug could activate only inside stressed or damaged cells where calcium reaches abnormally high levels. That could make treatments more precise while reducing adverse side effects.

According to Lü and Du, their study's implications should extend far beyond TRPM4. If temperature and cellular chemistry can dramatically alter one drug target, similar hidden effects may exist across many others.

This work highlights a missing dimension in how we study biology and develop therapeutics.
By bringing physiological conditions back into the picture, we can better understand how proteins function—and how to target them effectively.

Hu, J., et al. Temperature and intrinsic Ca²⁺ reshape TRPM4 pharmacology, Nature Structural & Molecular Biology (2026). www.nature.com/articles/s41594-026-01818-3

Part 2

Comment by Dr. Krishna Kumari Challa 10 hours ago

Some drugs 'fail' because of unrealistic testing conditions, scientists discover

A drug once dismissed as ineffective suddenly worked—when scientists tested it under more realistic conditions that mimic the human body. In this surprising new discovery, scientists uncovered a hidden rule of drug behaviour. A medicine's effectiveness can change dramatically depending on the conditions inside our cells.

Drug efficacy can change significantly depending on physiological conditions such as body temperature and intracellular calcium levels, which affect protein structure and drug binding. Testing drugs under more realistic cellular environments revealed previously undetected activities and even opposite effects for some compounds. These findings suggest that drug screening should incorporate physiological variables to improve therapeutic design and predictability.
In the new study, scientists found that two fundamental features of human biology—body temperature and calcium levels inside cells—can change how drugs interact with their targets, sometimes even flipping a drug's effect entirely.

The findings could help explain why some drug candidates look promising in early lab tests but fail later in development. They also could point toward a smarter way to design more effective medicines with fewer unwanted side effects.
Drugs don't act in isolation. They act within the physiological environment of the cell. By incorporating temperature and calcium into their experiments, researchers uncovered drug activities that were completely invisible before.
In early evaluations, researchers commonly test drugs in simplified laboratory conditions—often at room temperature and in artificial chemical environments that do not necessarily reflect the realities inside the human body.
But proteins are dynamic, shape-shifting molecules. Their structure can change in response to their surroundings, including temperature and chemical signals like calcium. Because drugs often work by binding to proteins, even small structural shifts can dramatically change a drug's ability to work. In other words, if the protein changes its shape, the drug's effectiveness can change too.
To better understand this connection, the Northwestern team focused on TRPM4, a protein channel involved in heart rhythm, immune responses and other essential biological functions. They test triphenylphosphine oxide (TPPO), a small synthetic molecule, on cells expressing the TRPM4 channel.

In lab tests under simplified conditions, TPPO appeared inactive, showing no effect on TRPM4. But when the Northwestern team tested it at body temperature (37°C / 98.6°F) and with realistic calcium levels, the supposedly inactive compound powerfully activated the TRPM4 channel.

This completely overturned what they thought they knew. It shows that they may be overlooking important drug candidates simply because they are not testing them under the right conditions.
In another set of experiments, the team uncovered yet another surprise. This time, the researchers tested a compound called Necrocide-1 (NC1), which is known to activate TRPM4. At low calcium levels, NC1 behaved as expected, switching the protein channel on. But when calcium levels increased—as they often do when cells are stressed, injured or diseased—the same molecule largely lost its effect.

Simply put: The cell's internal environment determined whether the drug worked.
This tells us drug behaviour is not fixed. The same molecule can behave very differently depending on the biological context.
part 1

Comment by Dr. Krishna Kumari Challa 11 hours ago

'Technostress': Why many older people feel shut out by the digital world
Older adults experience technostress due to rapid digitalization, facing barriers such as inaccessible interfaces, inadequate support, and increased scam risks. While technology can enhance independence and social connection, it also causes distress and exclusion, particularly when digital tools are not age- or culturally-responsive. Digital inclusion requires more than willingness; equitable access, skills, and support are essential to prevent widening disparities.

original article.

Comment by Dr. Krishna Kumari Challa 11 hours ago

Asexual reproduction slowed the pace of evolution to a crawl

The way that Earth's first animals reproduced held back life's diversity for millions of years, until stress and competition led to the development of sexual reproduction, which in turn accelerated the pace of evolution.
Researchers from the University of Cambridge studied fossils from the oldest-known animals on Earth, dating from 574 million years ago, and found that asexual reproduction slowed the pace of evolution to a crawl, since it limited competition between different groups.

Their results, reported in the journal Nature Ecology & Evolution, could help explain a longstanding puzzle in paleontology: why animal life appeared on Earth but then barely changed for millions of years, before a second wave of diversification gave evolutionary progress a major boost.

After billions of years of microbial life, during the Ediacaran period, between 635 and 539 million years ago, life exploded in size and the first animals appeared. Some of these earliest animals, such as Fractofusus, could grow as tall as two meters, although most were much smaller.

The influence of reproductive mode on resource competition and diversity patterns in Ediacaran early animal communities, Nature Ecology & Evolution (2026). DOI: 10.1038/s41559-026-03094-2

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