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Comment by Dr. Krishna Kumari Challa on June 12, 2026 at 3:51pm

Gut microbes unlock hormone signalling that regulates gut movement

Millions of people worldwide are periodically or chronically affected by gut-related conditions, such as irritable bowel syndrome (IBS), gastroesophageal reflux disease (GERD) and gastroenteritis. Uncovering the physiological and biological processes that contribute to gut health could thus be highly valuable, as it might help devise more effective interventions to prevent and treat these ailments.

The transit of food, fluids and waste through the intestine is known to be coordinated by various interacting systems in the body, including gut wall muscles, neurons in the gastrointestinal tract and hormones. A growing body of research has also been exploring the crucial contribution of bacteria and other microorganisms residing in the digestive tract, which are collectively referred to as the gut microbiome.

Researchers  recently carried out a study aimed at better understanding how these gut microbes interact with specific sex hormones and nerve cells that control the movement of muscles in the intestines.

Their paper, published in Nature Neuroscience, identifies a previously unknown mechanism through which gut microbes influence the peripheral nervous system, regulating the healthy functioning of the digestive tract.

"The colon is an organ in which a lot of different systems in the body converge, including hormones, bacteria, immune cells and nerves.

To explore the interactions between gut microbes, hormones and nerve cells, the researchers ran a series of experiments involving mice. They dramatically reduced the microorganisms in the mice's gut using antibiotics, which are known to destroy bacteria in the intestines. They then monitored the animals' intestinal transit and measured levels of specific hormones called androgens after gut microbes were depleted.

They  used immunohistochemistry to find the different types of neurons and non-neuronal cells that are responsive to hormones like testosterone, antibiotics to deplete bacteria and determine their contributions to both hormone levels and motility, and genetically engineered mice in which we could make different cell types unresponsive to testosterone so that they could learn which ones were most essential for this signaling pathway.

When they discovered that bacterial metabolism of inactive hormones was important for this pathway, they then used biological shifts that happen with puberty in the fecal metagenome to identify candidate bacterial enzymes that could mediate this metabolism. They found one that robustly metabolized inactive androgen-glucuronides into their active forms."

In a series of follow-up experiments, the researchers delivered the microbial enzyme they identified into the colon of mice with a depleted gut microbiome. Remarkably, they found that this enzyme restored androgen signaling among nerve cells that regulate gut movements, which hints at its therapeutic potential.

This study could improve understanding of the biological mechanisms through which gut microbes promote the healthy functioning of the gut.

Valentina N. Lagomarsino et al, Microbial reactivation of host androgens directs enteric neuronal regulation of gut motility, Nature Neuroscience (2026). DOI: 10.1038/s41593-026-02321-0.

Comment by Dr. Krishna Kumari Challa on June 11, 2026 at 1:49pm

When sounds become unbearable
For people with misophonia, a psychological condition characterized by a severe aversion to sound, everyday noises can trigger a fight-or-flight reaction. The condition can be life-altering, but isn’t currently recognized by the International Classification of Diseases (ICD) system, making it difficult to diagnose and treat. Some researchers are pushing for the ICD to incorporate misophonia, but others argue that we don’t understand the condition well enough yet. Misophonia “doesn’t fit neatly in either the psychiatric or audiological realm”, says clinical psychologist Steven Taylor, which makes it difficult to officially classify.

Comment by Dr. Krishna Kumari Challa on June 11, 2026 at 1:20pm

Bilingual brains keep concepts aligned across languages, individual neuron data suggest
Recordings from individual hippocampal neurons in bilingual individuals show that while different neurons respond to different languages, the overall neural organization of conceptual meaning remains consistent across languages. Related concepts occupy similar positions in neural space regardless of language, indicating a shared, language-independent semantic geometry. Translation-equivalent words activate some overlapping neurons, but bilingual meaning primarily emerges from coordinated activity across large neural populations rather than specialized "dictionary neurons." These findings suggest the brain maintains a common internal structure for meaning, enabling fluid language switching without confusion.

I wonder what happens if you are a multilingual.

Xinyuan Yan et al, Shared neural geometries for bilingual semantic representations in human hippocampal neurons, bioRxiv (2026). DOI: 10.1101/2025.11.16.688726

Comment by Dr. Krishna Kumari Challa on June 11, 2026 at 1:15pm

Researchers identify which eye infections pose greatest threat to vision

Eye surgery today is safer than ever, yet ophthalmologists must remain watchful for a rare but serious complication that can threaten sight within days: a bacterial eye infection called endophthalmitis. Now, clinician-scientists have identified which types of endophthalmitis pose the greatest danger—findings that could help deliver faster, more personalized treatment to improve a patient's chances of recovery.
The type of bacteria causing endophthalmitis significantly affects the risk of severe vision loss, with aggressive species such as certain Streptococcus and Enterococcus leading to worse outcomes than more common surface bacteria. Rapid identification of the causative organism may enable more targeted and timely interventions to improve visual prognosis.
Ophthalmologists treating endophthalmitis have largely based treatment decisions on a patient's visual acuity at the time of diagnosis. Published in the American Journal of Ophthalmology, the new findings point to another factor that may be just as important: understanding exactly which organism is causing the infection.

Some bacteria caused relatively mild disease, while others triggered rapid and devastating damage inside the eye.

Not all infections behave the same way. These new findings suggest we may need to identify the most dangerous infections faster so we can intervene earlier and better protect patients' vision.
The study found patients infected with more aggressive bacteria—including certain Streptococcus and Enterococcus species—were far more likely to experience severe vision loss and complications than patients infected with more common surface bacteria.

Marusha Ather et al, Pathogen-Associated Visual Outcomes Following Postprocedure Endophthalmitis, American Journal of Ophthalmology (2026). DOI: 10.1016/j.ajo.2025.11.038

Christopher D. Conrady et al, Time to Revisit the Endophthalmitis Vitrectomy Study: Areas for Improvement in the Diagnosis and Treatment of Endophthalmitis, Ophthalmology (2026). DOI: 10.1016/j.ophtha.2026.02.016

Comment by Dr. Krishna Kumari Challa on June 11, 2026 at 12:59pm

Statin use linked to lower risk of frailty in older veterans
Statin initiation in older veterans was associated with a 24% lower risk of developing frailty over an average 5.3-year follow-up, independent of comorbidities and demographic factors. The protective association was consistent across subgroups, including those with early signs of frailty, suggesting statins may help prevent frailty beyond their cardiovascular benefits.

Saadia Qazi et al, Statins and survival free of incident frailty among older US veterans, European Heart Journal (2026). DOI: 10.1093/eurheartj/ehag451

Comment by Dr. Krishna Kumari Challa on June 11, 2026 at 12:52pm

Decades-old puzzle solved as scientists uncover cause of inflammatory bowel disease
Researchers have identified an important driver of inflammatory bowel disease (IBD). This discovery reshapes understanding of IBD and opens the way to targeted approaches to diagnosis and treatment in a subset of patients. The findings suggest that inflammatory bowel disease is not a single condition, but a group of biologically distinct diseases driven by different underlying mechanisms.
In a study published today in the New England Journal of Medicine, researchers analyzed more than 4,900 patients with IBD and made two major discoveries: first, that a substantial subset of patients show autoimmune responses to one of the guardians of the immune system, interleukin-10 (IL-10), which leads to uncontrolled inflammation; and second, that this damaging immune response is the mechanism for one of the strongest known genetic risk factors for IBD.

Antibodies that block interleukin-10 (IL-10), a cell-to-cell messenger that normally acts as one of the body's key controls on inflammation, effectively remove the immune system's natural "brake" on inflammation, allowing inflammatory responses to continue unchecked.

IBD, which includes Crohn's disease and ulcerative colitis, affects millions worldwide. . It is a lifelong condition that commonly begins in adolescence or early adulthood and can require repeated hospital treatment, long-term immunosuppressive medication, and—in some cases—surgery. Despite advances in treatment, many patients cycle through multiple therapies without achieving lasting disease control—impacting their lives and costing the health care system millions.
The researchers found high levels of anti-IL10 neutralizing autoantibodies in the blood of about 3.5% of IBD patients, both Crohn's disease and ulcerative colitis, but not in healthy individuals.
The researchers also found that the presence of these antibodies was strongly linked to carriage of a particular genetic variant known as HLA-DRB1*01:03.

The link between HLA-DRB1*01:03 and a severe form of inflammatory bowel disease was first identified by Oxford researchers 30 years ago. The new findings show that people carrying this variant are far more likely to develop antibodies that block IL-10, helping explain how the gene contributes to disease.
Understanding what drives the inflammation provides a clear explanation for disease in this group of people and opens the door to new treatments that target the autoantibodies themselves or cells that produce those autoantibodies.

IL-10 Autoantibodies and HLA-DRB101:03 in Inflammatory Bowel Disease, New England Journal of Medicine (2026).

Comment by Dr. Krishna Kumari Challa on June 11, 2026 at 12:12pm

Why plastic lingers: Water chemistry slows nature's cleanup

Scientists have long known that sunlight helps break down plastic. So, why do plastic products linger for decades and even centuries in rivers, lakes, and oceans—even when bathed in direct sunlight? Researchers have uncovered an unexpected answer. The surprising culprit is the water itself.
Natural water chemistry, particularly the presence of salts and organic matter, significantly slows the photodegradation of polystyrene plastics by competing for sunlight and suppressing reactive processes. As a result, plastics degrade much faster in purified water than in freshwater or seawater, limiting microbial breakdown and contributing to their persistence in natural environments.
In a new study designed to mimic real environmental conditions, researchers found that the chemical makeup of natural waters—especially combinations of salt and organic matter—significantly delays the breakdown of polystyrene, a common plastic used in packaging and food containers.

Because sunlight cannot effectively initiate the degradation process, microbes cannot finish the job. That means nature's cleanup process slows down, allowing plastics to accumulate and persist in waterways around the world.

The findings show that solving plastic pollution isn't only about the material itself but also about the environment it enters. These insights could be used to design new types of plastic that degrade even in salty, complex environments or that don't rely on sunlight to jump-start the breakdown process.

Polystyrene photooxidation in natural waters as a precursor to microbial degradation, npj Materials Degradation (2026). DOI: 10.1038/s41529-026-00788-7

Comment by Dr. Krishna Kumari Challa on June 11, 2026 at 12:03pm

The Milky Way was rewired by a cataclysmic collision billions of years ago. Now it is on course for another
The Milky Way underwent a major collision with a dwarf galaxy 8–11 billion years ago, fundamentally altering its structure, stellar populations, and dark matter halo. Evidence of this event persists in the form of stars with distinct orbits and chemical signatures. Currently, the Milky Way is being gravitationally disturbed by the Large Magellanic Cloud, setting the stage for another significant galactic interaction.

original article.

Comment by Dr. Krishna Kumari Challa on June 11, 2026 at 12:00pm

Galaxy-killing wind discovered in the early universe
Observations of the early universe reveal that intense star formation and galaxy collisions can drive powerful winds that expel star-forming gas from galaxies, rapidly quenching their growth. The galaxy CRISTAL-02 exhibits such a wind, ejecting material at twice the rate of star formation, potentially leading to its death within 50 million years. This mechanism may explain the unexpectedly high number of massive, dead galaxies observed in the early universe.

Rebecca L Davies et al, Multiphase images of a powerful supernova-driven wind in the early Universe, Monthly Notices of the Royal Astronomical Society (2026). DOI: 10.1093/mnras/stag874

Comment by Dr. Krishna Kumari Challa on June 11, 2026 at 10:32am

People have an inherent preference for counter-clockwise motion, study reveals

Researchers in Spain and Japan tested a broad range of pedestrians in varying group sizes to see whether there were any patterns in their turning behaviours, and what factors influenced them, if any. It turns out that the vast majority of people prefer counter-clockwise turning. Most factors, such as culture or gender, made little difference. Only age showed a noticeable but small change, in that younger people followed this pattern more strongly.
When analyzing the experiments, researchers realized by chance that in 32 out of 33 experimental trials, as people moved and turned, they noticeably preferred to turn counterclockwise.
This was completely unexpected as, at least instinctively, when people walk around randomly, you imagine people turn as their needs suit them, with little sign of an overall preference. But there was a definite, measurable tendency for people to turn counterclockwise over clockwise, all things being equal.
The team had to understand the reason for this, and all good research practice dictates that you test observations against multiple possible causes to narrow down what's really going on.
Feliciani and his team set up experiments to observe pedestrian test subjects in different open and constrained environments. Not only did they test cultural background by having parallel tests in Spain and Japan, they also investigated group size, gender, handedness and age.

Of all these things, the only thing that stood out was that kids tend to have a stronger bias for the counterclockwise direction, so probably age plays a role in making the effect weaker or stronger.
These results may appear to be a minor, insignificant discovery, but in nature, most phenomena related to locomotion show that animals mostly walk without directional preference. The strong bias found in people hints at some asymmetry at the biomechanical level.
There are some interesting parallels to certain sports. Some running and driving competitions are always, but inexplicably, held on courses that run counterclockwise.

Individual locomotor bias drives counterclockwise motion in pedestrian crowds, Nature Communications (2026). DOI: 10.1038/s41467-026-73713-w

==

Q: Does this research include the Hindus who are used to walk around the Garbha Gruha of temples in clockwise direction always madam? Hindus generally believe clockwise turning auspicious .

Krishna :
 
No, this work was done in Spain and Japan.

I think walking around Garbha Gruha in Temples is deliberate. Because our customs and traditions ask us to do that. We obey them.

But this research work deals with ‘inherent preference’. When nobody asks you to follow it, when your mind is not conditioned to follow certain things, you automatically do things in the way your biology is programmed to do.

Maybe that ‘s why the word “ auspicious “ will be added in traditions and customs to influence peoples’ psychology and change their innate behaviours!

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