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Comment by Dr. Krishna Kumari Challa 3 hours ago

High folic acid in pregnancy linked to early bleeding risk
Among 2,400 first-time mothers, folic acid supplementation ≥800 µg/day was associated with increased spotting or mild vaginal bleeding before 16 weeks, particularly in male-bearing pregnancies. Early bleeding was associated with shorter gestation, spontaneous preterm birth, and placental abruption. Folic acid remains essential for neural tube defect prevention.

Hongyan Wang et al, High folic acid supplementation is associated with vaginal bleeding in early pregnancy in a fetal sex-specific manner: findings from two prospective cohort studies, Reproductive Health (2026). DOI: 10.1186/s12978-026-02344-7

Comment by Dr. Krishna Kumari Challa 3 hours ago

Women with type 2 diabetes are more likely than men to develop mental health conditions, study finds
After type 2 diabetes diagnosis, women had higher rates of mental health conditions than men (8.1% vs 5.3%), whereas men had more cardiovascular disease (8.4% vs 5.3%), end-stage renal disease, and hypertension. Mental health comorbidity was associated with premature mortality in both sexes; hypertension was the most frequent subsequent event.

Eto F, et al. Sex differences in trajectories to cardio-renal and mental health outcomes following the onset of type 2 diabetes: An observational cohort study using multi-state analysis in the UK Clinical Practice Research Datalink.PLOS Medicine (2026). DOI: 10.1371/journal.pmed.1005196

Comment by Dr. Krishna Kumari Challa 3 hours ago

Additional transfusion risk emerges for patients with tick-borne alpha-gal syndrome, beyond meat allergy

A new multi-institutional study suggests that alpha-gal syndrome, a tick-borne disease that can result in a chronic allergy to meat and animal byproducts, also may complicate certain patients' ability to safely receive a blood plasma or platelet transfusion.

Alpha-gal syndrome (AGS) is a serious allergy transmitted by a sugar molecule called alpha-gal in the saliva of lone star ticks. First documented in 2025, the allergy is triggered by ingesting meat from mammals, such as beef, pork and lamb, as well as other products from these animals, like dairy and gelatin. An AGS reaction can trigger delayed, severe reactions like hives, stomach pain and anaphylaxis.
At the same time, Dartmouth Health's Dartmouth Hitchcock Medical Center (DHMC) has seen an uptick in recent years in patients with type O blood experiencing severe and even life-threatening allergic reactions after receiving platelets or plasma from type B or AB donors.
Alpha-gal syndrome may increase allergic transfusion reactions in blood group O recipients of B or AB plasma or platelets, particularly in regions with high prevalence. Analysis of >550,000 transfusions supports avoiding B or AB platelet and plasma units for O recipients at risk.
Pathologists hypothesized that these patients may have pre-existing antibodies to alpha-gal from tick bites and that hospitals in regions with higher concentrations of AGS patients, like DHMC, might also see an increase in allergic reactions among O patients receiving B or AB units.
The international team of researchers now reports that transfusion-related alpha-gal syndrome, or TRAGS, is a legitimate manifestation of AGS and should be taken into account in the safety practices of hospital transfusion services.

Richard M. Kaufman et al, Epidemiologic Study of Transfusion-Related Alpha-Gal Syndrome, JAMA Internal Medicine (2026). DOI: 10.1001/jamainternmed.2026.3983

Comment by Dr. Krishna Kumari Challa 4 hours ago

Chemistry behind glow-in-the-dark art

Some of the world's brightest colours don't just reflect light; they create it. Scientists and museum conservators are now uncovering why these luminous pigments fade and how to preserve them for future generations. The findings could help protect artwork while informing the development of longer-lasting phosphorescent materials for a variety of applications, from fashion runways to airport runways.
Most paints and dyes are seen because they bounce visible light back to our eyes. Fluorescent and glow-in-the-dark pigments are different: They absorb light and give it back as a vivid glow. This produces the attention-grabbing visual effects found in pop art, fashion, traffic signage and the glowing stars that many people stick to their bedroom ceilings as children.
Over time, however, these bright materials break down. As the colours become duller, the artwork loses some of the oomph initially intended. For artists, the effect isn't simply cosmetic, because they intentionally use these colours for their visual impact.
Because fluorescent and phosphorescent materials attract attention and improve visibility, they're also important parts of safety signs and markings. By understanding how these materials break down over time, researchers want to help manufacturers develop products that stay brighter longer, such as luminescent paint for airplane runways.
They first identified what the materials are made of. Then, the researchers examined the pigments' photophysics—how they absorb, store and emit light—and how the processes change as the materials age.

The team found that many phosphorescent materials contain inorganic compounds and mineral-based pigments and differ significantly from the organic dyes commonly used in fluorescent colourants.
One of the most surprising initial findings is that prolonged exposure to high levels of humidity can play an equally important—and sometimes greater—role than prolonged exposure to ambient light in breaking down phosphorescent pigments. This information will inform improved storage and exhibition conditions for artworks containing this pigment.
Earlier studies of fluorescent pigments revealed that the compounds responsible for enhancing brightness, called optical brighteners, degrade faster than the pigmentary dyes themselves. As a result, colours appear to darken even when the pigment molecules remain intact.
These results also highlight why conserving modern artworks can be challenging. Conservators restoring fluorescent artworks must match colours under both visible and UV light, while the pigments themselves continue to change over time, making long-term restoration difficult.

Glow in the light & dark: Investigations of the photochemistry of emissive pigments used in art, acs.digitellinc.com/live/37/session/595033

Comment by Dr. Krishna Kumari Challa 4 hours ago

Heart capillaries may build natural bypasses for blood flow after heart attacks

Heart disease caused by blocked arteries is a leading cause of death and illness worldwide. Doctors can restore blood flow with stents or bypass surgery, but these invasive procedures carry risks, including damage caused when blood flow is suddenly restored. But what if a less invasive approach could harness the body's own repair system?

Research shows that some hearts can grow collateral arteries, natural detours that route blood around a blockage. But many heart attack patients lack enough of these backup vessels to survive the injury. Learning how to trigger their growth could save lives, but first doctors need a clear understanding of how the body builds them.

The heart powers a busy highway of arteries and vessels, providing a constant to-and-fro passage for blood. During a heart attack, this passage becomes blocked, usually when a blood clot forms on plaque in a coronary artery and cuts off blood flow to the heart muscle. A study published in Science found that the heart tries to save itself by growing new natural bypass channels to bring blood and oxygen back to damaged tissue.
For a long time, the prevailing theory was that new backup vessels, also known as coronary collateral arteries, grew when cells from existing arteries broke away and assembled into new arteries. The researchers designed genetic tools with fluorescent markers that glow in different colors depending on whether they contact the smooth muscle cells (SMCs) of mature arteries or the bare surface of capillaries, the tiniest blood vessels.

When injected into mice, the tools revealed that capillaries, rather than existing arteries, did most of the heavy lifting in forming new coronary collateral arteries after a heart attack. Capillaries changed their identity and grew into larger, fully mature arteries through a process called capillary arterialization.
The team mapped out the chain reaction inside the cells that drove the transformation of capillary cells into backup vessels. The growth signal VEGF-A activated a protein switch, YY1, which then recruited a methyltransferase protein, SETD1A, to modify the cell's DNA packaging chemically. This activated the gene HES1, which instructed simple capillary cells to reprogram themselves into mature, robust arteries.
The findings challenged a long-standing view and offered a clearer picture of how the heart builds its own backup blood vessels after a heart attack. The researchers identified capillary arterialization as central to the heart's natural effort to restore blood flow, which could be a promising new strategy for helping the heart rebuild its blood supply after injury.

Mingjun Zhang et al, Tracing the origins of de novo coronary collateral formation in cardiac repair, Science (2026). DOI: 10.1126/science.ady3027

Comment by Dr. Krishna Kumari Challa 5 hours ago

Physics behind the shape of rose thorns

Roses are known, not only for their flowers, but also for their thorns, the sharp structures that can sting and prickle the skin. Thorns, botanically known as prickles, are thought to discourage animals from feeding on plants and may also help climbing roses grip other vegetation.
Compared with the prickles found on many other plants and those artificially created by humans, rose thorns have a somewhat unusual shape. When sliced across their width, various other stingers are approximately round, yet rose prickles tend to have an oval cross section.
Researchers recently tried to better understand why roses may have evolved this unusually flat thorn geometry by running laboratory experiments with artificial prickles and skin-like materials.
Their findings, published in Journal of the Royal Society Interface, suggest that the oval shape of rose prickles could be a compromise between more stable round stingers and flattened, less stable prickles that look more like tiny blades.
When studying various stingers (i.e., sharp and pointed structures) found in nature, they realized that rose prickles differed from those of many other plants. Specifically, they found that they had an unusually flattened oval cross section, particularly when compared with the cylindrical spines of other plants such as cacti or hawthorn trees.
To understand why rose prickles are flatter than those of many other plants, the researchers created artificial stingers using a flexible silicone-based material called polydimethylsiloxane (PDMS). They ensured that these stingers differed in their cross-sectional shapes, ranging from approximately circular to increasingly narrow and flatter shapes.

They then moved the artificial stingers through gelatin using a small robot. This allowed them to determine how each prickle dragged across soft materials, including human skin.

It turned out that oval stingers are relatively better at cutting (or maybe helping the plant climb). They outperform circular prickles, which tend to bend or buckle when you shear them.
The researchers observed that circular stingers tended to bend in the direction in which they were moving, producing only superficial scratches on the gelatin. In contrast, moderately flattened stingers had a blade-like edge and enough structural stability to cut through the gelatin.

The team's results suggest that the unusual shape of rose prickles could allow them to cut better through soft surfaces.

Sabrina Gennis et al, Mechanical limits shape the eccentric form of rose prickles, Journal of the Royal Society Interface (2026). DOI: 10.1098/rsif.2025.1300.

Comment by Dr. Krishna Kumari Challa on Saturday

The researchers say the next step for this work is to understand what causes changes in the immune system between the onset of infection and the development of sepsis. Understanding these changes could help identify new treatment targets and approaches to reduce either progression to sepsis or the severity of sepsis, with the potential to improve outcomes and make a difference in the lives of millions affected by serious infections worldwide.

Temporal Analyses of Immune Responses in Sepsis Reveal Asynchrony Between Clinical stage of illness and Immune State, Immunity (2026). DOI: 10.1016/j.immuni.2026.08.003. www.cell.com/immunity/fulltext … 1074-7613(26)00325-0

Part 2

Comment by Dr. Krishna Kumari Challa on Saturday

Three shifting immune states in sepsis could explain why treatments miss their window
Researchers have mapped how the immune response in people with sepsis changes over time. The work could help pave the way for treatments that target the specific parts of the immune system that are altered over the time course (trajectory) of sepsis illness in adults.

Sepsis is a life-threatening condition that occurs when the immune response to infection misfires. In sepsis, vital organs fail, and the condition can be fatal even when treated quickly. It's estimated that there are over 160 million cases and about 21 million deaths from sepsis worldwide each year.

Current treatments for sepsis focus on treating the underlying infection with antimicrobials and providing supportive care for failing vital organs. Despite efforts to treat the misfiring immune system, none have successfully improved outcomes for patients.

In the new study, published this week in Immunity, researchers sought a more detailed understanding of the immune response mechanisms that change over time in patients with sepsis.

They analyzed blood samples collected at four different time points (between admission to and discharge from critical care) from critically ill patients with sepsis . To build a detailed picture of the immune response, called an "immune profile," the researchers examined multiple layers of immune response information in the blood samples, including data on immune cells, gene expression and changing protein expression.

Using machine learning approaches, they then combined these layers of information to generate a more comprehensive immune profile for the first time in patients with sepsis.
The analyses revealed an immune trajectory with three distinct temporal immune states (referred to as STImS) between admission and recovery, with each state involving different immune cell activity and immune response programs.

Importantly, these sepsis immune states didn't match the clinical stage of sepsis. For example, the "early" immune state (STImS1) was not the same as the early clinical stage of sepsis, which is often the day a clinician diagnoses sepsis.

The researchers say these findings could have important implications for determining how best to treat patients with sepsis—specifically, which treatments to use and when.

The main aim of this work was to build a profile of sepsis immune responses over time. When people are admitted to a hospital with sepsis, they are usually classed as having 'early' sepsis—but the new findings show that this isn't necessarily the case—their immune system may already be at later stages of the immune response. Knowing exactly what is happening to a patient's immune system during sepsis could identify which treatments are likely to work best.
This research shows the importance of looking at the changing architecture of the immune system in sepsis over time, rather than just taking a snapshot view. We need to find better ways to treat the misfiring immune system. Only by understanding the intricacies of the immune system in all its component parts—by integrating and dynamically mapping cell and molecular immunobiology to determine why the very system designed to protect us from infections is misfiring in sepsis—can we begin to improve outcomes for patients by treating the misfiring immune system, say the researchers.
part 1

Comment by Dr. Krishna Kumari Challa on Saturday

Can total joint replacement particles reach the brain?
Total joint replacement is a proven treatment to relieve chronic knee pain, but concerns have been raised that particles from the device may migrate to the brain and cause memory problems. New research from Rush University shows this may not be a concern.
In 701 deceased older adults, implant-derived wear particles were detected in brains of some people with joint replacements but were not associated with cognitive decline. Cobalt exposure was associated with greater Alzheimer disease pathology, particularly raising concern for hip implants with accelerated wear.

In a study published in Acta Biomaterialia, researchers found that particles in some people with total joint replacements traveled to the brain but did not cause cognitive decline.

Researchers did find an association between cobalt, a key element in most implants, and greater Alzheimer's disease pathology in the brain.

The particles, called wear debris, are caused by friction and movement in the joint or, in some cases, corrosion. The newer materials used in joint replacements today make this less likely to occur.

Implants have a very specific combination of metals such as cobalt, and when they show up together in one particle in the brain in the exact same composition that the implant is, we know it can't come from any other source.
For years, we've known that particles can deposit in tissues surrounding the joint, but this is the first study to look at the particles deposited in the brain.
Total joint arthroplasty remains one of the most successful and life-changing interventions in modern medicine. But it does suggest that wear particles from the implant, particularly in certain hip replacements involving accelerated wear, may travel beyond the joint and warrant further study, say the researchers.

Robin Pourzal et al, Cobalt and titanium levels in the brain are associated with Alzheimer's disease pathology but not cognition: A study of older adults with and without total joint replacement, Acta Biomaterialia (2026). DOI: 10.1016/j.actbio.2026.05.006

Comment by Dr. Krishna Kumari Challa on Saturday

Hitting bacteria hard and early with diverse phage cocktails may curb resistance

As multidrug antibiotic resistance emerges as a potent public health challenge, medical science has renewed attention on the potential for bacteriophage therapy. Bacteriophages, or phages, are viruses that target, infect and replicate inside bacteria, destroying them in the process. To help maximize the success rate of this approach, researchers recently modeled the dynamics of bacteriophage therapy to explain particular therapies and optimize the composition of bacteriophage cocktails.

Phage are the most prevalent organisms on the planet. They exist everywhere bacteria exist. However, each phage has evolved to narrowly target specific bacteria, and bacteria have evolved various mechanisms of resistance.
Phage cocktails—combinations of particular phages for a patient facing a specific bacterial infection—represent a complicated form of personalized medicine. Given the fast and complex dynamics of bacterial responses to phages, it is not typically known why a particular phage therapy succeeded or failed. As described in the journal PLOS Computational Biology, the research team developed a mathematical model that could describe effective phage cocktails and optimize their diversity and timing.
The researchers developed their mathematical model by building on an existing model calibrated with data from phage therapy in a live mouse. The mathematical model was extended to humans and included multiple phages infecting multiple bacterial strains with varying phage resistance.
The model was able to predict success based on several key factors. The bacteria's pretreatment resistance level was critical, as were the diversity of the phage cocktail and the timing of its delivery. Phage therapy is a complicated dynamic in which more infective phages can wipe out more sensitive (i.e., less resistant) bacteria faster. That leaves resistant bacteria to expand, and they can quickly evolve better resistance, mutating to avoid infection by the phage.

The team found that therapy is best served by a diversity of phages, which overwhelm the bacteria's ability to evolve resistance quickly enough. The team also focused on the timing of phage delivery, determining that immediate treatment with the full phage cocktail offered the most success. That creates a high genetic barrier to bacterial resistance, meaning that the bacteria would need to accumulate several genetic changes or mutations to survive the therapy.
The rapid evolution of resistance is the main challenge to therapy.
That capacity is why antibiotics may not work in the first place. For phage therapy to be effective, the cocktails should be diverse, sufficient and immediate. The approach amounts to 'hit the bacteria hard and early.

Rob J. de Boer et al, Towards modeling phage therapy, PLOS Computational Biology (2026). DOI: 10.1371/journal.pcbi.1014408

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