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Comment by Dr. Krishna Kumari Challa 4 hours ago

Partial Vision Restored in Some Blind Patients With New Experimental Treatment
Night vision often fades first, followed by a narrowing of peripheral vision. In retinitis pigmentosa, this progressive loss can eventually lead to blindness.

An experimental treatment has now helped some patients recover limited visual abilities.

The approach combines a gene injection with special goggles. In a small trial involving 10 people with profound vision loss in both eyes, some participants became better able to detect objects, locate them, and reach toward them while using the device.
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Retinitis pigmentosa is a group of inherited disorders in which genetic changes damage the retina's photoreceptors, the cells that normally detect light.

Symptoms can begin in childhood or later, and progression varies. People without known affected relatives can also develop the disease.

Variants in more than 100 genes can cause it, complicating efforts to develop treatments for each genetic cause. This approach, called optogenetic therapy, gives nerve cells that survive the disease a new way to respond to light.

Each participant received one injection into their worse-seeing eye. A modified virus delivered instructions for producing a light-sensitive protein called ChrimsonR into retinal ganglion cells, the nerve cells that transmit visual signals toward the brain.

The gene therapy delivers a light sensor to the blind retina, making it light-sensitive again. The goggles provide light stimulation at the wavelength to which this sensor responds.
A camera in the goggles captures changes in brightness. A processor turns those changes into patterns of amber light, which a projector directs onto the retina to activate the protein.
In addition, the goggles adapt to outside light conditions and modify the signal to ensure optimal stimulation of the retina.
Participants practiced using the goggles. During visual tests, their untreated eye was covered.

The trial primarily assessed safety, but researchers also examined light sensitivity and object detection.

They measured the dimmest light participants could detect through the goggles before and after treatment. Seven showed increased sensitivity, ranging from about twofold to 62-fold. Six reached roughly a fourfold increase or more, which the team considered clinically meaningful.
Differences between patients in the increase in sensitivity may reflect how well the gene therapy vector reaches the retinal cells, or how many retinal cells remain, or other variables such as training to wear the goggles.
Brain recordings from five selected participants supported the possibility that visual signals reached the brain. Four had already responded in behavioural tests. For some estimates, the confidence interval included zero.

https://www.nejm.org/doi/10.1056/NEJMoa2602215

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Comment by Dr. Krishna Kumari Challa 4 hours ago

Why butterflies are so hard to catch

Butterflies are incredibly evasive insects, with no predators that specialize in hunting them as they fly. Why this is has been a bit of a mystery, but now new research suggests that the patterns on their wings create optical illusions to mislead predators. This finding not only explains butterflies nimble dodging, but may also help researchers understand why many animals have stripes and patterns.

Comment by Dr. Krishna Kumari Challa 4 hours ago

Introduced species aren't good or bad—they are labeled according to human interests
Animal classifications in Australia reflect human interests as well as ecological impacts. Introduced species can harm biodiversity, but valued livestock also cause damage, and native species can become invasive outside their bioregions. Context-specific management is proposed as an alternative to treating species as inherently good or bad.

original article.

Comment by Dr. Krishna Kumari Challa 4 hours ago

Sustained pressure halts cancer cell migration and triggers death in 3D lab models

In 3D models, sustained mechanical confinement halted migration and induced death in cancer cells undergoing the mesenchymal-to-amoeboid transition. Physical pressure activated MLKL-mediated necroptosis, linking mechanical stress to programmed cell death.

Long-term confinement triggers RIPK3-independent necroptosis in amoeboid cancer cells to shape tumor evolution, Developmental Cell (2026). DOI: 10.1016/j.devcel.2026.09.003

Comment by Dr. Krishna Kumari Challa 5 hours ago

Microplastics are chemically active and could cause biological harm

Plastics are supposed to be chemically inert. It's the reason they're used so frequently to package food, bottle water and create children's toys: They're safe. But something important happens when a large piece of plastic fragments into micro- and nanoparticles. Its surface area increases dramatically relative to its volume. Vastly more of the material is now exposed to its surroundings.

A new study by researchers from Columbia University and the University of California, Berkeley, found that this newly created surface is not necessarily safe and identified the chemical reasons why.

As plastic fragments into smaller and smaller particles, its surface area increases enormously. Then microplastics change the water that surrounds them, generating high-energy, reactive radicals (reactive oxygen species, ROS) that very likely contribute to biological damage that we see in animals and potentially in humans as a result of microplastic exposure.

This is particularly noteworthy for human health because human blood is approximately 50% water, and individual human cells are generally 60% to 80% water. The new research suggests that microplastics that enter the bloodstream or cells could remain chemically active in this water-rich biological environment.

The research found that when microplastics interact with water, as they do when they're in bottled water, or when they're absorbed into our bloodstream, they spontaneously generate what we call reactive oxygen species (ROS).

ROS are textbook examples of the kinds of molecules that can damage animal and human tissue.

Water is a key active player here, rather than just a spectator. It's integral to making these microplastics reactive. Water molecules become chemically active when they come into contact with plastic, which is hydrophobic. Contact between the water and plastic creates an environment that facilitates electron transfer and the formation of reactive radicals. When plastics fragment into smaller particles, their increasing surface-to-volume ratio creates more of these chemically active areas.

The work challenges the common view of microplastics as largely passive fragments of inert material and contributes to a growing understanding of why the large-scale presence of microplastics is a cause for concern. The research was published recently in the journal Nature.

Wei Min, Intrinsic physicochemical activity at microplastic–water interfaces, Nature (2026). DOI: 10.1038/s41586-026-11141-y. www.nature.com/articles/s41586-026-11141-y

Comment by Dr. Krishna Kumari Challa 6 hours ago

The authors hypothesized that the targeting of DNA repair proteins by these autoantibodies could provide a phenotype resembling what we see for related proteins with defective hereditary variants that cause a predisposition to cancer.

When the autoantibodies enter a cell or its nucleus, they could bind to and immobilize or directly inhibit the targeted proteins and thus hinder normal DNA repair. Such weakened repair might in turn cause pediatric cancer.

In follow-up experiments, the scientists were able to show that these autoantibodies can enter cells, especially during the phase when cells end their growth and prepare to divide. Inside the cell, they seem to home in on the TIGER organelle, a site where transcription factors and other short-lived but essential proteins are produced and modified.

"[These results] together provide a plausible mechanism for increased cellular damage that could lead to cancer development," concluded the authors in their research paper.
But what might trigger the production of antibodies against normal DNA repair proteins?

They could be triggered by infections, by cross-reacting to some microbial proteins or overstimulation of the immune response, or by some imbalance in immune tolerance.
The results point to the possibility of screening children to detect any autoimmune predisposition to cancer early, with the hope of preventing their later progression to the disease or detecting it early.

Pathogenic autoantibodies targeting DNA repair proteins are shared by cancer patients and healthy children later diagnosed with cancer, Frontiers in Immunology (2026). DOI: 10.3389/fimmu.2026.1911932

Part 2

Comment by Dr. Krishna Kumari Challa 6 hours ago

Abnormal antibodies that disrupt DNA repair could explain childhood cancer

Why do children get cancer?
Pediatric cancers, such as leukemia, myeloma, neuroblastoma and osteosarcoma, differ from adult cancers in their causes, location and type, and response to therapy.

Compared to adults, children have had less time to accumulate cancerous DNA damage through exposure to environmental stressors, lifestyle factors and aging. Paediatric cancers thus tend to carry fewer mutations than adult ones and arise from less mature cells, for example, stem or progenitor cells.

A team of scientists has now found evidence for a new mechanism for the development of cancer in children: They seem to produce an unusual amount of aberrant antibodies against the building blocks that make up the DNA repair machinery, a diverse set of hundreds of proteins that identify and correct damage or errors in the genome.
This discovery could open the door to the early screening of small children, in the hope of ultimately preventing them from developing such paediatric cancers in their teenage years.
The researchers showed that many children with various types of cancer have antibodies against some of their own DNA repair proteins. They also demonstrated that such 'autoantibodies' can enter live cells and bind to—and probably inhibit—the activity of these essential proteins.

The results showed that compared to young adults and older people, children between 2 and 19 years of age with pediatric cancer had much greater numbers of antibodies of the IgG class against DNA repair proteins circulating in their blood. These autoantibodies mainly targeted RAD52, NUMA1, ALKBH7, APBB1, UNG and MGMT, all key genes closely involved in DNA repair but not significantly mutated in these cancers.

Could these autoantibodies explain why these children had developed cancer? To find out, the scientists looked at selected samples from 59 school-age children who had taken part in the British "Avon Longitudinal Study of Parents and Children" and "Born in Bradford" long-term cohort studies. Half of these children had developed cancer years later (but before the age of 30 years), while the other half had not.
They were able to show that indeed, children who later got cancer (on average six years after blood sampling) were about eight times more likely than their healthy peers to have antibodies to at least one core antigen involved in DNA repair.
Part 1

Comment by Dr. Krishna Kumari Challa 6 hours ago

Those analyses painted a consistent picture: The ovary continues to change well after its reproductive life ends.

Ovaries of younger postmenopausal women had more proteins involved in maintaining cells and tissue structure, while older ovaries had more proteins associated with inflammation, immune activity and the ongoing breakdown and rebuilding of the tissue surrounding cells. The differences were most pronounced between ovaries of women in their 50s and those of women 70 and older.

When scientists analyzed the data in multiple different statistical ways, what became clear across all these methodologies is that the ovary was not stagnant.
In fact, over the decades, there were quite dramatic differences: Some proteins' levels would go up with age and some proteins' levels would go down, which tells us this organ is quite dynamic.
The aging ovaries also showed some of the same molecular patterns seen in cellular senescence, a state in which aging or damaged cells stop dividing but remain biologically active and can send signals that affect surrounding tissue.
As postmenopausal ovaries aged, proteins involved in maintaining tissue structure declined, while proteins involved in inflammation and reshaping the tissue environment became more prominent.

Although all the ovarian tissue in the study appeared normal and cancer-free, some proteins previously associated with ovarian cancer were more abundant in aging ovaries, with the strongest signal among women in their 60s. The finding does not mean the ovaries were cancerous or precancerous, but suggests healthy ovarian aging and ovarian cancer share some of the same biological processes.

It's not that all postmenopausal women get ovarian cancer, but we know that that fibrotic inflammatory environment is certainly an environment that cancer cells prefer to home in on.
This is all consistent with the idea that the aging ovary is a potential third hit for ovarian cancer, with the first hit being genetic and the second hit being environmental.

Mark A. Watson et al., The Human Ovary Exhibits Dynamic Molecular Remodeling in the Decades Post-Menopause, Aging Cell (2026). On bioRxiv DOI: 10.64898/2026.03.26.714635

onlinelibrary.wiley.com/doi/Mark A. Watson et al., The Human Ovary Exhibits Dynamic Molecular Remodeling in the Decades Post‐Menopause, Aging Cell (2026). DOI: 10.1111/acel.70714

Part 2

Comment by Dr. Krishna Kumari Challa 6 hours ago

Ovaries remain active decades after menopause, study reveals

Contrary to popular belief, the postmenopausal ovary is not defunct. In a new study of ovaries from 28 women, scientists found that in the decades well past menopause, the ovary remains biologically active and continues to remodel with age, showing increased inflammation and changes in tissue structure. The study also found a molecular link between ovarian aging and cancer.
In the ovary, we reach a point of no return with respect to fertility in which it's no longer producing eggs, and most people assume those ovaries are just sitting there doing nothing, similar to the appendix.
The findings challenge the notion that the ovary is an innocent bystander after reproduction ends, raising new questions about whether it could play a more active role in aging and chronic disease in women.

The ovary is not just a reproductive organ. It really influences how somebody ages because it speaks to all these other organs, such as the brain, and also to the bone, and women after menopause often experience a lot of bone problems. So, researchers think there is a connection between all these organs.
Women now routinely live for decades after menopause, making it increasingly important to understand what the ovary is doing during this long post-reproductive period.
The new data point to progressive aging features in which the ovary appears to lose its original identity and ends up doing something different.
To find out what was changing, the scientists went beyond ovarian hormones to analyze the composition of the tissue at high resolution.
Part 1

Comment by Dr. Krishna Kumari Challa 6 hours ago

The next puzzle was to untangle how a fatty acid could help clear cholesterol from blood.

Experiments showed that pentadecanoic acid binds to and inhibits HMG-CoA reductase, an enzyme needed to make cholesterol. As cholesterol production fell, liver cells increased their supply of LDL receptors: proteins that capture cholesterol-carrying particles from the bloodstream.

The two effects worked together. The liver made less cholesterol and took in more from circulating blood.

The researchers tested that explanation by disabling LDL receptor production specifically in the mouse liver. Without those receptors, neither the bacterium nor the fatty acid provided its usual protection against plaque buildup.

Changing the bacterium supplied another check. Engineered strains that made less pentadecanoic acid still colonized the gut but offered substantially weaker protection. That finding helped connect the bacterial product to the arterial benefit.
Pentadecanoic acid is a saturated fatty acid found in foods such as dairy fat. The study strengthens the evidence that gut microbes also supply it, but showing a protective mechanism in mice does not establish a treatment for people.

Human findings offer reasons to investigate further, alongside reasons for caution. A small 2024 trial in women with fatty liver disease found that adding pentadecanoic acid to a Mediterranean-style dietary intervention further reduced LDL cholesterol. However, a 2026 analysis of two long-running studies found no association between higher blood levels of the molecule and a lower incidence of cardiovascular disease.

The molecule is already marketed as a heart-health supplement. Yet the clinical evidence supporting a cardiovascular benefit remains limited.
It should be noted that the new experiments used only male mice, and human diets and gut communities could change the response seen in the animal experiments.

Chao Yin et al., A gut microbial odd-chain fatty acid alleviates atherosclerosis in mice, Nature (2026). DOI: 10.1038/s41586-026-11142-x

Part 2

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