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Comment by Dr. Krishna Kumari Challa on Friday

Why air travel can be so hard on the body

At any given time, hundreds of thousands of people are traveling by air. For many, these journeys will pass without consequence. But for some, a routine flight may trigger a health emergency.
Commercial flights expose passengers to reduced cabin pressure, relative hypoxia, and very low humidity, which strain cardiopulmonary function, promote dehydration, increase blood viscosity, and elevate risk of thrombosis. Gas expansion in body cavities contributes to gastrointestinal discomfort and flatulence, while postural changes, alcohol, and dehydration increase fainting risk. Cardiac and cerebrovascular events in flight are uncommon but have worse outcomes due to limited resources. Hydration, mobility, moderated alcohol intake, and timing around surgery, dental work, or diving help mitigate these risks.

original article.

Comment by Dr. Krishna Kumari Challa on Friday

Dormant pigment cells found in vitiligo patches may offer treatment target

Vitiligo is an autoimmune disease in which the body's immune system attacks and destroys melanocytes, the cells that produce the skin pigment melanin. Once the melanocytes are gone, the skin turns white, leading to the characteristic skin patches of the disease. However, the standard model of vitiligo doesn't explain some of its unusual features. Some vitiligo lesions repigment, and treatments sometimes restore pigmentation even in areas that lack melanocytes, suggesting that the melanocytes may not be fully destroyed.
Researchers found evidence that melanocytes do not completely disappear from vitiligo skin and instead enter a "dedifferentiated-like state" in which the mature cells revert to a more primitive form, losing many of their specialized functions, including pigment production.

This study uncovers a new mechanism underlying the development of vitiligo, which could change how we treat the disease.

Vitiligo lesions contain melanocytes in a dedifferentiated, pigment-silent state rather than completely lacking these cells. Basement membrane remodeling, with a shift from laminin-211 to laminin-332 and altered adhesion via integrin α3β1, drives this state and forms a self-reinforcing loop. Pharmacological inhibition of downstream signaling partially restores mature melanocyte markers and pigmentation-related gene expression, indicating reversibility and a therapeutic target.

Fei Yang et al, Aberrant laminin signaling drives melanocyte dedifferentiation and unveils a tractable therapeutic target in vitiligo, Nature Communications (2026). DOI: 10.1038/s41467-026-72064-w

Comment by Dr. Krishna Kumari Challa on Friday

A mother's devotion to newborns begins in the brain, study suggests

In mice, prolactin activates a specific hormone-sensitive pathway projecting to the brain’s reward center, increasing dopamine release and making offspring interaction intrinsically rewarding. Artificial activation of this pathway induced maternal behaviour in nulliparous mice, whereas blocking it suppressed normal maternal interest. This mechanism links prolactin-driven neural rewiring to maternal motivation and may be relevant to peripartum mood disorders.
New research has found that a hormone is responsible for making mothers' interactions with newborns feel rewarding rather than just necessary. The study, published in Science Advances, looked at how a mother's brain changes to help her devote her energy to providing for her infant's needs.
The researchers found an essential pathway in the brain that switches on when a mother is interacting with her offspring.

In mice, it runs from a hormone-sensing part of the brain into the brain's reward center—which releases dopamine—and it's switched on by prolactin, a hormone essential for milk production that also surges after birth.

When the researchers artificially activated this part of the brain, mice that had never had pups suddenly acted like devoted new mothers. When they blocked it in mothers, their normal surge of interest in pups didn't happen.
The brain's reward system gets rewired after birth to prioritize offspring. These findings help explain how that rewiring might happen, showing that prolactin acting through this specific pathway tips the balance and makes time with a new born feel rewarding rather than just necessary.
The brain is undergoing remarkable change during pregnancy that really shapes the way we think and feel. It's not surprising that sometimes these changes can be difficult. Mothers and families need support and tools to positively shape this critical period of life.
The research will help take some stigma away from parents who struggle to bond with their baby because of their biochemistry. It points to a brain pathway that isn't switching on as expected, not a personal failing.

Jenny Clarkson et al, A prolactin-receptive neural circuit drives maternal interactions with pups in mice, Science Advances (2026). DOI: 10.1126/sciadv.ady6498

Comment by Dr. Krishna Kumari Challa on July 23, 2026 at 12:03pm

Human study links reduced inflammation to later myopia onset
Retrospective analysis of ~200 patients ≤22 years indicated that children with juvenile idiopathic arthritis receiving systemic anti-inflammatory therapy developed myopia at a later mean age (~17 years) than healthy peers (~10 years). Findings support a role for inflammation in myopia onset and suggest ocular anti-inflammatory strategies may help delay or reduce myopic progression.

Abstract: The Role of Systemic Anti-Inflammatory Agents on Refractive Development: A Retrospective Study in Children

Comment by Dr. Krishna Kumari Challa on July 23, 2026 at 12:00pm

An Australian woman gives birth to rare identical quadruplet girls

An Australian woman has given birth to identical quadruplet girls after a pregnancy doctors described as incredibly rare.
A 34-year-old Australian woman naturally conceived genetically identical female quadruplets from a single fertilized egg, an event estimated at about 1 in 15 million. All four infants, sharing one placenta and delivered by cesarean at 28+4 weeks, are reported stable in neonatal intensive care, and the mother is recovering well despite the high-risk pregnancy.
The babies were conceived naturally and came from one fertilized egg that split into four, "which was incredible".
The mother faced a high risk of complications, especially given the fetuses shared one placenta. In general, being pregnant with any multiple fetuses puts a mom at increased risk for problems such as preterm birth, miscarriage and birth defects, according to Johns Hopkins Medicine.
She was monitored by a large medical team at the hospital since 10 weeks gestation and was admitted as an inpatient at 25 weeks so she could be monitored, hospital officials said. She delivered the babies by cesarean section on July 14.

Mum did lose a little bit of blood but not an excessive amount for having quads, and she's doing well.
The babies are doing well in the neonatal intensive care unit.
Source : News Agencies

Comment by Dr. Krishna Kumari Challa on July 23, 2026 at 11:43am

Factors that affect the spininess of plants in different locations

Plants often grow spines, thorns and prickles to defend against animals that feed on them, but why this happens in some places more than others ?

Research in New Phytologist shows that plant spininess is shaped by browsing mammals, both past and present, together with environmental conditions.
Plant spininess across 2,686 species is primarily explained by the presence and historical legacy of large mammalian herbivores. Dry-season length, soil pH, and temperature further modulate the proportion of spiny species directly and via effects on herbivore richness, while fire acts only indirectly. Extinct herbivores leave a persistent signature in present-day plant defenses.

In the study of 2,686 ecologically diverse plants, including both spiny and non-spiny species, and 368 mammalian herbivores, investigators found that current and extinct large herbivores are key predictors of the prevalence of spiny species.

Dry-season length, soil pH and temperature also shaped the proportion of spiny species, both directly and indirectly through their effects on herbivore richness, whereas fire influenced spinescence only indirectly.

The  findings suggest that ecosystems can carry the influence of large herbivores long after they disappear. Many of the fauna that once shaped the evolution of plant defenses are extinct, yet their legacy remains visible in the vegetation we see today.

The complex interaction between mammalian herbivores, climate, soil and fire has shaped the evolution and distribution of plant spinescence across biogeographical realms, New Phytologist (2026). DOI: 10.1111/nph.71376

Comment by Dr. Krishna Kumari Challa on July 23, 2026 at 11:42am

OpenAI says its AI technology acted on its own in an 'unprecedented' hack of another company
OpenAI reported that a combination of its frontier models autonomously conducted a cyber intrusion into Hugging Face systems, using stolen credentials and exploiting an unknown vulnerability to obtain secret information and evade evaluation controls. Both companies indicated no human malicious intent and emphasized that AI-driven vulnerability discovery demands security and safety measures that match rapidly advancing model capabilities.

Comment by Dr. Krishna Kumari Challa on July 23, 2026 at 10:07am

Transmissible cancer cells discovered in fish act more like parasites than traditional tumours
A team of researchers has discovered that mysterious black skin lesions afflicting catfish in Lake Memphremagog and other New England and Canadian lakes are caused by a transmissible cancer—the first identified in a freshwater fish species. The cancer cells behave more like parasites than conventional tumours, moving from fish to fish.
The discovery, published in the journal Nature, sheds light on how cancer can spread in the wild and raises important questions about where this cancer originated, how it will affect fish health and populations, and how cancer works in all animals, including humans.
Since 2012, anglers and biologists have reported a striking increase in brown bullhead catfish (Ameiurus nebulosus) with raised black skin patches in the cross-border lake shared by Vermont and Quebec.

By 2014, nearly one in three fish showed the dark lesions.
The lesions turned out to be melanoma, a skin cancer.
Using whole-genome sequencing, the team compared DNA from tumors and healthy tissues in affected fish. They found that the cancer cells were much more closely related to each other than to their host fish—the signature of a clonally transmissible cancer, in which tumor cells themselves act as infectious agents.

"Hundreds of thousands of genetic variants are shared among tumor samples but absent from host fish, vastly exceeding levels seen in conventional cancers," the study reports.

This discovery marks only the fourth type of transmissible cancer in the animal kingdom—and the first in any fish or freshwater species. Previous ones include the Tasmanian devil's facial tumor disease, a transmissible venereal tumor in dogs, and transmissible leukemia-like diseases in clams, mussels and other bivalve mollusks.

The research team is now working to understand how the cancer cells spread between animals.
During spawning, bullheads cluster tightly in shallow water, allowing physical contact that could transmit tumor cells. As scaleless, bottom-dwelling fish, they also interact closely with sediment, which might harbor free-floating cancer cells. The study notes that pollutants or hormonal changes could weaken immune systems, making the lake's brown bullheads more vulnerable to infection.

Naturally occurring arsenic may also play a role.
Because Lake Memphremagog provides drinking water for more than 175,000 people, the researchers emphasize that the disease poses no known risk to humans. The cancer cells cannot infect or survive in another species, and the fish are safe to handle and study.

Julie Dragon, Brown bullhead catfish melanoma represents a novel transmissible cancer, Nature (2026). DOI: 10.1038/s41586-026-10828-6. www.nature.com/articles/s41586-026-10828-6

Comment by Dr. Krishna Kumari Challa on July 22, 2026 at 10:10am

Estrogen-like mold toxins linked to corn products found in all pregnant participants in small pilot study

Consuming common foods such as corn chips and popcorn may put pregnant women at risk of exposure to mycotoxins—harmful substances produced by mold—according to researchers.

Their study, published in the Journal of Exposure Science & Environmental Epidemiology, found hormone-mimicking mycotoxins in 100% of participants and linked exposure levels to the amount of corn and grain products consumed.
A pilot study of 33 pregnant women detected at least one estrogenic mycotoxin in every urine sample, with zearalenone present in most samples and indicating persistent exposure. Higher urinary mycoestrogen levels were strongly associated with recent intake of corn and other grain products, especially corn-based foods, and were higher among Hispanic participants, who reported greater corn and dairy consumption.
One such mycotoxin is zearalenone, a compound produced by Fusarium fungi that contaminate staple crops such as corn, wheat and oats. Zearalenone can indirectly enter human food supplies through meat and dairy from animals that eat contaminated feed. It is also heat-stable, so it can survive cooking and food processing.

Because zearalenone can mimic estrogen, a hormone critical to pregnancy and fetal development, it is more specifically classified as a mycoestrogen. Other studies suggest that exposure to mycoestrogens may contribute to greater gestational weight gain and lower infant birth weight.
The research findings confirm that grain-based foods are important contributors to mycoestrogen exposure among pregnant women.
Researchers found that consumption of corn and other grain products in the 24 hours before a urine sample was collected was strongly associated with higher mycoestrogen levels.

Corn-based foods, including corn, corn chips and corn tortillas, showed the strongest associations, followed by more modest links to cereal grains and oils. By contrast, consumption of chicken and pork showed weaker, inverse associations, suggesting corn and grain products, rather than meat, were the primary dietary contributors to exposure in this study group.

Zorimar Rivera-Núñez et al, Diet and mycoestrogen exposure in a pregnancy cohort: the Jersey Babies pilot study, Journal of Exposure Science & Environmental Epidemiology (2026). DOI: 10.1038/s41370-026-00940-0

Comment by Dr. Krishna Kumari Challa on July 22, 2026 at 9:22am

Sudden cardiac death condition shown to have linked genetic variations

Scientists have found that the "sudden" cardiac death condition related to high-profile deaths or major medical episodes of sports stars including Fabrice Muamba, Christian Erikson and Mark-Vivian Foe, has numerous linked gene variations that highlight a potentially treatable vulnerability.
In a study published in Nature Communications, a multi-disciplinary team of researchers have uncovered new insights into how "spelling mistakes" in our DNA contribute to hypertrophic cardiomyopathy (HCM), a leading cause of sudden cardiac death worldwide.

"Spelling mistakes" in a protein called alpha-actinin-2 or ACTN2 have previously been identified for their role in the disease, but they have not addressed how these errors lead to cardiac arrest. This study found that 17 of the spelling mistakes in ACTN2 are linked to HCM, and that they affected the protein in different ways.
In the study, structural and cell biologists teamed up to investigate 17 mistakes in ACTN2 using a range of experimental methods and found that they affect the protein in several different ways. Some errors made the protein less stable, more likely to clump together, or less able to interact with other molecules.

Researchers have also found that these spelling mistakes have different effects depending on where they are located within ACTN2. In particular, a critical region called the Actin Binding Domain (ABD), which helps ACTN2 interact with other parts of cells and is important for major cell processes, was identified as a key hotspot for changes caused by these spelling mistakes.
The findings will help us and other researchers worldwide to find potential ways to address these genetic weaknesses and better understand how these proteins are literally reshaping the hearts of people with this condition.

Comprehensive biophysical and structural profiling of alpha-actinin-2 variants reveals mechanistic diversity in hypertrophic cardiomyopathy, Nature Communications (2026). DOI: 10.1038/s41467-026-75392-z

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