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Comment by Dr. Krishna Kumari Challa on August 16, 2025 at 6:54am

Scientists reveal how senses work together in the brain

It has long been understood that experiencing two senses simultaneously, like seeing and hearing, can lead to improved responses relative to those seen when only one sensory input is experienced by itself. For example, a potential prey that gets visual and auditory clues that it is about to be attacked by a snake in the grass has a better chance of survival.

Precisely how multiple senses are integrated or work together in the brain has been an area of fascination for neuroscientists for decades. New research has revealed some new key insights.

Research participants were asked to watch a simple dot animation while listening to a series of tones and press a button when they noticed a change in the dots, the tones, or both.

Using EEG, the scientists were able to infer that when changes happened in both the dots and tones, auditory and visual decision processes unfolded in parallel but came together in the motor system. This allowed participants to speed up their reaction times.

Researchers found that the EEG accumulation signal reached very different amplitudes when auditory versus visual targets were detected, indicating that there are distinct auditory and visual accumulators.

Using computational models, the researchers then tried to explain the decision signal patterns as well as reaction times. In one model, the auditory and visual accumulators race against each other to trigger a motor reaction, while the other model integrates the auditory and visual accumulators and then sends the information to the motor system. Both models worked until researchers added a slight delay to either the audio or visual signals.

Then the integration model did a much better job at explaining all the data, suggesting that during a multisensory (audiovisual) experience, the decision signals may start on their own sensory-specific tracks but then integrate when sending the information to areas of the brain that generate movement.

The research provides a concrete model of the neural architecture through which multisensory decisions are made. It clarifies that distinct decision processes gather information from different modalities, but their outputs converge onto a single motor process where they combine to meet a single criterion for action.

 Distinct audio and visual accumulators co-activate motor preparation for multisensory detection, Nature Human Behaviour (2025). DOI: 10.1038/s41562-025-02280-9

Comment by Dr. Krishna Kumari Challa on August 16, 2025 at 6:49am

Comment by Dr. Krishna Kumari Challa on August 16, 2025 at 6:45am

Human embryo implantation recorded in real time for the first time

Researchers have captured unparalleled images of a human embryo implanting. This is the first time that the process has been recorded in real time and in 3D.

Failure of the implantation process in the uterus is one of the main causes of infertility, accounting for 60% of spontaneous abortions. Until now, it had not been possible to observe this process in humans in real time, and the limited available information came from still images taken at specific moments during the process.

The researchers have observed that human embryos burrow into the uterus, exerting considerable force during the process. These forces are necessary because the embryos must be able to invade the uterine tissue, becoming completely integrated with it. It is a surprisingly invasive process. Although it is known that many women experience abdominal pain and slight bleeding during implantation, the process itself had never been observed before. 

To advance during implantation, the embryo releases enzymes that break down the surrounding tissue. However, it is also known that force is required in order to penetrate the underlying layers of the uterus. This fibrous tissue is filled with collagen, a rigid protein that also forms tendons and cartilage.

The embryo opens a path through this structure and begins to form specialized tissues that connect to the mother's blood vessels in order to feed.

The research team's results reveal that human embryos exert traction forces on their environment, remodeling it. The embryo pulls on the uterine matrix, moving and reorganizing it. It also reacts to external force cues. Researchers hypothesize that contractions occurring in vivo may influence embryo implantation.Thus, effective embryo invasion is associated with optimal matrix displacement, highlighting the importance of these forces in the implantation process.

Improving our understanding of the implantation process could have a significant impact on fertility rates, embryo quality and the time taken to conceive through assisted reproduction.

Traction force and mechanosensitivity mediate species-specific implantation patterns in human and mouse embryos, Science Advances (2025). DOI: 10.1126/sciadv.adr5199

Comment by Dr. Krishna Kumari Challa on August 15, 2025 at 12:34pm

Astronomers discover new type of supernova triggered by black hole-star interaction

Astronomers have discovered what may be a massive star exploding while trying to swallow a black hole companion, offering an explanation for one of the strangest stellar explosions ever seen.

The discovery was made by an Astrophysicist team. The results are published in The Astrophysical Journal.

The blast, named SN 2023zkd, was first discovered in July 2023 by the Zwicky Transient Facility. A new AI algorithm designed to scan for unusual explosions in real time first detected the explosion, and that early alert allowed astronomers to begin follow-up observations immediately—an essential step in capturing the full story of the explosion. By the time the explosion was over, it had been observed by a large set of telescopes, both on the ground and from space.

The scientists think the most likely interpretation is that the massive star was locked in a deadly orbit with the black hole. As energy was lost from the orbit, their separation decreased until the supernova was triggered by the star's gravitational stress as it partially swallowed the black hole.

Analysis shows that the blast was sparked by a catastrophic encounter with a black hole companion, and is the strongest evidence to date that such close interactions can actually detonate a star.

An alternative interpretation considered by the team is that the black hole completely tore the star apart before it could explode on its own. In that case, the black hole quickly pulled in the star's debris and supernova emission was generated when the debris crashed into the gas surrounding it. In both cases, a single, heavier black hole is left behind.

A. Gagliano et al, Evidence for an Instability-induced Binary Merger in the Double-peaked, Helium-rich Type IIn Supernova 2023zkd, The Astrophysical Journal (2025). DOI: 10.3847/1538-4357/adea38. iopscience.iop.org/article/10. … 847/1538-4357/adea38.

Comment by Dr. Krishna Kumari Challa on August 15, 2025 at 12:31pm

To test out the effect of EPIC1 knockdown, the researchers used "humanized mice"—mice with human immune systems implanted to mimic the effect of the mechanism in a human. Using these mouse models along with RNA interference to knock down EPIC1 in various cancer cell lines, they found that targeting EPIC1 enabled reduced tumor growth and increased T cell and inflammatory macrophage infiltration. This led to a significant improvement in the efficacy of pembrolizumab in TNBC.

"EPIC1 can be a potential therapeutic target in combination with immunotherapy. Coculture assays of T cells or monocytes with cancer cells showed that EPIC1 knockdown could significantly increase the therapeutic effect of pembrolizumab through antitumor T cell and macrophage activation," the researchers write.

This is a promising result, offering hope for more effective treatments for aggressive cancers with limited options. However, the study authors note that these results still need to be tested out in human models and with other types of cancers to determine how best to improve immunotherapy outcomes in the future.

 Dhamotharan Pattarayan et al, The lncRNA EPIC1 suppresses dsRNA-induced type I IFN signaling and is a therapeutic target to enhance TNBC response to PD-1 inhibition, Science Signaling (2025). DOI: 10.1126/scisignal.adr9131

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Part 2

Comment by Dr. Krishna Kumari Challa on August 15, 2025 at 12:30pm

Scientists reverse immunotherapy-resistance by suppressing EPIC1 in mouse model of breast cancer

Immunotherapy employs patients' own immune systems to fight cancer, and it has shown itself to be an effective treatment in many cases. However, some cancers, like triple-negative breast cancer (TNBC), show resistance to immunotherapy. This occurs when tumor cells find ways to evade immune detection—like suppressing immune signaling pathways. One such mechanism is the use of long noncoding RNAs (lncRNAs), which have been found to regulate cancer biology and immune evasion. These lncRNAs render immunotherapies, like the PD-1 inhibitor, pembrolizumab, ineffective.

The good news is that if these mechanisms of immunotherapy-resistance can be identified, scientists may be able to reverse or inactivate them. In a new study, published in Science Signaling, scientists focus on the lncRNA, EPIC1, and its interaction with histone methyltransferase, EZH2, a known contributor of tumor immune evasion in cancer cells.
According to the researchers, they sought to investigate the mechanism by which EPIC1 modulates immune function and determine how it regulates the expression of retroelements (REs)—mobile DNA sequences that produce double-stranded RNA when activated—and dsRNA accumulation in tumor cells.

The researchers found that EPIC1 suppresses the accumulation of cytoplasmic dsRNA and type I interferon (IFN) responses in multiple cancer cell lines, including breast cancer, prostate cancer, and pancreatic cancer. EPIC1 and EZH2 were also shown to work together to repress the expression of immunogenic REs, suggesting a shared pathway for immune evasion.

The study authors write, "Collectively, these results suggest that EPIC1 suppression promotes an antiviral-like type I IFN response with potential antitumor effects."

Comment by Dr. Krishna Kumari Challa on August 14, 2025 at 11:08am

A Case of Bromism Influenced by Use of Artificial Intelligence

Man Hospitalized With Psychiatric Symptoms Following AI Advice

A man who followed a chatbot's health plan ended up in hospital after giving himself a rare form of toxicity.

The story began when the patient decided to improve his health by reducing his intake of salt, or sodium chloride. To find a substitute, he did what so many other people do nowadays: he asked ChatGPT on line.

OpenAI's chatbot apparently suggested sodium bromide, which the man ordered online and incorporated into his diet.

While it is true that sodium bromide can be a substitute for sodium chloride, that's usually if you're trying to clean a hot tub, not to make your fries tastier. But the AI neglected to mention this crucial context.

Three months later, the patient presented to the emergency department with paranoid delusions, believing his neighbour was trying to poison him.

In the first 24 hours of admission, he expressed increasing paranoia and auditory and visual hallucinations, which, after attempting to escape, resulted in an involuntary psychiatric hold for grave disability.

After he was treated with anti-psychosis drugs, the man calmed down enough to explain his AI-inspired dietary regime. This information, along with his test results, allowed the medical staff to diagnose him with bromism, a toxic accumulation of bromide. Bromide levels are typically less than around 10 mg/L in most healthy individuals; this patient's levels were measured at 1,700 mg/L. Bromism was a relatively common condition in the early 20th century, and is estimated to have once been responsible for up to 8 percent of psychiatric admissions. But cases of the condition drastically dropped in the 1970s and 1980s, after medications containing bromides began to be phased out.

Following diagnosis, the patient was treated over the course of three weeks and released with no major issues.

It is important to consider that ChatGPT and other AI systems can generate scientific inaccuracies, lack the ability to critically discuss results, and ultimately fuel the spread of misinformation.

https://www.acpjournals.org/doi/10.7326/aimcc.2024.1260

Comment by Dr. Krishna Kumari Challa on August 14, 2025 at 10:16am

Electrical implant approved for arthritis
A 2-centimetre implant that suppresses the symptoms of rheumatoid arthritis is the first electrical device approved to treat an autoimmune condition. The chip, called a Setpoint System, is implanted into a person’s neck and sends electrical pulses through the vagus nerve. In people with rheumatoid arthritis, these signals tell the immune system to stop attacking the joints. Similar implants are now in clinical trials for other autoimmune conditions, including lupus and inflammatory bowel disease.

https://www.smithsonianmag.com/smart-news/new-implanted-device-coul...

Comment by Dr. Krishna Kumari Challa on August 14, 2025 at 10:13am

Why some wounds heal without scars
Some parts of our bodies — such as the insides of the mouth and uterus — heal without scarring. Now researchers are delving into why this happens, and how it might help to head off some of the downsides of scars. The team compared mouth and face skin and found that, in mice, specialized skin cells communicate differently during healing: in mouth cells, a cell signaling pathway and a protein seem to prevent the formation of scars. Samples of human skin biopsies seem to back up the findings.

https://www.science.org/doi/10.1126/scitranslmed.adk2101?utm_source...

Comment by Dr. Krishna Kumari Challa on August 14, 2025 at 9:26am

Maternal microbes play a significant role in shaping early brain development, study suggests

Research finds that microbes play an important role in shaping early brain development, specifically in a key brain region that controls stress, social behaviour, and vital body functions.

The study, published in Hormones and Behavior, used a mouse model to highlight how natural microbial exposure not only impacts brain structure immediately after birth but may even begin influencing development while still in the womb. A mouse model was chosen because mice share significant biological and behavioural similarities with humans and there are no other alternatives to study the role of microbes on brain development. 

This work is of significance because modern obstetric practices, like peripartum antibiotic use and Cesarean delivery, disrupt maternal microbes.

At birth, a newborn body is colonized by microbes as it travels through the birth canal. Birth also coincides with important developmental events that shape the brain.

The research team focused on a brain region called the paraventricular nucleus of the hypothalamus (PVN), which plays a central role in regulating stress, blood pressure, water balance, and even social behavior. Their previous work had shown that mice raised without microbes, or germ-free mice, had more dying neurons in the PVN during early development. The new study set out to determine whether this increased cell death translated to changes in neuron number in the long run, and if any effects could be caused by the arrival of microbes at birth or if they began in the womb via signals from maternal microbes.

. The researchers used a cross-fostering approach. Germ-free newborn mice were placed with mothers that had microbes and compared them to control groups. When the brains of these mice were examined just three days after birth, the results were striking: All mice gestated by germ-free mothers had fewer neurons in the PVN, regardless of whether they received microbes after birth. The team also found that germ-free adult mice had fewer neurons in the PVN.

This study shows that microbes play an important role in sculpting a brain region that is paramount for body functions and social behavior. In addition, the study indicates that microbial effects start in the womb via signaling from maternal microbes.

Rather than shunning our microbes, we should recognize them as partners in early life development. They're helping build our brains from the very beginning, say the researchers

 Yvonne C. Milligan et al, The microbiota shapes the development of the mouse hypothalamic paraventricular nucleus, Hormones and Behavior (2025). DOI: 10.1016/j.yhbeh.2025.105742

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