The research article “Transcriptional Profiling at Single-cell Resolution Reveals Diversity and Regulatory Networks of Primary and Secondary Senescent Cells” by Jang, Shim, et al. models primary sene…
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How early brain activity may shape speech-linked circuits before babies ever speak
Communication begins long before children learn to speak. Researchers at National Yang Ming Chiao Tung University (NYCU) in Taiwan have now uncovered how early brain activity helps build developing communication circuits via regulating FOXP2/Foxp2, a gene linked to human speech and communication disorders.
Published in EMBO Reports, the study presents an integrated framework linking neural activity, vocal circuit development, and activity-dependent regulation of Foxp2 in early life. The researchers studied neonatal mice, which emit ultrasonic vocalizations when separated from their mothers. These vocalizations are widely used to study early social communication and neurodevelopmental disorders.
Using advanced activity tagging, live neural recording, and circuit manipulation techniques, the NYCU team identified a previously underappreciated communication circuit linking the ventromedial prefrontal cortex (vmPFC) and the striatum.
3D epithelial cell topology tunes signaling range to promote precise patterning
Cell behaviors in multicellular organisms are coordinated via both diffusible molecules and by signals based on direct cell–cell contacts. The mode of cell communication used influences the signaling range. In many developing epithelia, contact-based Notch-Delta lateral inhibition signaling is used to pattern cell fates. While previous work revealed that cells can use protrusions to extend the range of Notch-Delta signaling to alter these patterns, this is not a general feature of epithelia. In addition, it is not known how the complex three-dimensional (3D) shapes of epithelial cells influence cell communication. In exploring this question, we show that epithelial cells at the Drosophila wing margin, which lack basal protrusions, contact different neighbors at different heights along their apico-basal axis, effectively increasing the number of neighbors each cell touches.
New lithium-plasma engine passes key Mars propulsion test
You’re on the fourth human mission to Mars, and you’re told the Odyssey spacecraft designed to take you there will be the smoothest ride you’ll ever take. It features a newly christened electric propulsion engine which was in the late stages of testing during the first three missions. The mission starts and the spacecraft travels at a crawl, and you wonder if it’s broken. A week goes by and you’re now traveling at more than 400,000 kilometers (250,000 miles) per hour, and your mind is blown as to how fast you’re going, how quickly that happened, and that this mission might be more awesome than you thought.
This scenario is quite possibly a decade away, at minimum, but that’s not stopping the bright minds at NASA from building and testing next-generation propulsion systems designed to take humans to Mars one day and send spacecraft across the solar system. This is because NASA engineers recently tested a next-generation electric propulsion system that achieved new records while requiring lithium metal vapor for fuel and holds the potential to be a game changer in propulsion systems for the future of space exploration.
In a remarkable achievement, the tests successfully set a new record in the United States of 120 kilowatts of power, which is estimated to be 25 times greater than NASA’s Psyche spacecraft, which is currently en route to asteroid 16 Psyche and contains the most powerful electric thrusters ever built.
Dietary fats shape pancreatic cancer risk via ferroptosis
For decades, the relationship between fat and cancer has been treated as a question of quantity: Eat less fat, reduce your risk of developing cancer. But new research published April 29 in Cancer Discovery shows that for pancreatic cancer, the type of fat you consume matters more than the amount.
“It’s really the type of fat that you’re consuming, not just total fat content,” says Christian Felipe Ruiz, Ph.D., an associate research scientist in YSM’s Department of Genetics and lead author of the study. “Depending on the type of fat that you consume, it can go completely different ways. We found that some fats promote cancer, as we would expect, while other fats are really good at suppressing cancer.”
One fat in particular—oleic acid, the primary fatty acid in olive oil—may be accelerating tumor growth in ways scientists never anticipated. The result was surprising given oleic acid’s reputation in medicine. “It’s traditionally been considered a healthy type of fat for cardiovascular health,” Ruiz says.
Age does not appear to drive cardiovascular risk in pregnancy
Underlying cardiovascular risk, rather than older age, drives complications such as venous thromboembolism, cardiomyopathy and heart failure during pregnancy, according to new Weill Cornell Medicine research. The findings may encourage doctors to more actively address cardiovascular health in patients before they become pregnant.
The study, published in Nature Communications, suggests that instead of pregnancy becoming inherently riskier as people get older, it amplifies a person’s baseline cardiovascular risk, regardless of age.
“Pregnancy seems to be a uniform stress test, so to speak,” said the study’s lead author, Dr. Hooman Kamel, vice chair of clinical research and chief of neurocritical care in the Department of Neurology and the Helen and Albert Moon Professor of Neurology at Weill Cornell Medicine.
Gleaning Information from Noise
Researchers derive a universal limit linking noise and response to perturbations in systems far from equilibrium.
Noise comes in many forms. A microscopic bead twitches in an optical trap; voltage fluctuations flicker through a circuit. But it’s not only a nuisance. Since 1966, physicists have understood that for systems in thermal equilibrium, such randomness also gives valuable information: Spontaneous fluctuations and the system’s response to external perturbations are locked together, frequency by frequency, according to the so-called fluctuation–dissipation theorem (FDT) [1]. That link is the basis of noise-based thermometry, microrheology, and many calibration methods. But thermal equilibrium is rare in the real world. Rather, most physical and biological systems are driven by an external force, fed, or alive, with energy continually flowing through them.
Ultrafast switching device unlocks low-power optical-to-electrical conversion for AI hardware
Modern energy demands are soaring as technologies like AI and IoT become more common, and researchers have been working hard to develop hardware that can keep up. Now, a team of researchers from the University of Tokyo has developed an ultrafast and energy-efficient nonvolatile switching device, described in an article published in the journal Science, that may soon be able to significantly reduce power consumption for high-energy demand technologies.
Currently, most nonvolatile switching devices for data processing architectures have operating speeds in the nanosecond range. However, faster speeds are required for modern central processing units (CPUs), which operate in the gigahertz range.
At 5 GHz, a single cycle lasts only 200 picoseconds. If a switching device takes a nanosecond (1,000 picoseconds) to turn on or off, it misses multiple clock cycles, creating a major bottleneck that prevents the processor from operating continuously at full capacity. Optical interconnects are being explored to overcome electronic bottlenecks, but more efficient optical-to-electrical (O/E) conversion is still needed.
A new way to recharge aging muscle stem cells by restoring a key metabolic component
Losing muscle strength is a natural part of aging. At the core of this decline is a drop in the number of muscle stem cells (MuSCs), the specialized cells responsible for maintaining and regenerating muscle tissue throughout our lives. Loss of muscle strength can severely affect mobility, increasing the risk of falls, fractures and, most importantly, the loss of independence.
Published in Nature Aging, a recent study took a crucial first step toward restoring stem cell function in aging muscles—gaining a clearer understanding of how metabolism changes when stem cells are activated and how these critical processes weaken with age.
The researchers’ investigation led them to glutamine metabolism, the process by which cells use the amino acid glutamine to support essential functions. They found that for MuSCs, glutamine is more than just a nutrient. It provides the raw material needed to produce fatty acids that help cells grow, divide, and repair damaged muscles.