Hundreds of cubes of human brain tissue help scientists to chart the energy-making capabilities of various brain regions.
Category: biotech/medical – Page 203
Microbial micronutrient sharing, gut redox balance and keystone taxa as a basis for a new perspective to solutions targeting health from the gut
The first couple of months of life is a critical window for microbiome development. Several factors, such as mode of delivery, diet, environment, and the use of antibiotics, shape a child’s gut microbiota, which can have a profound impact on childhood development and lifelong health. For example, recent studies suggest that infants whose microbiome development is disrupted via cesarean section delivery, early antibiotic use, limited breastfeeding, or other factors are at greater risk for asthma and allergies, respiratory infections, inflammatory bowel disease (IBD), type 1 diabetes, and obesity. Citation 14, Citation 15 The assembly of the infant microbiome is first determined by maternal – infant exchanges of microbiota. Citation 16 Therefore, optimizing the maternal microbiome during pregnancy is likely part of a comprehensive approach to protect and promote the fetus’s health and provide the newborn with a specific microbial inoculum at birth. Citation 14, Citation 17 After birth, maternal breast milk promotes the colonization and maturation of the infant’s gut microbiome. Human milk contains a high concentration of indigestible glycans, known as HMOs which can act as growth substrates for beneficial Bifidobacteria to support the early founder strains of the infant microbiome. Citation 18, Citation 19 In addition, HMOs extert several microbiome-independent mechanism such as serving as decoy receptors to effectively block the attachment of pathogenic bacteria and directly interacting with various receptors. Citation 20 The infant microbiome evolves and diversifies further throughout life in response to whether an infant is breastfed, or formula-fed and which type of formula is used. The weaning period (i.e. the introduction of solid food at around 4–12 months) represents another important window of opportunity to positively impact the development of the microbiome as the bacterial community needs to adapt to digest dietary fibers. Studies linking low gut microbial diversity and the lack of specific bacteria to atopic dermatitis emphasize the first 18 month as a critical window period. Citation 21 Complete gut colonization then occurs within approximately 3 years of life and plays an essential role in further digestion, immunity and neuroendocrine pathway development. Citation 22, Citation 23 In cases where antibiotic treatment is necessary, biotic supplements (i.e. pre, pro, syn or postbiotics) have been shown to lessen the deleterious impact of antibiotics on the infant gut microbiome. Citation 24, Citation 25
In healthy adults, the gut microbiome is fully developed and designed to maintain overall balance while promoting its own survival against environmental stressors, with microorganisms engaging in complex interactions. Recent high-resolution studies examining microbiome composition before, during, and after antibiotic use at the individual gene x strain level demonstrate the remarkable adaptability or ‘fitness’ of gut microbial ecosystems. Citation 26, Citation 27 A healthy and fully functional ecosystem primarily aims to preserve its balance, with ecological diversification playing a crucial role in shaping the genetic structure of resident populations to defend against competition and external disruptors and stressors. Citation 27, Citation 28 Thus, intestinal bacterial ecosystems seem to carry an inherent ecological resilience helping to protect both, themselves and as a consequence their host’s health. This resilience seems to be driven by two main factors: a more diverse microbiome appears generally better at preserving its own balance; Citation 29, Citation 30 and 2) a highly collaborative and interdependent nature of microbial communities seems to play a key role in ecological resilience. In a healthy state, different species work together in a balanced and mutually beneficial way through mechanisms like crossfeeding of various microbial nutrients beyond SCFAs and other forms of metabolic cooperation to stabilize bacterial communities under varying environmental conditions. Citation 31 Understanding these mechanisms across all life stages, from infancy to adulthood to old age, while accounting for the variability in adult microbiome profiles shaped by factors such as genetics, diet, lifestyle, and environmental exposures Citation 32–35 will likely enable the design of better-tolerated and more precise interventions. These interventions could holistically target the functionality of microbiome networks rather than focusing solely on individual species or strains and, thus, allow to tap into the endogenous biochemical pathways that act to maintain bacterial homeostasis.
The large diversity of the adult microbiome, however, presents a notable challenge. A previous comprehensive investigation involving over 1,000 healthy individuals from diverse ancestral backgrounds living in shared environments provided interesting insights. It showed that genetic ancestry has minimal influence on gut microbiome composition. Instead, notable similarities were found in the microbiomes of unrelated individuals sharing the same household with over 20% of the differences in microbiome composition between individuals attributed to factors such as habitual diet, medication use, and anthropometric measurements. Citation 36 This is supported by findings from controlled-feeding studies in humans Citation 35 Citation 37 For example, microbiome composition changed detectably within 24 h of initiating a high-fat/low-fiber vs. a low-fat/high-fiber diet Citation 37 despite entrotype stability.
Towards a holistic framework for multimodal LLM in 3D brain CT radiology report generation
Multimodal large language models (MLLMs) hold promise for a range of medical applications. Here, the authors use MLLMs for 3D brain CT radiology report generation, demonstrating that combining anatomy-aware model fine-tuning with robust evaluation metrics establishes a comprehensive and effective framework.
Atlas of brain’s mitochondria reveals high cognition areas supplied with more energy
Everything the brain does—from storing memories to interpreting sights to regulating emotions—requires energy, all produced by cellular organelles called mitochondria.
However, surprisingly little is known about the distribution and diversity of the brain’s tiny energy processors and how they influence brain health. For instance, how many mitochondria does the brain have? Are they uniformly distributed across the whole brain? Are all brain mitochondria the same? Do changes in the brain’s mitochondria affect mood, cognition, and the development of neurological and psychiatric conditions?
To begin answering these and other questions, Columbia University researchers have created MitoBrainMap, the first-ever atlas of the brain’s mitochondria.
The Hidden Heart Problem Quietly Shrinking Your Brain
Changes in the heart might mean more than just cardiovascular risk – they could also signal early shifts in brain health.
A large meta-analysis found that even subtle heart problems, like issues with how the heart pumps or relaxes, are linked to smaller brain volumes, particularly in areas related to memory.
Heart Issues May Signal Early Dementia Risk.
Scientists Just Built a Battery That Never Needs Charging
Imagine never charging your phone again or having a pacemaker that lasts a lifetime. Scientists are developing tiny nuclear batteries powered by radiocarbon, a safe and abundant by-product of nuclear plants.
Unlike lithium-ion batteries, which degrade over time and harm the environment, these new designs use beta radiation to trigger an electron avalanche and generate electricity. The team’s latest prototype vastly improved efficiency, and though challenges remain, the technology could one day make nuclear power as accessible as your pocket device.
The Problem with Current Batteries.
The Worm That No Computer Scientist Can Crack
By way of an answer, I’ll offer one of the physicist Richard Feynman’s most famous dictums: What I cannot create, I do not understand. For much of its history, biology has been a reductionist science, driven by the principle that the best way to understand the mind-boggling complexity of living things is to dissect them into their constituent parts—organs, cells, proteins, molecules. But life isn’t a clockwork; it’s a dynamic system, and unexpected things emerge from the interactions between all those little parts. To truly understand life, you can’t just break it down. You have to be able to put it back together, too.
The C. elegans nematode is a tiny worm, barely as long as a hair is wide, with less than a thousand cells in its body. Of those, only 302 are neurons—about as small as a brain can get. “I remember, when my first child was born, how proud I was when they reached the age they could count to 302,” said Netta Cohen, a computational neuroscientist who runs a worm lab at the University of Leeds. But there’s no shame in smallness, Cohen emphasized: C. elegans does a lot with a little. Unlike its more unpleasant cousins, it’s not a parasite, outsourcing its survival needs to bigger organisms. Instead, it’s what biologists call a “free-living” animal. “It can reproduce, it can eat, it can forage, it can escape,” Cohen said. “It’s born and it develops, and it ages and it dies—all in a millimeter.”
Worm people like Cohen are quick to tell you that no fewer than four Nobel Prizes have been awarded for work on C. elegans, which was the first animal to have both its genome sequenced and its neurons mapped. But there’s a difference between schematics and an operating manual. “We know the wiring; we don’t know the dynamics,” Cohen said. “You would think that’s an ideal problem for a physicist or a computer scientist or a mathematician to solve.”
Glucose’s double life: Study reveals its surprising role as a master regulator of tissue regeneration
The sugar glucose, which is the main source of energy in almost every living cell, has been revealed in a Stanford Medicine study to also be a master regulator of tissue differentiation—the process by which stem cells give rise to specialized cells that make up all the body’s tissues.
It does so not by being catabolized, or broken down, to release the energy sequestered in its chemical bonds, but instead by binding in its intact form to proteins that control which genes in the genome are made into proteins and when.
The discovery of glucose’s undercover double life was so surprising the researchers spent several years confirming their findings before publishing their results.
