Biology Cell biology

Researchers at The University of Osaka have developed an improved technique called “tapping-mode scanning probe electrospray ionization” (t-SPESI), allowing the analysis of regions within individual cells with greater sensitivity and stability. Through device miniaturization and molecular modification of the probe surface, the team achieved higher sensitivity and long-term stability, successfully visualizing lipid distributions in mouse brain tissue at a pixel size of 5 µm.

Researchers at the University of Osaka developed the CLiB assay, a high-throughput platform to engineer protein-based lipid-binding probes. By screening a library of protein variants, they created a highly sensitive probe for the signaling lipid PI(3,5)P2. This tool allowed the team to visualize how cells remodel their membranes to engulf damaged materials, providing a framework for developing next-generation biosensors and unlocking new insights into the dynamic landscape of biological membranes.

Researchers from the University of Osaka have demonstrated that mitochondrial hyperfusion, when induced by low levels of DRP1 or cellular stress, activates an immune response through the RIG-I–MAVS pathway. Dependent on the involvement of the BAX protein, the release of mitochondrial RNA into the cytosol enhanced natural killer cell cytotoxicity and reduced tumor growth in a xenograft model. The findings provide new possibilities for cancer research and treatment.

Researchers find that neurons routinely sustain DNA breaks during cortex formation, but a rapid repair system corrects the damage before harm occurs.

Cells have surface receptors that couple to proteins and other molecules to initiate or inhibit certain behaviors. Researchers have found that one of these receptors helps set developing cells on the path to becoming neurons much earlier than previously thought.

Hiroshima University researchers say a newly proposed three-step “detour” pathway for making dolichol, a molecule cells need to properly process proteins, may be more universal than scientists realized. Experiments in yeast suggest eukaryotes may rely on overlapping biochemical pathways, including the evolutionarily conserved “detour” and evidence of a possible “backup route,” to produce a molecule essential to life.

Researchers at The University of Osaka used a focused laser beam to make in vitro models of cytoskeletal networks that exhibit dynamic cell-like motions. This technique provides spatiotemporal control of the network structure, unlike conventional methods based on self-organization and photochemical reactions. The models could be used to determine the structure–motion relationship of cytoskeletal networks, which has applications for understanding cell division, migration, and adhesion and the creation of protein-based robots and synthetic cells.

Researchers from The University of Osaka found that nanomicelle-mediated delivery of five mRNAs involved in angiogenesis, heart cell contraction, immune and hematopoietic stem cell recruitment, and immune response suppression promoted cardiac repair and increased overall survival in a mouse model of myocardial infarction–induced heart failure. These findings suggest that a multifactorial treatment approach effectively addresses the complex nature of heart failure and could aid new treatments in regenerative medicine for cardiovascular disease.

Carbohydrates affect weight gain and metabolic energy

Researchers identified the tegmentum in the midbrain as an ‘integration center’ of fish. The area receives visual information from the eyes that is combined with color information detected by the pineal organ—the ‘third eye.’ These inputs are integrated to control how fish orient themselves in the water.

We identified Mrep macrophages that repair muscle but trigger heterotopic ossification in FOP, advancing muscle and FOP therapy development.

Clinically available KRAS inhibitors mainly target G12C, which is rare in PDAC and often acquires resistance. Oncogenic KRAS inactivates RB1 via CDK4/6, while RB1 mutation is rare. Thus, CDK4/6 inhibition offers an indirect strategy to counter KRAS-driven malignancy without direct KRAS targeting.

Skeletal muscle stem cells in hibernating Syrian hamsters preserve their ability to function by suppressing their activation during the hibernation period, a research team led by Hiroshima University has shown. This insight may lead to a broader understanding of the maintenance of muscle tissue under prolonged low temperature conditions and may eventually lead to therapeutic applications.

Netrin-1 blocks HBV entry by inhibiting viral attachment and internalization, offering a new therapeutic avenue for chronic hepatitis B.

A research team at the Nano Life Science Institute (WPI-NanoLSI) and the Faculty of Medicine at Kanazawa University has developed a new class of engineered extracellular vesicles (EVs) capable of inducing antigen-specific regulatory T cells (Tregs), the immune cells that play a central role in suppressing excessive immune responses. The findings, now published in Drug Delivery, may pave the way for next-generation therapies for autoimmune and allergic diseases, where unwanted immune activation must be precisely controlled.

Brain atlas, From perfume to plastic, Stable solar power, Plant aging switch, Anti-cancer droplets, Greener gold, Extreme star factory and How research shapes sustainability policy. Read all in the latest Editor's Choice.

Elastic fiber component level in human hepatic stellate cells may predict liver damage

A team of researchers from Academia Sinica and National Taiwan University has identified the Drosophila Cul2 substrate adaptor DmZer1 as a key regulator of protein quality control, acting at the intersection of two major cellular “cleanup systems”: autophagy and the ubiquitin-proteasome system. Interestingly, lowering DmZer1 levels activates the Cnc/Nrf2 stress-response pathway, which in turn strengthens the cell’s ability to defend itself against oxidative stress.

Researchers at the Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, have developed a breakthrough method for quantitative imaging of ATP levels inside living cells. The study, published in Nature Communications, introduces qMaLioffG, a genetically encoded fluorescence lifetime indicator that allows scientists to observe how cells produce and consume energy in real time.

Researchers have created a special culture medium that allows dog stem cells to stably differentiate into functional heart muscle cells complete with contractions

Scientists at the Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, have discovered how a gene-regulating protein forms tiny liquid-like droplets inside the cell nucleus (the compartment that stores and manages DNA) to guard against cancer. Their study, published in Nature Communications, shows that these protein droplets act as control centers that keep tumor-suppressor genes switched on.

Scientists at The University of Osaka developed a new 3D culture scaffold by integrating the strong cell-adhesive domain of laminin-511 into a clinically used fibrin gel, creating a chimeric protein called Chimera-511. This laminin-functionalized fibrin gel supports efficient 3D expansion of human iPS cells while maintaining pluripotency. As a chemically defined, xeno-free material, it offers a promising alternative to Matrigel and a potential platform for clinically applicable organoids and regenerative therapies.

UOsaka and MIT scientists revealed that the motor proteins KIF18A and CENP-E work together to align chromosomes during mitosis. Cancer cells with reduced CENP-E levels are especially sensitive to KIF18A inhibition, and dual inhibition of both proteins leads to efficient cell death. The discovery offers new insights into chromosome mechanics and a potential strategy for targeted cancer therapy.

Researchers at the Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, report in ACS Applied Nano Materials a new method to precisely measure nuclear elasticity—the stiffness or softness of the cell nucleus—in living cells. By employing a technique called Nanoendoscopy-AFM (NE-AFM), which inserts a nanoneedle probe directly into cells, the team revealed how cancer cell nuclei stiffen or soften depending on chromatin structure and environmental conditions. The findings provide fundamental insights into how the physical properties of cancer cell nuclei change during disease progression, highlighting their potential as biomarkers for diagnosis and treatment evaluation.

Researchers from The University of Tokyo have found that single cells in collective chemotaxis act like agents in distributed reinforcement learning, utilizing the environment as an “external memory” and exhibiting highly intelligent behavior.

Ancient black holes, How good cholesterol is made, Self-healing plastic, Dengue’s genetic imprint, Korean mussel power & Space clean-up. Read all in the latest Editor's Choice.

A Kyoto University study has revealed, for the first time, how the body produces the “good cholesterol” that can prevent heart disease

An international research group led by The University of Osaka has developed scODIN, a novel computational tool to classify cell types from single-cell RNA sequencing (scRNA-seq) data. Existing methods struggle to balance speed and accuracy, often misclassifying rare or transitional cells. scODIN overcomes this limitation by combining a hierarchical classification system (Tier system) with k-nearest neighbor inference. This approach allows for the rapid and accurate classification of large datasets, processing 650,000 cells in just six minutes. The tool's improved accuracy stems from its ability to identify cells at varying levels of detail, recognize intermediate phenotypes through double labeling, and recover cells affected by dropout events. scODIN promises to accelerate biomedical discoveries by enabling more precise and efficient analysis of complex biological processes and disease mechanisms.

Reef-building corals use a previously unknown mechanism involving chloride to ‘see’ visible light

A customizable protein has been developed to help the body remove harmful cells, such as those involved in cancer or autoimmune diseases, offering a potential new direction for treatments.