Bone fractures usually heal efficiently, but in some patients this process fails, causing nonunion. A recent study identifies Apex1 as a redox-regulated driver of fracture repair. Using genetic mouse models, researchers show Apex1 controls early Bmp2 activation and later chondrocyte maturation, coordinating callus formation, vascularization, and cartilage-to-bone transition. These findings highlight oxidative stress regulation as a promising therapeutic strategy to improve bone healing and reduce the risk of fracture nonunion.

New study shows how bacteria adapted a virus-derived injection system to recognize and attach to many different types of cells. By systematically identifying thousands of rapidly evolving receptor-binding proteins, the researchers explain how these systems can be retargeted again and again in nature by swapping the part that binds to cells. The work not only solves a long-standing mystery about how these bacterial machines function, but also demonstrates that they can be engineered to deliver proteins into specific human cells, pointing to future biomedical and biotechnological applications.

Using a pioneering method they developed to directly measure viscosity in a group of cells, University of Wisconsin–Madison engineers have made a surprising discovery that upends understanding of how cells move.

Researchers are continually looking for new ways to hack the cellular machinery of microbes like yeast and bacteria to make products that are useful for humans and society. In a new proof-of-concept study, a team from the Carl R. Woese Institute for Genomic Biology showed they can expand the biosynthetic capabilities of these microbes by using light to help access new types of chemical transformations. The paper, published in Nature Catalysis, demonstrates how the bacteria Escherichia coli can be engineered to produce these new molecules in vivo, using light-driven enzymatic reactions. This framework sets the foundation for future development in the emerging field of photobiocatalysis.

Chordoma is a rare, treatment-resistant tumor with limited therapeutic options and a high rate of recurrence. In a recent study, researchers investigated the role of eosinophils in chordoma progression and demonstrated that eosinophils play a critical role in suppressing tumor growth. Lower eosinophil levels were associated with increased tumor proliferation and recurrence. These findings suggest eosinophils may serve as a potential immunotherapeutic target to improve diagnosis, treatment strategies, and clinical outcomes in patients with chordoma.

Researchers at Kyushu University discovered a new ladybird beetle species, Parastethorus pinicola, on a pine tree at their Hakozaki Satellite. The finding was part of a major taxonomic review of the tribe Stethorini in Japan involving 1,700 specimens. The study describes two new species and corrects long-standing classification errors, proving that unknown biodiversity can still be found in the middle of a city—even on a university campus.