Researchers from Japan have uncovered direct evidence showing how ketamine exerts its rapid antidepressant effects in patients with treatment-resistant depression, using a novel brain imaging technique to visualize molecular changes in the living human brain. Using positron emission tomography imaging with the newly developed tracer [¹¹C]K-2, the study shows that ketamine’s antidepressant effects are mediated by region-specific changes in AMPA receptor density that correlate with symptom improvement, bridging findings from animal models to human patients.

Researchers at the Cancer Research Institute and the Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, have uncovered a critical mechanism that enables gastric cancer to spread to distant organs. Their study shows that cancer cells stimulate Wnt signaling in surrounding stromal fibroblasts to produce hyaluronan, creating a supportive microenvironment that promotes metastasis.

These findings provide new insight into how metastatic tumors establish themselves and suggest promising strategies to prevent gastric cancer progression.

Modern human and veterinary medical interventions to combat infectious diseases depend on the continued efficacy of antimicrobial drugs. Antimicrobial resistance (AMR) is the quintessential One Health challenge threatening human and animal health and welfare and has environmental effects on ecological communities in soil and water. Policy guidance on AMR needs to anticipate the likely outcomes of different interventions and courses of action. For that, transdisciplinary collaboration to understand the development, spread, and impacts of AMR is crucial. We report the outcomes of an international workshop that explored the challenges and opportunities for modelling AMR across One Health settings. They include the disparity of data quality and availability, the broader knowledge gaps in key areas such as the relationship between antimicrobial use (AMU) and AMR, and the difficulty of defining AMR as a single outcome given its heterogeneity. Differences between microbial species, resistance genes, environments (i.e., terrestrial vs. aquatic) and practical settings (e.g., human clinical vs. veterinary, or individual vs. population) complicate the generalizability of model applications. However, synoptic AMR metrics are necessary to cut through the complexity for policymaking. We discuss the status of AMR modelling with respect to a hierarchy of modelling evidence for decision-making. Finally, we consider learnings from modelling other wicked environmental challenges to develop a pragmatic approach to inform policy.