Kyoto, Japan -- Maintaining healthy blood glucose levels involves striking a balance between the glucose produced by the liver during fasting, and the insulin released from pancreatic beta cells after meals. In type 2 diabetes, glucose production goes into overdrive while insulin secretion dwindles to insufficiency, a multiple-organ dysfunction that contributes to hyperglycemia, or high blood glucose levels.

Intracellular calcium signaling is essential to both processes and could represent a crucial link between them, yet a common molecular regulator has yet to be found. While the protein carbonic anhydrase VIII -- CA8 -- is known to bind IP3R1, a calcium-release channel in the endoplasmic reticulum, as well as restrain calcium signaling in other tissues, this protein lacks the usual enzyme activity. However, a team of researchers at Kyoto University found the protein to be enriched in pancreatic islets and hepatocytes, and wondered whether CA8 may play a role in controlling metabolic functions in the liver and pancreas.

The team combined metabolic testing of Car8^wdl mice -- lacking functional CA8 -- with experiments on the mice's isolated pancreatic islets and liver hepatocytes. They measured insulin secretion, glucose production, calcium responses, and gene expression, and then used pharmacological and genetic tests to assess whether the effects depended on IP3R1.

A high-entropy lanthanoid oxide catalyst overcomes the challenges associated with oxidative coupling of methane (OCM), revealed Institute of Science Tokyo scientists. Using lanthanoid acetates and aspartic acid, they developed a high-entropy lanthanoid oxide, (LaSmEuGdDy)₀.₄O₃, via a sol–gel method. The high entropy catalyst was characterized by enhanced durability. The catalyst lowered OCM onset temperature and improved C2 hydrocarbon yield. Going beyond conventional catalysts, this finding may open a new avenue for selective heterogeneous catalysis.

A novel nanovesicle-based platform developed at Institute of Science Tokyo can measure hydrostatic pressure by converting pressure-induced molecular changes into fluorescence signals. The researchers developed pyrene-modified polyionic complex vesicles and demonstrated that variations in the vesicles’ membrane stiffness regulate their pressure sensitivity. Softer vesicles showed strong sensitivity in the 0.1–50 MPa range, while stiffer vesicles showed pressure-dependent changes in fluorescence lifetime. These findings enable the investigation of hydrostatic pressure-dependent phenomena in diverse inaccessible environments.

Pitting corrosion can threaten the durability of aluminum components. Researchers from Shibaura Institute of Technology, Japan, used interpretable machine learning to reveal a critical shift in how surface morphology affects steam-coated aluminum. The model identified a thickness-dependent change in this interaction near 2,200 nm, or 2.2 µm, within a specific roughness range. The findings suggest directions for coating design and further experimental validation.

House dust contains chemical and biological components that may influence the indoor environment during pregnancy. Researchers from Japan analyzed 81,125 mother–child pairs and found that more frequent house dust–related cleaning behaviors during pregnancy were associated with lower odds of screening positive for developmental concerns from 18 months to 3 years. The findings highlight household environmental management as a potential area for further study while underscoring the need for objective exposure measurements

Wearable sensors that measure sodium and potassium in sweat could help monitor people working or exercising in hot environments. However, printed reference electrodes often need a long conditioning time before giving stable readings. Against this backdrop, researchers developed an wristwatch-type sensor that pairs a quick-settling printed reference electrode with ion-selective electrodes, a fabric-based sample transport layer, and wireless electronics. Their design demonstrates the feasibility of a wearable sweat-monitoring system with potential for low-cost mass production.

A new study shows that fish living close to human activity can be well fed while simultaneously displaying molecular signs of chronic physiological stress, suggesting a possible “junk food effect.” The research also opens the possibility of using organisms themselves as recorders of environmental conditions, with genome-wide gene activity revealing ecological impacts invisible to conventional environmental monitoring.

Feeling confident that a romantic relationship will remain stable may be important for how people experience their relationships, finds a study by researchers at Waseda University and Nagoya University. Comparing gay and heterosexual men, the researchers found higher levels of attachment anxiety and avoidance and lower perceived relationship stability among gay men. The study suggests that differences in attachment may be linked not only to experiences within relationships, but also to the surrounding social environment.

Researchers in Japan discovered that blocking the enzyme BCAT1 can reduce fibrosis, or harmful stiffening, in mouse hearts after a heart attack. This intervention preserved heart function even when administered after tissue damage had begun. The findings suggest BCAT1 as a promising, targeted therapy for heart failure in humans, with the potential for fewer side effects.