Putative nudix hydrolase (NUDX) genes, which encode amino acid sequences showing homology with those of Arabidopsis NUDXs and conserve nudix motif, were identified from barley. The 14 deduced barley NUDXs (HvNUDX1-14) were classified into established subfamilies, except for 8-oxo-deoxyguanosine 5′-triphosphate (8-oxo-dGTP) pyrophosphohydrolase and mRNA decapping enzyme subfamilies, and three substrate-unknown subfamilies. Drought and UV-C stresses, respectively, up-regulated 7 and 4 HvNUDX genes, but some homologs of Arabidopsis NUDXs showed different responses to abiotic stress. HvNUDX12 gene, belonging to diadenosine tetraphosphates (Ap₄A) pyrophosphohydrolase subfamily gene and up-regulated by UV-C, was expressed in Escherichia coli cells. The recombinant protein showed 8-oxo-dGTP, Ap₄A, and guanosine-3′,5′-tetraphosphate (ppGpp) pyrophosphohydrolase activities, and the suppression of the lacZ amber mutation in a mutT-deficient E. coli cells caused by the incorporation of 8-oxo-GTP into mRNA was prevented to a significant degree. These results suggest that barley NUDXs have unique constitution and response of NUDX to abiotic stress. The 14 putative NUDX genes were identified from barley and the deduced NUDXs were classified into 7 established and 3 substrate-unknown subfamilies.

Although results of recent studies suggest that fermented foods strongly affect the gut microbiota composition and that they relieve inflammatory bowel disease symptoms, some reports have described that fermented foods increase some inflammation markers based on differences in fermented food materials. This study evaluated the effects of fermented plant extract (FPE) on dextran sulfate sodium (DSS)-induced colitis in mice and the effects on fecal microbiota composition in humans. Mice fed 5% FPE with 3% DSS (FPE group) showed no body weight loss, atrophy of colonic length, or bloody stool, similar to mice fed a basal diet (negative group), whereas mice fed 3% DSS (positive group) exhibited those effects. Concentrations of inflammation markers IL-6 and TNF-α were not significantly different between FPE and negative groups; however, those concentrations became higher in the positive group. 16S ribosomal RNA gene sequencing was used to characterize fecal microbiota in healthy women before and after 3-month FPE supplementation. The FPE supplementation induced increases in Firmicutes phyla and in Clostridiales order, which play a central role in inflammation suppression. These results suggest that FPE enhances Clostridiales growth in the gut and that it has an anti-inflammatory effect.

A purple-pigmented (purple) rice seeds containing an anthocyanin, a major class of flavonoids, and their isogenic non-pigmented (white) seeds were exposed outside of the international space station (ISS) to evaluate the impact of anthocyanin on seed viability in space. The rice seeds were placed in sample plates at the exposed facility of ISS for 440 days, with the bottom layer seeds exposed to space radiation and the top layer seeds exposed to both solar light and space radiation. Though the seed weight of both purple and white seeds decreased after exposure to outer space, growth percentages after germination of purple and white seeds in the top layer were 55 and 15 %, respectively, compared to those in the bottom layer 100 and 70 %, respectively. RNA analysis revealed that 1,590 and 1,546 seed-stored mRNAs (long-lived mRNAs) were degraded in the white seeds of the top and the bottom layers, respectively, whereas those of the purple seeds in the top and bottom layers were 548 and 303, respectively. These results suggest that anthocyanin protected seeds and safeguarded long-lived mRNAs from solar light and space radiation to increase the seed viability.

Introduction: Microplastics (MPs) are commonly found in food and water, leading to their ingestion through daily diets. MP particles smaller than 150 μm can cross the intestinal epithelium, posing potential health risks. Rapid excretion of MPs from the intestines may help reduce these risks. Methods: Fermented plant extract (FPE) is a rich source of nutrients and active substances, which promote gut health and relieve constipation. To evaluate the MP-excluding potential of FPE, it was suspended in artificial gastric or intestinal juices, followed by the addition of 100 mg of MP particles, which remained floating in the solution. After shaking for 1 hour at 37°C, the floating MP particles were collected and weighed. The excluded weight was calculated by subtracting the weight of the floating MP particles from the initial 100 mg. Results: The weights of non-floating MP particles (diameter: 106–125 μm) in artificial gastric juice mixed with 10, 5, 2.5, and 1 g of FPE were 73 ± 0.3, 74 ± 1.7, 63 ± 1.5, and 31 ± 1.5 mg, respectively. In artificial intestinal juice, the values were 45 ± 2.3, 55 ± 1.2, 43 ± 1.2, and 16 ± 2.6 mg, respectively. The weights of non-floating particles with a diameter of 250-300 μm were significantly lower than those with a diameter of 106-125 μm. Discussion: FPE exhibited greater effectiveness in acidic gastric juice, suggesting that certain MP-binding components in FPE become ionized under acidic conditions, thereby enhancing ionic interactions with microplastics. Smaller MP particles were bound more effectively than larger ones, likely due to their relatively greater surface area. Conclusion: FPE facilitates MP exclusion from the gastrointestinal tract, reducing the risk of intestinal absorption.