Folic Acid [HRP]

In this paper, we have designed long afterglow luminescent MgGeO3:Mn2+,Yb3+,Li+(MGO) nanoparticles in the first (NIR-I) and second (NIR-II) biological windows. Yb(3+)ions served not only as the trap center to enhance the NIR-I long afterglow emission of Mn(2+)at 680 nm, but also as an emitting center to produce a NIR-II long afterglow emission at similar to 1000 nm. Furthermore, we have found the addition of Li(+)can greatly increase the NIR-II afterglow emission of Yb(3+)and the optimal amount of Mn2+, Yb(3+)and Li(+)was found to be 0.1, 0.5 and 0.5 mol%, respectively. The MGO nanoparticles synthesized using sol-gel methods showed a uniform morphology with a diameter of 50-100 nm, which were suitable for applications in bioimaging. More importantly, we have found MGO nanoparticles can be effectively excited to produce long persistent NIR-I and II luminescence using soft X-rays, suggesting that low dosage soft X-rays can also serve as a more powerful and deep tissue excitation source to recharge MGO nanoparticles. Furthermore, the MGO nanoparticles can also be re-excited to produce photo-stimulated emission under the irradiation of 650 and 808 nm NIR lasers. Thein vivoimaging results have shown that MGO nanoparticles modified with folic acid (FA) can effectively realize super long-term targetedin vivoimaging of inflammation with a high sensitivityviarecharging using soft X-rays and NIR lasers, which can provide not only an accurate diagnosis of inflammation, but also long-term monitoring of possible changes in the focus of inflammation in real time.

Escherichia coliis an important model organism in microbiology and a prominent member of the human microbiota(1). Environmental isolates readily colonize the gastrointestinal tract of humans and other animals, and they can serve diverse probiotic, commensal and pathogenic roles in the host(2-4). Although certain strains have been associated with the severity of inflammatory bowel disease (IBD)(2,5), the diverse immunomodulatory phenotypes remain largely unknown at the molecular level. Here, we decode a previously unknownE. colimetabolic pathway that produces a family of hybrid pterin-phenylpyruvate conjugates, which we named the colipterins. The metabolites are upregulated by subinhibitory levels of the antifolate sulfamethoxazole, which is used to treat infections including in patients with IBD6,7. The genesfolX/MandaspC/tyrBinvolved in monapterin biosynthesis(8-10)and aromatic amino acid transamination,(11)respectively, were required to initiate the colipterin pathway. We show that the colipterins are antioxidants, harbour diverse immunological activities in primary human tissues, activate anti-inflammatory interleukin-10 and improve colitis symptoms in a colitis mouse model. Our study defines an antifolate stress response inE. coliand links its associated metabolites to a major immunological marker of IBD. Subinhibitory levels of sulfamethoxazole, an antibiotic used to treatEscherichia coliinfections, trigger a previously undescribed metabolic pathway inE. colithat comprises a family of hybrid pterin-phenylpyruvate conjugates called colipterins. These metabolites are antioxidants, have immunomodulatory properties and improve colitis in a murine model.