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Objectives: This study aimed to investigate the association between the use of linear and macrocyclic gadolinium-based contrast agents (GBCAs) and the subsequent development of Parkinson disease (PD).
Methods: In this retrospective cohort study, data were extracted from the Korean National Health Insurance Service database, comprising 1,038,439 individuals. From this population, 175,125 adults aged 40 to 60 years with no history of brain disease were identified. All patients including 3835 who were administered GBCA at least once were monitored until 2022 for the onset of PD. Propensity score (PS) matching was employed to compare the incidence of PD between those exposed to GBCAs (either linear or macrocyclic) and those not exposed (no-GBCA group).
Results: The final cohort consisted of 1175 subjects exposed to linear GBCAs, 2334 exposed to macrocyclic GBCAs, and 171,616 unexposed to any GBCA (no-GBCA group). After PS matching, PD incidence was significantly higher in the linear GBCA group compared with the no-GBCA group (0.9% vs 0.0%, P = 0.002) and was also significantly higher in the macrocyclic GBCA group than in the no-GBCA group (0.5% vs 0.04%, P = 0.003). No significant difference in PD incidence was observed between the linear and macrocyclic GBCA groups.
Conclusions: Exposure to GBCAs was linked to an increased risk of developing PD in this large population-based study. The risk of PD did not differ significantly between linear and macrocyclic GBCAs.
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http://dx.doi.org/10.1097/RLI.0000000000001155 | DOI Listing |
J Am Chem Soc
September 2025
State Key Laboratory of Petroleum Molecular & Process Engineering, Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China.
The discovery of new weak supramolecular interactions and supramolecular synthons is essential for directing self-assembly processes with enhanced precision, diversity, and functionality in complex molecular architectures. Here, we report the controlled self-assembly of diverse supramolecular architectures by a new directional bonding approach through the integration of radical-based dynamic covalent chemistry and supramolecular synthons. A novel macrocyclic synthon, , with a linear direction is constructed via radical-based dynamic covalent bonds from the phenothiazine building block substituted with two dicyanomethyl radicals.
View Article and Find Full Text PDFSpectrochim Acta A Mol Biomol Spectrosc
August 2025
School of Materials Science and Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China; Key Laboratory of Green Extraction & Efficient Utilization of Light Rare-Earth Resources (Inner Mongolia University of Science and Technology), Ministry of Education, Baotou 014010
Tetracycline residues in food pose risks to human health and contribute to antibiotic resistance, thereby requiring sensitive detection methods. This study developed a fluorescence sensor using a single-atom CoNC nanozyme, which was synthesized via pyrolysis of a cobalt phthalocyanine-encapsulated zeolitic imidazolate framework-8 precursor (CoPc@ZIF-8). This strategy directly converted the pre-organized CoN macrocyclic structure of CoPc into atomically dispersed CoNC sites, exhibiting exceptional oxidase-like activity with 20-fold higher specific activity than its cobalt nitrate-derived counterpart.
View Article and Find Full Text PDFJ Am Chem Soc
August 2025
Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford OX1 3TA, U.K.
What is the size limit for global aromaticity? How large can a macrocyclic π-system be and still exhibit an aromatic ring current around its circumference? We address this question by investigating a π-conjugated butadiyne-linked 18-porphyrin nanoring (diameter 8 nm). This nanoring was synthesized by two different strategies: classical template-directed synthesis, using a radial template with 18 pyridyl binding sites, and Vernier templating, using a small hexapyridyl template. Both strategies are effective when the porphyrins have octyloxy side chains, but classical templating is more effective than Vernier templating when the porphyrins have bulky trihexylsilyl substituents.
View Article and Find Full Text PDFPhys Chem Chem Phys
August 2025
Department of Chemistry, Center for Innovative Technology, Vanderbilt University, Nashville, TN 37235, USA.
Cyclodextrins (CDs) are macrocyclic oligosaccharides that have the ability to form host-guest inclusion complexes due to their amphiphilic properties, thereby allowing for an increase in the solubility and bioavailability of encapsulated small molecules, such as food constituents and active pharmaceutical ingredients (APIs). While solution-phase properties of CD inclusion complexes have been extensively studied, less is known about the prevailing coordination environment of metal-CD complexes in the absence of bulk solvent. Here, we investigate the gas-phase structural implications of alkali-metal complexation with the three naturally occurring cyclodextrins (αCD, βCD, and γCD) and a suite of linear maltodextrins using structurally-selective ion mobility-mass spectrometry (IM-MS) analysis.
View Article and Find Full Text PDFJ Org Chem
September 2025
Research Center for Marine Microbes, Laboratory of Tropical Marine Bio-Resources and Ecology, Guangdong Key Laboratory of Marine Materia Medica, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China.
Verlamelin A is a naturally occurring macrocyclic depsipeptide exhibiting high and broad-spectrum antifungal activity. The first unified total synthesis of verlamelin A and its (5)-verlamelin A (C5-epimer) is reported. This strategy involved homogeneous solution-phase synthesis of Fmoc-l-Val-O-(5/5)-tetradecanoic acid, solid-phase peptide synthesis of pentapeptide NH-d-allo-Thr-d-Ala-l-Pro-l-Gln-d-Tyr-OH, on-resin coupling of these two fragments to form a linear precursor , and off-resin cyclization followed by global deprotection to generate the final verlamelin A and (5)-verlamelin A in 6.
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