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Bifunctional carbon dots for cell imaging and inhibition of human insulin fibrillation in the whole aggregation process.
Int J Biol Macromol ; 147: 453-462, 2020 Jan 07.
Artigo em Inglês | MEDLINE | ID: mdl-31923519
ABSTRACT
Due to the favorable stability, water solubility and good biocompatibility, carbon dots have attracted much attention. Herein, a novel nitrogen-doping bifunctional carbon dots (N-BCDs) with ultra-highly quantum yield (QYabs = 70.4%) is prepared through microwave-assisted method. 50 µg/mL of N-BCDs emit intense fluorescence in HeLa and GES-1 cells with negligible cytotoxicity. In addition, effective inhibition of N-BCDs to human insulin (HI) fibrillation is observed even at 10:1 (mass ratio of HI: N-BCDs) by ThT fluorescence, CD assay and TEM. N-BCDs prevent HI from fibrillation with prolonged lag time and reduced fluorescent intensity at equilibrium, regardless of the addition time of N-BCDs (HI: N-BCDs = 1:1, mass ratio), which has been rarely reported before. Furthermore, the morphology of final HI fibrils is shorter and thinner in the presence of N-BCDs. Mechanism studies reveal that the enhanced hydrogen bond between HI monomers and N-BCDs inhibits nucleation during the lag stage (Ka: 1.54 × 104 L·mol-1, 298 K), while the accumulation of N-BCDs blocks the growth of profibrils in the elongation stage. To the best of our knowledge, it's the first time to observe the accumulation of N-BCDs around HI profibrils with TEM. Our study provides a new strategy for developing efficient nanoparticle inhibitors for protein fibrillation.

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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: Int J Biol Macromol Ano de publicação: 2020 Tipo de documento: Artigo