No abstract

No abstract

No abstract

No abstract

We developed a red-fluorescent stain capable of achieving wash-free plasma membrane imaging in vitro and in vivo.

No abstract

Bacterial infections, especially chronic infections caused by bacterial biofilms, have become a worldwide threat to public health. Encouragingly, the synergistic actions of two or more antibacterial drugs have been proven to be effective in treating refractory bacterial infections. Herein, we fabricated a robust antibacterial nanohybrid, the colistin-loaded polydopamine nanospheres (PDA NSs) decorated uniformly with small silver nanodots (u-CPSs), and the u-CPSs could realize synergistic bactericidal performance for combating bacterial infections. PDA NSs, as an adhesive nanocarrier, could bind to the bacterial surfaces, where the drugs (colistin and silver ions) on the PDA surfaces could be released persistently via a near-infrared laser-triggered manner. Interestingly, compared with colistin-loaded PDA NSs decorated sparsely with large silver nanoparticles (s-CPSs), the u-CPSs exhibited stronger antibacterial and antibiofilm effects. We have also demonstrated that the u-CPSs could disrupt the cell walls/ membranes of Gram-negative Escherichia coli bacteria and induce the generation of toxic reactive oxygen species within the bacteria. Collectively, the present work exemplifies the exquisite design and synthesis of PDA-based nanohybrids for achieving synergistic antibacterial and antibiofilm activities, which may promote the development of more powerful nanoagents to fight against bacterial infections.

sorbicillinoids obtained by microbial fermentation using T. reesei. Sorbicillinoids could effectively generate singlet oxygen under UV light irradiation, and ultimately display photoinactivation activity on Gram-positive bacteria, but not Gram-negative ones. More importantly, UV light can generally only be used to inactivate bacteria on the surface due to its weak penetration. However, it can penetrate deep into the solution and inactivate bacteria in the presence of sorbicillinoids. Therefore, sorbicillinoids, a type of secondary metabolite from fungus, has a promising future as a new PS for APDT using nontoxic dose of UV light irradiation.