A pH-responsive amphiphilic chitosan-pyranine core-shell nanoparticle for controlled drug delivery, imaging and intracellular pH measurement

作者：Chou Hao Syun; Hsiao Meng Hsuan; Hung Wei Yang; Yen Tin Yo; Lin Hui Yi; Liu Dean Mo^*

来源：Journal of Materials Chemistry B, 2014, 2(38): 6580-6589.

DOI：10.1039/c4tb01080a

A pH-responsive multifunctional core-shell nanoparticle, named CHC-PY nanoparticle, was successfully synthesized through electrostatic interaction of a thin shell of fluorescent pyranine dye (PY) with amphiphilic carboxymethylhexanoyl chitosan (CHC) nanoparticles. Upon encapsulating an anticancer drug, camptothecin (CPT), the CHC-PY nanoparticles exhibited an excellent drug loading efficiency (%26gt;95%). The resulting CPT-loaded CHC-PY nanoparticles also exhibited efficient cell internalization and good pH-responsive behavior. After being internalized (via efficient endocytosis pathway), the presence of fluorescent PY shell showed a pH-dependent emission characteristic which allowed the internalized CHC-PY nanoparticles acting as an indicator to distinguish the acidic microenvironment of cancerous cells, compared with normal cells. The pH-sensitive PY shell also acted as a modulator to control the CPT release wherein a higher release rate was detected at lower pH value, which is essentially a potential therapeutic niche for anticancer purposes. This new type of CHC-PY core-shell nanoparticle provides multiple functionality, where a synergistic performance of nanotherapeutics, imaging and even diagnosis at a cellular resolution can be achieved simultaneously.

• 出版日期2014
• 单位中国医科大学