Abstract
In this work, a multi-stimuli responsive drug delivery system (MCHP) was designed for combinational chemotherapy and photothermal therapy (PTT). Mesoporous carbon nanoparticles (MCN) with a high loading efficiency were used as near-infrared (NIR)-responsive drug carriers. Human serum albumin (HSA) was attached to the pore openings of MCN via disulfide bonds to serve as a gatekeeper due to its biocompatibility and appropriate molecular size. To improve the dispersity and biocompatibility, the surface of the MCN was modified with polyethylene glycol (PEG). In vitro photothermal effect results showed that MCHP exhibited a power and concentration-dependent photothermal conversion capacity and a good photothermal stability. The doxorubicin (DOX) release from the MCHP/DOX system exhibited NIR/pH/reduction-responsive release properties. A cytotoxicity assay demonstrated that, under NIR irradiation, the MCHP/DOX exhibited chemo-photothermal synergistic effects with a combination index (CI) of 0.643. The biodistribution of DOX in vivo indicated that an NIR laser can prolong the retardation time of DOX in tumor sites. In vivo antitumor experiments showed that MCHP/DOX with NIR irradiation had the highest tumor inhibition rate against 4T1 tumors in mice. This work suggested that MCHP could be explored as a multi-responsive drug release platform for combinational photothermo-chemotherapy.
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