Sustained Drug Release from Dual-Responsive Hydrogels for Local Cancer Chemo-Photothermal Therapy.

As an exceptional carrier for localized drug delivery to tumors, hydrogels can achieve prolonged drug release through careful design and adjustments, effectively targeting cancer cells and minimizing side effects. This study investigates a novel dual-responsive hydrogel system designed for the delivery of nanomedicines, focusing on drug release and the local antitumor efficacy of SN-38-cholesterol nanoparticles (SN-38-chol NPs) and polydopamine NPs (PDA NPs)/poly(n-isopropylacrylamide) (pNIPAM) hydrogels. By combining the thermosensitive properties of pNIPAM with the near-infrared (NIR) responsiveness of PDA NPs, the hydrogel aims to enhance on-demand drug release. SN-38-chol NPs, known for their stability and small size, are incorporated into the hydrogel to improve drug release dynamics. The investigation reveals a drug release cycle of over three weeks, maintaining sensitivity to both temperature and NIR light for controlled drug release. In vivo studies demonstrate the high tumor growth inhibition performance of the system after photothermal treatment induced by 808 nm NIR light. These results suggest that the drug-carrying hydrogel system holds promise for diverse applications in chemical and physical therapies, including the treatment of malignant wounds, post-surgery wound healing, and direct tumor treatment. This study establishes the potential of SN-38-chol NPs and PDA NPs/pNIPAM hydrogels as effective platforms for chemo-phototherapy.