细胞膜锚定纳米光敏剂用于光控钙超载和肿瘤特异性协同治疗

Poor selectivity and unintended toxicity to normal organs are major challenges in calcium ion (Ca 2+ ) overload tumor therapy. To address this issue, a cell membrane-anchoring nano-photosensitizer (CMA-nPS) is constructed for inducing tumor-specific Ca 2+ overload through multistage endogenous Ca 2+ homeostasis disruption under light guidance, i. e. , the extracellular Ca 2+ influx caused by cell membrane damage, followed by the intracellular Ca 2+ imbalance caused by mitochondrial dysfunction.

CMA-nPS is decorated by two types of functionalized cell membranes, the azide-modified macrophage cell membrane is used to conjugate the dibenzocyclooctyne-decorated photosensitizer, and the vesicular stomatitis virus glycoprotein (VSV-G)-modified NIH3T3 cell membrane is used to guide the anchoring of photosensitizer to the lung cancer cell membrane.

The in vitro study shows that CMA-nPS mainly anchors on the cell membrane, and further causes membrane damage, mitochondrial dysfunction, as well as intracellular Ca 2+ overload upon light irradiation. Synergistically enhanced antitumor efficiency is observed in vitro and in vivo.

This study provides a new synergistic strategy for Ca 2+ -overload-based cancer therapy, as well as a strategy for anchoring photosensitizer on the cell membrane, offering broad application prospects for the treatment of lung cancer.