Therefore, we have successfully constructed the organic-inorganic thermo-responsive CS-L hydrogel system containing the dual-GFs and bioactive metal ions, which exhibited excellent angiogenic and osteogenic properties and results in the satisfied bone regeneration performance.
Photodynamic therapy (PDT) has become a promising cancer treatment approach with superior advantages. However, it remains a grand challenge to develop tumor microenvironment (TME)‐responsive photosensitizers (PSs) for tumor‐targeting precise PDT. Herein, the coupling Lactobacillus acidophilus (LA) probiotics with 2D CoCuMo layered‐double‐hydroxide (LDH) nanosheets (LA&LDH) is reported as a TME‐responsive platform for precise NIR‐II PDT. The CoCuMo‐LDH nanosheets loaded on LA can be transformed from crystalline into amorphous through etching by the LA‐metabolite‐enabled low pH and overexpressed glutathione. The TME‐induced in situ amorphization of CoCuMo‐LDH nanosheets can boost its photodynamic activity for singlet oxygen (1O2) generation under 1270 nm laser irradiation with relative 1O2 quantum yield of 1.06, which is the highest among previously reported NIR‐excited PSs. In vitro and in vivo assays prove that the LA&LDH can effectively achieve complete cell apoptosis and tumor eradication under 1270 nm laser irradiation. This study proves that the probiotics can be used as a tumor‐targeting platform for highly efficient precise NIR‐II PDT.
Although artificial bone repair scaffolds, such as titanium alloy, bioactive glass, and hydroxyapatite (HAp), have been widely used for treatment of large-size bone defects or serious bone destruction, they normally exhibit unsatisfied bone repair efficiency because of their weak osteogenic and angiogenesis performance as well as poor cell crawling and adhesion properties. Herein, the surface functionalization of MgAlEu-layered double hydroxide (MAE-LDH) nanosheets on porous HAp scaffolds is reported as a simple and effective strategy to prepare HAp/MAE-LDH scaffolds for enhanced bone regeneration. The surface functionalization of MAE-LDHs on the porous HAp scaffold can significantly improve its surface roughness, specific surface, and hydrophilicity, thus effectively boosting the cells adhesion and osteogenic differentiation. Importantly, the MAE-LDHs grown on HAp scaffolds enable the sustained release of Mg 2+ and Eu 3+ ions for efficient bone repair and vascular regeneration. In vitro experiments suggest that the HAp/MAE-LDH scaffold presents much enhanced osteogenesis and angiogenesis properties in comparison with the pristine HAp scaffold. In vivo assays further reveal that the new bone mass and mineral density of HAp/MAE-LDH scaffold increased by 3.18-and 2.21-fold, respectively, than that of pristine HAp scaffold. The transcriptome sequencing analysis reveals that the HAp/MAE-LDH scaffold can activate the Wnt/𝜷-catenin signaling pathway to promote the osteogenic and angiogenic abilities.
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