Bone fractures are often companied with poor bone healing and high rates of infection. Early recruitment of mesenchymal stem cells (MSCs) is critical for initiating efficient bone repair, and mild thermal stimulation can accelerate the recovery of chronic diseases. Here, a bioinspired, staged photothermal effect-reinforced multifunctional scaffold was fabricated for bone repair. Uniaxially aligned electrospun polycaprolactone nanofibers were doped with black phosphorus nanosheets (BP NSs) to endow the scaffold with excellent near-infrared (NIR) responsive capability. Apt19S was then decorated on the surface of the scaffold to selectively recruit MSCs toward the injured site. Afterward, microparticles of phase change materials loaded with antibacterial drugs were also deposited on the surface of the scaffold, which could undergo a solid-to-liquid phase transition above 39 degrees C, triggering the release of payload to eliminate bacteria and prevent infection. Under NIR irradiation, photothermal-mediated up-regulation of heat shock proteins and accelerated biodegradation of BP NSs could promote the osteogenic differentiation of MSCs and biomineralization. Overall, this strategy shows the ability of bacteria elimination, MSCs recruitment, and bone regeneration promotion with the assistance of photothermal effect in vitro and in vivo, which emphasizes the design of a bioinspired scaffold and its potential for a mild photothermal effect in bone tissue engineering.
基金:
Harvard Medical School/Brigham and Women's Hospital Department of Anesthesiology Basic Scientist Grant [2420 BPA075]; Gillian Reny Stepping Strong Center for Trauma Innovation Breakthrough Innovator Award [113548]; Nanotechnology Foundation [2022A002721]; Farokhzad Family Distinguished Chair Foundation [018129]; National Natural Science Foundation of China [52073014, 52221006, 82002049]; Special Funds for Fundamental Scientific Research Expenses of Central Universities [buctrc202020]; Key Program of Beijing Natural Science Foundation [Z200025]; opening Foundation of State Key Laboratory of Organic-Inorganic Composites [oic-202201004]; Capital's Funds for Health Improvement and Research [2022-4-20511]; Beijing Tongren hospital seed funds [2021-YJJ-ZZL-008]
第一作者机构:[1]Beijing Univ Chem Technol, State Key Lab Organ Inorgan Composites, Beijing Lab Biomed Mat, Beijing 100029, Peoples R China[2]Harvard Med Sch, Brigham & Womens Hosp, Ctr Nanomed, Boston, MA 02115 USA[3]Brigham & Womens Hosp, Harvard Med Sch, Dept Anesthesiol, Boston, MA 02115 USA
共同第一作者:
通讯作者:
通讯机构:[2]Harvard Med Sch, Brigham & Womens Hosp, Ctr Nanomed, Boston, MA 02115 USA[3]Brigham & Womens Hosp, Harvard Med Sch, Dept Anesthesiol, Boston, MA 02115 USA