Treatment of large bone fractures remains a challenge for orthopedists. Bone regeneration is a complex process that includes skeletal cells such as osteoblasts, osteoclasts, and immune cells to regulate bone formation and resorption. Osteoimmunology, studying this complicated process, has recently been used to develop biomaterials for advanced bone regeneration. Ideally, a biomaterial shall enable a timely switch from early stage inflammatory (to recruit osteogenic progenitor cells) to later-stage anti-inflammatory (to promote differentiation and terminal osteogenic mineralization and model the microstructure of bone tissue) in immune cells, especially the M1-to-M2 phenotype switch in macrophage populations, for bone regeneration. Nanoparticle (NP)-based advanced drug delivery systems can enable the controlled release of therapeutic reagents and the delivery of therapeutics into specific cell types, thereby benefiting bone regeneration through osteoimmunomodulation. In this review, we briefly describe the significance of osteoimmunology in bone regeneration, the advancement of NP-based approaches for bone regeneration, and the application of NPs in macrophage-targeting drug delivery for advanced osteoimmunomodulation.
Background: Presurgical nasoalveolar molding (NAM) is the most common preoperative treatment for cleft lip and palate. However, NAM may have some limitations such as requiring high technical sensitivity and frequent visits. To simplify the device, some scholars have changed the traditional NAM into a split-NAM consisting of a alveolar molding plate and a nasal hook. This study compared the shaping effect of split NAM and traditional NAM on nasolabial soft tissue using three-dimensional (3D) measurement. Methods: A total of 39 patients with unilateral cleft lip and palate (UCLP) were enrolled and divided into 2 groups. 13 patients were treated with split-NAM while the other 26 patients were treated with traditional NAM. 3D images of all patients’ craniofacial soft tissue before and after NAM treatment were recorded and measured by three-dimensional software. Statistical analysis of measurements in both groups was performed using SPSS software. Results: After treatment, nasal soft tissue symmetry in the split-NAM group was better improved than that in the NAM group in vertical and anterior-posterior direction, but was worse improved in transverse direction. There was no significant difference in labial soft tissue symmetry between two groups. Conclusions: The split NAM can better elevate the alar and nostrils of the cleft side, and have a better forward effect on alar outer edge, nasal base, and nostrils. However, the traditional NAM can better reduce the width of nasal base.
Macrophages are the most important innate immune cells that participate in various inflammation-related diseases. Therefore, macrophage-related pathological processes are essential targets in the diagnosis and treatment of diseases. Since nanoparticles (NPs) can be preferentially taken up by macrophages, NPs have attracted most attention for specific macrophage-targeting. In this review, the interactions between NPs and the immune system are introduced to help understand the pharmacokinetics and biodistribution of NPs in immune cells. The current design and strategy of NPs modification for specific macrophage-targeting are investigated and summarized.
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