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Reactive oxygen species (ROS) has great influence in many physiological or pathological processes in organisms. In the site of bone defects, the overproduced ROS significantly affects the dynamic balance process of bone regeneration. Many antioxidative organic and inorganic antioxidants showed good osteogenic ability, which has been widely used for bone repair. It is of great significance to summarize the antioxidative bone repair materials (ABRMs) to provide guidance for the future design and preparation of osteogenic materials with antioxidative function. Here, this review introduced the major research direction of ABRM at present in nanoscale, 2-dimensional coating, and 3-dimensional scaffolds. Moreover, the referring main active substances and antioxidative properties were classified, and the positive roles of antioxidative materials for bone repair have also been clearly summarized in signaling pathways, antioxidant enzymes, cellular responses and animal levels.

Objective: To reveal GSDME-executed pyroptosis in cancer cells induced by the Chinese traditional herbal medicine plant Lithospermum erythrorhizon (L. erythrorhizon, Zi Cao) and to investigate the potential mechanism. Methods: L. erythrorhizon was extracted by ultrasonication in 95% ethanol, and determined using high-performance liquid chromatography (HPLC). HeLa, A549, SW620, HEK-293 T, THP-1, K562, Raw264.7 and MDA-MB-231 cell lines were used to investigate the morphology and mechanism of pyroptosis induced by L. erythrorhizon. The lactate dehydrogenase (LDH) release, propidium iodide (PI)/Hoechst double-staining, and pyroptosis reconstitution experiments were performed to study L. erythrorhizon -induced cell pyroptosis. Results: Compared with the death inhibitor, PI/Hoechst and LDH release experiments, we found that L. erythrorhizon induced pyroptosis. Recombination and western blot experiments confired that L. erythrorhizon induced GSDME cleavage, which drives pyroptosis. This phenomenon is conserved in several cancer cell lines that might be triggered by caspase family proteases. The mechanism of L. erythrorhizon inducing pyroptosis is widely found in tumor cells. Conclusion: Our findings not only explain how L. erythrorhizon triggers cancer cell pyroptosis, but also provide mechanistic insights to guide its clinical application in the future.

ObjectiveThis study aims to compare the efficacy and safety of freehand atlantoaxial pedicle screws against custom 3D printed navigation template screws in the treatment of upper cervical fractures.MethodsIn our institution from 2010 to 2020, a retrospective cohort analysis of 23 patients with upper cervical fractures was done. These patients were separated into two groups: group A (N = 12), which received customized 3D printed navigation template-assisted screws with virtual reality techniques, and group B (N = 11), which received freehand screws assisted by intraoperative fluoroscopy. Every patient was monitored for more than 1 year. The two groups were contrasted in terms of screw implant accuracy, cervical spine Japanese Orthopaedic Association (JOA) score, American Spinal Injury Association (ASIA) score, visual analogue scale (VAS) score, surgical time, fluoroscopy times, and intraoperative blood loss.ResultsA total of 88 atlantoaxial pedicle screws in all, 46 in group A and 42 in group B, were implanted. In group A, the screw insertion accuracy rate was 95.7%, compared to 80.0% in group B (P

PURPOSE:Pedicle screw fixation in the upper cervical spine is a difficult and high-risk procedure. The screw is difficult to place rapidly and accurately, and can lead to serious injury of spinal cord or vertebral artery. The aim of this study was to design an individualized 3D printing navigation template for pedicle screw fixation in the upper cervical spine. METHODS:Using CT thin slices data, we employed computer software to design the navigation template for pedicle screw fixation in the upper cervical spine (atlas and axis). The upper cervical spine models and navigation templates were produced by 3D printer with equal proportion, two sets for each case. In one set (Test group), pedicle screws fixation were guided by the navigation template; in the second set (Control group), the screws were fixed under fluoroscopy. According to the degree of pedicle cortex perforation and whether the screw needed to be refitted, the fixation effects were divided into 3 types: Type I, screw is fully located within the vertebral pedicle; Type II, degree of pedicle cortex perforation is 1 mm or with the poor internal fixation stability and in need of renovation. Type I and Type II were acceptable placements; Type III placements were unacceptable. RESULTS:A total of 19 upper cervical spine and 19 navigation templates were printed, and 37 pedicle screws were fixed in each group. Type I screw-placements in the test group totaled 32; Type II totaled 3; and Type III totaled 2; with an acceptable rate of 94.60%. Type I screw placements in the control group totaled 23; Type II totaled 3; and Type III totaled 11, with an acceptable rate of 70.27%. The acceptability rate in test group was higher than the rate in control group. The operation time and fluoroscopic frequency for each screw were decreased, compared with control group. CONCLUSION:The individualized 3D printing navigation template for pedicle screw fixation is easy and safe, with a high success rate in the upper cervical spine surgery.