Local icariin application enhanced periodontal tissue regeneration and relieved local inflammation in a minipig model of periodontitis

Periodontitis is an inflammatory autoimmune disease. Treatment should alleviate inflammation, regulate the immune reaction and promote periodontal tissue regeneration. Icariin is the main active ingredient of Epimedii Folium, and it is a promising compound for the enhancement of mesenchymal stem cell function, promotion of bone formation, inhibition of bone resorption, alleviation of inflammation and regulation of immunity. The study investigated the effect of icariin on periodontal tissue regeneration in a minipig model of periodontitis. The minipig model of periodontitis was established. Icariin was injected locally. The periodontal clinical assessment index, a computed tomography(CT) scan, histopathology and enzyme-linked immune sorbent assay(ELISA)were used to evaluate the effects of icariin. Quantitative analysis results 12 weeks post-injection demonstrated that probing depth,gingival recession, attachment loss and alveolar bone regeneration values were(3.72 ± 1.18) mm vs.(6.56 ± 1.47) mm,(1.67 ± 0.59)mm vs.(2.38 ± 0.61) mm,(5.56 ± 1.29) mm vs.(8.61 ± 1.72) mm, and(25.65 ± 5.13) mm3 vs.(9.48 ± 1.78) mm3 in the icariin group and0.9% NaCl group, respectively. The clinical assessment, CT scan, and histopathology results demonstrated significant enhancement of periodontal tissue regeneration in the icariin group compared to the 0.9% NaCl group. The ELISA results suggested that the concentration of interleukin-1 beta(IL-1β) in the icariin group was downregulated compared to the 0.9% NaCl group, which indicates that local injection of icariin relieved local inflammation in a minipig model of periodontitis. Local injection of icariin promoted periodontal tissue regeneration and exerted anti-inflammatory and immunomodulatory function. These results support the application of icariin for the clinical treatment of periodontitis.

Functionalized Asymmetric Poly (Lactic Acid)/Gelatin Composite Membrane for Guided Periodontal Tissue Regeneration

Aim: Periodontitis is caused by chronic gingival inflammation and affects a large population in the world. Although guided tissue regeneration (GTR) therapy has been proven to be an effective treatment, the deficiency in the symmetrical design of all the GTR membrane in the market leaves large space for improvement. Therefore, we designed a novel asymmetrical bi-layer PLA/gelatin composite membrane for treating periodontitis. Methods: The PLA side was fabricated by electrospinning with metronidazole (MNA) pre-mixed with the PLA solution. The gelatin side containing bioglass (BG) 45S5 was fabricated with freeze-drying process and cross-linked with PLA membrane. The bio-compatibility of the membrane was evaluated in vitro using NIH3T3 cells. The releasing of MNA was measured by spectrophotometer. The bioactivity of the membrane was evaluated by hydroxyapatite (HA) deposit and determined by FTIR spectrometer. The ionic concentration of Ca2+ and was measured by ICPOES. The expression of the osteogenesis makers was determined by qRT-PCR. Results: The bi-layer PLA/gelatin composite membrane is biocompatible and bioactive. The releasing of MNA can rapidly reach the anti-bacterial effective concentration. Interestingly, the incorporation of MNA modulated the degradation rate of PLA scaffold to meet the requirement of tissue regeneration. Meanwhile, the embedding of the BG powder in the gelatin porous layer provided a favorable Ca2+ and ion environment for the regeneration of the alveolar bone tissue. Conclusions: Taken together, this bi-layer GTR membrane is closer to the physiological structure of the periodontal. The addition of MNA and BG makes it more powerful in treating periodontitis. Moreover, this research provides an example of biomimetic design in fabricating biomaterial for clinical applications.

Research progress of strontium in promoting periodontal tissue regeneration

Periodontal disease is a chronic infectious disease of the oral cavity.Its main clinical features are periodontal pocket formation and alveolar bone resorption.Scholars'research hotspot is to achieve periodontal tissue regeneration in patients.Studies have found that strontium has certain potential in promoting periodontal tissue regeneration.In recent years,scholars have been conducting research on strontium and periodontal tissue regeneration,with a view to opening a new path for periodontal disease treatment.This article reviews the research status of strontium and periodontal tissue regeneration.The review results show that strontium can induce the proliferation and differentiation of PDLSCs and promote the regeneration of lost bone tissue;it can inhibit osteoclast activity and induce osteoclast apoptosis through a variety of signaling pathways,thereby inhibiting bone resorption;Promote bone formation;Strontium also has the function of promoting early angiogenesis and suppressing immune inflammatory response.Because the current research on strontium and periodontal tissue regeneration is only focused on in vivo and in vitro experiments,there is no relevant clinical trial to apply strontium to periodontal tissue regeneration.Therefore,if strontium is used to promote periodontal tissue regeneration to achieve the treatment of periodontal disease,further research is needed.

Possible mechanism of 15D-PGJ2 in promoting periodontal tissue regeneration in patients with mandibular defects

Objective:To explore the main physiological mechanism of 15d-PGJ2 promoting periodontal tissue regeneration in patients with jaw defects caused by periodontal disease.Methods:From February 2016 to July 2019,a controlled study was conducted on 73 healthy residents(healthy group)and 73 patients(case group)with periodontal disease combined with jaw defects in Changsha medical university.T test was used to compare the growth factors of gingival crevicular fluid between the two groups.Peripheral blood cells;Cement-specific protein;Peripheral blood enzyme;Statistical differences in bone metabolites.The t test method compared the content of each index before and after treatment(15d-PGJ2 was treated at a dose of 200 mu/kg for 14 days).The method of factor analysis explores the internal correlation of each index.Result:RANKL,ICAM-1,TGF-β1,Th17,Treg,PDLSCs,SOST,CAP,HMGB1,CTSK,5-LOX,COX-2,NTX were higher in the case group than in the healthy group.In the case group,RANKL,ICAM-1,TGF-β1,Th17,Treg,PDLSCs,SOST,CAP,HMGB1,CTSK,5-LOX,COX-2,NTX were lower than those in the healthy group.The differences between the groups were statistically significant(P<0.05).Compared with before treatment,IL-1β,IL-17,Bfgf,YKL-40,BMP-2,ICTP,PICP,CTX were significantly decreased after treatment.RANKL,ICAM-1,TGF-β1,Th17,Treg,PDLSCs,SOST,CAP,HMGB1,CTSK,5-LOX,COX-2,NTX were significantly increased.The differences were statistically significant(P<0.05).Factor analysis shows that four common factors can be extracted from 21 indicators,and the cumulative contribution rate is 96.993%.Conclusions:The treatment of 15d-PGJ2 in patients with periodontal disease with maxillary defects can significantly affect the expression of multiple characteristic indicators,which may involve four mechanisms:dysregulation of cell differentiation or migration,local inflammation or immune imbalance,destruction of alveolar bone microstructure,load or stimulation,and remodeling.The specific pathway related to this is still to be further explored.

A novel porcine acellular dermal matrix scaffold used in periodontal regeneration

Regeneration of periodontal tissue is the most promising method for restoring periodontal structures.To find a suitable bioactive three- dimensional scaffold promoting cell proliferation and differentiation is critical in periodontal tissue engineering.The objective of this study was to evaluate the biocompatibility of a novel porcine acellular dermal matrix as periodontal tissue scaffolds both in vitro and in vivo.The scaffolds in this study were purified porcine acellular dermal matrix(PADM) and hydroxyapatite-treated PADM(HA-PADM). The biodegradation patterns of the scaffolds were evaluated in vitro.The biocompatibility of the scaffolds in vivo was assessed by implanting them into the sacrospinal muscle of 20 New Zealand white rabbits.The hPDL cells were cultured with PADM or HA-PADM scaffolds for 3,7,14,21 and 28 days.Cell viability assay,scanning electron microscopy(SEM),hematoxylin and eosin(H&E) staining, immunohistochemistry and confocal microscopy were used to evaluate the biocompatibility of the scaffolds.In vitro,both PADM and HA-PADM scaffolds displayed appropriate biodegradation pattern,and also,demonstrated favorable tissue compatibility without tissue necrosis,fibrosis and other abnormal response.The absorbance readings of the WST-1 assay were increased with the time course, suggesting the cell proliferation in the scaffolds.The hPDL cells attaching,spreading and morphology on the surface of the scaffold were visualized by SEM,H&E staining,immnuohjstochemistry and confocal microscopy,demonstrated that hPDL cells were able to grow into the HA-PADM scaffolds and the amount of cells were growing up in the course of time.This study proved that HA-PADM scaffold had good biocompatibility in animals in vivo and appropriate biodegrading characteristics in vitro.The hPDL cells were able to proliferate and migrate into the scaffold.These observations may suggest that HA-PADM scaffold is a potential cell carrier for periodontal tissue regeneration.

Application of dental stem cells in three-dimensional tissue regeneration

Dental stem cells can differentiate into different types of cells.Dental pulp stem cells,stem cells from human exfoliated deciduous teeth,periodontal ligament stem cells,stem cells from apical papilla,and dental follicle progenitor cells are five different types of dental stem cells that have been identified during different stages of tooth development.The availability of dental stem cells from discarded or removed teeth makes them promising candidates for tissue engineering.In recent years,three-dimensional(3D)tissue scaffolds have been used to reconstruct and restore different anatomical defects.With rapid advances in 3D tissue engineering,dental stem cells have been used in the regeneration of 3D engineered tissue.This review presents an overview of different types of dental stem cells used in 3D tissue regeneration,which are currently the most common type of stem cells used to treat human tissue conditions.

Effectiveness of two regeneration materials in autogenous tooth transplantation in larger sockets:an experimental study in beagle dogs

Objective： To evaluate the effectiveness of regenerous tissue and bone substitute in autogenous tooth transplantation in the larger recipient socket. Methods：In 3 Beagle dogs, 18 incisors were transplanted to the recipient sockets, 2 mm wider mesio-distally. The regenerous tissue group, the bone substitute group and the control group contained 7, 7 and 4 teeth respectively. No additional material was used in control group. Clinical and radiographic examinations were done every month and were sacrificed 3 months later. Subsequently, decalcified sections were prepared for routine histological evaluation. Ordinal scores for root surface resorption were analyzed using the Kruskal-Wallis test. Results：All donor teeth survived. A statistically significant difference was found among all three treatment groups（P= 0.0001）. The proliferating tissue in space positively affected the periodontal healing without any resorption. Inflammatory resorption of the root surface and formation of new bone were observed in the bone substitute group. Surface resorptions of the roots were found in the control group. Conclusion：Proliferating tissues enhance the regeneration of periodontal tissues in larger recipient sockets and prevent root resorption. Sinbone HT is beneficial for the stabilization of the transplanted teeth in larger sockets.

Dimethyloxallyl glycine/nanosilicates-loaded osteogenic/angiogenic difunctional fibrous structure for functional periodontal tissue regeneration

The coupled process of osteogenesis-angiogenesis plays a crucial role in periodontal tissue regeneration.Although various cytokines or chemokines have been widely applied in periodontal in situ tissue engineering,most of them are macromolecular proteins with the drawbacks of short effective half-life,poor stability and high cost,which constrain their clinical translation.Our study aimed to develop a difunctional structure for periodontal tissue regeneration by incorporating an angiogenic small molecule,dimethyloxalylglycine(DMOG),and an osteoinductive inorganic nanomaterial,nanosilicate(nSi)into poly(lactic-co-glycolic acid)(PLGA)fibers by electrospinning.The physiochemical properties of DMOG/nSi-PLGA fibrous membranes were characterized.Thereafter,the effect of DMOG/nSi-PLGA membranes on periodontal tissue regeneration was evaluated by detecting osteogenic and angiogenic differentiation potential of periodontal ligament stem cells(PDLSCs)in vitro.Additionally,the fibrous membranes were transplanted into rat periodontal defects,and tissue regeneration was assessed with histological evaluation,micro-computed tomography(micro-CT),and immunohistochemical analysis.DMOG/nSi-PLGA membranes possessed preferable mechanical property and biocompatibility.PDLSCs seeded on the DMOG/nSi-PLGA membranes showed up-regulated expression of osteogenic and angiogenic markers,higher alkaline phosphatase(ALP)activity,and more tube formation in comparison with single application.Further,in vivo study showed that the DMOG/nSi-PLGA membranes promoted recruitment of CD90+/CD34stromal cells,induced angiogenesis and osteogenesis,and regenerated cementum-ligament-bone complex in periodontal defects.Consequently,the combination of DMOG and nSi exerted admirable effects on periodontal tissue regeneration.DMOG/nSi-PLGA fibrous membranes could enhance and orchestrate osteogenesis-angiogenesis,and may have the potential to be translated as an effective scaffold in periodontal tissue engineering.

L-cysteine-modified chiral gold nanoparticles promote periodontal tissue regeneration

Gold nanoparticles(AuNPs)with surface-anchored molecules present tremendous potential in tissue regeneration.However,little is known about chiral-modified AuNPs.In this study,we successfully prepared L/D-cysteine-anchored AuNPs(L/D-Cys-AuNPs)and studied the effects of chiral-modified AuNPs on osteogenic differentiation and autophagy of human periodontal ligament cells(hPDLCs)and periodontal tissue regeneration.In vitro,more L-Cys-AuNPs than D-Cys-AuNPs tend to internalize in hPDLCs.L-Cys-AuNPs also significantly increased the expression of alkaline phosphatase,collagen type 1,osteocalcin,runt-related transcription factor 2,and microtubule-associated protein light chain 3 II and decreased the expression of sequestosome 1 in hPDLCs compared to the expression levels in the hPDLCs treated by D-Cys-AuNPs.In vivo tests in a rat periodontal-defect model showed that L-Cys-AuNPs had the greatest effect on periodontal-tissue regeneration.The activation of autophagy in L-Cys-AuNP-treated hPDLCs may be responsible for the cell differentiation and tissue regeneration.Therefore,compared to D-Cys-AuNPs,L-Cys-AuNPs show a better performance in cellular internalization,regulation of autophagy,cell osteogenic differentiation,and periodontal tissue regeneration.This demonstrates the immense potential of L-Cys-AuNPs for periodontal regeneration and provides a new insight into chirally modified bioactive nanomaterials.

PREPARATION OF CHITOSAN/HYDROXYAPATITE GUIDED MEMBRANE USED FOR PERIODONTAL TISSUE REGENERATION

In an effort to develop biomaterials to meet guided tissue regeneration （GTR） standards for periodontal tissue recovery, a homogeneous and transparent chitosan （CS）/hydroxyapatite （HA） membrane with potential applications as GTR barrier in periodontal therapy has been prepared via in situ compositing. The membrane has been designed to have a smoothrough asymmetric structure that meets the demand for GTR. Component and morphology of the membrane are characterized by XRD and SEM. It can be indicated that HA was in situ synthesized uniformly in the CS membrane. Mechanical experiments of the membranes with various HA contents show that their tensile strengths are adequate for periodontal therapy. Biological properties of the membrane have been performed by cell toxicity assays, hemolysis tests and animal experiments. Results indicate that the membrane has good biocompatibility and inductive effect for cell growth. Therefore this membrane can be potentially applied as GTR barrier membrane for periodontal tissue regeneration.

Periodontal-orthodontic interdisciplinary management of a“periodontally hopeless”maxillary central incisor with severe mobility:A case report and review of literature

BACKGROUND Treating periodontally hopeless teeth with advanced bone resorption and severe tooth mobility is a great challenge for both orthodontists and periodontists.Biofilm-induced periodontal inflammation and occlusal trauma-related inflammation may synergistically aggravate tooth mobility.This case report illustrates that even periodontally hopeless teeth can be saved and have long-term stability with comprehensive periodontal treatment to control periodontal inflammation and promote periodontal bone regeneration and intricate orthodontic mechanical control to correct cross bite and occlusal trauma.CASE SUMMARY A 27-year-old female patient whose chief complaint was severe tooth mobility and discomfort of the maxillary incisor was diagnosed with severe aggressive periodontitis by clinical and radiographic examinations.To reduce tooth mobility and establish stable occlusion,we combined orthodontic treatment with periodontal therapy to preserve the tooth.Orthodontic treatment was performed after basic periodontal therapy and periodontal surgery.The loosened upper right central incisor was successfully retained,and the periodontal tissue remained stable during follow-up.CONCLUSION Teeth with severe mobility and bone loss can be saved through interdisciplinary treatment when periodontal inflammation is strictly controlled.

Animal models for testing biomaterials in periodontal regeneration

Periodontitis is a prevalent oral disease. It can cause tooth loss and has a significant impact on patients’ quality of life. While existing treatments can only slow the progression of periodontitis, they are unable to achieve complete regeneration and functional reconstruction of periodontal tissues. As a result, regenerative therapies based on biomaterials have become a focal point of research in the field of periodontology. Despite numerous studies reporting the superiority of new materials in periodontal regeneration, limited progress has been made in translating these findings into clinical practice. This may be due to the lack of appropriate animal models to simulate the tissue defects caused by human periodontitis. This review aims to provide an overview of established animal models for periodontal regeneration, examine their advantages and limitations, and outline the steps for model construction. The objective is to determine the most relevant animal models for periodontal regeneration based on the hypothesis and expected outcomes.

Application of Induced Pluripotent Stem Cells Derived from Human Periodontal Ligament Cells in Bone Regeneration

The purpose of this study was to primarily culture human periodontal ligament cells(hPDLCs)and to reprogram hPDLCs with exogenous genes via a lentivirus-mediated transfection system.Then induced pluripotent stem cells derived from h PDLCs(hPDLC-iPSCs)were identified.Alizarin red staining was used to observe the formation of mineralized nodules and real-time Polymerase Chain Reaction(PCR)was used to detect the expression of osteogenic genes.For the in vivo experiment,nude mouse skull defect models were established and cell sheets were made to repair the bone defect.The reprogrammed cells were positive for alkaline phosphatase(ALP)staining and embryonic stem cells(ESCs)-specific proteins,and could form teratomas.After osteogenic induction,alizarin red staining showed that the number of mineralized nodules in the h PDLC-i PSCs group was more and the osteogenic related factors ALP,osteocalcin(OCN),Col-I and Runx2 were also expressed higher in hPDLC-iPSCs.The hPDLC-iPSC cell sheets were all successfully made.Histological analysis showed that the h PDLC-i PSC cell sheet got new bone formation.These results demonstrated that hPDLC-iPSCs were successfully generated from human periodontal ligament fibroblasts and hPDLC-iPSC cell sheets provided new options for bone tissue engineering.

An Overview of the Use of Medicinal Plants in Regenerative Dentistry

Aim: The oral cavity has the particularity to host multiple hard and soft tissues, in this paper, we will discuss the current therapies that lead to cell differentiation by regenerative therapies and the future alternatives proposed by medicinal plants and all the regenerative potential of these different tissues. Material and Methods: A detailed review of the literature through the various search engines: Scopus, PubMed, google scholar, Cochrane, etc., uses the selected keywords to explore the effect of the regenerative potential of several medicinal plants. Results: Through our research, we have proceeded to sort different medicinal plants, according to their repairing and regenerative potential on the different tissues of the oral cavity. Conclusion: Future studies are conceivable to explore the opportunities and potential provided by medicinal plants in the field of regenerative dentistry.

Exposure to Hyaluronan and Radon-Containing Water during the Treatment of Periodontal Pockets

Hyaluronic acid (HA) preparations have emerged as pivotal components in contemporary dentistry, gaining widespread recognition for their multifaceted roles in various biological functions. Extensive literature underscores the significance of HA in maintaining tissue water balance, fostering cell proliferation, promoting rapid cell migration, influencing cell differentiation during organism development, and facilitating tissue regeneration. Notably, HA’s interactions with cell surface receptors contribute to the viscosity of synovial fluid, activate the immune system, and enhance cartilage elasticity. Beyond these established functions, HA has also been investigated for its potential involvement in determining and studying the hormetic effects of radon water, adding a novel dimension to its applications in dental research. A thorough exploration of existing studies reveals a nuanced understanding of how HA interventions impact the outcomes of dental procedures. The comprehensive scope of these investigations allows for a more accurate assessment of the potential effectiveness of specific interventions and provides valuable insights into post-procedural prognoses for individual patients. This synthesis of literature serves as the foundation for elucidating the intricate interplay between HA, radon exposure, and their relevance in modern dental practices.

3D打印技术在口腔医学、颌面外科修复重建中的作用与优势

背景:3D打印技术独特的优势为口腔医学的发展开拓了新的思路。目的:总结3D打印技术在口腔医学中的应用进展。方法:利用计算机检索中国知网和PubMed数据库,以“3D打印,口腔科学”为中文检索词进行分类检索,以“Three-Dimensional printing,stomatology,Dentistry,prosthodontics,oral implant,orthodontics,oral and maxillofacial surgery,dental pulp disease,periodontitis”为英文检索词进行关键词检索,经阅读初步排除与文章主题不相符的文献,根据纳入标准和排除标准,最终纳入54篇文献进行汇总。结果与结论:在口腔医学领域,3D打印技术的应用范围正迅速拓展,逐步取代传统的临床诊断和治疗方式,通过结合数字化技术和先进的材料科学,3D打印可以精确地创建三维模型,为口腔疾病治疗提供了个性化解决方案,确保医师能够在手术前进行详尽的规划和预览,提高手术的安全性。3D打印技术在定制化义齿制作、个性化种植、无托槽隐形矫治等多方面呈现出了显著优势,基于此项技术,医师可以根据患者口腔结构和需求实行精准设计与制作,为患者带来良好的治疗体验和预后效果。3D打印技术在微创牙髓治疗及牙周组织再生方面也展现出了巨大潜力,3D打印的支架和植入物可为干细胞提供适宜环境,促进牙周组织的再生和修复,但目前3D打印在再生治疗仍处于发展阶段,还需更多的研究和实践来验证其临床应用的效果和安全性。

活性氧影响牙周炎发生发展及牙周组织再生

背景:活性氧在牙周炎发生发展和牙周组织再生过程中发挥双刃剑作用,低浓度的活性氧诱导牙周膜成纤维细胞的分化,过量的活性氧会造成牙周组织损伤。炎症发生时,牙周组织中的活性氧聚集,通过多种细胞信号通路或通过氧化还原反应诱导细胞和组织的损伤。目的:对活性氧在牙周炎发生发展及牙周组织再生中的双刃剑效果进行综述,为临床治疗牙周炎及促进牙周组织再生提供潜在靶点及治疗思路。方法:通过检索1990年4月至2023年4月PubMed及中国知网数据库,英文检索词为“periodontal tissue engineering,periodontal defect,regeneration of periodontal tissue,chronic periodontitis,reactive oxygen species,oxidative stress,antioxidative stress,oxidative injuries,free radicals,reactive nitrogen species”,中文检索词为“牙周组织工程,牙周缺损,牙槽骨丧失,牙周组织再生,牙周炎,破骨细胞,氧化应激,抗氧化,活性氧”,经过对每条文献文题、摘要的筛选,排除与研究目的相关性差及内容陈旧、重复的文献,对最终符合标准的77篇文献进行综述。结果与结论:(1)活性氧是一种反应活性较高的自由基,在细菌入侵时活性氧经中性粒细胞的呼吸爆发作用大量释放,经其氧化还原反应或作为多效性生理信号传导剂在体内发挥双刃剑作用。(2)在牙周炎中,低浓度的活性氧可以杀灭入侵的病原菌,但高浓度的活性氧经JNK、RANK、Wnt/β-连环蛋白等通路促进炎症因子分泌,促进免疫损伤或通过氧化反应直接损伤组织等方式加重牙周炎症。(3)在牙周组织再生过程中,低浓度的活性氧可以经Nrf2等通路促进牙周膜干细胞的增殖与分化,并能促进血管内皮生长因子的分泌进而促进血管再生。这为牙周组织再生提供了种子及营养的环境,对促进牙周组织再生极为重要,而高浓度的活性氧则会降低牙周膜干细胞的活性,并损伤内皮细胞,不利于血管再生。这将影响伤口愈合,抑制牙周组织再生。(4)因此,探索活性氧在牙周炎发生发展和牙周组织再生中的作用并发现其作用的潜在机制,并探索其发挥减轻牙周炎症并促进牙周组织再生的适宜浓度,对未来临床牙周炎和牙周组织再生的治疗具有重要意义。以活性氧作为靶点,探索减轻牙周炎症并促进牙周膜干细胞活性及血管再生的方法,可能成为临床上有效治疗牙周炎并促进牙周组织再生的方法。

巨噬细胞极化在牙周炎发病及治疗中的作用

背景:菌斑生物膜引发的宿主免疫反应是牙周炎进展和破坏的始作俑者,巨噬细胞是参与其中的主要免疫细胞,在炎症发生发展过程中发挥着重要作用。目的:主要对巨噬细胞极化与牙周炎的关系及通过调控巨噬细胞极化治疗牙周炎的相关进展进行综述。方法:应用计算机检索PubMed和中国知网数据库1990-2023年发表的相关文献,英文检索词为“macrophage polarization,M1/M2 macrophage,periodontitis,periodontitis treatment,macrophage polarization and periodontitis,osteoimmunology,ferroptosis,macrophage polarization and ferroptosis,periodontitis and ferroptosis”,中文检索词为“巨噬细胞极化,M1/M2巨噬细胞,牙周炎,牙周炎治疗,骨免疫,铁死亡”。经初筛后,选定96篇文献进行综述。结果与结论:巨噬细胞不同表型之间的转换与牙周炎组织破坏密切相关,其分泌的多种细胞因子和炎症递质参与调控了牙周组织的破坏与修复过程,调节巨噬细胞表型及细胞因子分泌有助于降低牙周炎炎症水平、改善牙周微环境,从而减少组织破坏或促进牙周组织再生。目前已有许多研究着力于开发药物或生物材料来调节巨噬细胞功能,从而达到免疫调控治疗牙周炎的目的,但由于巨噬细胞的作用贯穿牙周炎发生发展过程,在抗感染、骨破坏和骨修复过程中均扮演重要角色,且极化本身是一个复杂的动态过程,受诸多因素的影响,所以仍需探索更多可能的机制来明确材料或药物与巨噬细胞间的交互作用。

细胞衍生物在牙周组织再生中的应用

背景:包括脱细胞外基质、外泌体、凋亡囊泡及条件培养基在内的细胞衍生物具有免疫调节、促进血管形成、骨再生、韧带重塑的作用,具有促进干细胞的趋化、迁移、增殖和黏附的能力,其优良的特性使其在牙周组织工程方面有良好的应用前景和临床转化价值。目的:综述细胞外基质、外泌体、凋亡囊泡和条件培养基4种细胞衍生物的特点及在牙周复杂组织结构再生修复领域的作用及最新进展。方法:以“regeneration,periodontal tissue,tissue engineering,decellularized matrix,exosome,apoptotic extracellular vesicle,condition medium”为英文检索词,以“再生、牙周组织、组织工程、外泌体、凋亡囊泡、细胞外基质、条件培养基”为中文检索词,检索PubMed和中国知网数据库发表的相关文献,最后纳入76篇文献进行分析与讨论。结果与结论:①在4种细胞衍生物中,细胞外基质具备最好的机械性能和纤维结构,在牙周组织工程中作为生物支架提供物理化学信号并参与力学信号转导,适用于需要支架支持的牙周再生场景;近年来,可溶性脱细胞基质生物墨水的发展为个性化牙周缺损再生支架的制作提供了可能。②外泌体是成分最单一的细胞衍生物,具备免疫调节的作用,促进细胞迁移分化;作为载体,可用于搭载目标分子调控牙周再生,促进韧带重塑和骨再生,适合用于牙周组织工程载药的场景。③凋亡囊泡是凋亡过程中产生的、具有强免疫调节作用的胞外囊泡,可以招募干细胞和巨噬细胞,并通过信号转导决定干细胞的命运,可以用于需要改善免疫调节的场合以促进牙周再生,工程化胞外囊泡是目前研究的热点,有望用于靶向调节体内免疫。④条件培养基的提取简单,且是完全无创的,它为组织再生提供必需的营养物质和生长因子,这些成分对于成功的牙周再生至关重要,因此条件培养基尤其适用于体外研究细胞之间相互作用,在未来的高通量检测中具有举足轻重的地位。

外泌体在牙周再生应用的研究进展

牙周病在中国人群中的患病率高达90%以上,现有治疗技术仅能控制疾病发展,诱导骨组织再生能力成为治疗的希望和难点。外泌体是一类来源于核内体的多囊泡结构物,近年来将其应用于牙周再生领域的研究越来越多。该文将近年来外泌体在牙周再生领域的应用进行综述,有望为牙周再生治疗提供新的思路。