Comparative Cytological and Histopathological Study of Peri-Implantitis and Periodontitis

Peri-implant diseases, such as peri-implant mucositis and peri-implantitis, pose significant challenges to the long-term prognosis of dental implants. This study aimed to comprehensively compare peri-implantitis with periodontitis from cytological and histopathological perspectives, shedding light on the morphological characteristics associated with peri-implantitis. Thirteen patients, including six with peri-implantitis and seven with periodontitis, were included in the study. Cytological examination of affected gingival mucosa revealed distinct differences between the two conditions. Peri-implantitis exhibited an inflammatory background predominantly composed of neutrophils with lobulated nuclei, accompanied by stratified squamous epithelial cells showing signs of keratinization. In contrast, periodontitis showed a similar neutrophilic inflammatory background but with non-keratinized epithelial cells. Histopathological examination further confirmed these differences, with peri-implantitis showing keratinized epithelium in the inner epithelial layer. This histological finding aligns with the notion that peri-implantitis has a distinct mucosal profile compared to periodontitis. Additionally, cytological analysis revealed that peri-implantitis had a lower occurrence rate of Light green-positive cells, indicating a tendency toward keratinization. This finding suggests that the presence of keratinized mucosa might be associated with peri-implant health, although further research is needed to clarify this relationship. Overall, this study demonstrates the potential of cytological examination and Papanicolaou staining for assessing mucosal inflammatory conditions and distinguishing between keratinized and non-keratinized cells. These findings underscore the utility of oral mucosal smears as a valuable tool for diagnosing peri-implantitis and enhancing our understanding of its pathogenesis.

Investigation of Bacteria Species Most Involved in Peri-Implantitis

Purpose: Currently, bacteriological examinations of implant treatments target periodontopathic bacteria such as red complex bacteria, including Porphyromonas gingivalis, and detect them qualitatively or quantitatively. However, it seems that those examinations do not reflect the peri-implant tissue conditions precisely, because periodontopathic bacteria are also frequently detected from healthy peri-implant sites. The purpose of the present study was to investigate bacteria species most involved in peri-implantitis using a PCR method. Methods: Polymerase chain reaction (PCR) primers in this study were designed based on partial sequences of 16S rDNA of bacteria species involved in peri-implantitis that were described in numerous previous studies. Peri-implant sulcus fluid (PISF) samples were collected from thirty periodontally healthy patients with implants (HI) and thirty patients with peri-implantitis (PI). Each detection frequency of bacteria species in PISFs of both groups was investigated using a PCR method, and was compared using Fisher’s exact test. Results: In PI group, detection frequencies of Corynebacterium durum, Fretibacterium fastidiosum and Slackia exigua were significantly higher than those of HI group (p P. gingivalis and Tannerella forsythia belonging to red complex were frequently detected in the PISF samples of HI group (p > 0.05). Conclusion: It was suggested that monitoring C. durum and F. fastidiosum levels in PISF samples was useful as a clinical indicator for the evaluation of peri-implant tissue conditions.

Histopathological and Immunohistochemical Study of Peri-Implant Epithelium

Background: Human beta-defensins (HBDs), epithelial-derived antimicrobial peptides, contribute to gingival health and periodontal disease. Particularly, the upregulation of HBD-3 expression in periodontal tissues is described to contribute to periodontal tissue regeneration. Specifically, the upregulation of HBD-3 expression in periodontal tissues is described to contribute to periodontal tissue regeneration. But there has been insufficient investigation of the inner epithelium in peri-implantitis, especially the HBD expression patterns as protection against oral infection. Objectives: The purpose of this study was to investigate the histopathological characteristics of the inner implant epithelium in peri-implantitis using histopathological and immunohistochemical methods and to compare it with the inner marginal epithelium in periodontitis. Materials and Methods: The biopsied cases consisted of 10 peri-implantitis, 11 periodontitis, and 10 controls. HE observation, measurement of the thickness of the inner epithelium, and immunohistochemical analysis for Ki-67 and HBD-3 were conducted. Results: Concerning the thickness of the inner epithelium, it was significantly higher in periodontitis (156.2 [138.0, 186.4] μm) than in peri-implantitis and control, 70.7 [67.5, 97.5] μm and 80.7 [76.6, 89.4] μm, respectively (p Conclusion: Decreased production of HBD-3 in keratinocytes composing the inner implant epithelium may be one of the factors affecting tissue repair in peri-implantitis.

In vitro antimicrobial effects of grape seed extract on peri-implantitis microflora in craniofacial implants

Objective:To determine the antimicrobial effects of grape seed on peri-implantitis microflora.Methods:The grape seed extract was tested against peri-implantitis microflora most commonly found in craniofacial implants including reference strains of Staphylococcus aureus(S.aureus),Escherichia coli(E.coli),Candida albicans(C.albicans)and clinical strains of S.aureus,Klebsiella pneumonia(K.pneumonia)and Candida parapsilosis(C.parapsilosis)by disk diffusion test.Minimum inhibitory concentrations(MIC)and minimum cidal concentrations(MCC)were determined using modified agar dilution millpore method.The extract was further combined with polyethylene glycol and propylene glycol,and was tested for antimicrobial effects.Results:Grape seed extract showed positive inhibitory effects with S.aureus at MIC of 0.625 mg/mL and MCC of1.25 mg/mL respectively.However the extracts showed minimal or no reactivity against strains of E.coli,K.pneumonia,C.parapsilosis and C.albicans.The use of grape seed extract in combination with polyethylene glycol and propylene glycol also showed dose dependent inhibitory effect on S.aureus.Conclusions:The results of the study showed that grape seed has potential antimicrobial effects which can be further studied and developed to be used in the treatment of infected skinabutment interface of craniofacial implants.

Expression of cellular fibronectin mRNA in adult periodontitis and peri-implantitis: a real-time polymerase chain reaction study

Cellular fibronectin （cFn） is a type of bioactive non-collagen glycoprotein regarded as the main substance used to maintain periodontal attachment. The content of cFn in some specific sites can reflect the progress of periodontitis or peri-implantitis. This study aims to evaluate the expression of cFn messenger RNA （mRNA） in tissues of adult periodontitis and peri-implantitis by real-time fluorescent quantitative polymerase chain reaction （PCR） and to determine its clinical significance. A total of 30 patients were divided into three groups of 10： healthy, adult periodontitis and peri-implantitis. Periodontal tissue biopsies （1 mmx I mmx I mm） from each patient were frozen in liquid nitrogen. Total RNA was extracted from these tissues, and the content, purity and integrity were detected. Specific primers were designed according to the sequence, and the mRNA expression levels of cellular fibronectin were detected by real-time PCR. The purity and integrity of the extracted total RNA were both high, and the specificity of amplified genes was very high with no other pollution. The mRNA expression of cFn in the adult periodontitis group （1.526＋0.441） was lower than that in the healthy group （3.253＋0.736）. However, the mRNA expression of cFn in the peri-implantitis group （3.965＋0.537） was significantly higher than that in the healthy group. The difference revealed that although both processes were destructive inflammatory reactions in the periodontium, the pathomechanisms were different and the variation started from the transcription level of the cFn gene.

Peri-implantitis and periodontitis: Use of bacteriological test in dental practice

Peri-implantitis has been defined as an inflamematory condition involving dental implants, surrounding mucosa and bone, which lose supporting bone. Although high success rates for endosseous implants have been reported, failures occur, and some implants are lost or removed. At least 10% of the failures have been suggested to be the result of peri-implantitis. One of the major causes of the peri-implantitis is the bacterial colonization of implant surfaces but additional risk factors such as periodontitis, poor oral hygiene, tobacco consumption, prepost operative therapies and genetic susceptibility should be considered. In the present study a real-time PCR bases assay was designed to detect and quantify red complex species, then used to investigate 307 periodontal pocket samples from 127 periodontitis patients and 180 controls. Results demonstrated a significant higher prevalence of red complex species and increased amount of Porphyromonas gingivalis and Treponema denticolain periodontal pocket of periodontitis. Since a higher risk of peri-implantitis occurs in periodontally affected patients, detection and treatment of bacteria is a fundamental objective to ensure dental implant survival.

Health Indicator Bacteria That Is Useful for Risk Assessment of Peri-Implantitis

We established a novel identification method for oral Rothia species using one-step multiplex PCR analysis to investigate whether the monitoring of oral Rothia species levels is useful for peri-implantitis risk assessment, and to examine the oxygen concentration that these organisms need for growth in vitro. The mean number and proportion of Rothia aeria in peri-implant sulcus fluid (PISF) samples was significantly higher in the healthy implant group than in the peri-implantitis group (P < 0.05). Moreover, R. aeria under aerobic conditions vigorously grew compared with those under anaerobic conditions, and this organism grew only at the upper layer where high oxygen concentrations existed in a semi-liquid nutrient medium. Therefore, the monitoring of R. aeria levels may be suitable as an indicator of healthy peri-implant tissue conditions for the prevention of peri-implantitis.

Dental Implant Patients Grouped by the Brinkman Index: Their Attitude toward Smoking, Nicotine Dependence, and Knowledge of Peri-Implantitis

Purpose: This study investigated the attitude of patients, grouped by the Brinkman index, towards smoking by using the Kano Test for Social Nicotine Dependence (KTSND) and their knowledge of peri-implantitis. Methods: The participants were 3093 new patients who visited the Tokyo Medical and Dental University Hospital from January 2012 to December 2013 for an oral implant. The methodology included a questionnaire about sex, age, smoking status, daily average number of cigarettes, years of smoking, knowledge of peri-implantitis, and the KTSND. The patients were grouped according to their smoking status by calculating their Brinkman index (over 200 or not): current smokers with the possibility of nicotine dependence (BI(+)CS), current smokers with no possibility of nicotine dependence (BI(-)CS), ex-smokers (ES), and non-smokers (NS). The Brinkman index is obtained by multiplying one’s daily average number of cigarettes by the number of years they have been smoking. Results: Data were collected from 2182 respondents (response rate = 71%). The KTSND scores of BI(+)CS (16.89 ± 4.26) were significantly higher than the scores of ES (11.99 ± 4.52) and NS (11.53 ± 5.01). In current smokers, there were no significant differences between BI(+)CS and BI(-)CS. The patients replied “I don’t know” about peri-implantitis most often in all groups;however, there were no significant differences between the groups. Discussion: BI(+)CS were more dependent on nicotine in social situations than the other groups were. In Japan, a Brinkman index over 200 is required for a nicotine-dependence management fee to be instituted for health insurance treatment. This is a major concern for young smokers, who may be excluded from treatment because their years of smoking are substantially less. Results revealed that there were no significant differences between BI(+)CS and BI(-)CS. Therefore, it was suggested that the Brinkman index did not sufficiently group the participants.

IL-6对种植体周围炎大鼠牙龈组织中TNF-α表达的影响

目的 探究白细介素(IL-6)对种植体周围炎大鼠牙龈组织中肿瘤坏死因子-α(TNF-α)表达的机制。方法 按照随机数字表法将40只大鼠分为假手术组(sham组)、种植体周围炎大鼠模型组(PI组)、种植体周围炎大鼠模型给予IL-6抑制剂Tocilizumab组(Tocilizumab组)、在Tocilizumab组的基础上给予NF-κB/p65激活剂LPS组(LPS组),每组10只。观察种植体周围软组织袋深度(PPD)、探诊出血(BOP)、出血指数(BI)和牙龈指数(GI)。测量种植体周围骨高度和骨密度(Micro-CT法);检测种植体周围牙龈组织炎症浸润(HE染色);RT-PCR检测种植体周围牙龈组织中IL-6、TNF-α mRNA表达;检测牙龈组织中p-p65蛋白表达(蛋白质印迹法)。结果 与sham组比较,PI组大鼠种植体软组织中PPD(近颊、远颊、近舌、远舌)、BOP、BI和GI均明显增加(P<0.05);与PI组比较,Tocilizumab组大鼠种植体软组织中PPD(近颊、远颊、近舌、远舌)、BOP、BI和GI均明显降低(P<0.05);与Tocilizumab组比较,种植体软组织中PPD(近颊、远颊、近舌、远舌)、BOP、BI和GI均明显增加(P<0.05)。与sham组比较,PI组大鼠种植体骨高度、牙槽骨密度明显降低,IL-6、TNF-α mRNA和p-p65蛋白表达增加(P<0.05);与PI组比较,Tocilizumab组大鼠种植体骨高度、牙槽骨密度明显升高,IL-6、TNF-α mRNA和p-p65蛋白表达低于(P<0.05);LPS组大鼠种植体骨高度、牙槽骨密度低于Tocilizumab组,IL-6、TNF-α mRNA和p-p65蛋白表达高于Tocilizumab组(P<0.05)。结论 IL-6抑制剂可通过抑制牙髓组织中NF-κB通路激活,进而抑制种植体周围炎大鼠牙龈组织中TNF-α释放,从而减轻大鼠种植体周围炎发展。

miR-27a和miR-128在种植体周围炎患者龈沟液中的水平及其与骨吸收的关系

目的探讨微小RNA(miR)-27a和miR-128在种植体周围炎患者龈沟液中的水平及其与骨吸收的关系。方法将2018年1月至2021年12月于上海长征医院口腔科完成牙种植修复术的患者136例纳入研究,根据种植牙状况分为健康种植体患者66例(健康组)和种植体周围炎患者70例(炎症组)。另外,选取同期进行牙龈健康检查的志愿者70例作为对照组。收集所有纳入研究者探诊深度(PD)、龈沟出血指数(SBI)、龈沟液量、肿瘤坏死因子-α(TNF-α)、白细胞介素(IL)-6、IL-4水平的数据。采用口腔锥形束CT(CBCT)进行骨吸收测定。采用实时荧光定量聚合酶链反应(qPCR)检测龈沟液中miR-27a和miR-128水平。采用Pearson相关法分析种植体周围炎患者龈沟液中miR-27a和miR-128水平及二者与炎症因子、骨吸收量的相关性。结果与对照组相比,炎症组和健康组龈沟液中PD、SBI、龈沟液量、骨吸收量,TNF-α、IL-6、miR-128水平升高,IL-4、miR-27a水平降低,差异均有统计学意义(P<0.05);与健康组相比,炎症组龈沟液中PD、SBI、龈沟液量、骨吸收量、TNF-α、IL-6、miR-128水平升高,IL-4、miR-27a水平降低,差异均有统计学意义(P<0.05)。相关性分析显示,种植体周围炎患者龈沟液中miR-27a和miR-128水平呈负相关(r=-0.365,P=0.002)。种植体周围炎患者龈沟液中miR-27a水平与PD、SBI、骨吸收量、TNF-α、IL-6水平呈负相关(P<0.05),与IL-4水平呈正相关(P<0.05);miR-128水平与PD、SBI、骨吸收量、TNF-α、IL-6水平呈正相关(P<0.05),与IL-4水平呈负相关(P<0.05)。结论miR-128在种植体周围炎患者龈沟液中呈高水平,miR-27a呈低水平,二者与骨吸收相关。

Investigation of Peri-implant Status and Risk Variables for Implant Failure in Body of Maxilla after Oral Tumor Surgery

The aim of this study was to assess the peri-implant parameters and evaluate the clinical status with the survival of dental implants in body of maxilla after treatments of oral tumor. A follow-up examination included 27 patients who underwent the ablative tumor and （or） reconstructive surgery during a 5-year period. The follow-up protocol included clinical examination, radiological evaluation, and an interview using a standardized questionnaire. The reasons related to implant failure were studied by comparing the amount of failure with the value of marginal bone resorption, probing pocket depth, and plaque index using statistical t-test. The relationship between smoking and implant failure was analyzed statistically by chi-square test. The results showed among the 112 implants observed after implant loading, 29 have failed with the failure rate being 22.14 %. There was no significant correlation between the peri-implant status and the implant failure （P〉0.05）, however, the association of smoking and implant failure was statistically tested （P〈0.05）. It was suggested that the association of peri-implant status and implant failure in the maxilla after tumor surgery can＇t be statistically tested, however smoking was still a mainly significant factor.

仙灵骨葆对犬种植体周围炎龈沟液中IL-1α、IL-1β、IL-10、IL-17含量的影响

目的探讨仙灵骨葆对犬种植体周围炎龈沟液中白细胞介素-1α(interleukin-1α,IL-1α)、白细胞介素-1β(interleukin-1β,IL-1β)、白细胞介素-10(interleukin-10,IL-10)、白细胞介素-17(interleukin-17,IL-17)含量的影响。方法将30只犬分为实验组(20只)和对照组(10只),实验组进行种植体周围炎造模,再分为A组与B组(各10只),A组仙灵骨葆胶囊灌胃(基点),观察并且记录4周以后对犬种植体的菌斑指数(plaque index,PI)、探诊深度(probing depth,PD)、牙龈指数(gingival index,GI)及龈沟液量情况,检测基点、1周、4周、8周、12周时检测种植体龈沟液中IL-1α、IL-1β、IL-10、IL-17含量。结果实验组种植体的PI、PD、GI、龈沟液量均大于对照组,差异有统计学意义(P<0.05)。对照组、A组、B组基点时龈沟液中IL-1α、IL-1β、IL-10、IL-17含量比较差异无统计学意义(P>0.05),对照组、A组、B组龈沟液中IL-1α、IL-1β、IL-10、IL-17含量在1周、4周、8周、12周等不同时点时在组间比较差异均有统计学意义(P<0.05),对照组龈沟液中IL-1α、IL-1β、IL-10、IL-17含量在基点、1周、4周、8周、12周等不同时点时组内比较差异无统计学意义(P>0.05),A组、B组龈沟液中IL-1α、IL-1β、IL-10、IL-17含量在基点、1周、4周、8周、12周等不同时点时在组内比较差异均有统计学意义(P<0.05),A组龈沟液中IL-1α、IL-1β、IL-10、IL-17含量在4周时最高,随后逐渐下降,到12周基本与对照组水平接近,B组龈沟液中IL-1α、IL-1β、IL-10、IL-17含量在8周时最高、随后逐渐下降,到12周时仍然高于A组及对照组。结论仙灵骨葆可有助于降低犬种植体龈沟液中IL-1α、IL-1β、IL-10、IL-17水平的表达,对炎性反应有一定抑制效果。

Treatment of periodontal patients - current clinical concepts

The main goal of the treatment of patients with periodontitis is to establish adequate infection control. To satisfy demands for acceptable aesthetics and chewing function with good long-term prognosis in patients with periodontitis requires the establishment of adequate infection control. Pocket instrumentation (scaling and root planing with or without flap elevation), combined with effective self-performed supragingival plaque control measures, constitutes the basic treatment modalities.

Platelet-rich plasma for regeneration of neural feedback pathways around dental implants: a concise review and outlook on future possibilities

Along with the development of new materials, advanced medical imaging and surgical techniques, osseointegrated dental implants are considered a successful and constantly evolving treatment modality for the replacement of missing teeth in patients with complete or partial edentulism. The importance of restoring the peripheral neural feedback pathway and thus repairing the lack of periodontal rnechanoreceptors after tooth extraction has been highlighted in the literature. Nevertheless, regenerating the nerve fibers and reconstructing the neural feedback pathways around osseointegrated implants remain a challenge. Recent studies have provided evidence that platelet-rich plasma （PRP） therapy is a promising treatment for musculoskeletal injuries. Because of its high biological safety, convenience and usability, PRP therapy has gradually gained popularity in the clinical field Although much remains to be learned, the growth factors from PRP might play key roles in peripheral nerve repair mechanisms. This review presents known growth factors contributing to the biological efficacy of PRP and illustrates basic and （pre-）clinical evidence regarding the use of PRP and its relevant products in peripheral nerve regeneration. In addition, the potential of local application of PRP for structural and functional recovery of iniured peripheral nerves around dental implants is discussed.

Global Protein Expression Analysis of Molecular Markers of DS-1-47,a Component of Implantation-promoting Traditional Chinese Medicine

This study investigated the molecular markers of DS-1-47,a component of an implantation-promoting traditional Chinese medicine consisting of Astragalus mongholicus,Atractylodes macrocephala,Scutellaria baicalensis and Dipsacales,in an attempt to clarify the molecular mechanism and action targets of DS-1-47.Controlled ovarian stimulation（COS） method was used to establish the implantation dysfunction models of mice.Animals were divided into normal pregnant group,COS model group and DS-1-47 group.Laser capture microdissection-double dimensional electrophoresis-mass spectrum（LCM-DE-MS） was used to analyze the uterine protein molecules that were possibly involved in the promotion of implantation.Twenty-three proteins in DS-1-47 group were significantly changed as compared to those in COS model group,with 7 proteins down-regulated and 16 proteins up-regulated.Except for some constituent proteins,the down-regulated proteins included collagen α-1（Ⅵ） chain,keratin 7,keratin 14,myosin regulatory light chain 12 B,myosin light polypeptide 9,heat shock protein β-7,and C-U-editing enzyme APOBEC-2;the up-regulated proteins included apolipoprotein A-I,calcium regulated protein-3,proliferating cell nuclear antigen,L-xylulose reductase,and calcium binding protein.These 23 proteins that were regulated by DS-1-47 represented a broad diversity of molecule functions.The down-regulated proteins were associated with stress and immune response,and those up-regulated proteins were related to proliferation.It was suggested that these proteins were important in regulating the uterine environment for the blastocyst implantation.By identification of DS-1-47 markers,proteomic analysis coupled with functional assays is demonstrated to be a promising approach to better understand the molecular mechanism of traditional Chinese medicine.

Marginal bone loss around non-submerged implants is associated with salivary microbiome during bone healing

Marginal bone loss during bone healing exists around non-submerged dental implants. The aim of this study was to identify the relationship between different degrees of marginal bone loss during bone healing and the salivary microbiome. One hundred patients were recruited, and marginal bone loss around their implants was measured using cone beam computed tomography during a 3-month healing period. The patients were divided into three groups according to the severity of marginal bone loss.Saliva samples were collected from all subjected and were analysed using 16 SMiSeq sequencing. Although the overall structure of the microbial community was not dramatically altered, the relative abundance of several taxonomic groups noticeably changed. The abundance of species in the phyla Spirochaeta and Synergistetes increased significantly as the bone loss became more severe. Species within the genus Treponema also exhibited increased abundance, whereas Veillonella, Haemophilus and Leptotrichia exhibited reduced abundances, in groups with more bone loss. Porphyromonasgingivalis, Treponemadenticola and Streptococcus intermedius were significantly more abundant in the moderate group and/or severe group. The severity of marginal bone loss around the non-submerged implant was associated with dissimilar taxonomic compositions. An increased severity of marginal bone loss was related to increased proportions of periodontal pathogenic species. These data suggest a potential role of microbes in the progression of marginal bone loss during bone healing.

龈沟液中sICAM-1、IL-1β和HIF-1α水平与义齿种植修复并发种植体周围炎的关系

目的:探讨龈沟液中可溶性细胞间黏附分子1(sICAM-1)、白细胞介素1β(IL-1β)和缺氧诱导因子1α(HIF-1α)水平与义齿种植修复并发种植体周围炎(PI)的关系。方法:选择2019年1月—2021年12月奉城医院收治的198例义齿种植修复患者,根据义齿种植修复3个月后是否并发PI将患者分为PI组和非PI组。采用酶联免疫吸附法检测义齿种植修复前龈沟液中sICAM-1、IL-1β和HIF-1α水平。多因素Logistic回归分析并发PI的影响因素,ROC曲线分析龈沟液中sICAM-1、IL-1β和HIF-1α水平对义齿种植修复并发PI的预测价值。采用SPSS 28.0软件包对数据进行统计学处理。结果:义齿种植修复后3个月,198例患者PI发生率为17.68%(35/198)。PI组龈沟液中sICAM-1、IL-1β和HIF-1α水平显著高于非PI组(P<0.05)。多因素Logistic回归分析显示,sICAM-1(OR=1.135,95%CI:1.066~1.208)、IL-1β(OR=1.106,95%CI:1.054~1.161)和HIF-1α(OR=1.008,95%CI:1.004~1.012)升高为义齿种植修复并发PI的独立危险因素(P<0.05)。ROC曲线分析显示,龈沟液中sICAM-1、IL-1β和HIF-1α水平单独与联合预测义齿种植修复并发PI的曲线下面积分别为0.787、0.785、0.794和0.930,灵敏度分别为80.00%、74.29%、62.86%和88.57%,特异度分别为66.87%、74.85%、78.53%和85.28%。结论:龈沟液中sICAM-1、IL-1β和HIF-1α水平升高为义齿种植修复并发PI的独立危险因素,可作为义齿种植修复并发PI的辅助预测指标。

Relationship between miR-7-5p expression and ^(125)I seed implantation efficacy in pancreatic cancer and functional analysis of target genes

Objective The aim of this study was to investigate the relationship between miR-7-5p expression and intertissue-^(125)I irradiation sensitivity in pancreatic cancer tissues and to analyze the function of target genes.Methods Thirty-seven patients with unresectable pancreatic ductal adenocarcinoma(PDAC)treated with radioactive ^(125)I seed implantation were enrolled.RT-PCR was used to detect the expression level of miR-7-5p in cancer tissues and analyze the relationship between miR-7-5p expression and ^(125)I radiation sensitivity.Bioinformatic software and online tools were used to predict the miR-7-5p target genes and analyze their functional annotation and pathway enrichment.Results Radioactive ^(125)I seed implantation was followed up for 2 months.The objective response rate of the miR-7-5p high expression group was 65.0%(13/20),whereas the objective response rate of the miR-7-5p low expression group was 5.88%(1/17),and the difference between the two groups was statistically significant(χ^(2)=13.654,P<0.001).A total of 187 target genes were predicted using three databases.GO functional annotation showed that target genes were mainly involved in cellular response to insulin stimulus,regulation of gene expression by genetic imprinting,cytosol,peptidyl-serine phosphorylation,bHLH transcription factor binding,cargo loading into vesicles,cellular response to epinephrine stimulus,and nucleoplasm.KEGG pathway enrichment analysis showed that target genes were mainly involved in the ErbB signaling pathway,HIF-1 signaling pathway,axon guidance,longevity regulatory pathway,endocrine resistance,glioma,choline metabolism in cancer,and EGFR tyrosine kinase inhibitor drug resistance.Molecular complex detection analysis by Cytoscape revealed that PIGH,RAF1,EGFR,NXT2,PIK3CD,PIK3R3,ERBB4,TRMT13,and C5orf22 were the key modules of miR-7-5p target gene clustering.Conclusion The expression of miR-7-5p in pancreatic cancer tissues positively correlated with the radiosensitivity of ^(125)I seeds.Via targeted gene regulation,miR-7-5p acts on the network of multiple signaling pathways in PDAC and participates in its occurrence and development.Thus,miR-7-5p may become a predictive index of ^(125)I seed implantation therapy sensitivity in PDAC patients.

A COMPUTER SIMULATION OF HIGH-DOSE ION IMPLANTATION INTO AMORPHOUS MATERIALS

A computer program MACA was developed for simulating high-dose ion implantation into amorphous solids. The topology of amorphous solids was modelled by adjusting the free flight path distribution between collisions, so that the radial distribution function will characterize the short - range order and long - range disorder of amorphous targets. A simulation example is given.

抑制miR-145表达影响小鼠牙种植体周围炎炎症反应的实验研究

目的:探讨抑制miR-145对小鼠种植体周围炎炎症反应的影响。方法:将C57BL/6J雄性小鼠40只随机分为正常对照组、炎症对照组、炎症miR-NC组、炎症miR-inhibitor组。在各组上颌植入种植体,对3个炎症组拴丝形成种植体周围炎后,对炎症miR-inhibitor组局部注射miR-145抑制剂,在炎症miR-NC组局部注射miR-145抑制剂的阴性对照剂,微计算机断层扫描观察各组种植体周围骨丧失情况,苏木素-伊红染色观察种植体周围组织炎细胞浸润情况,实时荧光定量PCR检测种植体周围牙龈组织miR-145、趋化因子CC基序配体2(CCL2)、肿瘤坏死因子α(TNF-α)、白细胞介素1β(IL-1β)、白细胞介素10(IL-10)、基质金属蛋白酶8(MMP8)的表达水平。结果:与正常对照组小鼠相比,3个炎症组小鼠骨丧失量及炎细胞浸润明显增加(P<0.05),牙龈组织中炎症相关因子CCL2、TNF-α、IL-1β、IL-10、MMP8表达水平升高(P<0.05);抑制miR-145表达后,种植体周围炎小鼠骨丧失量、炎细胞浸润情况改善,CCL2、TNF-α、IL-1β、MMP8表达减少,IL-10表达升高(P<0.05)。结论:抑制miR-145的表达可缓解种植体周围炎炎症反应,可能与其调节牙龈组织中炎症相关因子表达有关。