白细胞介素-1β对人牙周膜成纤维细胞中MCP-1表达影响的研究

目的:探讨白细胞介素-1β(IL-1β)对人牙周膜成纤维细胞(hPDLFs)中单核细胞趋化蛋白-1(MCP-1)表达水平的影响。方法:体外分离培养的人牙周膜成纤维细胞随机分为实验组和对照组,实验组细胞以不同浓度IL-1β(1、5、10、25 ng/mL)作用24 h;对照组细胞则不加IL-1β作用。分别采用半定量逆转录聚合酶链反应(RT-PCR)检测人牙周膜成纤维细胞中MCP-1 mRNA的表达;采用免疫荧光技术观察MCP-1的表达情况;采用Western blot方法检测其蛋白表达变化。结果:对照组hPDLFs中可见微弱的MCP-1表达;实验组hPDLFs经IL-1β刺激后,MCP-1在mRNA和蛋白水平表达都增强,这种调节作用在10 ng/mL IL-1β的作用浓度时最明显(P<0.05)。结论:在IL-1β介导环境下,hPDLFs中MCP-1的表达增高,而MCP-1表达增高可能是引起外周血单核细胞向局部炎症牙周组织募集的机制之一。     

HGF在人牙周膜成纤维细胞中的表达

目的：观察HGF在人牙周膜成纤维细胞中的表达及探讨转化生长因子-β1（TGF-β1）、白细胞介素-1β（IL-1β）与HGF之间的关系。方法：分别采用IL-1β梯度浓度、最佳干预浓度和TGF-β1梯度浓度干预第5代人牙周膜成纤维细胞,并运用酶联免疫技术检测人牙周膜成纤维细胞的上清液中HGF的表达。结果：经IL-1β单独作用,人牙周膜成纤维细胞的上清液中HGF的含量较空白对照组高,并优选出IL-1β的最佳干预浓度为10 ng/mL。当一定浓度的TGF-β1和10 ng/mL的IL-1β联合干预人牙周膜成纤维细胞,该细胞上清液中HGF的含量较单独IL-1β作用组低。结论：TGF-β1能够抑制IL-1β诱导的人牙周膜成纤维细胞分泌HGF。     

IL—1ra对人牙周膜成纤维细胞骨钙素分泌的调节作用

目的：观察白细胞介素1受体拮抗剂（IL－1ra）与IL－1β对人牙周膜成纤维细胞（HPLF）骨钙素分泌的影响。方法：采用骨钙素放射免疫测定法。结果：经IL－1β单独作用的HPLF的骨钙素浓度与对照组相比有显著性差异,一定浓度的IL－1ra与IL－1β共同作用HPLF后,骨钙素浓度比单独IL－1β作用组的低,结论：IL－1ra能竞争性地抑制IL-1β的生物学活性,为进一步临床应用提供理论依据。     

机械压力对人牙周膜成纤维细胞TGF-β1蛋白表达的影响

目的：探明机械压力与人牙周膜成纤维细胞转化生长因子β1（transforming growth factor beta-1,TGF-β1）蛋白表达的关系。方法：本实验采用细胞加载装置,对人牙周膜成纤维细胞施加0kPa、250kPa、500kPa、1000kPa的压力,通过酶联免疫吸附实验,分别检测细胞受力后6h、12h、18h、24h时TGF-β1的含量。结果：加载250kPa组、500kPa组在细胞受力后各个时段TGF-β1含量没有变化;1000kPa组在细胞受力后的第12h,TGF-β1含量显著降低。结论：人牙周膜成纤维细胞合成TGF-β1受到机械压力的调控;在一定载荷作用下,TGF-β1的含量随着压力的增大而有所降低。     

IL-17对人牙周膜成纤维细胞RANKL表达的影响

目的 观察IL-17对人牙周膜成纤维细胞RANKL表达的影响,探讨IL-17调控牙周炎骨改建的可能致病机制。方法 用不同浓度（0、10、25、50 ng/mL）的IL-17处理人牙周膜成纤维细胞。选择最佳刺激浓度,用该浓度的IL-17处理细胞不同时间（0、12、24 h）。通过实时定量RT-PCR和Western-blot的方法检测细胞中骨吸收相关因子RANKL的表达水平。结果 IL-17可显著提高人牙周膜成纤维细胞RANKL的表达水平,并随着浓度的提高和刺激时间的延长而增加。结论 IL-17可上调人牙周膜成纤维细胞的RANKL表达,提示IL-17可通过调控人牙周膜成纤维细胞骨吸收相关因子的表达参与牙槽骨的改建。     

IL-1β对人牙周膜成纤维细胞OPG、RANKL mRNA表达的影响

目的:以体外培养的人牙周膜成纤维细胞(HPDLF)为研究对象,观察不同浓度的白细胞介素-1β(IL-1β)对人牙周膜成纤维细胞(HPDLF)中骨保护素(OPG)、核因子κB受体活化剂配体(RANKL)mR-NA表达的影响。方法:组织块法体外原代培养HPDLF并鉴定,以第5代HPDLF作为实验靶细胞,分别用不同浓度(0、0.01、0.1、1、10、100 ng/mL)的IL-1β进行干预,半定量逆转录聚合酶链反应(RT-PCR)检测HPDLF中OPG、RANKL mRNA的表达。结果:IL-1β在0.01～10 ng/mL浓度范围内能明显上调HPDLF中OPG mRNA的表达(P<0.05),并在0.1 ng/mL时上调作用达到最大(P<0.05)。此后,随着IL-1β浓度的增加,OPG mRNA的表达量逐渐减少。IL-1β在0.01～100 ng/mL浓度范围内均可明显上调HPDLF中RANKL、RANKL/OPGmRNA的表达(P<0.05),且呈剂量依赖性,即随着IL-1β浓度增加,HPDLF中RANKL、RANKL/OPG mRNA的表达也逐渐增加,各浓度组两两比较除10 ng/mL与100 ng/mL相比无显著性差异外,其余各组间差异均有统计学意义(P<0.05)。结论:IL-1β可促进HPDLF中RANKL mRNA的表达,上调RANKL/OPG mRNA的比值。     

白细胞介素—1β,转化生长因子—β对人牙周膜成纤维细胞D…

观察白细胞介素－１β和转化生长因子－β单儿作用、组合后对人牙周膜成纤维细胞的ＤＮＡ合成量的影响。用＾３Ｈ胸腺嘧啶脱氧核苷细胞内掺入法。结果ＤＮＡ合成量显著增多。     

高迁移率族蛋白B1对人牙髓细胞迁移能力和增殖效应的影响术

目的：观察高迁移率族蛋白B1（HMGBl）在人牙髓细胞（Human dental pulp cells,hDPCs）中的表达,以及对hDPCs增殖和迁移能力的影响。方法：采用组织块培养法,培养原代hDPCs,取第3-6代细胞用于实验。免疫荧光检测HMGBl在hDPCs中的表达及定位;分别用含不同质量浓度（0．1ng／mL、1ng／mL、10ng／mL、50ng／mL、100ng／mL、500ng／mL、1000ng／mL）HMGBl的培养液培养hDPCs,5天后采用CCK一8法检测细胞增殖能力;细胞划痕实验法观察1ng／mL质量浓度HMGBl对hDPCs迁移能力的影响。结果：HMGBl表达在hDPCs胞核：低浓度HMGBl（O．1ng／mL、1ng／mL、10ng／mL、50ng／mL、100ng／mL）明显促进细胞增殖;1ng／mLHMGBl明显促进hDPCs迁移能力。结论：HMGBl表达在正常hDPCs胞核中,细胞外低浓度HMGBl可以促进细胞增殖和迁移。     

白细胞介素－1β、转化生长因子－β对人牙周膜成纤维细胞DNA合成的影响

目的：观察白细胞介素－１β（ｉｎｔｅｒｌｅｕｋｉｎ－１β，ＩＬ－１β）和转化生长因子－β（ｔｒａｎｓｆｏｒｍｉｎｇｇｒｏｗｔｈｆａｃｔｏｒ－β，ＴＧＦ－β）单独作用、组合后对人牙周膜成纤维细胞（ｈｕｍａｎｐｅｒｉｏｄｏｎｔａｌｌｉｇａｍｅｎｔｆｉｂｒｏｂｌａｓｔ，ＨＰＬＦ）的ＤＮＡ合成量的影响。方法：用３Ｈ胸腺嘧啶脱氧核苷细胞内掺入法。结果：ＤＮＡ合成量显著增多。浓度为０．０１ｎｇ／ｍｌ的ＴＧＦ－β与浓度为１０ｕ／ｍｌ的ＩＬ－１β组合后对ＨＰＬＦ的ＤＮＡ合成量与单纯ＩＬ－１β组间无显著差异（Ｐ＞０．０５），而０．１ｎｇ／ｍｌ、１．０ｎｇ／ｍｌ的ＴＧＦ－β与三种浓度ＩＬ－１β组合后，ＨＰＬＦ的ＤＮＡ合成量显著高于单纯的ＩＬ－１β组。结论：ＩＬ－１β、ＴＧＦ－β对ＨＰＬＦ的ＤＮＡ合成有促进作用，这两种细胞因子组合并非各个细胞因子作用的简单相加     

高迁移率族蛋白B1与牙周病及糖尿病伴牙周病关系研究进展

高迁移率族蛋白B1 （high mobility group box 1 protein,HMGB1）作为高迁移率族蛋白（high mobility group protein,HMG）家族成员,是一种含量极为丰富的细胞核内非组蛋白。研究发现,其作为一种晚期炎性介质,在牙周病及糖尿病伴牙周病的发生发展过程起到重要作用。本文就HMGB1的生物学特性及其与牙周病、糖尿病伴牙周病等的关系研究进展做一综述。     

Interleukin-1β stimulates collagenase production by cultured human periodontal ligament fibroblasts

To examine the effects of interleukin-lβ (IL-1β) on collagenase production by human periodontal ligament fibroblasts (PLF) and gingival fibroblasts (GF) in Culture, collagenase activity in conditioned media was determined using a novel procedure that circumvented interference by enzyme inhibitors. Fibroblasts obtained from five paired periodontal ligament and gingival tissues were cultured for two weeks, and then incubated for a further 72 h in α-MEM supplemented with various concentrations of IL-1β (0 to 1250 pg/ml). The conditioned media from individual cultures were harvested and treated with dithiothreitol to inactivate TIMPs, and then with APMA, to activate the latent collagenase. Collagenase activity was measured fluorometrically using FITC-collagen as a substrate. IL-lβ induced a ∼2.4 to 5.2-fold increase in collagenase activity in PLF compared to a ∼1.4 to 2.2-fold increase in GF. These results are in contrast to previous studies in which collagenase activity was measured in the presence of TIMPs, and indicate that PLF are more sensitive to IL-1β than GF. Since both PLF and GF are present in periodontal lesions, it is possible that collagenase secretion stimulated by exposure to inflammatory cell products such as IL-lβ may participate in the destruction of collagen fibers involved in periodontal attachment.     

高迁移率族蛋白1在慢性牙周炎病变牙龈组织中的表达

目的 研究慢性牙周炎病变牙龈组织中高迁移率族蛋白1（HMGB1）的表达。方法 提取健康志愿者外周血单核细胞（PBMC）,以1 pg·mL-1的细菌脂多糖（LPS）刺激细胞,24 h后用免疫荧光染色法检测HMGB1的表达,48 h 后用酶联免疫吸附试验检测细胞上清液中HMGB1的表达;分别以50 ng·mL-1肿瘤坏死因子-α（TNF-α）和100 ng? mL-1 HMGB1刺激PBMC,48 h后检测细胞上清液中HMGB1和TNF-α的表达。另外收集健康者和慢性牙周炎患者的牙龈组织和龈沟液,分别检测牙龈组织和龈沟液内HMGB1的表达。结果 LPS刺激PBMC 24 h后,HMGB1自细胞核移出至细胞质中;刺激48 h后,细胞上清液中HMGB1的表达量明显高于对照组（P<0.01）。TNF-α和HMGB1分别刺激 PBMC 48 h后,上清液中HMGB1和TNF-α的表达水平较对照组亦有明显增强（P<0.01）。在慢性牙周炎牙龈组织上皮钉突下方浸润的细胞中,HMGB1自细胞核转移至细胞质和细胞外;其龈沟液内HMGB1的表达量也明显高于健康对照组（P<0.01）。结论 HMGB1可能在牙周炎病理进程中有重要作用。     

两种体外培养人牙周韧带成纤维细胞方法比较

目的探索一种在体外短时间内简便、可靠获取大量人牙周韧带成纤维细胞(human periodontal ligament fibroblast,HPLF)、建立稳定的体外培养体系的方法。方法采用酶消化法和组织贴块法进行HPLF体外原代培养及传代培养的对比研究。通过细胞形态学、超微结构观察及波形蛋白和角蛋白免疫组化染色等对细胞进行定性研究;测定细胞生长曲线了解细胞生长基本规律及其增殖能力。结果采用酶消化法和组织贴块法均可成功的进行HPLF连续传代培养。最高传代数为30代。培养的细胞具有成纤维细胞的典型形态,波形蛋白染色阳性,角蛋白染色阴性,生长稳定期倍增时间为48~72h。组织块培养法需培养时间长,原代培养获取的细胞量较少,较难传代。酶消化法可短时间内获取大量细胞,细胞产量高,但操作手续复杂易污染,细胞易受损伤。结论成功建立了一个稳定的HPLF体外培养体系。除常用的组织块法外,胰蛋白酶及胶原酶联合消化法不失为一种简便、快速、可靠的组织原代分离培养方法。     

Keratinocyte growth factor mRNA expression in periodontal ligament fibroblasts

Keratinocyte growth factor (KGF) is a fibroblast growth factor which mediates epithelial growth and differentiation. K.GF is expressed in subepithelial fibroblasts, but generally not in fibroblasts of deep connective tissue, such as fascia and ligaments. Here we demonstrate that KGF mRNA is expressed in periodontal ligament fibroblasts, and that the expression is increased upon serum stimulation. Fibroblasts from human periodontal ligament, from buccal mucosa. from gingival, and from skin were established from explants. Alkaline phosphatase activity was used as an indicator of the periodontal nature of fibroblasts. Cells were first cultured in DMEM with 0.5% fetal calf serum (PCS) and then incubated for 8 h, and 72 h in fresh DMEM with 10% PCS. Total RNA was isolated and used for Northern blotting with a P³²-labeled KGP cDNA. probe. Total RNA from cultured keratinocytes was used as negative controls. KGF mRNA was found in all cultured fibroblasts. Upon addition of 10% PCS to the cell cultures, an increase in KGF mRNA levels was noticed especially after 72 h. Furthermore. RT-PCR analysis of material scraped from the tooth root surface indicated the presence of KGF mRNA even in non cultured periodontal ligament cells.     

A regulatory role of Piezo1 in apoptosis of periodontal tissue and periodontal ligament fibroblasts during orthodontic tooth movement

Investigation on the effect of Piezo1 on periodontal tissue and periodontal ligament fibroblasts (PDLFs) under mechanical stress and the underlying mechanism. The orthodontic tooth movement rat model was established via an orthodontic spiral tension spring. PDLFs were cultured and subjected to 2.0 g/cm² static compressive loading. Blocked the Piezo1 via Piezo1 inhibitor, GsMTx4. TUNEL staining and flow cytometry determined the apoptosis rate of periodontal tissue and PDLFs in rats. Expression of Piezo1, p-p38 and ERK1/2 was analysed by immunofluorescence assay and western blotting. Piezo1 inhibitor GsMTx4 relieved the increased expression of Piezo1, ERK1/2 and p-p38, and alleviated apoptosis in periodontal tissue and PDLFs under compressive loading. Piezo1 inhibition can alleviate force-induced apoptosis and damage in rats' periodontal tissue and PDLFs, and regulate the p38/ERK1/2 signalling pathway.     

Effects of enamel matrix derivative and transforming growth factor-beta1 on human periodontal ligament fibroblasts

AIM: The objective of this study was to evaluate the effects of enamel matrix derivative (EMD), transforming growth factor-beta1 (TGF-beta1), and a combination of both factors (EMD+TGF-beta1) on periodontal ligament (PDL) fibroblasts. MATERIAL AND METHODS: Human PDL fibroblasts were obtained from three adult patients with a clinically healthy periodontium, using the explant technique. The effects of EMD, TGF-beta1, or a combination of both were analysed on PDL cell proliferation, adhesion, wound healing, and total protein synthesis, and on alkaline phosphatase (ALP) activity and bone-like nodule formation. RESULTS: Treatment with EMD for 4, 7, and 10 days increased cell proliferation significantly compared with the negative control (p<0.05). At day 10, EMD and EMD+TGF-beta1 showed a higher cell proliferation compared with TGF-beta1 (p<0.01). Cell adhesion was significantly up-regulated by TGF-beta1 compared with EMD and EMD+TGF-beta1 (p<0.01). EMD enhanced in vitro wound healing of PDL cells compared with the other treatments. Total protein synthesis was significantly increased in PDL cells cultured with EMD compared with PDL cells treated with TGF-beta1 or EMD+TGF-beta1 (p<0.05). EMD induced ALP activity in PDL fibroblasts, which was associated with an increase of bone-like nodules. CONCLUSION: These findings support the hypothesis that EMD and TGF-beta1 may play an important role in periodontal regeneration. EMD induced PDL fibroblast proliferation and migration, total protein synthesis, ALP activity, and mineralization, while TGF-beta1 increased cellular adhesion. However, the combination of both factors did not positively alter PDL fibroblast behaviour.     

Human gingival fibroblasts release high‐mobility group box‐1 protein through active and passive pathways

Introduction:  The nuclear protein high‐mobility group box‐1 (HMGB1) acts as a late mediator of inflammation when secreted in the extracellular milieu. In this study, we examined the effect of lipopolysaccharides from periodontal pathogens and apoptotic and necrotic cell death on HMGB1 production in human gingival fibroblasts (HGF). Methods:  HGF from healthy periodontal tissue were cultured and stimulated with lipopolysaccharides (LPS) from Aggregatibacter actinomycetemcomitans, Porphyromonas gingivalis, and Escherichia coli. We also initiated apoptotic and necrotic cell deaths in HGF. The HMGB1 released in the supernatants from stimulated or dying cells was measured. Immunocytochemical staining against HMGB1 was performed in LPS‐stimulated HGF. Results:  A significantly higher amount of HMGB1 was detected from necrotic and apoptotic HGF. LPS from A. actinomycetemcomitans, P. gingivalis, and E. coli significantly induced the production of HMGB1 in a time‐dependent manner. After 6 h of LPS stimulation, HMGB1 was present in the cytoplasm of cells whereas its location was mainly nuclear after 24 h. Conclusions:  LPS from two major periodontal pathogens, A. actinomycetemcomitans and P. gingivalis, induced HMGB1 secretion from HGF. Apoptotic and necrotic cell deaths resulted in the enhancement of HMGB1. Our results suggest that HGF can be a source of HMGB1 by both active secretion and passive release, and that HMGB1 from HGF may contribute to periodontal tissue destruction.     

槟榔碱对人牙周膜成纤维细胞凋亡的影响

目的 研究槟榔碱(Arecoline)对体外培养的人牙周膜成纤维细胞(human periodontal ligament fibro-blast,hPDLFs)中凋亡及相关蛋白p-JNK、p-p53、Bcl-2表达的影响.方法 采用组织块培养法培养原代hPDLFs,并传代纯化后用于实验.采用浓度为0μg/mL、20μg/mL、40μg/mL、80μg/mL的槟榔碱处理牙周膜成纤维细胞12 h,通过MTT法检测细胞增殖,流式细胞仪检测细胞凋亡,蛋白免疫印记法检测槟榔碱对hPDLFs中p-JNK、p-p53、Bcl-2表达的情况.结果 槟榔碱作用于hPDLFs后,细胞增殖受到抑制,细胞凋亡率随着药物浓度增加而增加,p-JNK、p-p53蛋白表达逐渐增强,Bcl-2蛋白表达逐渐降低,呈现浓度依赖性.结论 提示槟榔碱可通过激活JNK和p53的磷酸化水平导致hPDLFs的凋亡,对牙周组织的再生有抑制作用.     

人牙周膜成纤维细胞对米诺环素的跨膜转运

目的研究人牙周膜成纤维细胞（HPDLF）对米诺环素的跨膜转运,为通过根管局部及全身给药的假说提供实验依据。方法用米诺环素溶液孵育HPDLF和MC3T3- E1细胞,超声破碎细胞后,高效液相色谱法（HPLC）测定不同时间点的胞内药物含量,考马斯亮蓝法测定细胞蛋白总量。结果HPLC可以精确测量细胞内米诺环素的含量。细胞种类和孵育时间对细胞内米诺环素含量有显著性影响（P<0.01）,胞内米诺环素含量随着时间延长而增加,两种细胞的胞内药物含量不同;胞外米诺环素浓度增加时,细胞内药物含量增加。结论米诺环素存在HPDLF的跨膜转运,这种转运与细胞外药物浓度及孵育时间有关,并存在着细胞差异。