细胞角蛋白(CK)13在鼻腭囊肿衬里上皮中的表达及其意义

目的 研究细胞角蛋白(CK)13在鼻腭囊肿衬里上皮中变化的规律和其表达的意义.方法 对经临床和病理诊断的36例鼻腭囊肿的衬里上皮进行常规HE染色和免疫组化染色,检测CK13在鼻腭囊肿上皮中的表达.结果 CK13在鼻腭囊肿的纤毛上皮表达呈阴性;在纤毛柱状与鳞状上皮细胞的混合型上皮的中间层表达呈弱阳性;CK13在部分鳞状上皮的基底层、中间层或表层表达为阳性;鳞状上皮的全层呈强阳性.结论 在纤毛柱状上皮细胞中出现化生鳞状上皮细胞时,同时表达CK13;CK13随着纤毛柱状上皮向鳞状上皮化生程度的逐渐增强而逐渐增多;CK13可作为判断鼻腭囊肿上皮鳞状化生的标志和检测化生程度.根据纤毛柱状上皮向鳞状上皮化生过程中细胞形态的变化和CK13的表达,推测鳞状上皮细胞是由纤毛柱状上皮化生而来.     

细胞角蛋白及其mRNA在根端囊肿上皮衬里中的表达

目的本研究目的是探讨根端囊肿上皮衬里细胞角蛋白及其mRNA的表达情况.方法检测52例根端囊肿衬里上皮的细胞角蛋白(CK8,CK13和CK18)的表达,其中采用免疫组化染色法检测32例上颌根端囊肿和20例下颌根端囊肿;采用原位杂交法检测24例上颌根端囊肿和13例下颌根端囊肿CK-mRNA表达;采用逆转录聚合酶链反应(RT-PCR)法检测24例上颌囊肿.结果上颌根端囊肿中CK8,CK13,CK18阳性的鳞状上皮衬里分别是20例,29例和19例,下颌根端囊肿中表达阳性的分别为10例,20例和11例.上颌根端囊肿中[CK18( )-CK13(-)]3例,[CK18( )-CK13( )]13例,[CK18(-)-CK13( )]13例,而下颌根端囊肿中[CK18( )-CK13(-)]0例,[CK18( )-CK13( )]11例,[CK18(-)-CK13( )]9例.原位杂交显示24例上颌根端囊肿和13例下颌根端囊肿分别有9例和4例囊肿衬里中有CK18-mRNA表达.RT-PCR检测发现CK18-mRNA和CK13-mRNA在正常鼻窦粘膜和牙龈上皮(对照组)及上颌囊肿衬里都有表达.结论CK18-mRNA和CK13-mRNA在根端囊肿鳞状上皮和柱状上皮基本上都有表达.上颌根端囊肿中CK蛋白及其CK18-mRNA表达的不同,可能是囊肿上皮衬里基因型发生转变的结果.     

细胞角蛋白18和13在术后性上颌囊肿化生上皮中的表达

目的研究口腔术后性颌骨囊肿（POMC）化生上皮起源以及细胞角蛋白（CK）在鳞状化生细胞中的表达.方法采用免疫组化SP法、原位杂交法和RT-PCR法,分别检测46例POMC中细胞角蛋白的表达情况.其中13例囊肿衬里上皮只含有假复层纤毛柱状上皮细胞;30例囊肿衬里既含有纤毛柱状上皮细胞,又含化生的鳞状上皮细胞;3例囊肿衬里只含有化生的鳞状上皮细胞.结果43例纤毛柱状上皮细胞中,39例表达CK8,9例表达CK13,43例均有CK18表达.发生鳞状上皮化生的细胞中CK13表达较多,CK8和CK18表达较少.在33例发生化生的囊肿衬里中,24例表达CK8,23例表达CK13,26例表达CK18.CK13和CK18蛋白的表达与CK13、CK18-mRNA表达水平相关.原位杂交方法检测CK1g-mRNA表达时发现,26例CK18蛋白阳性的化生囊肿衬里上皮以及7例发生化生但不表达CK18蛋白的囊肿衬里上皮都有CK18-mRNA的表达.RT-PCR结果进一步证明所有发生鳞状化生的囊肿衬里上皮都有CK18-mRNA的表达,但是其表达水平较未发生化生的柱状细胞囊肿衬里上皮弱,而且CK13-mRNA的表达与CK18-mRNA表达相反.结论在发生上皮化生的全过程中,CK18-mRNA保持不变,但是其蛋白的表达水平下降,而且发生鳞状化生时CK18表达减少,CK13表达增加.     

细胞角蛋白(CK)13在含牙囊肿衬里上皮的表达

目的 研究纤毛柱状上皮向鳞状上皮化生时细胞角蛋白13的表达，探讨其表达在上皮化生方面的意义。方法 取54例含牙囊肿和6例鼻腭管囊肿，分别采用细胞角蛋白13单克隆抗体进行免疫组织化学染色、HE染色和RT-PCR方法研究细胞角蛋白13基因的表达。结果 54例含牙囊肿中，46例为复屡鳞状上皮细胞衬里，CK13均呈阳性表达；8例混合性上皮衬里，其中的鳞状上皮细胞部分CK13也呈阳性表达；纤毛柱状上皮部分和6例鼻腭管囊肿的纤毛柱状上皮细胞均呈阴性表达。RT-PCR结果显示细胞角蛋白13基因在复屡鳞状上皮中表达最强，在混合性上皮中表达减弱，在纤毛柱状上皮中表达极弱。结论 细胞角蛋白13基因（CK13-mRNA）在纤毛柱状上皮、混和性上皮和复屡鳞状上皮三种不同上皮衬里中均有表达，但表达强度不同。呈由弱到强的变化。在鳞状上皮细胞中细胞角蛋白13呈强阳性表达；在纤毛柱状上皮细胞中细胞角蛋白13呈阴性；可是，当纤毛柱状上皮中出现鳞状上皮细胞时，可见细胞角蛋白13呈阳性表达，因而，细胞角蛋白13是纤毛柱状上皮细胞向鳞状上皮细胞化生过程中的标志性产物，但是有待进一步验证。     

根侧角化囊肿的CK18及基因表达的研究

目的:对根侧角化囊肿与其它角化囊肿衬里上皮细胞角蛋白18(CK18)基因表达是否一致进行探讨。方法:1例根侧角化囊肿、2例颌骨牙源性角化囊肿和1例含牙囊肿的衬里上皮,使用CK18基因探针进行原位杂交,检测CK18 mRNA在衬里上皮细胞层的原位表达;同时进行CK18、PCNA、p53、p21、Bcl-2、Fas/Fas-L、Bax(B-9)、WAF-1、CEA的单克隆抗体免疫组织化学染色。结果:原位杂交法显示CK18 mRNA在根侧角化囊肿的表达为强阳性,其它角化囊肿衬里上皮表现为弱阳性;免疫组化染色结果显示PCNA和Bcl-2在根侧角化囊肿中表达为强阳性,在2例颌骨牙源性角化囊肿表达为弱阳性,在含牙囊肿中有表达;而p53、p21、Fas/Fas-L、CEA在病例中均为阴性表达;Bax(B-9)、WAF-1在1例角化囊肿中表达为弱阳性,在其余3例中均为阴性表达。结论:根侧角化囊肿与其他部位角化囊肿相比较,强阳性表达反映增殖能力的相关蛋白及阴性表达与凋亡有关蛋白、抑癌基因,提示根侧角化囊肿可能比其它部位角化囊肿增殖或复发的潜力更高。     

细胞角蛋白(CK)13及其基因在术后性上颌囊肿衬里上皮中的表达

目的研究CK13蛋白和CK13-mRNA在术后性上颌囊肿(post operative maxillary cysts,POMCs)衬里上皮细胞中的表达,进而探讨CK13在纤毛柱状上皮向鳞状上皮化生过程中的意义.方法本研究采用免疫组织化学染色法和RT-PCR法分别检测CK13蛋白和CK13-mRNA在32例POMCs衬里上皮中的表达.结果免疫组织化学染色显示CK13蛋白在鳞状上皮中呈阳性表达,在纤毛柱状上皮中呈阴性;RT-PCR法检测出CK13-mRNA在所有囊肿衬里上皮均呈阳性表达,其中13例纤毛柱状上皮呈弱阳性,14例既有纤毛柱状上皮又有鳞状上皮的混合上皮呈中等强度表达,5例鳞状上皮呈强阳性.结论 POMCs衬里的纤毛柱状上皮中存在CK13-mRNA,提示化生的鳞状上皮细胞可能来源于纤毛柱状上皮.在纤毛柱状上皮向鳞状上皮化生时CK13蛋白可能起着重要作用.     

细胞角蛋白18及其基因在牙源性角化囊肿衬里上皮中表达的意义

目的检测细胞角蛋白18（CK18）及其基因在牙源性角化囊肿（OKC）衬里上皮中的表达。方法选取32例OKC的衬里上皮组织,分别进行CK18、CK8和CK19单克隆抗体的免疫组织化学染色。对其中12例使用RT- PCR法检测CK18 mRNA,观察其在衬里上皮中的表达;同时使用CK18基因探针进行原位杂交,检测CK18 mRNA在衬里上皮细胞层的定位表达。结果在免疫组织化学染色中, 17例CK18蛋白在OKC衬里上皮的表层细胞层表达为弱阳性;27例CK18蛋白在棘细胞层上层染色为阳性;14例CK18蛋白在棘细胞层染色为阳性;所有标本基底细胞层染色呈阴性。RT- PCR法检测见4例CK18 mRNA表达为强阳性,8例表达为弱阳性。原位杂交法检测见8例CK18 mRNA在棘细胞层和棘细胞层上层呈阳性,4例在上皮基底细胞层和角化层呈阳性。CK8蛋白在所有32例OKC衬里上皮基底细胞层均有表达。CK19蛋白在23例OKC衬里上皮表层均有表达。结论CK18在OKC衬里上皮的表达由基底细胞层向棘细胞层迁移,CK18蛋白免疫组织化学染色阳性表达与CK18 mRNA原位杂交法阳性表达不同,提示CK18可能与衬里上皮的增殖活性有关,OKC衬里上皮中可能存在CK18蛋白和CK18 mRNA表达的调控因子。     

MTA用于根端囊肿根尖倒充填的临床评价

目的:观察根端囊肿术中应用MTA根尖倒充填的临床疗效。方法:临床确诊为根端囊肿病例共30例,病灶牙均为上颌前牙,术前常规根管治疗并超充填牙胶尖,术中刮除囊壁后去除病灶牙根尖3 mm,最后应用MTA根尖倒充填并封闭根尖孔区。结果:30例患牙均取得成功,术后3年无复发,且病灶牙与颌骨均愈合良好。结论:根端囊肿术中应用MTA根尖倒充填取得较好的临床疗效,且操作方便,无不良刺激反应,是一种较理想的治疗方法。     

细胞角蛋白18、19在口腔鳞状细胞癌侵袭转移中表达的研究进展

<正>口腔癌占全身恶性肿瘤的3%～5%,其中以口腔鳞状细胞癌(oral squamous cell carcinoma,OSCC)最常见,其复发和转移是影响预后的重要因素。随着研究技术的发展和对微转移的深入研究表明,及时发     

腺牙源性囊肿两例报告及其细胞角蛋白18的表达

目的探讨腺牙源性囊肿衬里上皮的组织学特征及其细胞角蛋白18、19、CK18-mRNA的表达和该囊肿的组织来源。方法对2例腺牙源性囊肿采用常规HE切片、免疫组织化学染色和原位杂交的方法分别进行组织学观察，检测CK18、CK19和CK18-mRNA的表达。结果囊壁内有微小子囊存在，子囊周围有黏液细胞为主的混合性腺体结构。CK18在囊肿衬里上皮呈阳性表达；在子囊的衬里上皮CK18呈阴性，而CK19呈阳性表达；腺体结构中CK18和CK19均呈阳性表达。在原位杂交中CK18-mRNA在所有上皮中均呈不同程度的阳性表达。结论CK18-mRNA及其蛋白的表达差异可能与囊肿上皮细胞的分化有关，腺牙源性囊肿的角蛋白表达谱存在牙源性上皮和腺源性上皮的交叉，可能同时存在牙源性和腺源性分化。     

Prevalence of Ciliated Epithelium in Apical Periodontitis Lesions

Introduction

This article reports on the morphologic features and the frequency of ciliated epithelium in apical cysts and discusses its origin.

Methods

The study material consisted of 167 human apical periodontitis lesions obtained consecutively from patients presenting for treatment during a period of 12 years in a dental practice operated by one of the authors. All of the lesions were obtained still attached to the root apices of teeth with untreated (93 lesions) or treated canals (74 lesions). The former were obtained by extraction and the latter by extraction or apical surgery. Specimens were processed for histopathologic and histobacteriologic analyses. Lesions were classified, and the type of epithelium, if present, was recorded.

Results

Of the lesions analyzed, 49 (29%) were diagnosed as cysts. Of these, 26 (53%) were found in untreated teeth, and 23 (47%) related to root canal–treated teeth. Ciliated columnar epithelium was observed partially or completely lining the cyst wall in 4 cysts, and all of them occurred in untreated maxillary molars. Three of these lesions were categorized as pocket cysts, and the other was a true cyst.

Conclusions

Ciliated columnar epithelium-lined cysts corresponded to approximately 2% of the apical periodontitis lesions and 8% of the cysts of endodontic origin in the population studied. This epithelium is highly likely to have a sinus origin in the majority of cases. However, the possibility of prosoplasia or upgraded differentiation into ciliated epithelium from the typical cystic lining squamous epithelium may also be considered.     

Cytokeratin expression patterns for distinction of odontogenic keratocysts from dentigerous and radicular cysts

BACKGROUND: The clinical outcome of treatment of odontogenic cysts differs depending on separate entities. Particular clinical relevance must be attached to the distinction between odontogenic keratocysts, which have an evident tendency to recur, and other odontogenic cysts. The aim of this study was to evaluate cytokeratin (CK) expression patterns as an additional tool for characterization of different cysts as the histomorphologic appearance often is not decisive. METHODS: Thirty cases of dentigerous and radicular cysts respectively as well as 15 cases of odontogenic keratocysts were considered. Expression of CK 5/6, 7, 10, 13, 17, 19 and 20 was determined in addition to Ki-67 immunohistochemically. RESULTS: Expression of CK 17 was discernible in 93.3% of the odontogenic keratocysts, but only in 35.0% of dentigerous and radicular cysts under study (P < 0.001). CK 19 could be detected in 48.3% of dentigerous and radicular cysts, whereas odontogenic keratocysts were completely negative (P < 0.002). CONCLUSION: Immunohistochemical detection of CK 17 and 19 seems to be a valuable additional parameter distinguishing between odontogenic keratocysts and other odontogenic--especially dentigerous--cysts which clinically are likely the most significant differential diagnoses in this context. J Oral Pathol Med (2005) 34: 558-64.     

Cytokeratin expression patterns in jaw cyst linings with metaplastic epithelium

BACKGROUND: Cytokeratin (CK) expression patterns have been studied in numerous intact and diseased oral tissues. However, CK expression in metaplastic squamous cells has not been explored in depth and the origin of metaplastic epithelial linings of the jaw cysts has not been sufficiently investigated. METHODS: We examined CK expression in 46 postoperative maxillary cysts (POMCs) which were lined with pseudostratified columnar cells only, columnar and squamous cells, and squamous cells only, in 13, 30 and 3 cases, respectively. RESULTS: The expression of CK8, CK13 and CK18 were observed in 39, 9 and all 43 of the columnar epithelial linings, respectively. Metaplastic squamous epithelia expressed more CK13, and less CK18 and CK8. Of the 33 metaplastic linings, 24 expressed CK8, 23 CK13 and 26 linings expressed CK18. The patterns of expression of CK13 and CK18 observed were CK18(+)-CK13(-) in 10 metaplastic linings, CK18(+)-CK13(+) in 16, and CK18(-)-CK13(+) in 7. The expression of CK13- and CK18-mRNA was generally correlated with level of protein expressed. CK18-mRNA expression was observed by in situ hybridization, not only in the 26 metaplastic linings which were positive for CK18 protein, but also in five of the seven metaplastic linings which did not express CK18 protein. In addition, RT-PCR revealed an expression of CK18-mRNA in all metaplastic squamous linings, although the expression level was weaker than that in the columnar epithelial linings. The CK13-mRNA was expressed inversely to the CK18-mRNA. CONCLUSIONS: These results indicate that CK18-mRNA is preserved through metaplasia, although the protein expression decreased. Metaplastic squamous cells differentiate with a decrease of CK18 and an increase of CK13 expression.     

Immunoexpression of Transforming Growth Factor Beta and Interferon Gamma in Radicular and Dentigerous Cysts

Introduction

The aim of this study was to evaluate and compare the immunohistochemical expression of transforming growing factor beta (TGF-β) and interferon gamma (IFN-γ) between radicular cysts (RCs) and dentigerous cysts (DCs).

Methods

Twenty RCs and DCs were selected for analysis of the immunoexpression of TGF-β and IFN-γ in the epithelium and capsule.

Results

The cell reactivity of TGF-β and IFN-γ in the lining epithelium and capsule of RCs showed no significant differences when compared with DCs (P > .05). There was a tendency of a higher expression of TGF-β in the capsule of DCs.

Conclusions

Our results showed the presence of TGF-β and IFN-γ in RCs and DCs, supporting the hypothesis that both participate in the development of these lesions, where IFN-γ usually plays a role in bone resorption, which is counterbalanced by the osteoprotective activity performed by TGF-β.     

Expression of keratins 8, 18, and 19 in epithelia of atrophic oral lichen planus

Keratins form intermediate filaments of the cytoskeleton in keratinocytes and have roles in cell structure, signaling, intracellular transport, and cell death. Oral lichen planus (OLP) is an oral inflammatory disease with derangements in basal keratinocytes and disruption of the basal membrane. Here, we focused on epithelial expression of keratins 8, 18, and 19 because these proteins are known to modulate cell death. Biopsies were taken from buccal oral mucosa of persons with normal oral mucosa (n = 10) or atrophic OLP (n = 10). Cultured normal oral keratinocytes (n = 4) showed expression of mRNA and protein for keratins 8, 18, and 19. Immunohistochemistry showed consistent staining for keratins 8 and 18 in basal keratinocytes of normal oral mucosa. In OLP, staining for keratin (K)8 was mostly negative and staining for K18 was weak. Keratin 19 was expressed irregularly in most biopsies of normal oral mucosa and not at all in OLP. Several mononuclear leukocytes in the cellular infiltrate showed membrane staining for K8 and K18. Positive staining for K16 confirmed partial collapse of the basal cell layer in OLP. The basal cell niche in OLP therefore appeared to be partly populated with keratinocytes demonstrating a higher degree of differentiation (K8⁻ K18⁻ K19⁻ K16⁺); consequently, such areas may be more susceptible to the action of cell death factors released from the cell infiltrate as a result of lacking the protective, normal keratin present in the basal epithelial cell layer of normal oral mucosa.     

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目的探讨龈沟液中白介素-18（IL-18）和基质金属蛋白酶-13（MMP-13）表达与种植体周围炎的关系,评价其作为种植体周围炎诊断客观指标的意义。方法选择2011年5月至2013年5月在佳木斯大学口腔医学院口腔种植科行ITI种植体种植的患者30例作为研究对象（种植体40颗）,根据种植体周围情况将其分为健康种植体组（28颗）和炎症种植体组（12颗）：将对侧同名健康天然牙作为对照（健康天然牙组,40颗）。分别检测各组的牙周探诊深度（PD）、出血指数（SBI）、龈沟液（GCF）量及GCF中的IL-18、MMP-13含量并进行分析。结果炎症种植体组的PD、SBI值显著高于健康种植体组和健康天然牙组,差异有统计学意义（P〈0．05）。炎症种植体组的GCF量以及GCF中IL-18和MMP-13含量均高于健康种植体组和健康天然牙组,差异有统计学意义（P〈0．05）。健康种植体组与健康天然牙组比较,两组的PD、SBI、GCF量以及GCF中IL—18和MMP-13含量的差异均无统计学意义（P〉0．05）。结论IL-18和MMP-13与种植体周围炎有密切关系,可作为种植体周围炎早期诊断的有效检测指标。