Correlation and Expression of COX-2 and P53 Protein in Basal Cell Carcinoma of Eyelid

The correlation between the expression of COX-2 and p53 protein in basal cell carcinoma （BCC） of eyelid and apoptosis was investigated. Specimens of BCC were collected from 40 cases （aged 28-68 y） at the Department of Pathology, Renmin Hospital of Wuhan University, and Department of Pathology, Zhongnan Hospital of Wuhan University during from 1999 to 2006. Five specimens of paracancerous tissues served as control group. Immunohistochemical staining was performed to detect the expression of COX-2 and p53 in the tissues. The average absorbance （A） and the average positive area rate of COX-2 and p53 protein were measured by image analysis. The positive area rate of COX-2 and p53 protein was analyzed by linear correlation analysis. It was found that COX-2 and p53 proteins were highly expressed in BCC of eyelid, and weakly expressed in paracancerous tissues. Image analysis revealed that the expression of COX-2 and p53 proteins in BCC of eyelid was sig- nificantly higher than that in paracancerous tissues （P〈0.01）. Spearman rank correlation analysis demonstrated a positive correlation between the expression of COX-2 and p53 （r=0.113, P=0.421）. It was concluded that COX-2 can increase the expression of p53 protein, therefore suppressing apoptosis.

Involvement of ERK1/2 and p38 MAPK in up-regulation of 14-3-3 protein induced by hydrogen peroxide preconditioning in PC12 cells

Objective To investigate the protective effects of hydrogen peroxide preconditioning （HPP） on the pheochromocytoma （PC12） cells treated with 1-methyl-4-phenylpyridinium （MPP^＋） and to explore the potential mechanisms. Methods The viability and apoptosis of PC 12 cells were determinded by 3-（4,5-dimethylthiazol-2-yl）-2,5-diphenyltetrazolium bromide （MTT） assay and 4′,6′-diamidino-2-phenylindole （DAPI） staining, respectively. The expressions of 14-3-3 protein and phospholylated p38 mitogen-activated protein kinase （MAPK） were determined by Western blot. Enzyme-linked immunosorbent assay （ELISA） was used to measure the activity of extracellular signal-regulated protein kinase 1/2 （ERK1/2）. Results The cell viability decreased and the number of apoptotic cells increased dramatically in MPP^＋ group compared with that in Control group. HPP induced a significant increase in cell viability and a marked decrease in population of apoptotic cells of the MPP^＋- treated PC 12 cells, accompanied with up-regulation of 14-3-3 protein and increase of ERK 1/2 and p38 MAPK activities. The 14-3-3 protein expression was positively correlated with the phosphorylation of ERK1/2. Furthermore, inhibition of the ERK1/2 with PD98059 abolished the 14-3-3 protein up-regulation in PC 12 cells induced by HPP. Conclusion HPP protects PC 12 cells against MPP＋ toxicity by up-regulating 14-3-3 protein expression through the ERK1/2 and p38 MAPK signaling pathways.

EXPRESSIONS OF P_(53), PROLIFERATING CELL NUCLEAR ANITIGEN,BCL-2 PROTEIN AND THEIR SIGNIFICANCE IN SALIVARY ADENOID CYSTIC CARCINOMA

Objective To study the effects of P53, PCNA, Bc1-2 protein and their relationship in salivary adenoid cystic carclnoma(SACC). Methods These protelns were examlned by lmmunohistochemistry. Results overexpressions of Ps, and PCNA were revealed in ACC samples, they were higher than those in (polymorphous adenomas) PA, but expression of Bc1-2 protein was not different between ACC and PA. In 3 subtypes of ACC, expressions of 3 proteins were different. Conciusion Mutations of P53, Bc1-2 may be involed in the occurrence of SACC, expression of PCNA and mutation of P53 may coexist in the development of the SACC.

Rice leaf inclination2, a VIN3-1ike protein, regulates leaf angle through modulating cell division of the collar

As an important agronomic trait, inclination of leaves is crucial Ior crop architecture and grain yields. 10 understand the molecular mechanism controlling rice leaf angles, one rice leaf inclination2 （1c2, three alleles） mutant was identified and functionally characterized. Compared to wild-type plants, lc2 mutants have enlarged leaf angles due to increased cell division in the adaxial epidermis of lamina joint. The LC2 gene was isolated through positional cloning, and encodes a vernalization insensitive 3-like protein. Complementary expression of LC2 reversed the enlarged leaf angles of lc2 plants, confirming its role in controlling leaf inclination. LC2 is mainly expressed in the lamina joint during leaf development, and particularly, is induced by the phytohormones abscisic acid, gibberellic acid, auxin, and brassinosteroids. LC2 is localized in the nucleus and defects of LC2 result in altered expression of cell division and hormone-responsive genes, indicating an important role of LC2 in regulating leaf inclination and mediating hormone effects.

Development of a Rapid Multi-residue Assay for Detecting β-lactams Using Penicillin Binding Protein 2x

Objective To develop a rapid multi-residue assay for detecting 16 demanded by the European Union （EU）. Methods A recombinant penicillin-binding protein （PBP） 2x＊ from Streptococcus pneumoniae R6 was expressed in vitro and six β-1actams were conjugated to HRP by four methods. A rapid multi-residue assay for β-1actams was established with PBP2x＊ and HRP-conjugate. Results PBP2x＊ was expressed and purified successfully and the ideal HRP-conjugate was identified. The multi-residue assay was developed. After optimization, penicillin G, ampicillin, amoxicillin, cloxacillin, dicloxacillin, oxacillin, nafcillin, cephalexin, ceftiofur, cefalonium, cefquinome, cefazolin, cefoperazone, cephacetrile, and cephapirin can be detected at levels below MRL in milk with simple pretreatment. Conclusion This assay developed can detect all 16 β-1actams demanded by the European Union （EU）. The whole procedure takes only 45 min and can detect 42 samples and the standards with duplicate analysis.

Inhibition of DNA-dependent Protein Kinase Catalytic Subunit by Small Molecule Inhibitor NU7026 Sensitizes Human Leukemic K562 Cells to Benzene Metabolite-induced Apoptosis

Benzene is an established leukotoxin and leukemogen in humans. We have previously re- ported that exposure of workers to benzene and to benzene metabolite hydroquinone in cultured cells induced DNA-dependent protein kinase catalytic subunit （DNA-PKcs） to mediate the cellular response to DNA double strand break （DSB） caused by DNA-damaging metabolites. In this study, we used a new, small molecule, a selective inhibitor of DNA-PKcs, 2-（morpholin-4-yl）-benzo[h]chomen-4-one （NU7026）, as a probe to analyze the molecular events and pathways in hydroquinone-induced DNA DSB repair and apoptosis. Inhibition of DNA-PKcs by NU7026 markedly potentiated the apoptotic and growth inhibitory effects of hydroquinone in proerythroid leukemic K562 cells in a dose-dependent manner. Treatment with NU7026 did not alter the production of reactive oxygen species and oxidative stress by hydroquinone but repressed the protein level of DNA-PKcs and blocked the induction of the kinase mRNA and protein expression by hydroquinone. Moreover, hydroquinone increased the phos- phorylation of Akt to activate Akt, whereas co-treatment with NU7026 prevented the activation of Akt by hydroquinone. Lastly, hydroquinone and NU7026 exhibited synergistic effects on promoting apop- tosis by increasing the protein levels of pro-apoptotic proteins Bax and caspase-3 but decreasing the protein expression of anti-apoptotic protein Bcl-2. Taken together, the findings reveal a central role of DNA-PKcs in hydroquinone-induced hematotoxicity in which it coordinates DNA DSB repair, cell cycle progression, and apoptosis to regulate the response to hydroquinone-induced DNA damage.

Polymorphism of heat shock protein 70-2 and enterocutaneous fistula in Chinese population

AIM: To investigate whether the heat shock protein 70-2 (HSP70-2) polymorphism is associated with enterocutaneous fistulas in a Chinese population.

A retrospective investigation on the phenotype and stability of the E-protein gene in Japanese Encephalitis (JE) virus strain SA14-14-2 used live-attenuated JE vaccine

To detect retrospectively the phenotype and stability of the E-protein gene in Japanese Encephalitis （JE） virus strain SA14-14-2 used in the live-attenuated JE vaccine prepears, the viral titer was titrated by plaque formation in BHK-21 cell cultures, and the neuro-virulence of viruses was assayed in mice with body weight of 12-14 g by intracerebral inoculation. Meanwhile, the total RNA of virus gene was extracted and amplified by RT-PCR with the designed primers, and then it was purified and cloned to the expression vector pGEM-T. The recombinant plasmid was purified and sequenced. It was found that the loss of viral titer of vaccines stored in -20℃ for longer than 10 years was less than 0.5 Lg PFU/ml. No mice inoculated intracerebrally showed signs of illness or even death. The size of plagues of the vaccine virus remained to be small, and the E genes of primary virus seed SA14-14-2 and the vaccines prepared at different years （1987-2001） were unchanged, in- cluding the 8 critical amino acid sites which were different from the parent wild virus strain SA14 and the related neuro-virulence. These results indicate that the genotypic and biological characteristics of the attenuated JE virus strain SA14-14-2 and its vaccines sion noted. prepared are quite stable without any reversion noted.

lincRNA Cox2通过miR-129-5p/AMPK调控BCG感染的巨噬细胞糖酵解进程

[目的]探究lincRNA Cox2对BCG(Bacillus Calmette-Guérin)感染的RAW264.7巨噬细胞糖酵解进程的调控作用,阐明Mtb与巨噬细胞之间的相互作用,为结核病的诊断和治疗提供新的靶点。[方法]利用小干扰RNA敲减lincRNA Cox2的表达,以及使用miR-129-5p mimics过表达载体,结合BCG感染,通过实时荧光定量PCR检测lincRNA Cox2、miR-129-5p和促炎因子IL-1β、TNF-α、IL-6的表达量;乳酸含量检测试剂盒检测乳酸(LD)的分泌情况;平板涂布法检测巨噬细胞菌载量情况;双荧光素酶报告基因系统验证lincRNA Cox2与miR-129-5p以及miR-129-5p与AMPK的互作关系;蛋白免疫印迹检测AMPK(AMP依赖蛋白激酶)及糖酵解途径中关键基因HK1(己糖激酶1)、PKM2(丙酮酸激酶2)和LDHA(乳酸脱氢酶)的表达变化。[结果]BCG感染12 h能够极显著上调RAW264.7巨噬细胞中lincRNA Cox2的表达(P=0.000013),与BCG组相比,siRNA+BCG组中AMPK(P=0.000771)、HK1(P=0.00323)、PKM2(P=0.000135)和LDHA(P=0.002532)的表达量以及乳酸的分泌量(P=0.020802)发生显著上调,而促炎因子IL-1β(P=0.000451)、TNF-α(P=0.000147)、IL-6(P=0.0001)的表达发生显著下调,菌载量试验表明siRNA+BCG组中的巨噬细胞菌载量显著下调(P=0.000127)。双荧光素酶报告基因系统表明lincRNA Cox2和miR-129-5p存在相互作用关系并以AMPK为靶基因。BCG感染RAW264.7巨噬细胞12 h后极显著下调miR-129-5p的表达(P=0.000156),与BCG组相比,miR-129-5p mimics+BCG组中AMPK(P=0.000262)、HK1(P=0.019524)、PKM2(P=0.001658)和LDHA(P=0.000887)表达量以及乳酸分泌量(P=0.044952)发生显著下调。[结论]lincRNA Cox2通过海绵吸附miR-129-5p并靶向AMPK,促进BCG感染的RAW264.7巨噬细胞糖酵解进程。

Oncoprotein expression and inhibition of apoptosis during colorectal tumorigenesis

AIMS To study bcl-2 and P53 protein expression and inhibition of apoptosis during colorectal tumorigenesis. METHODS Expression of bcl -2 and p53 in 45 colorectal ade- nomas and 61 colorectal carcinomas was detected by immunohis- tochemical staining. RESULTS The bcl-2 and P53 protein expression was uniformly negative in normal mucosa,whereas bcl-2 and p53 positive rates were significantly higher in adenoma and carcinoma than in nor- reals(P<0.01 ).The area with strong bcl-2 expression was of- ten the area with severely dysplasia.In colorectal adenoma,ex- pression of p53 increased with the increasing size and dysplasia, in adenomas≥20 mm being higher than adenomas<10 mm(77, 8% vs 35.0%,P<0.05).p53 was relevant to differentiation and Duke's staging.A significant inverse correlation was found between bcl-2 and p53 in immunostaining in the adenomas,but not in the carcinomas.Furthermore,carcinomas with a high per- centage of bcl-2 positive cells were significantly more likely to have low rates of apoptosis. CONCLUSIONS These results suggest that bcl-2 gene appears to be an early event in colorectal tumorigenesis that can inhibit apoptosis,p53 expression plays an important role in the develop- ment and malignant change of colorectal adenoma,bcl-2 and p53 may be used as a good marker relating to cell apoptosis.

The Experimental and Clinical Study on the Effect of Curcumin on Cell Cycle Proteins and Regulating Proteins of Apoptosis in Acute Myelogenous Leukemia

To investigate whether the Bcl- 2 gene family is involved in m odulating mechanism of apoptosis and change of cell cycle protein induced by curcumin in acute myeloid leukemia HL - 6 0 cell line and primary acute m yelogenous leukem ic cells,the Bcl- 2 family member Mcl- 1,Bax and Bak and cell cycle proteins including P2 7kipl,P2 1wafl,cyclin D3and p Rbp- were selected and their ex- pression detected by SABC imm uno- histochem ical stain m ethod.The attitude of sub- G1 peak in DNA histogram was determined by FCM.The TU NEL positive cell percentage was identified by term inal deoxynucleotidyl transferase (Td T ) - m ediated Biotin d U NP end labeling technique.It was found that when HL - 6 0 cells were treated with 2 5μm ol/ L curcumin for 2 4 h,the expression level of Mcl- 1was down- regulated,but that of Bax and Bak up- regulated time- dependently.There was significant difference in the expression level of Mcl- 1,Bax and Bak between the curcumin- treated groups and control group(P<0 .0 5 - 0 .0 1) .At the sam e time,curcumin had no effect on progress of cell cycle in prim aty acute m yelogenous leukemia at newly diagnosis,but could in- crease the peak of Sub- G1 (P<0 .0 5 ) ,and down- regulate the expression of Mcl- 1and up- regulate the expression of Bax and Bak with the difference being statistically significant.The expression of P2 7kipl,P2 1wafl and p Rbp- were elevated and thatof cyclin D3decreased in the presence of curcum in. These findings suggested thatthe Bcl- 2 gene fam ily indeed participated in the regulatory process of apoptosis induced by curcumin in HL - 6 0 cells and AML cells.Curcumin can induce apoptosis of primary acute myelogenous leukemic cells and disturb cell cycle progression of HL - 6 0 cells.The m echanism appeared to be m ediated by perturbing G0 / G1 phases checkpoints which associated with up- regulation of P2 7kipl,P2 1wafl and p Rbp- expression,and down- regulation of cyclin D3.

穴位刺激联合COX-2抑制剂对乳腺癌骨转移大鼠镇痛、NK细胞活性及PK2蛋白水平的影响

目的:探究穴位刺激联合COX-2抑制剂对乳腺癌骨转移大鼠镇痛、NK细胞活性及PK2蛋白的作用机制。方法:选取50只SPF级SD雌性大鼠,随机数字表法分为正常(A)组、模型(B)组、穴位刺激(C)组、COX-2抑制剂(D)组与穴位刺激联合COX-2抑制剂(E)组,每组10只,对B、C、D与E组采用胫骨内注射乳腺癌细胞建立乳腺癌骨转移模型,A组不建立该模型,建模成功后,对C组给予穴位刺激治疗,对D组给予灌胃25 mg/kg的塞来昔布,对E组给予穴位刺激联合塞来昔布治疗,A组、B组同期给予灌胃同体积生理盐水,观察并记录大鼠疼痛情况,双能线骨密度仪检测大鼠骨密度及骨矿物质含量,HE染色法检测骨组织病理形态,免疫印迹法检测NK细胞活性,免疫组化法检测PK2蛋白表达。结果:与A组比较,B组50%PWT、TWL显著降低,差异具有统计学意义(P<0.05),双侧后肢负重差值显著升高,差异具有统计学意义(P<0.05),与B组比较,C组、D组与E组50%PWT、TWL明显升高,差异具有统计学意义(P<0.05),双侧后肢负重差值显著降低,差异具有统计学意义(P<0.05),且D组与C组比较差异无统计学意义(P>0.05),E组比D组变化明显,差异具有统计学意义(P<0.05);A组大鼠骨组织形态完整,骨小梁排列整齐,骨皮质连续,无坏死区域,骨髓腔内充满深染的血细胞,B组骨组织形态遭到破坏,骨皮质出现连续性中断,并可见大量肿瘤细胞浸润,瘤细胞形态不规则,且排列紊乱,细胞核大,异型性明显,与B组比较,C组、D组与E组病理形态明显改善;与A组比较,B组BMD、BMC显著降低,差异具有统计学意义(P<0.05),与B组比较,C组、D组、E组BMD、BMC显著升高,差异具有统计学意义(P<0.05),且D组与C组比较差异无统计学意义(P>0.05),E组比D组升高显著,差异具有统计学意义(P<0.05);与A组比较,B组大鼠胫骨组织中NKp30、NKp44、NKp46蛋白表达显著降低,差异具有统计学意义(P<0.05),与B组比较,C组、D组与E组大鼠胫骨组织中NKp30、NKp44及NKp46蛋白表达显著升高,差异具有统计学意义(P<0.05),且D组与C组比较差异无统计学意义(P>0.05),E组比D组升高显著,差异具有统计学意义(P<0.05);与A组比较,B组大鼠胫骨组织中PK2蛋白表达显著降低,差异具有统计学意义(P<0.05),与B组比较,C组、D组与E组大鼠胫骨组织中PK2蛋白表达显著升高,差异具有统计学意义(P<0.05),且D组与C组比较差异无统计学意义(P>0.05),E组比D组升高显著,差异具有统计学意义(P<0.05)。结论:穴位刺激联合COX-2抑制剂对乳腺癌骨转移大鼠具有显著的镇痛作用,并可显著改善NK细胞活性,促进PK2蛋白表达。

基于NF-κB iNOS-COX-2信号通路探究瑞芬太尼对脑缺血再灌注损伤大鼠神经功能的作用机制

目的研究基于核转录因子(NF)-κB-一氧化氮合酶(iNOS)-环氧合酶(COX)-2信号通路探究瑞芬太尼对脑缺血再灌注损伤大鼠神经功能的作用机制。方法选取清洁及健康雄性大鼠32只,8只为空白组,剩余24只建立脑缺血再灌注损伤模型,分为模型组、低、高剂量瑞芬太尼组各8只。采用Longa 5级神经功能缺损评分,评估神经功能损伤评分;酶联免疫吸附试验检测iNOS;采用色谱柱检测脑组织单胺类神经递质含量甲肾上腺素(NE)、多巴胺(DA)、5-羟色胺(HT);采用Western印迹检测NF-κB、iNOS、COX-2。结果与模型组相比,低、高剂量瑞芬太尼组神经功能损伤明显降低,神经递质NE、DA含量明显降低,5-HT明显升高,NO水平明显降低,iNOS、COX-2、NF-κB蛋白表达明显降低(均P<0.05)。结论瑞芬太尼通过调控NF-κB-iNOS-COX-2信号通路蛋白水平,改善大鼠脑缺血再灌注损伤的神经功能。

苗药吉祥草含药血清对气道平滑肌细胞增殖及IL-1β/COX-2信号通路的作用机制

目的 探究苗药吉祥草血清对气道平滑肌细胞增殖及白细胞介素(IL)-1β/环氧合酶(COX)-2信号通路的作用机制。方法 制备苗药吉祥草含药血清,分离并鉴定气道平滑肌细胞,把细胞分为空白组、低剂量组、中剂量组和高剂量组。CCK-8检测细胞的增殖能力;流式细胞仪检测细胞的凋亡情况;酶联免疫吸附试验(ELISA)检测细胞培养上清液中IL-1β和COX-2的含量;Western印迹检测细胞中IL-1β和COX-2蛋白表达。结果 鉴定发现本实验所分离培养的细胞为ASMCs。与空白组相比,低剂量组、中剂量组和高剂量组细胞在48和72 h时ASMCs细胞增殖能力、IL-1β和COX-2明显降低,凋亡率显著增加,且呈剂量依赖性(P<0.05)。结论 苗药吉祥草血清可抑制气道平滑肌细胞增殖,促进其凋亡;对细胞中炎性因子IL-1β和COX-2表达也能进行有效的抑制。

食管癌中COX-2表达与其临床病理特征及预后的关系

目的:检测COX-2在食管癌中的表达,探讨其与食管癌临床病理特征及术后患者预后的关系。方法:应用SABC免疫组化染色法检测89例手术切除的食管癌组织和20例正常食管粘膜组织COX-2蛋白的表达,分析COX-2在食管癌组织的表达与患者性别、年龄、肿瘤部位、病变长度、浸润深度、区域淋巴结转移、远处转移、鳞癌分化程度的关系。并对其中81例有随访资料者,分析COX-2表达与预后的关系。结果:食管癌组COX-2呈阳性表达率为94.38%(84/89),且着色较深,正常食管组COX-2呈阳性表达率为60%(12/20),着色浅。食管癌中,随着肿瘤浸润深度的增加、鳞癌细胞分化程度的减低,COX-2的表达逐步增强(P<0.05)。COX-2的表达与其它临床病理特征,包括性别、年龄、肿瘤生长部位、肿瘤大小、有无区域淋巴结转移、有无远处转移无相关(P>0.05)。COX-2低表达组与高表达组的生存时间有显著差异,前者生存时间较后者为长(P<0.01)。结论:COX-2在食管癌中的表达高于正常食管粘膜。肿瘤浸润越深、鳞癌分化程度越低,COX-2的表达越强;COX-2的表达与食管癌患者的年龄、性别、肿瘤生长部位、肿瘤长度、有无区域淋巴结转移、有无远处转移均无关。COX-2的表达与食管癌术后患者的预后相关,COX-2呈低表达者的生存时间比COX-2高表达者长。

宫颈癌中COX-2与p53、E-cadherin蛋白表达的关系

目的 探讨宫颈癌组织中环氧合酶 2 (COX 2 )的表达与 p5 3、E cadherin蛋白表达的关系。 方法 采用免疫组织化学S P法检测 4 1例宫颈癌和 10例正常宫颈上皮组织中COX 2、p5 3、E cadherin蛋白的表达水平。结果 宫颈癌组织中COX 2、p5 3表达水平明显高于正常宫颈上皮 (P <0 .0 1) ,而E cadherin蛋白的表达水平明显低于正常宫颈上皮 (P <0 .0 1) ;COX 2的高表达与宫颈癌淋巴结转移和浸润深度有关 (P <0 .0 5 ) ,与患者年龄、临床分期、组织学类型、分化程度无关 (P >0 0 5 ) ;COX 2表达阳性组 p5 3的表达水平明显高于COX 2表达阴性组 (P <0 0 5 ) ,COX 2表达阳性组的E cadherin蛋白的表达水平则低于相对应阴性组 ,差异有显著性 (P <0 0 5 )。结论 在宫颈癌的发生发展中COX 2、p5 3、E cadherin可能起重要作用。COX 2通过使抑癌基因p5 3失活 ,降低细胞黏附分子E cadherin的水平促进宫颈癌的发生。

非小细胞肺癌survivin、p53和COX-2蛋白的表达

目的探讨非小细胞肺癌组织中survivin、p53和环氧合酶-2(COX-2)蛋白表达及其在肺癌发生、分化程度、淋巴结转移以及预后评估中的意义。方法采用SP法免疫组化技术检测70例非小细胞肺癌组织中的survivin、p53和COX-2表达情况。结果survivin和COX-2阳性表达与肺非小细胞癌组织的分化程度、有无淋巴结转移及临床TNM分期有关(P<0.01);p53阳性表达与非小细胞肺癌组织的分化程度有关(P<0.01)。同时发现,survivin、p53和COX-2(■～■)阳性表达率明显高于(+～■),差异有显著性(P<0.01)。这3种抗体中在非小细胞肺癌中的阳性表达占76%。结论survivin、p53和COX-2的表达在非小细胞肺癌组织的浸润、转移和发展中具有重要意义,有助于对非小细胞肺癌的诊断及预后的评价。

PINCH蛋白和COX-2蛋白在子宫内膜癌中的表达及临床意义

目的探讨PINCH蛋白和环氧化酶-2(COX-2)蛋白在子宫内膜癌中的表达及其临床意义。方法采用免疫组化ABC法检测23例正常子宫内膜、18例不典型增生子宫内膜和50例子宫内膜癌中PINCH蛋白和COX-2蛋白的表达,并分析其临床意义。结果 PINCH蛋白在正常子宫内膜、不典型增生子宫内膜和子宫内膜癌间质中的阳性表达率分别为17.4%、38.8%、72.0%,呈现逐渐增高的趋势,差异有统计学意义(P<0.05);COX-2蛋白在正常子宫内膜、不典型增生子宫内膜和子宫内膜癌上皮中的阳性表达率分别为26.1%、61.1%、80.0%,呈现逐渐增高的趋势,差异有统计学意义(P<0.05)。PINCH蛋白及COX-2蛋白阳性表达率与子宫内膜癌的分期、淋巴结转移、组织学类型、肌层浸润深度、病理分级等无明显相关性(P>0.05),PINCH蛋白的表达与雌激素作用时间有关(P<0.05)。PINCH蛋白与COX-2蛋白的表达呈正相关(r=0.468,P<0.05)。结论 PINCH、COX-2与子宫内膜癌的发生相关,在子宫内膜癌中二者表达有明显相关性,为肿瘤基因治疗提供新的靶点。

EGFR、COX-2及p63蛋白表达与甲状腺乳头状癌侵袭转移的关系

目的 探讨甲状腺乳头状癌 (PTC)中表皮生长因子受体 (EGFR)、环氧化酶 2 (COX 2 )和 p6 3蛋白的表达与肿瘤侵袭转移的关系。方法 采用免疫组化S P法检测 6 7例PTC(其中腺内侵袭 4 1例、腺外侵袭 2 6例 ;有淋巴结转移 2 9例、无淋巴结转移 38例 )、3例滤泡癌和 15例甲状腺腺瘤中EGFR、COX 2及 p6 3蛋白的表达。结果 EGFR、COX 2和 p6 3蛋白在PTC组织中的阳性表达率分别为 88 1%、82 1%和 70 2 % ,均显著高于甲状腺腺瘤 (P <0 0 5 ) ;EGFR与COX 2、COX 2与p6 3蛋白在PTC组织中的的表达呈明显正相关 (P <0 0 5 ) ;EGFR和COX 2在PTC腺外侵袭组和有淋巴结转移组阳性表达率均明显高于腺内侵袭组和无淋巴结转移组 (P <0 0 5 ) ,p6 3蛋白阳性表达率与淋巴结转移有关 (P <0 0 5 )、与浸润程度无关。结论 EGFR与COX 2在PTC组织中的高表达可能促进肿瘤的侵袭和转移 ,p6

COX-2的基因克隆和多克隆抗体制备

环氧合酶 2 (COX 2 )是一种具有多种功能的神经调节物质 ,它的许多功能细节仍不十分清楚 ,还需要进一步深入研究 .用PCR技术从大鼠脑cDNA文库中 ,扩增到正常成年大鼠COX 2的cDNA序列 ,测序结果与已发表的序列一致 .通过PCR扩增和基因重组 ,分别构建COX 2编码基因全长和羧基端部分编码序列的表达载体 ,并导入大肠杆菌DH5α中 ,通过IPTG诱导表达重组融合蛋白 ,结果导入全长编码基因表达载体的DH5α无COX 2融合蛋白表达 ,而羧基端部分基因编码的COX 2融合蛋白在DH5α中以包涵体的形式进行表达 .经SDS 聚丙烯酰胺凝胶电泳分析 ,在相对分子质量 (Mr)为 44 0 0 0处有 1条特异的蛋白质条带 .对以包涵体形式表达的蛋白质进行变性、重折叠及纯化后 ,得到了高纯度融合蛋白 .以重组融合蛋白免疫新西兰种大白兔 ,制作了抗COX 2多克隆抗体 ,经酶联免疫吸附测定、蛋白质印迹和免疫细胞化学方法检测 ,此抗体具有较高效价和特异性 .COX 2基因和多克隆抗体的获得 ,为进一步研究COX