Altered profiles of nuclear matrix proteins during the differentiation of human gastric mucous adenocarcinoma MGc80-3 cells

AIM： To find and identify specific nuclear matrix proteins associated with proliferation and differentiation of carcinoma cells, which will be potential markers for cancer diagnosis and targets in cancer therapy. METHODS： Nuclear matrix proteins were selectively extracted from MGcS0-3 cells treated with or without hexamethylamine bisacetamide （HMBA）, and subjected to 2-D gel electrophoresis. The resulted protein patterns were analyzed by Melanie software. Spots of nuclear matrix proteins differentially expressed were excised and subjected to in situ digestion with trypsin. Peptide masses were obtained by matrix-assisted laser-desorption/ ionization time of flight mass spectrometry （MALDI-TOFMS） analysis and submitted for database searching using Mascot tool. RESULTS： The MGc80-3 cells were induced into differentiation by HMBA. There were 22 protein spots which changed remarkably in the nuclear matrix, from differentiation of MGcS0-3 cells compared to control. Eleven of which were identified. Seven proteinsactin, prohibitin, porin 31HL, heterogeneous nuclear dbonucleoprotein A2/B1, vimentin, ATP synthase, and heat shock protein 60 were downregulated, whereas three proteins - heat shock protein gp96, heat shock protein 90-beta, and valosin-containing protein were upregulated, and the oxygen-regulated protein was only found in the differentiated MGc80-3 cells. CONCLUSION： The induced differentiation of carcinoma cells is accompanied by the changes of nuclear matrix proteins. Further characterization of those proteins will show the mechanism of cellular proliferation and differentiation, as well as cancer differentiation.

Comparisons of voided urine cytology, nuclear matrix protein-22 and bladder tumor associated antigen tests for bladder cancer of geriatric male patients in Taiwan, China

Aim： To compare the results of bladder tumor associated antigen （BTA TRAK）, nuclear matrix protein 22 （NMP 22） and voided urine cytology （VUC） in detecting bladder cancer. Methods： A total of 135 elderly male and 50 healthy volunteers enrolled in this study were classified into three groups： （i） 93 patients with bladder cancer; （ii） 42 patients with urinary benign conditions; and （iii） 50 healthy volunteers. BTA TRAK and NMP 22 kits were used to detect bladder cancer. Voided urine cytology was used to compare the sensitivity and specificity of the screening tests. Results： The sensitivity and specificity of cytology, BTA TRAK and NMP 22 were 24% and 97%, 51% and 73%, 78% and 73%, respectively. The level of NMP 22 increased with tumor grading. The BTA TRAK kit has the lowest sensitivity among the screening tests. The NMP 22 with the best sensitivity can be an adjunct to cytology for evaluating bladder cancer. Conclusion： The NMP 22 test has a better correlation with the grading of the bladder cancer than BTA TRAK. As cytology units are typically not available in hospitals or in outpatient clinics, NMP 22 might be a promising tool for screening bladder cancer.

Alreration of nuclear matrix-intermediate filament system and differential expression of nuclear matrix proteins during human hepatocarcinoma cell differentiation

AIM： To investigate the association between the configurational and compositional changes of nuclear matrix and the differentiation of carcinoma cells. METHODS： Cells cultured with or without 5 × 10^-3 mmol/L of hexamethylene bisacetamide （HMBA） on Nickel grids were treated by selective extraction and prepared for whole mount observation under electron microscopy. The samples were examined under transmission electron microscope. Nuclear matrix proteins were selectively extracted and subjected to subcellular proteomics study. The protein expression patterns were analyzed by PDQuest software. Spots of differentially expressed nuclear matrix proteins were excised and subjected to in situ digestion with trypsin. The peptides were analyzed by matrix-assisted laser- desorption/ionization time of flight mass spectrometry （MALDI-TOF-MS）. Data were submitted for database searching using Mascot tool （www.matrixscience.com）. RESULTS： The nuclear matrix （NM） and intermediate filament （IF） in SMMC-7721 hepatocarcinoma cells were found relatively sparse and arranged irregularly. The nuclear lamina was non-uniform, and two kinds of filaments were not tightly connected. After induction for differentiation by HMBA, the NM-IF filaments were concentrated and distributed uniformly. The heterogeneous population of filaments, including highly branched utrathin filaments could also be seen in the regular meshwork. The connection between the two kinds of filaments and the relatively thin, condensed and sharply demarcated lamina composed of intermediate- sized filaments was relatively fastened. Meanwhile, 21 NM proteins changed remarkably during SMMC-7721 cell differentiation. Four proteins, i.e. mutant Pystl, hypothetical protein, nucleophosminl, and LBP were downregulated, whereas four other proteins, eIF6, p44 subunit, 13-tubulin, and SIN3B were upregulated with the last one, SR2/ASF found only in the differentiated SMMC-7721 cells. CONCLUSION： The induced differentiation of SMMC-7721 cells by HMBA is accompanied by the configurational changes of nuclear matrix-intermediate filament （NM-IF） system and the compositional changes of nuclear matrix protein expression. These changes may be important morphological or functional indications of the cancer cell reversion.

CHANGES OF NUCLEAR MATRIX PROTEIN AND ITS RELATIONSHIP WITH c-erbB-2 IN HUMAN COLON ADENOCARCINOMA

Objective： Nuclear matrix protein is tissue, cell-type specific, and tumor-relative. It plays an important role in the regulation of intranuclear processes. Some researches also showed that a c-erbB-2 promoter-specific DNA-binding nuclear matrix protein is present only in malignant human breast tissues and induces mitogenesis and cell surface expression of the c-erbB-2 protein in resting NIH/3T3 cells. But it is not clear that how it in colon adenocarcinomas. Methods： Two-dimensional gel electrophoretic method was used for NMP identification and immunohistochemistry was used for c-erbB-2 detection in 12 cases of colon adenocarcinomas and matched adjacent normal colon tissues. Results： 5 different nuclear matrix proteins （named C1-C5） were identified in 12 colon adenocarcinoma specimens, but not in the matched adjacent normal colon tissues; 3 nuclear matrix proteins （named N1-N3） were identified in all 12 matched adjacent normal colon tissues, but not in colon adenocarcinoma specimens. A nuclear matrix protein （named N4） was detected in all of 9 moderated-well differentiated adenocarcinomas and all 12 matched adjacent normal colon tissues, but not in 3 poor-differentiated adenocarcinomas. All of the 10 colon adenocarcinomas which had the nuclear matrix protein C4 were c-erbB-2 expression positive. Conclusion： The data suggest that there are specific nuclear matrix proteins in colon adenocarcinomas and its subtypes, which maybe valuable to serve as markers of colon adenocarcinomas in future. Nuclear matrix protein C4 probably is a c-erbB-2 promotor-specific nuclear matrix protein in colon adenocarcinomas, and may induce the expression of c-erbB-2.

NUCLEAR MATRIX PROTEIN IN LEUKEMIA CELLS

Objective: To compare the composition of nuclear matrix proteins (NMP) between leukemia cells and normal bone marrow cells. Methods: NMP was isolated by high-salt extraction and identified in acute and chronic myelogenous leukemia cells as well as in the blast phase of chronic leukemia. On SDS-PAGE, NMPs with molecular myelogenous ferment from what were seen in normal bone marrow cells were present in both acute and chronic myelogenous leukemia. Conclusion: Marked changes of NMP, not only in contents but also in compositions, exist in leukemic cells compared with normal bone marrow cells. NMP may serve as a target of chemotherapeutic drug against leukemia.

The 5'-flanking cis-acting elements of the human ε-globin gene associates with the nuclear matrix and binds to the nuclear matrix proteins

The nucleax mains attachment regions(MARs) and the binding nuclear matrix proteins in the 5’-flalildng cisacting elements of the humanε-globin gene have been examined. Using in vitro DNA-matrix binding assay,it has been shown that the positive stage-specific regulatory element (ε-PREII, -446bp-419bp) upstream of this gene could specifically associate with the nuclear matrix from K562 cells, indicating thatε-PREII mad be an erythroidspecilic facultstive MAR. In gel mobility shift assay and Southwestern blotting assal an eothroid-specific nuclear matrix protein (ε-NMPk) in K562 cells has been revealed to bind to this positive regulatory element (E-PREII). Furthermore, we demonstrated that the silencer (-392hp -177bp) uP8tream of the humanε-globin gene could associate with the nuclear matrices from K562, HEL and Raji cells. In addition, the nucleax matrix proteins prepared from these three cell lines could also bind to this silencer, suggesting that this silencer element linght be a constitutive nuclear mains attachment region (constitutive MAR). Our results demonstrated that the nucleax madrid and nuclear mains proteins lxilght play an important role in the regulation of the human 5-globin gene expression.

STUDY ON NUCLEAR MATRIX PROTEINS FROM HUMAN BREAST CARCINOMA

Objective To investigate the marker protein of human breast carcinoma from nuclear matrix proteins (NMPs). Methods NMPs were injected subcutaneously into rabbit to get antiserum, which was used to detect the NMPs specificity for breast carcinoma. Results There was an apparent positive band (100 kD) in the NMPs of breast carcinoma, which did not exist in normal breast and other tumors that were detected.Conclusion One or one group of 100 kD NMPs were found to be related to human breast carcinoma, which may be involved in the carcinogenesis and development of human breast carcinoma and valuable for breast carcinoma diagnosis.

Changes of Nuclear Matrix Proteins Following the Differentiation of Human Osteosarcoma MG-63 Cells

Human osteosarcoma MG-63 cells were induced into differentiation by 5 mmol/L hexamethylene bisacetamide （HMBA）. Their nuclear matrix proteins （NMPs） were selectively extracted and subjected to two-dimensional gel electrophoresis analysis. The results of protein patterns were analyzed by Melanie software. The spots of differentially expressed NMPs were excised and subjected to in situ digestion with trypsin. The maps of peptide mass fingerprinting were obtained by MALDI-TOF-MS analysis, and were submitted for NCBI database searches by Mascot tool. There were twelve spots changed remarkably during the differentiation induced by HMBA, nine of which were identified. The roles of the regulated proteins during the MG-63 differentiation were analyzed. This study suggests that the induced differentiation of cancer cells is accompanied by the changes of NMPs, and confirms the presence of some specific NMPs related to the cancer cell proliferation and differentiation. The changed NMPs are potential markers for cancer diagnosis or targets for cancer therapy.

Interactions between the nuclear matrix proteins and the 5'-flanking cis-acting elements of the human ε-globin gene

An erythroid-specific nuclear matrix protein (termed ε-NMP_k) in K562 cells, which can specifically bind to the positive stage-specific regulatory element (ε-PRE Ⅱ, -446—-419 bp) upstream of the human ε-globin gene, has been identified by using gel mobility shift assay.Meanwhile, Southwestern blotting assay showed that the nuclear matrix protein ε-NMP_k in K562,cells may be composed of two polypeptides ( ～ 40 ku). In addition, it is observed in the gel mobility shift assay that the nuclear matrix proteins from K562, HEL and Raji cells can bind to the silencer DNA ( - 392— -177 bp) in the 5’-flanking sequence of human ε-globin gene respectively. However, the shift band K detected in K562 cells is different from shift band H/R in HEL and Raji cells, suggesting that a common nuclear matrix protein may exist in HEL and Raji cells. Results show that the nuclear matrix protein may play an important role in the regulation of the human ε-globin gene expression.

Anchoring of c-myc on nuclear matrix proteins in process of mouse thymic T lymphocyte proliferation induced by ConA

Isolation and characteriation of functional nudear matrix proteins involved in DNA anchoring and gene expression is one of the major subjects of current nudear matrix research. Southwestern blotting (DNA-protein hybridization) was applied to studying the anchoring of c-myc on the nudear matrix proteins in mouse thymic T lymphocytes. The results showed that c-myc bound to the lamin, p34 and p36 nudear matrix proteins specifically. In the process of mouse thymic PNA T lymphocytes proliferation induced by ConA, the anchoring of c-myc on p34 and p36 nudear matrix proteins changed dynamically.

Fluorescent and colorimetric immunoassay of nuclear matrix protein 22 enhanced by porous Pd nanoparticles

A modified ELISA realizing fluorescent and colorimetric immunoassay of nuclear matrix protein 22 (NMP 22) was developed based on porous Pd nanoparticles. The unique structure and excellent enzyme mimetic activity of porous Pd nanoparticles favor to oxidize o-phenylenediamine (OPD) into 2,3-phenazinediamine (oxOPD) by H2O2, producing colorimetric and fluorescence dual-readout signal for the detection of NMP 22. The developed immunoassay method will offer great potential in clinical research and diagnostic applications.

The interaction between the human β-globin locus control region and nuclear matrix

Our previous study showed that hydroxyurea (Hu) could induce HEL cells to express humanβ-globin gene. However the molecular mechanisms by which the expression of β-globin gene is activated and regulated are poorly understood. Here we show that the binding patterns between the core DNA sequences (HS2 core sequence -10681- -10971 bp , HS3 core sequence -14991- -14716 bp and HS4 core sequence -18586- -18306 bp) of DNase I hypersensitive sites in the human β-globin LCR and nuclear matrix proteins isolated from Hu induced and uninduced HEL cells are quite different. Results demonstrated that nuclear matrix proteins might play important roles in regulating the expression of humanβ-like globin genes through their interaction with HSs (HS2,HS3 and HS4 core sequences) in the LCR. Moreover, the results obtained from the in vitro DNA-matrix binding assay showed that the core DNA sequences of DNase I hypersensitive sites (HS2, HS3 and HS4) were unable to bind to the nuclear matrix isolated from uninduced HEL cells; in addition, HS2 core DNA sequence was capable of binding to the nuclear matrix prepared from Hu-induced HEL cells, while both HS3 and HS4 core DNA sequences could not do so. Results indicated that the HS2 core DNA sequence may be a functional MAR (matrix attachment region). We suggest that the HS2 core DNA sequence binding to the nuclear matrix in Hu-induced HEL cells may open the structure of chromatin to make the LCR accessible to the promoter of β-globin gene and to promote its transcription.

膀胱肿瘤抗原、尿核基质蛋白22、细胞角蛋白-19对膀胱癌的诊断价值分析

目的分析膀胱肿瘤抗原(BTA)、尿核基质蛋白22(NMP22)、细胞角蛋白-19(CK-19)对膀胱癌的诊断价值。方法选取53例膀胱癌患者作为膀胱癌组,49例泌尿系良性疾病患者作为对照组。比较两组患者CK-19、NMP22及BTA水平,分析三者水平与膀胱癌患者临床特征的关系,分析CK-19、NMP22及BTA单独及联合检测对膀胱癌的诊断价值。结果膀胱癌组患者尿液NMP22、BTA及血清CK-19水平均明显高于对照组,差异均有统计学意义(P﹤0.01)。肿瘤分期为Ⅲ~Ⅳ期的膀胱癌患者尿液NMP22、BTA及血清CK-19水平均明显高于Ⅰ~Ⅱ期患者,差异均有统计学意义(P﹤0.01)。CK-19、NMP22及BTA联合检测诊断膀胱癌的灵敏度和特异度分别为0.805和0.869,曲线下面积(AUC)为0.854(95%CI:0.774~0.934),均高于CK-19、NMP22及BTA单独检测。结论膀胱癌患者CK-19、NMP22及BTA水平显著升高,三者水平升高与肿瘤分期相关,密切监测三者水平变化可为临床诊断膀胱癌提供依据。

术前尿BTA、NMP22定量联合检测对膀胱癌的诊断价值研究

目的探讨术前尿BTA、NMP22定量联合测定对膀胱癌的诊断价值。方法选取2021年1月至2022年09月于惠州市中心人民医院泌尿外科确诊为膀胱癌的73例患者作为观察组,另选取同期就诊的73例泌尿系统良性疾病患者作为对照组。检测两组患者术前尿BTA、NMP22定量水平,根据检测结果回顾性分析两个指标在膀胱癌中的单项及联合诊断价值,同时分析不同临床肿瘤特征患者上述两个指标的阳性率差异情况。结果观察组和对照组的术前尿BTA定量水平分别为(997.85±237.73)pg/mL、(691.33±190.16)pg/mL;NMP22定量水平分别为(8.57±1.49)ng/mL、(6.23±1.29)ng/mL。与对照组相比,观察组患者术前尿BTA、NMP22水平均明显升高(P<0.01)。术前尿BTA、NMP22在膀胱癌诊断中的灵敏度分别为76.7%和78.1%,特异度为90.4%和91.8%,曲线下面积分别为0.849和0.867,此时两者的最佳截断值分别为834.55 pg/mL和7.47 ng/mL。两者联合诊断的灵敏度、特异度、曲线下面积分别为89.0%、87.7%、0.931,其中灵敏度及曲线下面积均较单项检测高。不同年龄、性别、BMI、吸烟情况患者的BTA和NMP22阳性率比较,差异无统计学意义(P>0.05);而不同肿瘤直径、肿瘤数目、肿瘤分级、肿瘤分期患者的BTA和NMP22阳性率比较,差异具有统计学意义(P<0.05)。结论术前尿BTA、NMP22定量水平测定对膀胱癌具有较好的诊断效能,具备无创、便捷、可批量检测等优点,且两者联合检测可提高诊断敏感度,减少漏诊可能,值得用于临床实践。

NMP22/Cr值在基层医疗单位膀胱癌诊断中的临床应用价值

目的分析尿核基质蛋白22(NMP22)/肌酐(Cr)比值在膀胱癌诊断中的临床应用价值。方法选取膀胱癌组(非肌层浸润性膀胱癌221例、肌层浸润性膀胱癌44例)、结石组(泌尿系统结石90例)和对照组(体检健康志愿者50例),检测各组患者尿NMP22及Cr的含量,采用ROC曲线分析其对膀胱癌诊断的作用。结果膀胱癌组尿液中NMP22/Cr值高于结石组和对照组(P均<0.001)。肌层浸润性膀胱癌NMP22/Cr值较非肌层浸润性膀胱癌显著升高,同时病理高级别肿瘤较低级别肿瘤NMP22/Cr值也升高(P均<0.001)。NMP22/Cr诊断膀胱癌的AUC值为0.808(95%CI:0.767~0.849)。当取NMP22/Cr值为19.55 ng·mg^(-1)的临界值时,敏感性为64.2%,特异性为93.6%。结论尿NMP22/Cr检测能够提高对膀胱癌的诊断效率,可以作为基层单位临床诊断膀胱癌的重要辅助检查。

尿液基细胞荧光原位杂交检测对膀胱尿路上皮癌的诊断价值

目的探讨尿液基细胞学(LBC)靶向的荧光原位杂交(FISH)对膀胱尿路上皮癌(BUC)的诊断价值。方法回顾性收集2020年10月—2022年10月于首都医科大学附属北京天坛医院泌尿外科行膀胱镜检查的128例患者的临床资料。所有患者在行膀胱镜检查前进行尿核基质蛋白22(NMP22)检测、尿LBC检测与尿LBC靶向的FISH检测,以术后病理结果为标准,分析3种检查方法的灵敏度和特异度。结果NMP22、尿LBC与LBC靶向的FISH的灵敏度分别为61.11%、79.17%、82.46%,特异度分别为57.14%、73.21%、86.67%;NMP22、尿LBC的灵敏度在检测高级别BUC时优于低级别,差异有统计学意义(P=0.01,P=0.03);3种方法对肌层浸润性膀胱癌与非肌层浸润性膀胱癌检测的灵敏度比较,差异无统计学意义(P≥0.05)。结论尿LBC靶向的FISH对BUC诊断的灵敏度和特异度较高,尤其是对于低级别BUC,可以作为BUC早期筛查、诊断的重要方法。

Nuclear matrix associated protein PML: an arsenic trioxide apoptosis therapeutic target protein in HepG2 cells

Objective To investigate arsenic trioxide (As 2O 3)-induced apoptosis and the effects on cell nuclear matrix related protein promyelocytic leukaemia (PML). Methods HepG2 cells were cultured in MEM medium and treated with 0.5, 2, 5 and 10 μmol/L As 2O 3 for either 24 h or 96 h at each concentration. In situ terminal deoxynucleotidyl transferase (TdT) labeling (TUNEL) and DNA ladders were used to detect apoptosis. Confocal microscopy and Western blotting were used to observe the expression of PML. Results The growth rates of HepG2 cells were slower in the As 2O 3 treated than the untreated control group. DNA ladder and TUNEL positive apoptotic cells could be detected in As 2O 3 treated groups. The expression of PML decreased in HepG2 cells with 2 μmol/L As 2O 3 treatment. Confocal images demonstrated that the expression of PML protein in HepG2 cell nuclei decreased after treatment with 2 μmol/L As 2O 3, and micropunctates characteristic of PML protein in HepG2 cell nuclei disappeared after treatment with 5 μmol/L As 2O 3.Conclusions Our results show that arsenic trioxide can significantly inhibit the growth of HepG2 cells in vitro. As 2O 3 induces apoptosis in HepG2 tumor cells in a time and concentration dependent manner. As 2O 3 may degrade the PML protein in HepG2 cell nuclei. The decreased expression of PML in As 2O 3 treated tumor cells is most likely to be caused by apoptosis. Nuclear matrix associated protein PML could be the target of As 2O 3 therapy.

荧光原位杂交和核基质蛋白22联合检测在膀胱癌诊断中的应用

目的:探讨荧光原位杂交和核基质蛋白22对膀胱尿路上皮癌诊断的价值,寻找一种敏感特异的无创性方法诊断膀胱癌。方法:对68例膀胱癌疑似患者的尿液标本同时进行荧光原位杂交、核基质蛋白22、尿脱落细胞学检测,同时,将3种方法结果与组织病理学诊断结果比较,评估它们对膀胱癌的临床诊断价值。结果:FISH、NMP22、尿脱落细胞学的敏感性分别为81.4%、86.0%、39.5%,特异性分别为84.0%、72.0%、96.0%,FISH联合NMP22检测的敏感性为79.1%、特异性为92.0%。结论:FISH-NMP22联合检测有较高的敏感性和特异性,其敏感性远高于细胞学检测,而特异性与细胞学检测相差甚小,联合检测较单一指标的检测对膀胱癌具有更高的诊断价值。

核基质蛋白22定量分析及尿液细胞学检查评估膀胱癌复发的价值研究

目的评估核基质蛋白22(NMP22)定量分析与尿液细胞学检查对膀胱癌复发的诊断价值。方法选取2008—2012年在海南医学院附属医院住院的浅表性膀胱癌患者144例。在膀胱镜检查之前患者均在3 d内连续每天提供3份用于尿液细胞学检查的尿液样本以及1份用于NMP22定量分析的尿液样本。以病理组织活检作为金标准,对NMP22定量分析与尿液细胞学检查对膀胱癌复发诊断价值的灵敏度和特异度进行评估。结果 144例患者中,52例(36.1%)诊断为复发性膀胱移行细胞癌。52例膀胱癌复发患者中,41例NMP22定量分析结果为阳性,23例尿液细胞学检查为阳性。NMP22定量分析诊断膀胱癌复发的灵敏度为78.8%(41/52),特异度为69.6%(64/92),阳性预测值为59.4%(41/69),阴性预测值为85.3%(64/75);尿液细胞学检查诊断膀胱癌复发的灵敏度为44.2%(23/52),特异度为83.7%(77/92),阳性预测值为60.5%(23/38),阴性预测值为72.6%(77/106)。两种方法诊断膀胱癌复发的灵敏度和特异度比较,差异有统计学意义(χ2=6.58、5.40,P=0.01、0.02);而两种方法诊断膀胱癌复发的阳性预测值和阴性预测值比较,差异无统计学意义(χ2=3.13、0.50,P=0.08、0.48)。NMP22定量分析与尿液细胞学检查在不同分期、分级、风险分层中的灵敏度比较,差异有统计学意义(P<0.05)。NMP22定量分析联合尿液细胞学检查、NMP22定量分析联合膀胱镜检查、尿液细胞学检查联合膀胱镜检查诊断膀胱癌复发的灵敏度分别为88.5%(46/52)、98.1%(51/52)及94.2%(49/52)。结论 NMP22定量分析法可用于浅表性膀胱癌复发的检测,尤其是在低度以及中度风险的人群,但本方法也因其相对较低的特异度在使用方面受到限制。

新候选癌基因STRBP8在人永生化食管上皮细胞癌变过程中差异表达的分析

背景与目的:近年来,核基质蛋白(nuclearmatrixproteins,NMPs)成分、结构与功能改变在肿瘤发生发展过程中的作用已成为人们研究的热点问题。分离并鉴定肿瘤相关的NMPs,是寻找肿瘤特异性标志物并进一步研究肿瘤发病机制的一个新途径。本研究通过检测类视网膜母细胞瘤结合蛋白8(similartoretinoblastomabindingprotein8,STRBP8)在人永生化食管上皮细胞癌变过程中的差异表达,为寻找食管癌特异性标志物和研究食管癌的发病机制提供新线索。方法:硫酸铵沉淀法提取人胚永生化食管上皮细胞系SHEE和由SHEE转化而来的食管癌细胞系SHEEC的NMPs,利用双向电泳、基质辅助激光解吸电离飞行时间质谱(MALDI鄄TOF鄄MS)和RT鄄PCR等技术检测STRBP8在SHEE和SHEEC中的差异表达。将STRBP8cDNA序列连接到pGEM鄄Teasy载体后,转化TOP10F蒺大肠杆菌感受态细胞,经筛选获得含STRBP8的阳性克隆,DNA序列测定后进行BLAST比对。结果:通过双向电泳和MALDI鄄TOF鄄MS技术分离并鉴定出核基质蛋白STRBP8只在SHEEC中表达,RT鄄PCR分析发现STRBP8mRNA也只出现在SHEEC细胞中。将其cDNA序列插入pGEM鄄Teasy载体后,经转化和筛选获得含STRBP8的阳性克隆。测序结果显示克隆得到的STRBP8cDNA片段与Genbank数据库上的序列完全一致。结论:STRBP8作为一种新?