The cloning of non-structural-1 (NS1) gene of H9N2 subtype of avian influenza virus in pGEX-4T-1 and pMAL-c2X plasmids and expression in <i>Escherichia coli</i>DH5<i>α</i>strain

Avian influenza is a viral contagious disease that affects poultry industry and human health. Vaccination has been considered as a preventive tool in the eradication of AI, but it causes some limitations including trade embargoes and interfering with serologic surveillance in differentiation between infected and vaccinated animals (DIVA strategy). Several distinct DIVA strategies have been presented to conquer these limitations. In this study, the open reading frame of NS1 gene of a H9N2 subtype of AI virus was amplified by polymerase chain reaction. After extraction and purification of NS1 gene from agarose gel, it was inserted into two different pGEX-4T-1 and pMAL-c2X plasmids and transferred in DH5α strain of Escherichia coli by using electroporation procedure. The E. coli colonies possessing recombinant NS1 gene were screened using PCR, restriction mapping and sequencing analysis. The expressed rNS1 protein was purified using affinity chromatography based on MBP (pMAL- c2X) and GST (pGEX-4T-1). The MBP-NS1 and GST- NS1 proteins on SDS-PAGE had bands with molecular weight of 68 and 52 kDa respectively. Western blotting with MBP-NS1 protein showed positive reaction using antisera obtained from chickens challenged with a H9N2 subtype strain. But, the most sera prepared from H9N2 vaccinated chickens were negative in WB. These findings indicated that the MBP-rNS1 protein of 26 kDa expressed by pMAL-c2X plasmid can be used in a DIVA for differentiation of AI infected and vaccinated chickens.

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.

A p34 ^( cdc2) _like Protein Is Localized in Both Nuclei and Cytoplasm of Physarum polycephalum

目前关于动物和酵母细胞中p34cdc2 的定位研究结果尚存在分歧 ,而关于该蛋白在植物细胞中的定位尚不清楚。以多头绒泡菌 (Physarumpolycephalum)S期、G2早期、G2中期、G2晚期、前期、中期和后末期的原质团和细胞核为材料进行免疫印迹 ,发现原质团和细胞核都含有一种分子量约 34kD的类p34cdc2 蛋白 ,该蛋白在原质团和细胞核中的含量在整个细胞周期进程中基本保持稳定。以抗p34cdc2 单克隆抗体为探针的免疫电镜结果显示 ,类p34cdc2 蛋白既分布于细胞核也分布于细胞质中 ,在细胞核中主要与染色体和核仁结合。经抗p34cdc2 单克隆抗体处理后 ,多头绒泡菌的有丝分裂启始迟滞约 2h。结果表明 ,多头绒泡菌类p34cdc2 蛋白存在于细胞核和细胞质中 ,与细胞有丝分裂密切相关 ,其含量在细胞周期进程中基本保持稳定。

Effects of P2Y_1 receptor on glial fibrillary acidic protein and glial cell line-derived neurotrophic factor production of astrocytes under ischemic condition and the related signaling pathways

Objective The present study aimed to explore the role of P2Y1 receptor in glial fibrillary acidic protein （GFAP） production and glial cell line-derived neurotrophic factor （GDNF） secretion of astrocytes under ischemic insult and the related signaling pathways. Methods Using transient right middle cerebral artery occlusion （tMCAO） and oxygen-glucose-serum deprivation for 2 h as the model of ischemic injury in vivo and in vitro, immunofluorescence, quantitative real-time reverse transcription-polymerase chain reaction （RT-PCR）, Western blotting, enzyme linked immunosorbent assay （ELISA） were used to investigate location of P2Y1 receptor and GDNF, the expression of GFAP and GDNF, and the changes of signaling molecules. Results Blockage of P2Y1 receptor with the selective antagonist N^6-methyl-2′-deoxyadenosine 3′,5′-bisphosphate diammonium （MRS2179） reduced GFAP production and increased GDNF production in the antagonist group as compared with simple ischemic group both in vivo and in vitro. Oxygen-glucose-serum deprivation and blockage of P2Y1 receptor caused elevation of phosphorylated Akt and cAMP response element binding protein （CREB）, and reduction of phosphorylated Janus kinase2 （JAK2） and signal transducer and activator of transcription3 （STAT3, Ser727）. After blockage of P2Y1 receptor and deprivation of oxygen-glucose-serum, AG490 （inhibitor of JAK2） reduced phosphorylation of STAT3 （Ser727） as well as expression of GFAP; LY294002, an inhibitor of phosphatidylinositol 3-kinase （PI3-K）, decreased phosphorylation of Akt and CREB; the inhibitor of mitogen-activated protein kinase kinase 1/2 （MEK 1/2） U0126, an important molecule of Ras/extracellular signal- regulated kinase （ERK） signaling pathway, decreased the phosphorylation of JAK2, STAT3 （Ser727）, Akt and CREB. Conclusion These results suggest that P2Y1 receptor plays a role in the production of GFAP and GDNF in astrocytes under transient ischemic condition and the related signaling pathways may be JAK2/STAT3 and PI3-K/Akt/CREB, respectively, and that crosstalk probably exists between them.

Function of apoptosis and expression of the proteins Bcl-2,p53 and C-myc in the development of gastric cancer

INTRODUCTIONIn China ,the incidence and mortality of gastric cancer rank the second among all cancers. Recent development of cancer [1-20].The aim of this study was investigat the insight of apoptosis and bcl-2, p53 and C-myc protein expression in the development of gastric cancer .

Fibrinogen-like protein 2 deficiency inhibits virus-induced fulminant hepatitis through abrogating inflammatory macrophage activation

BACKGROUND Heterogeneous macrophages play an important role in multiple liver diseases,including viral fulminant hepatitis(VFH).Fibrinogen-like protein 2(FGL2)is expressed on macrophages and regulates VFH pathogenesis;however,the underlying mechanism remains unclear.AIM To explore how FGL2 regulates macrophage function and subsequent liver injury during VFH.METHODS Murine hepatitis virus strain 3(MHV-3)was used to induce VFH in FGL2-deficient(Fgl2-/-)and wild-type(WT)mice.The dynamic constitution of hepatic macrophages was examined.Adoptive transfer of Fgl2-/-or WT bone marrowderived macrophages(BMDMs)into WT recipients with macrophages depleted prior to infection was carried out and the consequent degree of liver damage was compared.The signaling cascades that may be regulated by FGL2 were detected in macrophages.RESULTS Following MHV-3 infection,hepatic macrophages were largely replenished by proinflammatory monocyte-derived macrophages(MoMFs),which expressed high levels of FGL2.In Fgl2-/-mice,the number of infiltrating inflammatory MoMFs was reduced compared with that in WT mice after viral infection.Macrophage depletion ameliorated liver damage in WT mice and further alleviated liver damage in Fgl2-/-mice.Adoptive transfer of Fgl2-/-BMDMs into macrophage-removed recipients significantly reduced the degree of liver damage.Inhibition of monocyte infiltration also significantly ameliorated liver damage.Functionally,Fgl2 deletion impaired macrophage phagocytosis and the antigen presentation potential and attenuated the proinflammatory phenotype.At the molecular level,FGL2 deficiency impaired IRF3,IRF7,and p38 phosphorylation,along with NF-κB activation in BMDMs in response to viral infection.CONCLUSION Infiltrated MoMFs represent a major source of hepatic inflammation during VFH progression,and FGL2 expression on MoMFs maintains the proinflammatory phenotype via p38-dependent positive feedback,contributing to VFH pathogenesis.

Prognostic values of apoptosis-stimulating P53-binding protein 1 and 2 and their relationships with clinical characteristics of esophageal squamous cell carcinoma patients:a retrospective study

Background: Esophageal squamous cell carcinoma(ESCC) is a leading cause of cancer?related death, and new prognostic biomarkers are urgently needed. Apoptosis?stimulating P53?binding protein 1(ASPP1) and 2(ASPP2) have been reported to play important roles in the development, progression, metastasis, and prognosis of cancers, but their roles in ESCC have not been elucidated. In this study, we examined the expression of ASPP1 and ASPP2 in ESCC to evaluate their prognostic values.Methods: The protein expression of ASPP1, ASPP2, and P53 in 175 specimens of ESCC was detected using immuno?histochemical staining; their expression in cancerous and noncancerous tissues was scored according to the stain?ing intensity and the percentage of stained cells. The associations of ASPP1, ASPP2, and P53 with clinicopathologic parameters, overall survival(OS), and disease?free survival(DFS) were analyzed.Results: The protein expression levels of ASPP2 and P53 were significantly higher in cancerous tissues than in paired noncancerous tissues(P < 0.001), whereas the expression levels of ASPP1 in the two groups were similar. In ESCCs, ASPP1 expression was significantly associated with histological differentiation(P = 0.002) and invasive depth(P = 0.014); ASPP2 expression was associated with age(P = 0.029) and histological differentiation(P < 0.001); and P53 expression was associated with age(P and P53 expression. Survival an= 0.021) and tumor size(P alysis revealed that high AS= 0.040). No correlations were found between ASPP1, ASPP2,PP2 expression was significantly associated with increased 5?year OS(P = 0.001) and DFS rates(P ate of ESCC patients(= 0.010) and that high P53 expression was significantly associated with a reduced 5?year DFS rP atio(HR): 0.541, 9= 0.015). Multivariate Cox analysis indicated that ASPP2 was an inde?pendent predictor of OS [hazard r5% confidence interval(CI) 0.363–0.804] and DFS(HR: 0.599, 95% CI 0.404–0.888) of ESCC patients and that P53 was an independent predictor of DFS(HR: 2.161, 95% CI 1.100–4.245).Conclusions: ASPP1 might be involved in the progression of ESCC, and ASPP2 was a potential prognostic biomarker of ESCC and should be evaluated in future studies.

HER2 gene status and the relationship with p21 protein expression in gastric cancer

Objective： We aimed to analysis the HER2 gene status and its relationship with p21 protein expression in gastric carcinoma. Methods： Fluorescence in situ hybridisation （FISH） and immunohistochemistry （IHC） techniques were used to detect HER2 gene status and p53 protein in 59 cases of gastric cancer. Results： FISH detection of HER2 gene amplification rate was 16.9% （10/59）, HER2 gene amplification in 49 cases without copy number gain and gene amplification were a total of 49.2% （29/59）. HER2 protein expression was 42.4% （25/59）, HER2 gene amplification rates in patients with ＋＋＋, ＋＋ HER2 protein expression were 3/3 and 5/8, while in patients with ＋ HER2 protein expression, it was 2/14, there was significant difference （P 0.05）. p21 protein expression rate was 49.2% （29/59）, HER2 gene amplification rates and p21 protein expression had significant difference in tumor invasion depth, lymph node metastasis （P 0.05）; had no statistical significance in histological type, age, gender differences （P 0.05）. Conclusion： HER2 gene amplification rate and gene copy number had positively correlation with p21 protein expression, HER2 gene status and expression of p21 protein combined detection can provide a reference value in gastric cancer metastasis, patient’s condition development and prognosis, it also can guide clinical development of individual treatment.

Interaction among Rb/p16, Rb/E2F1 and HDAC1 Proteins in Gallbladder Carcinoma

The mechanism and interaction among Rb/p16, Rb/E2F1 and HDAC1 proteins in gallbladder carcinoma were investigated. By using the immunoprecipitation method, the interactions among Rb, p16, E2F1, HDAC1 proteins in gallbladder carcinoma cell line （Mz-ChA-1） were studied. It was found that there were Rb and E2F1 proteins in the precipitates with anti-HDAC1, and there were HDAC1 and E2F1 proteins in the precipitate with anti-Rb. It was concluded that there are specific interactions among Rb, HDAC1 and E2F1 proteins in gallbladder carcinoma, indicating the existence of the direct Rb/E2F1/HDAC1 signal transduction pathway. There is no direct relationship between p16 proteins with Rb, HDAC1, and E2F1 proteins.

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.

Differential activation of mitogen-activated protein kinases by γ-irradi-ation in IEC-6 cells: Role of intracellular Ca^(2+)

Objective: To explore the effects of γ-irradiation on mitogen-activated protein kinases (MAPKs) and role of intracellular calcium in this event in intestinal epithelial cell line 6 (IEC-6 cells). Methods: After cultured rat IIEC-6 cells with or without the pretreatment of intracellular Ca2+ chelator were exposed to Y-ir-radiation of 6 Gy, the total and phosphorylated MAPKs in the cells were determined with Western blotting and apoptosis was examined with flow cytometry. Activities of Extracellular signal-regulated protein kinase (ERK) and p38 MAPK were determined by using immuoprecipitation followed by Western blotting. Results: In response to γ-irradiation, phosphorylation of ERK was not significantly observed, while the levels of phosphorylated c-Jun NH2-terminal kinase (JNK) and p38 MAPK were increased in 30 min and reached the peak 2 h after exposure to 6 Gy γ-irradiation, though the cell viability was significantly lowered 12 h. On the other hand, no obvious changes were seen in the total protein levels of ERK, JNK and p38 MAPK. Chelation of intracellular Ca2+ almost completely suppressed the JNK and p38 MAPK phosphorylation induced by γ-irradia-tion, but removal of external Ca2+ had no such effect. Activation of p38 MAPK, but not of ERK, was seen to have a correlation with γ-irradiation induced apoptosis. Conclusion: The results suggest that γ-irradiation is a potent activator for JNK and p38 MAPK, and Ca2+ mobilized from intracellular stores plays an important role in the activation of MAPKs and the induction of apoptosis in IEC-6 cells.

Localization and function of a eukaryotic-initiation-factor-2-associated 67-kDa glycoprotein

AIM: To study the localization and function of a eukaryotic initiation factor 2 (eIF2α)-associated 67-kDa glycoprotein (p67).METHODS: Immunofluorescence staining,35S-Met/Cys metabolic labeling,Western blotting analysis,sucrose gradient centrifugation and high speed centrifugation were used to determine the localization of proteins in transiently transfected COS-1 cells.Transient co-transfection followed by co-immunoprecipitation was used to study the interaction between p67 and double-stranded RNA (dsRNA)-dependent protein kinase (PKR).Wheat germ agglutinin agarose beads were used to absorb glycosylated proteins.In vivo 32P-labeling followed by immunoprecipitation and Western blotting were used to measure PKR autophosphorylation,eIF2α phosphorylation,and p67 expression in normal and breast cancer cells.RESULTS: The image from immunofluorescence staining showed that p67 was overexpressed in the cytosol but not in the nucleus.In a sucrose gradient,approxi-mately 30% of the overexpressed p67 was bound with ribosomes.p67 interacted with the kinase domain,butnot the dsRNA-binding domains of PKR.Only the glycosylated p67 was associated with the ribosome,and p67 did not compete with PKR for ribosome binding.In breast cancer cells,there was increased autophosphorylation of PKR but no phosphorylation of eIF2α,compared with normal breast cells.α The ratio of glycosylated/deglycosylated p67 was altered in breast cancer cells.CONCLUSION: Glycosylation of p67 is required for its ribosomal association and can potentially inhibit PKR via interaction with the kinase domain of PKR.

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.

THE QUANTITATIVE MEASUREMENT OF BCL-2, P53 PROTEIN AND PCNA EXPRESSION IN BREAST CARCINOMA AND THEIR CORRELATION WITH PROGNOSIS

To study quantitative index of bci-2, P53, Nroliferating cell nuclear antigen (PCNA),ER and PR in breast carcinoma and their correiation and their relatiousbip with prognosis, the ex expression of bcl-2, P53 and PCNA were studied by immunohistochemical technique. The measurementof ER and PR used enzyme linked affinuity histochemical methods. The quantitative index was analyzed by image technique. All analyses were hased on 60 breast carcinomas. The results were as follows:the more bcl-2 protein, the lower histological graded the longer survival term and the highersurvival rate (P< 0. 05). The quautitative measurement of bcl-2, P53 and PCNA expression were ofvalue in evaluating the degree of differentiation and prognosis in breast carcinoma. The quantitativeand qualitative measurement or p53 protein expression showed a Ⅰwerful evidence in evaluatingprognosis of bcl-2 were more significant in evaluating poor prognosis of breast carcinoma. A relationship between bcl-2 and ER, PR showed a better value for response to endocrine therapy in breastcarcinoma patients.

p53、bcl-2蛋白和p-gp在鼻咽鳞癌中表达的研究

目的 研究 p5 3、bcl 2蛋白和 p gp在鼻咽鳞癌组织中的表达及其临床病理特征的关系 ,探讨其在预后评估中的意义。方法 采用免疫组化SP法检测 6 4例鼻咽鳞癌组织中p5 3、bcl 2和 p gp的表达。结果 鼻咽鳞癌组织中 p5 3、bcl 2和p gp阳性率分别为76 .5 6 % (4 9/ 6 4 )、89.0 6 % (5 7/ 6 4 )、17.19% (11/6 4 )。p5 3、bcl 2蛋白过表达均与颈部淋巴结转移、组织分化程度有关 (P <0 .0 1)。p gp过表达与bcl 2蛋白过表达呈正相关 (P <0 .0 5 ) ,p5 3蛋白过表达与bcl 2蛋白过表达呈正相关 (P <0 .0 0 1)。结论 p5 3和bcl 2蛋白均参与鼻咽鳞癌的发生与分化 ,其表达水平的不同有助于预后判断 ;

肺癌组织中耐药相关蛋白和p53 bcl-2表达及其意义

目的:探讨肺癌组织中耐药相关蛋白和p53、bcl-2表达及其意义。方法:应用免疫组化技术检测治疗前73例肺癌组织标本中P-gp、MRP、LRP、GST-π、p53和bcl-2表达。结果:非小细胞肺癌组P-gp、LRP、MRP+LRP、P-gp+p53的蛋白表达明显高于小细胞肺癌组(P<0.05)。腺癌组MRP、LRP、MRP+LRP、MRP+LRP+GST-π、MRP+LRP+P-gp+GST-π蛋白阳性表达高于鳞状细胞癌组、小细胞肺癌组(P<0.05),MRP+GST-π共表达者高于鳞状细胞癌组(P<0.01),P-gp+p53共表达者高于小细胞肺癌组(P<0.05),bcl-2蛋白阳性表达低于鳞状细胞癌组、小细胞肺癌组(P<0.05)。鳞状细胞癌组P-gp、P-gp+p53、P-gp+bcl-2的蛋白表达明显高于小细胞肺癌组(P<0.05)。P-gp与p53、bcl-2蛋白阳性表达呈正相关(P<0.05)。p53与bcl-2蛋白阳性表达呈正相关(P<0.01)。MRP与GST-π蛋白阳性表达呈正相关(P<0.05)。结论:肺癌耐药为一多途径多基因参与的过程,P-gp、LRP、MRP、GST-π、p53、bcl-2表达及其共表达可作为监测肺癌细胞原发性耐药的指标。

缺氧缺血性脑损伤大鼠脑组织海马区p-tau蛋白与凋亡相关蛋白Bcl-2、Bax的关系

目的观察缺氧缺血性脑损伤(HIBD)大鼠脑组织海马区磷酸化tau(p-tau)蛋白及凋亡相关蛋白Bcl-2、Bax的表达,并分析其相关性。方法选择新生SD大鼠56只,随机分为正常对照组8只、假手术组8只和HIBD组40只(按处死时间点分为3、6、12、24、48 h 5个亚组,每组8只)。HIBD组参照Rice法建模,并在不同时间点断头取脑。假手术组仅暴露左颈总动脉,正常对照组未做处理,均于手术结束后断头取脑。采用HE染色法观察各组脑组织海马区细胞形态结构改变,免疫组化染色法观察各组脑组织海马区p-tau、Bcl-2、Bax蛋白阳性细胞表达。结果正常对照组及假手术组脑组织细胞形态结构正常,基本无损伤性改变。HIBD组在HIBD后3 h细胞无明显变化;HIBD后6 h出现细胞肿胀,结构排列紊乱;HIBD后24 h细胞肿胀明显,细胞核固缩、碎裂;HIBD后48 h细胞内出现凋亡小体,神经细胞数量锐减。HIBD组各时间点脑组织海马区p-tau、Bcl-2、Bax蛋白阳性细胞数均较正常对照组和假手术组显著增多(P均<0.05);HIBD后12 h内,脑组织海马区p-tau蛋白阳性细胞数与Bcl-2、Bax蛋白阳性细胞数均呈正相关(P均<0.05)。结论 HIBD后脑组织海马区细胞启动了凋亡程序,p-tau蛋白参与了海马区细胞的凋亡过程,并且与Bcl-2、Bax蛋白的表达存在相关性。

P-糖蛋白与Bcl-2蛋白在急性白血病中的表达及临床意义

目的 :研究多药耐药基因 mdr- 1和凋亡抑制基因 Bcl- 2对白血病预后的影响。方法 :用免疫组织化学染色方法检测白血病患者 P-糖蛋白 ( P- gp)和 Bcl- 2蛋白的表达。结果 :在 6 4例急性白血病患者中 ,P- gp和 Bcl- 2蛋白表达的阳性率分别为 37.5 %和 6 7.3%。复发患者的 P- gp阳性率 ( 5 9.1% )明显高于初治患者 ( 2 6 .2 % ) ( P <0 .0 5 )。Bcl- 2阳性率在初治与复发患者之间无显著差异。10例 P- gp与 Bcl- 2均阳性的患者全部为复发患者。结论 :P- gp和 Bcl- 2联合检测可能对评价急性白血病的预后更有意义。

抗癌方对HepG_2人肝癌细胞株P_(53)蛋白表达的影响

目的观察抗癌方对ＨｅｐＧ２人肝癌细胞株Ｐ５３蛋白表达的影响，以探讨其抗癌作用机理。方法采用ＭＴＴ法分析抗癌方对人肝癌细胞株ＨｅｐＧ２细胞生长的影响。结果抗癌方能明显抑制ＨｅｐＧ２的生长，对ＨｅｐＧ２细胞的半数生长的抑制剂量（ＩＣ５０）为１ｍｇ／ｍｌ。ＬＳＡＢ方法观察发现抗癌方能诱导ＨｅｐＧ２细胞株从相当弱到非常强的比较致密的细胞核染色，且低浓度（０．１ｍｇ／ｍｌ）Ｐ５３蛋白表达诱导作用强于高浓度（１ｍｇ／ｍｌ），几乎将近５０％的细胞出现Ｐ５３蛋白高表达。提示：抗癌方诱导ＨｅｐＧ２Ｐ５３蛋白高达表，可能为其杀伤ＨｅｐＧ２细胞株、诱导其凋亡的机制之一。

P-gp、MRP、LRP、P53及c-erbB-2在非小细胞肺癌中的表达

目的:探讨P糖蛋白(P-gp)、多药耐药相关蛋白(MRP)、肺耐药蛋白(LRP)、P53蛋白及c-erbB-2蛋白在术前未经治疗的非小细胞肺癌(NSCLC)中的表达及相互间的关系。方法:采用免疫组化法检测78例NSCLC癌组织及15例癌旁肺组织(距癌灶5 cm)中P-gp、MRP、LRP、P53及c-erbB-2的蛋白表达情况。结果:免疫组化显示P-gp、MRP、LRP、P53及c-erbB-2在肺癌组织中的阳性表达率分别是65.4%(51/78)、39.7%(31/78)、56.4%(44/78)、53.8%(42/78)及43.6%(34/78),均显著高于癌旁肺组织中的表达水平(P<0.05);MRP和LRP蛋白表达在不同病理类型(腺癌、鳞癌及大细胞癌)之间比较均具有显著性差异(P分别为0.008和<0.001),LRP及P53蛋白表达在不同病理分化程度之间具有显著性差异(P分别为0.025和0.026);c-erbB-2表达与P-gp、MRP、LRP、P53均有相关性(Spearman相关系数分别为0.317、0.401、0.519和0.341,P值分别为0.005、<0.001、<0.001和0.002),P53与MRP之间(Spearman相关系数为=0.260,P=0.022)以及LRP与MRP之间(Spearman相关系数为0.371,P=0.001)有相关性。结论:P-gp、MRP、LRP、P53及c-erbB-2这些蛋白的表达在NSCLC的多药耐药形成及肿瘤的发生发展中可能具有一定的协同作用。