微小RNA-103a-3p通过肿瘤蛋白53调控凋亡抑制剂1/P53对骨质疏松症的影响

目的探讨微小RNA(miR)-103a-3p调控细胞肿瘤蛋白53调控凋亡抑制剂1(TRIAP1)对成骨细胞分化以及去卵巢小鼠骨量的影响。方法MC3T3-E1细胞分为正常对照(NC)组、miR-103a-3p-NC组、miR-103a-3p模拟(mimc)组、miR-103a-3p mimic+TRIAP1-NC组、miR-103a-3p mimic+TRIAP1 mimic组。Real-time PCR检测细胞miR-103a-3p、TRIAP1、P53的mRNA表达,MTT法和流式细胞术检测细胞增殖及凋亡,免疫荧光染色和茜红素染色检测细胞骨架F-actin表达和矿化情况,ELISA检测细胞碱性磷酸酶(ALP)活性。24只雌性小鼠设为sham组、骨质疏松症(OP)组、miR-103a-3p antagonist-NC组和miR-103a-3p antagonist组,每组6只摘取双侧卵巢制备OP模型,sham组仅分离卵巢组织周围脂肪。测定骨组织miR-103a-3p、TRIAP1、P53、ALP、骨钙素(OCN)、骨桥蛋白(OPN)的mRNA表达,microCT测定骨密度(BMD)、骨矿物质含量(BMC),HE染色观察骨组织病理改变。结果细胞转染miR-103a-3p mimic后,miR-103a-3p及P53表达升高、TRIAP1表达降低,细胞增殖降低、凋亡增加,F-actin表达减弱,钙结节数量减少,ALP活性降低(P<0.01);而在增加转染TRIAP1 mimic后,以上miR-103a-3p mimics导致的结果均得到显著逆转(P<0.01)。OP组小鼠骨组织miR-103a-3p、P53表达升高,TRIAP1、ALP、OCN、OPN基因表达降低,BMD、BMC降低,骨组织结构破坏(P<0.05);miR-103a-3p antagonist组小鼠骨组织miR-103a-3p及P53表达降低,TRIAP1、ALP、OCN、OPN基因表达升高,BMD、BMC升高,骨组织结构改善(P<0.05)。结论MiR-103a-3p可介导TRIAP1/P53抑制成骨细胞增殖及矿化,而miR-103a-3p拮抗治疗可减少OP小鼠骨量丢失。

含砷中药青黄散方案治疗超高龄伴TP53突变高危骨髓增生异常综合征1例并文献复习

骨髓增生异常综合征(MDS)是起源于造血干细胞的克隆性、髓系肿瘤性疾病,其伴原始细胞增多亚型及伴肿瘤蛋白53(TP53)基因突变均与高危疾病预后分层相关,其中TP53基因突变还与治疗耐药相关。高龄MDS患者的器官功能下降,合并症多,移植不可行,且多数不能耐受化疗、去甲基化药物治疗。患者为超高龄男性,确诊MDS伴原始细胞增多Ⅰ型,初诊时全血细胞进行性下降且需输血支持,修订版国际预后评分系统极高危,伴TP53基因突变。与同类患者比较,应用含砷中药青黄散方案治疗后中位生存期延长,血象三系有不同程度改善,生活质量提高,未发生治疗相关不良反应,耐受性良好,达到高龄MDS患者提高生活质量、延长生存期的治疗目标。本文回顾患者病历资料及应用含砷中药青黄散方案治疗过程,并结合国内外相关文献对高龄MDS的临床特点、治疗方法及相关基因突变特征进行分析,以期为高龄或超高龄预后不良MDS患者的治疗提供借鉴。

TP53INP1介导TGF-β1对膀胱癌细胞增殖、迁移的影响

目的 分析肿瘤蛋白53诱导的核蛋白1(TP53INP1)介导转化生长因子-β1(TGF-β1)对膀胱癌细胞增殖、迁移的影响。方法 选取2019年3月至2022年3月膀胱癌切除术的患者癌组织、癌旁组织标本40例,检测TP53INP1、TGF-β1表达量。膀胱癌细胞传代培养后分为TP53INP1-NC组、TP53INP1组、TGF-β1-NC组、TGF-β1组、TP53INP1+anti-TGF-β1-NC组、TP53INP1+anti-TGF-β1组。分析各组细胞增殖、凋亡、迁移情况。结果 与癌组织比较,癌旁组织TP53INP1、TGF-β1表达量较低(P<0.05)。与TP53INP1-NC组比较,TP53INP1组TP53INP1、B淋巴细胞瘤-2相关X蛋白(Bax)、天冬氨酸特异性半胱氨酸蛋白酶3(Caspase-3)、上皮性钙黏附素(E-cadherin)表达量、凋亡率水平较高,增殖率、细胞迁移数水平、B淋巴细胞瘤2基因(Bcl-2)、基质金属蛋白酶-2(MMP-2)、基质金属蛋白酶-9(MMP-9)表达量较低(P<0.05)。与TGF-β1-NC组比较,TGF-β1组TGF-β1、Bax、Caspase-3、E-cadherin表达量、凋亡率水平较高,增殖率、细胞迁移数水平、Bcl-2、MMP-2、MMP-9表达量较低(P<0.05)。双荧光素酶报告试验显示,与TGF-β1-NC组比较,TGF-β1组WT-TP53INP1荧光素酶活性降低(P<0.05),对MUT-TP53INP1荧光素酶活性影响较小(P>0.05)。与TP53INP1+anti-TGF-β1-NC组比较,TP53INP1+anti-TGF-β1组TGF-β1、Bax、Caspase-3、E-cadherin表达量、凋亡率水平较低(P<0.05),增殖率、细胞迁移数水平、Bcl-2、MMP-2、MMP-9表达量较高(P<0.05)。结论 TP53INP1可能通过靶向作用于TGF-β1而参与膀胱癌细胞增殖、凋亡、迁移,为膀胱癌诊治提供了新方向。

Down-expression of tumor protein p53-induced nuclear protein 1 in human gastric cancer

AIM： Overexpression of tumor protein p53-induced nudear protein 1 （TP53INP1） induces G1 cell cycle arrest and increases p53-mediated apoptosis. To clarify the clinical importance of TP53INP1, we analyzed TP53INP1 and p53 expression in gastric cancer, METHODS： TP53INP1 and p53 expression were examined using immunohistochemistry in 142 cases of gastric cancer. The apoptosis of gastric cancer cells was analyzed using the TUNEL method. The relationship between the expression of TP53INP1 and clinicopathological factors was statistically analyzed. RESULTS： TP53INP1 was expressed in 98% （139/142 cases） of non-cancerous gastric tissues and was downexpressed in 64% （91/142 cases） of gastric cancer lesions from the same patients. TP53INP1 expression was significantly decreased （43.9%） in poorly differentiated adenocarcinoma compared with well or moderately differentiated adenocarcinoma （81.6%）. Cancers invading the submucosa or deeper showed lower positively （59.1%） compared with mucosal cancers （85.2%）. Decrease or loss of TP53INP1 expression was significantly correlated with lymphatic invasion （54.3% vs 82.0% without lymphatic invasion） and node-positive patients （31.3% vs 68.3% in node-negative patients）. P53 was expressed in 68 （47.9%） patients of gastric cancer, whereas it was absent in normal gastric tissues. A significant association was also observed between TP53INP1 status and the level of apoptosis in tumor cells： the apoptotic index in TP53INP1-positive tissues was significantly higher than that in TP53INP41-negative portions. Finally, when survival data were analyzed, loss of TP53INP1 expression had a significant effect in predicting a poor prognosis （P= 0.0006）.CONCLUSION： TPS3INP1-positive rate decreases with the progression of gastric cancer. TPS3INP1 protein negativity is significantly associated with aggressive pathological phenotypes of gastric cancer. TPS3INP1 is related to the apoptosis of gastric cancer cells. The decreased expression of the TPS3INP1 protein may reflect the malignant grade of gastric cancer and is regarded as an adverse prognostic factor.

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 .

Relationship between therapeutic efficacy of arterial infusion chemotherapy and expression of P-glycoprotein and p53 protein in advanced hepatocellular carcinoma

AIM： To investigate the relationship between the chemotherapeutic drug efficacy and the expression of P-glycoprotein （PGP） and p53 protein in advanced hepatocellular carcinoma （HCC）. METHODS： The study was conducted on 41 patients with advanced HCC who were treated by repeated arterial infusion chemotherapy. Biopsy specimens from the tumor were collected before the start of treatment in all the patients, and the specimens were stored frozen until immunohistochemical staining, which was performed after the start of treatment, to detect PGP and p53 protein expressions. Twenty of the fortyone patients were treated with an anthracycline drug （epirubicin hydrochloride; anthracycline group）, and the remaining 21 were treated with a non-anthracycline drug （mitoxantrone hydrochloride in 11 patients and carboplatin in 10 patients; non-anthracycline group）. The relationship between the chemotherapeutic efficacy and the results of immunostaining were compared between the two groups. RESULTS： Before the start of the treatment, PGPpositive rate was 90.2% （strongly-positive, 36.6%） and p53 protein-positive rate was 34.1% （strongly-positive, 19.5%）. In the anthracycline group, the response rate was 40.0%. The number of patients showing poor response to the treatment was significantly larger in the patients with strongly positive PGP expression （P= 0.005）, and their prognoses were poor （P= 0.001）. in the nonanthracycline group, the response rate was 42.9%,and there was no significant relationship between the chemotherapeutic drug efficacy and the PGP or p53 protein expression. When only the data from the 11 patients treated with anthraquinone drug, mitoxantrone, were analyzed, however, the number of patients who showed poor response to treatment was significantly higher among the p53-positive patients （P= 0.012）, irrespective of the survival outcome. CONCLUSION： The chemotherapeutic efficacy with an anthracycline drug for advanced HCC can be predicted by immunohistochemical analysis of PGP expression. Similarly, immunostaining to evaluate p53 protein may be useful to predict the response in patients treated with an anthraquinone drug.

DNA PLOIDY，EXPRESSION OF p53 PROTEIN AND METASTATIC BEHAVIOUR OF GASTRIC CARCINOMA

DNA ploidy of 57 gastric carcinomas with metastases(12 liver,1 adrenal,4 ovary and 48 lymph node) were measured by flow cytometry.DNA anueploidy was significantly related to liver metastases:9 out of 12 gastric carcinomas with liver metastases were anueploid(75%) as compared to 13 out of 45(28.8%) of cases without liver metastases(P<0.01);the one gastric carcinoma with adrenal metastasis was also anueploid.DNA ploidy was not related to ovarian or lymph node metastases.Another interesting finding was that all of 3 gastric carcinomas with liver metastases which showed a diploid DNA pattern,expressed p53 protein, while all of 3 carcinomas with liver metastases but no p53 protein expression were anueploid.The expression of p53 protein was not related to ovarian metastases.The results suggested that an anueploid DNA pattern and the expression of p53 protein are both objective markers valuable in predicting high risk potential of metastases to the liver,and that the combined detection of these markers can be a most useful method in the follow-up of Patients with gastric carcinoma in detecting those at high risk of developing metastases following surgical resection.Also the poorer prognosis of Patients with gastric carcinoma showing an anueploid DNA pattern may be related to the development of distant organ metastases through the blood vascular system.Furthermore,the clone of gastric carcinoma cells which accumulate p53protein or show an anueploid DNA pattern may have a causative role in the development of liver(&.adrenal) metastases.

Effect of Electroacupuncture on Expression of p53 Protein in Cerebral Cortex of Rats with Global Cerebral Ischemia/Reperfusion Injury

Objective: To observe the effect of electroacupuncture (EA) on expression of p53 protein in cerebral cortex of senile rats with global cerebral ischemia/reperfusion (IR) injury and to explore its mechanism. Methods: The cerebral IR injury rat model was established referring to Pulsinelli 4-vessel occlusion method. Thirty-six SD rats were randomly and evenly divided into the control group, the IR group and the IR plus EA (IR-EA) group. The animals in the control group were subjected to electrocauterization of vertebral arteries in bilateral flank orifice alone with the general carotid arteries unoccluded. To rats in the IR-EA group, immediately and 24h, 48h, 72h after cerebral IR, EA treatment on bilateral acupoint 'Zusanli' (ST36) was applied once a day, lasting for 60 minutes. After the final treatment, all the rats were sacrificed and their brains were taken to examine p53 protein expression by the immunohistochemical method. Results: Cells with positive p53 immunoreactivity in the cerebral cortex of rats in the IR group was significantly higher than that in the control group ( P<0. 05), while that in the IR-EA group was significantly lower than that in the IR group ( P<0. 05). Conclusion: EA could remarkably reduce expression of p53 protein in the cerebral cortex of senile rats with global cerebral IR injury, which might be one of the means for EA to inhibit neuronal ap-optosis after cerebral IR injury.

EXPRESSION OF P53 PROTEIN AND PROLIFERATING CELL NUCLEAR ANTIGEN IN HUMAN GESTATION TROPHOBLASTIC DISEASE

To study the relationship between p53 protein, proliferating cell nuclear antigen (PCNA) expression and benign or malignant gestational trophoblastic disease (MGTD). Methods: The histotomic sections of 48 patients with gestational trophoblastic disease and 24 patients of normal chorionic villi were stained using immunohistochemistry. The monoclonal antibodies were used to determine p53 protein and PCNA. Results: The frequency of p53 and PCNA positive expression were significantly different among the chorionic villi of normal pregnancy, hydratidiform mole (HM) and MGTD. But neither p53 nor PCNA has any relation with the clinical staging or metastasis of MGTD. Conclusion: Both P53 and PCNA are valuable in diagnosis of human gestational trophoblastic disease.

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.

Human papillomavirus and p53 protein immunoreactivity in condylomata acuminatum and squamous cell carcinoma of penis

Aim: To determine the immunoreactive pattern of human papillomavirus (HPV) antigen and p53 protein in condylo-mata acuminatum (CA) and squamous cell carcinoma (SCC) of penis. Methods: Immunohistochemistry for HPVand p53 were performed in 40 specimens of formalin fixed, paraffin embedded tissues using a polyclonal (rabbit) anti-body against HPV and a monoclonal (mouse) antibody against human p53 protein. Twenty one cases of CA and nine-teen cases of SCC were examined. Results: HPV antigen was detected in all 21 CA and 2 penile SCC. p53 proteinoverexpression was observed in 12 of 19 (63%) SCC in which 6 cases were strong positive. Five of 21 CA (24%)showed low-grade p53 protein overexpression. Conclusion; CA is related to HPV infection and some cases showp53 protein low-grade overexpression. In contrast, p53 protein overexpression is common in penile SCC, which is sel-dom related to HPV infection. (Asian J Androl 2001 Mar; 3: 75-77)

EXPRESSION OF p53 PROTEIN IN CANCERS OF SMALL INTESTINE AND ITS RELATIONSHIP TO CLINICAL COURSE AND PROGNOSIS

In order to study the relationship of p53 gene mutation with the occurrence and prognosis of cancer of small intestine, expression of p53 protein was immunohistochemically examined. The results showed that p53 protein expression was high in 75% of small intestine cancer, and positive in 21.1% of the tissues close to cancer. In 7 cases of small intestinal adenoma, only one was immunoreactive. Sixteen samples of normal tissue of the intestine didn't show expression of p53protein. The study also found that the degree of p53protein expression was significantly correlated with that of tumor cell differentiation, invasion, metastasis and prognosis.

Effects of nanometer particles and water decoction of the Chinese medicine mixture of pinellia ternate and scorpion on P53 protein contents and apoptosis in the cerebral cortex and hippocampus of epileptic rats

BACKGROUND： Water decoction of the Chinese traditional medicine mixture of pinellia ternate and scorpion is an effective treatment for epilepsy. OBJECTIVE： To compare nanometer particles and effects of water decoction of Chinese traditional medicine mixture on P53 protein levels and apoptosis in the cerebral cortex and hippocampus of epileptic rats. DESIGN, TIME AND SETTING： This randomized, controlled molecular biology study was performed at the Key Laboratory of Child Neural Rehabilitation of Jiamusi University from October to December 2007. MATERIALS： Forty healthy male Wistar rats were used in this study. Convulsion rat models were established by intraperitoneal infusion of 35 mg/kg pentylenetetrazol, once a day, for 28 successive days. The Chinese traditional medicine mixture, comprising pinellia ternate, scorpion, centipede, bupleurum, peach pit and glycyrrhiza, was purchased from Beijing Tongrentang, China. The mixture was made into nanometer particles and water decoction. The apoptosis determination kit and P53 immunohistochemistry kit were bought from Boster, China. METHODS： Forty Wistar rats were randomly divided into four groups of ten rats per group, control, nanometer particle, water decoction and epileptic model groups. Rats in the nanometer particle and water decoction groups were respectively treated with 300 mg/kg Chinese herb nanometer particle suspension and water decoction by gavage, once a day, for 28 days. Rats in the epileptic model group were fed an equal volume of saline by gavage. Rats in the control group were only administered with the same volume of saline by gavage. MAIN OUTCOME MEASURES： Terminal deoxynucleotidyl Transferase Biotin-dUTP Nick End Labeling （TUNEL） and immunohistochemistry were used to respectively detect neuronal apoptosis and P53 protein expression in the rat brain cortex and hippocampus at 28 days following administration. RESULTS： The number of apoptotic neurons was lower in the nanometer particle and water decoction groups compared with the epileptic model group. The number of apoptotic cells and P53 protein expression in the rat cerebral cortex and hippocampus was greater in the epileptic model group compared with the control group （P 〈 0.05）, but lower in the nanometer particle and water decoction groups compared with the epileptic model group （P 〈 0.05）, and lower in the nanometer particle group compared with the water decoction group （P 〈 0.05）. CONCLUSION： Chinese traditional medicine mixture decreases neuronal apoptosis and P53 protein expression in epileptic rats. The effect of nanometer particles is significant compared with water decoction.

P^（53） PROTEIN OVEREXPRESSION IN PREMALIGNANT AND MALIGNANT LESIONS OF ORAL MUCOSA：IMMUNOHISTOCHEMICAL OBSERVATION

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构建P53介导的线粒体动力学失调预后模型及黄芪甲苷在乳腺癌中的抗肿瘤机制

目的 旨在通过构建抗肿瘤蛋白53(P53)可介导线粒体动力学失调相关mRNA在乳腺癌(BC)中的预后模型,探索其在BC中的预后价值及黄芪甲苷(AS-IV)在BC预后治疗中的潜在意义。方法 通过NCBIGENE数据库获得P53介导线粒体动力学相关mRNA,从癌症基因组图谱数据集获得BC的RNAseq数据和相应的临床信息,并筛选数据。使用“survival”包通过单变量Cox回归和Log-rank检验P53介导线粒体动力学在癌症基因组图谱中的预后价值mRNA。使用“glmnet”包应用LASSO-Cox回归分析构建预后模型。通过使用“ggcorrplot”包,评估风险组与免疫浸润人群间Pearson相关性分析。风险组基因进行京都基因与基因组百科全书通路富集分析。通过分子对接评估AS-IV与预后模型mRNA的结合能力。结果 P53介导线粒体动力学相关的XIAP、VDAC1、UNG、SOCS3、SIRT4、SERPINB5、SERPINA1、S100B、RB1、NOS2、NFKBIA、NDRG1、IRF1、IGF1R、HDAC2、FOXO3、FLT3、CASP918个mRNA构建了BC的预后模型,其中8个为高风险基因,10个为低风险基因。与低风险组患者相比,高风险组患者的总生存期更短(P<0.001);对接结果推断高风险评分蛋白受体XIAP、VDAC1、SIRT4、RB1、NOS2、NFKBIA与配体小分子AS-IV具有强烈的结合活性,潜在生物活性较高。结论 构建了18个mRNA-P53介导线粒体动力学相关的BC预后模型,并且可以作为一个独立的预后因素。AS-IV是通过作用于XIAP、VDAC1、SIRT4、RB1、NOS2、NFKBIAmRNA治疗BC潜在药物。

p53 MUTATIONS AND PROTEIN OVEREXPRESSION IN PRIMARY COLORECTAL CANCER AND ITS LIVER METASTASIS

Objective: To compare p53 status in primary and hepatic metastatic colorectal cancer in 34 patients. Methods: p53 gene status (exons 5–9) was examined by PCR, denaturing gradient gel electrophoresis (DGGE) and automated sequencing. P53 protein was detected by immunohistochemistry using monoclonal antibody DO-7. Results: p53 mutations were found in exons 5 through 9 in 21 of 34 patients (61.8%). Among them, 5 patients had mutation in liver metastasis but not in their primary tumors while in the other patients the same mutations were found in both primary and metastatic colorectal cancers. In no patients was p53 mutation exclusively found in the primary colorectal tumors. Moreover, additional mutation was detected in the metastatic lesions in two cases. Of the 37 mutations within the exons examined, 73% was missense mutation and 16% was nonsense mutation. There were 4 microinsertions. p53 protein was overexpressed in both primary and metastatic colorectal cancers with p53 gene mutations. The presence of p53 mutation significantly correlated with p53 protein accumulation (r=0.96,P<0.001). However, in 4 patients with p53 nonsense mutation, immunohistochemical staining was negative. In three patients who showed no p53 mutation of the primary tumor, p53 protein was consistently overexpressed. Conclusion: In colorectal cancers, p53 gene mutation usually appears first in the primary tumor and maintains as such but is more prominent when metastasized to the liver. However, p53 gene mutation may occur only after being metastasized. Although p53 gene mutation and p53 protein overexpression correlate with each other, either parameter examined alone may lead to false positive or negative results.

Association between HPV16/18 Infection and Expression of P53 protein in Laryngeal Papillomas

To understand the relationship between expression of P53 protein and HPV16/18 infection in laryngeal papillomas, PCR and immunohistochemical tech-niques were used to examine the paraffin-embedded tissue samples of laryngeal pa-pillomas from 35 subjects. HPV 16/18-DNA was found in 24 cases of laryngeal papillomas (68. 8 %). Overexpression of P53 protein was detected in 19 cases (54. 3 % ). Both HPV16/18-DNA and overexpression of P53 protein were demon-strated in 12 cases of laryngeal papillomas (34. 3 % ). Our results suggest that HPV16/l8 infection and P53 gene mutation are associated with pathogenesis of la-ryngeal papillomas. The relation between HPV infection and P53 mutation in tis-sues of laryngeal papillomas remains to be clarified.

THE STUDY ON RELATIONSHIP BETWEEN CIGARETTE SMOKING AND THE p53 PROTEIN AND P21 PROTEIN EXPRESSION IN NON-SMALL LUNG CANCER

This paper discusses the relationship between cigarette smoking and the p53 protein and P21 protein expression by the immunohistochemical analysis in 93 cases with lung cancer in which squamous cell carcinoma accounted for 45 cases, adenocarcinoma 48 cases. The results showed that positive proportion of p53 protein expression was 74.20% (28 of 37 squamous cell carcinoma, 21 of 30 adenocarcinomas) in cigarette smoking group with lung cancers, and 38.46% (3 of 8 squamous cell carcinoma, 7 of 18 adenocarcinomas) in nonsmoking group with lung cancers. The difference was statistically significant. Odds ratio was 4.14 and confidence limits for OR was 1.42-12.52. A dose-related presents in the p53 protein expression for the smoking amount and smoking years. The positive proportion of P21 protein expression was 79.31% (21 of 28 squamous cell carcinoma, 25 of 30 adenocarcinomas) in cigarette smoking group with lung cancers, and 82.75% (10 of 11 squamous, 14 of 18 adenocarcinomas) in nonsmoking group with lung cancers, the difference was not statistically significant. But their positive proportion of P21 protein expression were very high in both groups. It was indicated that no relationship between cigarette smoking and the P21 protein expression. We suggest that the p53 gene could be a common target of tobacco-associated carcinogenesis in lung cancer.

P^(53) FUSION PROTEIN EXPRESSION IN PROKARYOTE AND PREPARATION OF MONOCLONAL ANTIBODY TO P^(53)

Objective: Conventional immunohistochemistry (IHC) is available to assess P53 mutations, and expensive imported antiP53 monoclonal antibody has been used in China, it is necessary to study a new monoclonal antibody. Methods: The P53 DNA fragment enconding Nterminal 180 amiao acide was obtained by PCR and was cloned into PGEX2T plasmid expressing glutathione Stransferase (GST). The P53GST fusion protein expressed by JM109 was used for immunizing BALB/C mice. We have raised one hybridoma strain secreting McAb to human P53 (named M126). Results: The IHC analysis of 52 paraffinembedded sections from human breast cancer with M126 and PAB1801 (Zymed Co.) has showed that the positive immunoreactions were 25 cases (48%) and 22 cases (42.3%) respectively. The staining of M126 was stronger and preferable to PAB1801. Conclusion: M126 can be instead of PAB1801 for studying immunohistochemical analysis on P53 protein.

Study on the p53 Protein Expression in Gastric Cancer and Precancerous Lesions by Flow Cytometry

At present, p53 gene and its product p53 protein are the hot spot in the field of cancer research. 50% human malignant tumors are associated with p53 alteration. p53 gene mutation is the most common mutation, which can lead to regulation disturbance of cell proliferation. Gastric cancer is the most common disease in China. Its incidence is the second among various malignant tumors.There were reports about p53 protein expression and gastric cancer progression but few report on p53 protein expression in different stages of precancerous lesions was available. In this study,we analyzed p53 protein expression in gastric cancer and precancerous lesions by flow cytometry to evaluate the role of p53 protein in the pathogenesis of gastric cancer.