INTRODUCTIONApoptosis,described by Kerr in 1972,plays a keyrole in all types of regulated cellular processes inmulticellular,organisms.It is defined as amorphologic change,including fragmentation of theDNA,cell shrink...INTRODUCTIONApoptosis,described by Kerr in 1972,plays a keyrole in all types of regulated cellular processes inmulticellular,organisms.It is defined as amorphologic change,including fragmentation of theDNA,cell shrinkage,dilation of the endoplasmaticreticulum,cell fragmentation and formation展开更多
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 a...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 .展开更多
AIM: To clone the cDNA fragment of human TRAIL (TNF-related apoptosis inducing ligand) into a tetracycline-regulated gene expression system, the RevTet-On system, transduce expression vectors into a gastric carcinoma ...AIM: To clone the cDNA fragment of human TRAIL (TNF-related apoptosis inducing ligand) into a tetracycline-regulated gene expression system, the RevTet-On system, transduce expression vectors into a gastric carcinoma cell line-NCI-N87 and examine the effects of controlled expression of TRAIL in vitro on the gastric carcinoma cells. METHODS: The full-length cDNA of TRAIL was inserted into a vector under the control of the tetracycline-responsive element (TRE) to obtain the plasmid pRevTRE-TRAIL, which was transfected into a packaging cell line PT67. In addition, vector pRev-Tet On and pRevTRE were also transfected into PT67 separately. After hygromycin and G418 selection, the viral titer was determined. The medium containing retroviral vectors was collected and used to transduce a gastric carcinoma cell line NCI-N87. The resulting cell line NCI-N87-Tet On TRE-TRAIL and a control cell line, NCI-N87 Tet On-TRE, were established. TRAIL expression in the cell line was induced by incubating cells with doxycycline (Dox), which is a tetracycline analogue. The killing effect on gastric carcinoma cells was analyzed after induction. RESULTS: The recombinant plasmid pRev-TRE-TRAIL was constructed. After hygromycin or G418 selection, the producer cell lines PT67-TRE, PT67-TRE-TRAIL and PT67-Tet On were obtained,with titers of about 10(8)CFU.L(-1). By transducing NCI-N87 cells with retroviral vectors from these cell lines, stable cell lines NCI-N87-Tet-On TRE-TRAIL (NN3T) and control cell line NCI-N87-Tet-On-TRE (NN2T) were established. The growth curves of the selected cell lines were the same with the wild type NCI-N87. When Dox was added, cell death was obvious in the test groups (29%-77%), whereas no difference was observed in control and wild type cell lines. With the addition of a medium from the test group, human leukemia cell line Jurkat was activated till death (83%), indicating the secretion of active TRAIL proteins from the test cells to the medium. CONCLUSION: With the use of the RevTet-On system, a regulated expression system for TRAIL was constructed. Using this system, the selected killing effect of TRAIL on gastric carcinoma cell line NCI-N87 could be observed.展开更多
AIMS To elucidate the biological and clinicopathological signifi- cance of neuroendocrine(NE)cells in gastric carcinoma(GC). METHODS One hundred and eighty-nine cases of various histo- logical types of GC were observe...AIMS To elucidate the biological and clinicopathological signifi- cance of neuroendocrine(NE)cells in gastric carcinoma(GC). METHODS One hundred and eighty-nine cases of various histo- logical types of GC were observed using light microscopy, histochemistry,immunohistochemistry and electron microscopy. Of them 127 patients were followed up. RESULTS Chromogranin A(CgA)positive GC was demonstrat- ed in 85 cases(45.0%).The typos of NE cells in GC were probed using 9 kinds of hormone antibodies 49 cases(67.2%) contained more than one hormone.NE cells were found more often in poorly differentiated GC than in well differentiated ones(P<0. 01).Expression of some kinds of hormone Was relative to the dif- ferentiation and histological types of GC.BOM,CT(P<0.01) GAST and 5-HT(P<0.05)were more expressed in poorly differ- entiated cases than in well defferentiated ones.Nineteen cases of the matastatic foci in regional lymph nodes were found to have CgA positive cancer cells.The presence of HCG in matastatic lymph nodes was more often observed than that of other hormone (P<0.01).The survival rate of patients with NE positive GC was 38.9% and negative GC 52.7%.Five of 7 patients(71. 4%)with somatostatin positive GC still survived at follow up of 33-66 months,but 4 patients with HCG positive GC died in 12-29 months. CONCLUSIONS The NE cells occur more frequently in poorly differentiated GC.Certain hormones appear to be related to the metastasis and prognosis.展开更多
AIMS To study the pathologic classification of gastric neuroendocrine tumors and its clinicopathologic significance. METHODS Paraffin embedded sections of 52 gastric neuroendocrine tumors including 42 carcinoid tu...AIMS To study the pathologic classification of gastric neuroendocrine tumors and its clinicopathologic significance. METHODS Paraffin embedded sections of 52 gastric neuroendocrine tumors including 42 carcinoid tumors, and 10 cases of neuroendocrine carcinoma from 326 patients who underwent resection of stomach carcinomas were studied by immunohistochemical methods including 10 endocrine markers or hormones antibodies and endocrine cells in gastric neuroendocrine tumors and extratumoral mucosa were observed under electromicroscope. RESULTS The 52 gastric neuroendocrine tumors were divided into three types: ① Gastrin dependent type of carcinoid (26 cases) accompanied by chronic atrophic gastritis (CAG) and tumor extension limited to the mucosa or submucosa complicated with hypergastrinemia and G cell hyperplasia. This type was consistently preceded by and associated with generalized proliferation of endocrine cells in the extratomoral fundic mucosa. ② Non gastrin dependent type of carcinoids (16 cases) associated with neither CAG nor hypergastrinemia. This type was more aggressive; and ③ Neuroendocrie carcinomas (10 cases), which are highly aggressive tumors. CONCLUSIONS A correct identification of different types of gastric endocrine tumors has major implications for the treatment and prognosis of the patients.展开更多
Objective： To evaluate the relationship between the expressions of cyclin D1 and p27^kip1 in the canceration course of the stomach. Methods： The immunohistochemical staining technique （SP method） was used to detec...Objective： To evaluate the relationship between the expressions of cyclin D1 and p27^kip1 in the canceration course of the stomach. Methods： The immunohistochemical staining technique （SP method） was used to detect the expressions of cyclin D1, p27^kip1 in chronic superficial gastritis （CSG）, chronic atrophic gastritis （CAG）, intestinal metaplasia （IM）, dysplasia （DYS）, gastric carcinoma （GCA） biopsy specimens. Results： The positive cyclin D1 expression rates increased with the progressing from CAG--,IM--,DYS--,GCA respectively, and those in IM, DYS and GCA were different from those in CSG, P 〈 0.05, while DYS group was indifferent from GCA group, P 〉 0.05. The positive p27^kip1 expression rates decreased with the mucosa progressing from CAG→IM→DYS→GCA. There was a negative correlation between the expression cyclin D1 and p27^kip1 （y = -0.53, P = 0.000）. Conclusion： Expression rates of cyclin D1 in the canceration course of the stomach mucosa trend were increased and those of p27^kip1 were decreased; the abnormal expressions of them were found in the early term of the canceration course of the stomach mucosa, and the inverse expression suggests there may be a negative feedback regulatory loop between cyclin D1 and p27^kip1.展开更多
目的：探讨胃癌组织中程序性细胞死亡因子4（programmed cell death 4，PDCD4）的表达及其临床病理学意义。方法：应用免疫组织化学和Western印迹杂交研究方法检测61例胃癌组织中PDCD4的表达，观察其与胃癌临床病理学参数之间的关系。...目的：探讨胃癌组织中程序性细胞死亡因子4（programmed cell death 4，PDCD4）的表达及其临床病理学意义。方法：应用免疫组织化学和Western印迹杂交研究方法检测61例胃癌组织中PDCD4的表达，观察其与胃癌临床病理学参数之间的关系。结果：免疫组化染色显示，在正常胃组织中，阳性细胞比例均在80％以上。61例胃癌中，PDCD4低表达者（阳性细胞比例〈30％）占65．6％（40／61），高表达（阳性细胞比例介于30％～80％）者占34．4％（21／61）。Western印迹分析结果显示，同癌旁正常组织相比，所有胃癌组织PDCD4蛋白表达均明显下调。相关分析表明，PDCD4表达下调或缺失与肿瘤的不良分化相关，P〈0．01，而与性别、年龄厦肿瘤的TNM分期无关。结论：PDCD4蛋白在胃癌中多呈低表达，并与胃癌的分化程度有关，在胃癌的发生、发展过程中起重要作用。展开更多
基金a grant from the Science and Technology Committee of Jiangsu Province,No.BJ98110
文摘INTRODUCTIONApoptosis,described by Kerr in 1972,plays a keyrole in all types of regulated cellular processes inmulticellular,organisms.It is defined as amorphologic change,including fragmentation of theDNA,cell shrinkage,dilation of the endoplasmaticreticulum,cell fragmentation and formation
基金Supported by the Medical Research Foundation of Guangdong Province,No.1997423
文摘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 .
基金the National Natural Science Foundation of China,No.39870850
文摘AIM: To clone the cDNA fragment of human TRAIL (TNF-related apoptosis inducing ligand) into a tetracycline-regulated gene expression system, the RevTet-On system, transduce expression vectors into a gastric carcinoma cell line-NCI-N87 and examine the effects of controlled expression of TRAIL in vitro on the gastric carcinoma cells. METHODS: The full-length cDNA of TRAIL was inserted into a vector under the control of the tetracycline-responsive element (TRE) to obtain the plasmid pRevTRE-TRAIL, which was transfected into a packaging cell line PT67. In addition, vector pRev-Tet On and pRevTRE were also transfected into PT67 separately. After hygromycin and G418 selection, the viral titer was determined. The medium containing retroviral vectors was collected and used to transduce a gastric carcinoma cell line NCI-N87. The resulting cell line NCI-N87-Tet On TRE-TRAIL and a control cell line, NCI-N87 Tet On-TRE, were established. TRAIL expression in the cell line was induced by incubating cells with doxycycline (Dox), which is a tetracycline analogue. The killing effect on gastric carcinoma cells was analyzed after induction. RESULTS: The recombinant plasmid pRev-TRE-TRAIL was constructed. After hygromycin or G418 selection, the producer cell lines PT67-TRE, PT67-TRE-TRAIL and PT67-Tet On were obtained,with titers of about 10(8)CFU.L(-1). By transducing NCI-N87 cells with retroviral vectors from these cell lines, stable cell lines NCI-N87-Tet-On TRE-TRAIL (NN3T) and control cell line NCI-N87-Tet-On-TRE (NN2T) were established. The growth curves of the selected cell lines were the same with the wild type NCI-N87. When Dox was added, cell death was obvious in the test groups (29%-77%), whereas no difference was observed in control and wild type cell lines. With the addition of a medium from the test group, human leukemia cell line Jurkat was activated till death (83%), indicating the secretion of active TRAIL proteins from the test cells to the medium. CONCLUSION: With the use of the RevTet-On system, a regulated expression system for TRAIL was constructed. Using this system, the selected killing effect of TRAIL on gastric carcinoma cell line NCI-N87 could be observed.
文摘AIMS To elucidate the biological and clinicopathological signifi- cance of neuroendocrine(NE)cells in gastric carcinoma(GC). METHODS One hundred and eighty-nine cases of various histo- logical types of GC were observed using light microscopy, histochemistry,immunohistochemistry and electron microscopy. Of them 127 patients were followed up. RESULTS Chromogranin A(CgA)positive GC was demonstrat- ed in 85 cases(45.0%).The typos of NE cells in GC were probed using 9 kinds of hormone antibodies 49 cases(67.2%) contained more than one hormone.NE cells were found more often in poorly differentiated GC than in well differentiated ones(P<0. 01).Expression of some kinds of hormone Was relative to the dif- ferentiation and histological types of GC.BOM,CT(P<0.01) GAST and 5-HT(P<0.05)were more expressed in poorly differ- entiated cases than in well defferentiated ones.Nineteen cases of the matastatic foci in regional lymph nodes were found to have CgA positive cancer cells.The presence of HCG in matastatic lymph nodes was more often observed than that of other hormone (P<0.01).The survival rate of patients with NE positive GC was 38.9% and negative GC 52.7%.Five of 7 patients(71. 4%)with somatostatin positive GC still survived at follow up of 33-66 months,but 4 patients with HCG positive GC died in 12-29 months. CONCLUSIONS The NE cells occur more frequently in poorly differentiated GC.Certain hormones appear to be related to the metastasis and prognosis.
文摘AIMS To study the pathologic classification of gastric neuroendocrine tumors and its clinicopathologic significance. METHODS Paraffin embedded sections of 52 gastric neuroendocrine tumors including 42 carcinoid tumors, and 10 cases of neuroendocrine carcinoma from 326 patients who underwent resection of stomach carcinomas were studied by immunohistochemical methods including 10 endocrine markers or hormones antibodies and endocrine cells in gastric neuroendocrine tumors and extratumoral mucosa were observed under electromicroscope. RESULTS The 52 gastric neuroendocrine tumors were divided into three types: ① Gastrin dependent type of carcinoid (26 cases) accompanied by chronic atrophic gastritis (CAG) and tumor extension limited to the mucosa or submucosa complicated with hypergastrinemia and G cell hyperplasia. This type was consistently preceded by and associated with generalized proliferation of endocrine cells in the extratomoral fundic mucosa. ② Non gastrin dependent type of carcinoids (16 cases) associated with neither CAG nor hypergastrinemia. This type was more aggressive; and ③ Neuroendocrie carcinomas (10 cases), which are highly aggressive tumors. CONCLUSIONS A correct identification of different types of gastric endocrine tumors has major implications for the treatment and prognosis of the patients.
文摘Objective： To evaluate the relationship between the expressions of cyclin D1 and p27^kip1 in the canceration course of the stomach. Methods： The immunohistochemical staining technique （SP method） was used to detect the expressions of cyclin D1, p27^kip1 in chronic superficial gastritis （CSG）, chronic atrophic gastritis （CAG）, intestinal metaplasia （IM）, dysplasia （DYS）, gastric carcinoma （GCA） biopsy specimens. Results： The positive cyclin D1 expression rates increased with the progressing from CAG--,IM--,DYS--,GCA respectively, and those in IM, DYS and GCA were different from those in CSG, P 〈 0.05, while DYS group was indifferent from GCA group, P 〉 0.05. The positive p27^kip1 expression rates decreased with the mucosa progressing from CAG→IM→DYS→GCA. There was a negative correlation between the expression cyclin D1 and p27^kip1 （y = -0.53, P = 0.000）. Conclusion： Expression rates of cyclin D1 in the canceration course of the stomach mucosa trend were increased and those of p27^kip1 were decreased; the abnormal expressions of them were found in the early term of the canceration course of the stomach mucosa, and the inverse expression suggests there may be a negative feedback regulatory loop between cyclin D1 and p27^kip1.
文摘目的：探讨胃癌组织中程序性细胞死亡因子4（programmed cell death 4，PDCD4）的表达及其临床病理学意义。方法：应用免疫组织化学和Western印迹杂交研究方法检测61例胃癌组织中PDCD4的表达，观察其与胃癌临床病理学参数之间的关系。结果：免疫组化染色显示，在正常胃组织中，阳性细胞比例均在80％以上。61例胃癌中，PDCD4低表达者（阳性细胞比例〈30％）占65．6％（40／61），高表达（阳性细胞比例介于30％～80％）者占34．4％（21／61）。Western印迹分析结果显示，同癌旁正常组织相比，所有胃癌组织PDCD4蛋白表达均明显下调。相关分析表明，PDCD4表达下调或缺失与肿瘤的不良分化相关，P〈0．01，而与性别、年龄厦肿瘤的TNM分期无关。结论：PDCD4蛋白在胃癌中多呈低表达，并与胃癌的分化程度有关，在胃癌的发生、发展过程中起重要作用。
