To investigate the relationship of bcl-2, p53, proliferating cell nuclear antigen (PCNA) to cell proliferation, apoptosis and pathological parameters, the patterns of cell growth and turnover in renal cell carcinoma (...To investigate the relationship of bcl-2, p53, proliferating cell nuclear antigen (PCNA) to cell proliferation, apoptosis and pathological parameters, the patterns of cell growth and turnover in renal cell carcinoma (RCC), formalin-fixed and paraffin-embedded tissue blocks from 34 patients with RCC were examined. Cell proliferation activity was detected by PCNA immunostaining and the proliferation index (PI) was expressed as a percentage of the PCNA-positive cells in the tumor cells. Apoptosis was detected by terminal deoxy- nucleotidyl transferase-mediated dUTP-biotin nick end labeling (TUNEL), and the apoptotic index (AI) was expressed as a percentage of the TUNEL-positive cells in the tumor cells. Expressions of bcl-2 and p53 were assessed immunohistochemically. Our results showed that the PI ranged from 6.0 % to 24.0 % (median 12.3 %) and the AI from 2.0 % to 8.0 % (median 5.4 %) in RCC. The expression of the bcl-2 protein was demonstrated in 15 cases (44.1 %); the expression of the p53 protein, however, was seen in only 3 case. bcl-2 positivity was not associated with PI or AI or any pathological parameters. There were close associations between PI and tumor grade and stage, and a significant relationship between AI and the tumor grade of RCC. Our study suggests that bcl-2 positivity was not associated with PI or AI or any pathological parameters. There are close associations between PI and AI and tumor grade and stage of RCC. Active cell proliferation may be accompanied by frequent apoptosis in RCC.展开更多
Objective To develop a rapid,highly sensitive quantitative method for detecting P24 antigen based on near-infrared fluorescent microsphere immunochromatography.Methods First,we prepared a lateral flow assay test strip...Objective To develop a rapid,highly sensitive quantitative method for detecting P24 antigen based on near-infrared fluorescent microsphere immunochromatography.Methods First,we prepared a lateral flow assay test strip,and labeled the detection antibody using a fluorescent microsphere.Second,we optimized the antibody labeling conditions.Third,we optimized the detection conditions.Fourth,we created a working curve.Fifth,we conducted a methodological assessment of the established fluorescent microsphere immunochromatography method.Sixty-six clinical samples were tested,and we compared the established fluorescent microsphere immunochromatography with the quantitative ELISA method.Results According to the working curve,the detection limit of the method is 3.4 pg/mL,and the detection range is 3.4 pg/mL to 10 ng/mL.The average intra-assay recovery was 99.6%,and the Coefficient of Variation(CV)was 5.4%–8.6%;the average inter-assay recovery was 97.3%,and the CV was 8.5%–11%.The detection rate of fluorescent microsphere immunochromatography was higher than ELISA method,and had a good correlation with ELISA.Conclusion The P24 antigen quantitative detection method based on near-infrared fluorescent microsphere immunochromatography has the advantages of rapid detection,high sensitivity,and wide detection range;thus,it is suitable for early clinical diagnosis and continuous monitoring of AIDS.展开更多
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 wit...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.展开更多
BACKGROUND Colorectal cancer(CRC) is a common malignancy of the gastrointestinal tract. The worldwide mortality rate of CRC is about one half of its morbidity. Ubiquitin is a key regulatory factor in the cell cycle an...BACKGROUND Colorectal cancer(CRC) is a common malignancy of the gastrointestinal tract. The worldwide mortality rate of CRC is about one half of its morbidity. Ubiquitin is a key regulatory factor in the cell cycle and widely exists in eukaryotes. Human leukocyte antigen F-associated transcript 10(FAT10), known as diubiquitin, is an 18 kDa protein with 29% and 36% homology with the N and C termini of ubiquitin. The function of FAT10 has not been fully elucidated, and some studies have shown that it plays an important role in various cell processes.AIM To examine FAT10 expression and to analyze the relationship between FAT10 expression and the clinicopathological parameters of CRC.METHODS FAT10 expression in 61 cases of CRC and para-cancer colorectal tissues was measured by immunohistochemistry and Western blotting. The relationship between FAT10 expression and clinicopathological parameters of CRC was statistically analyzed.RESULTS Immunohistochemical analysis showed that the positive rate of FAT10 expression in CRC(63.93%) was significantly higher than that in tumor-adjacent tissues(9.84%, P < 0.05) and normal colorectal mucosal tissue(1.64%, P < 0.05). Western blotting also indicated that FAT10 expression was significantly higher in CRC than in tumor-adjacent tissue(P < 0.05). FAT10 expression was closely associated with clinical stage and lymphatic spread of CRC. FAT10 expression also positively correlated with p53 expression.CONCLUSION FAT10 expression is highly upregulated in CRC. FAT10 expression is closely associated with clinical stage and lymphatic spread of CRC.展开更多
OBJECTIVE: To investigate the effect of inhibiting factor of cell cycle regulation p27<sup>kipl</sup>,retinoblastinoma protein (Rb protein), and proliferating cell nuclear antigen (PCNA) on the genesis...OBJECTIVE: To investigate the effect of inhibiting factor of cell cycle regulation p27<sup>kipl</sup>,retinoblastinoma protein (Rb protein), and proliferating cell nuclear antigen (PCNA) on the genesis andprogression of human pancreatic cancer.METHODS: The expression of p27<sup>kipl</sup>, Rb protein and PCNA in the tumor tissue and adjacent tissue of32 patients with pancreatic cancer was detected by SP immunohistochemical technique.RESULTS: The p27<sup>kipl</sup> protein positive-expression rate in the tumor tissue of pancreatic cancer was56.25%, which was lower than that in the adjacent pancreatic tissue (P【0.05). p27<sup>kipl</sup> proteinpositive-expression was correlated significantly with tumor cell differentiation and lymph node metastasis(P【0.05). The Rb gene protein positive-expression rate in the tumor tissue was 50%, which was alsolower than that in the adjacent pancreatic tissue (P【0.05 ). The PCNA positive-expression rate was71.87%, which was higher than that in the adjacent pancreatic tissue (P【0.05). PCNA positive-expression was also correlated significantly with tumor cell differentiation and lymph node metastasis(P【0.05).CONCLUSION: The decreased expression of p27<sup>kipl</sup>, Rb protein and over-expression of PCNA may playan important role in the genesis and progression of pancreatic cancer.展开更多
Objective: Colorectal cancer is one of the major contributors to cancer death worldwide. Lack of reliable colorectal cancer markers has hampered the management of these cancer patients. Our main purpose was to study ...Objective: Colorectal cancer is one of the major contributors to cancer death worldwide. Lack of reliable colorectal cancer markers has hampered the management of these cancer patients. Our main purpose was to study the correlation between histopathological variables of colorectal adenocarcinomas and identify histopathological markers that are of prognostic value in patients with colorectal cancer. Methods: In the present study, we examined the expression of carcinoembryonic antigen (CEA), p53, Ki-67 and glutathion Stransferase (GST) -n by using immunohistochemical staining methods in 126 colorectal carcinoma patients and evaluated the lymph node metastasis status in these patients by histopathological examination. Results: The positive rates of CEA, p53, Ki-67 and GST-π expression in the colorectal cancer tissue specimens examined were 95.23%, 55.56%, 53.38% and 82.30%, respectively. Expression of p53 and Ki-67 was significantly correlated with the Dukes stages of the tumor, with higher levels of these proteins in Dukes' C and D tumors than those in Dukes' A and B tumors. Furthermore, the expression of p53, GST-π and Ki-67 correlated with prognosis of patients with colorectal cancer. Additionally, the expression of p53 in colorectal cancer was closely related to the expression of Ki-67 and the expression of GST-π was directly correlated with that of p53. Conclusion: The expression of CEA, p53, Ki-67 and GST-π was correlated with various clinical features of patients with colorectal cancer. The combined use of these histopathological markers appeared to be a promising tool in predicting the prognosis of patients with this type of cancer.展开更多
We report a p24(HIV disease biomarker)detection assay using an MgO-based magnetic tunnel junction(MTJ)sensor and 20-nm magnetic nanoparticles.The MTJ array sensor with sensing area of 890×890μ2 possessing a sens...We report a p24(HIV disease biomarker)detection assay using an MgO-based magnetic tunnel junction(MTJ)sensor and 20-nm magnetic nanoparticles.The MTJ array sensor with sensing area of 890×890μ2 possessing a sensitivity of 1.39%/Oe was used to detect p24 antigens.It is demonstrated that the p24 antigens could be detected at a concentration of 0.01μg/ml.The development of bio-detection systems based on magnetic tunnel junction sensors with high-sensitivity will greatly benefit the early diagnosis of HIV.展开更多
Both proliferating cell nuclear antigen and P27 protein are important factors to regulate cell cycle. While, the combination of them can provide exactly objective markers to evaluate prognosis of patients with brain g...Both proliferating cell nuclear antigen and P27 protein are important factors to regulate cell cycle. While, the combination of them can provide exactly objective markers to evaluate prognosis of patients with brain glioma needs to be further studied based on pathological level. OBJECTIVE: To observe the expressions of proliferating cell nuclear antigen and P27 protein in both injured and normal brain glioma tissues and analyze the effect of them on onset and development of brain glioma. DESIGN: Case contrast observation. SETTING: Department of Neurosurgery, the Second Affiliated Hospital of Xi'an Jiaotong University. PARTICIPANTS: A total of 63 patients with brain glioma were selected from Department of Neurosurgery, the Second Affiliated Hospital of Xi'an Jiaotong University from July 1996 to June 2000. There were 38 males and 25 females and their ages ranged from 23 to 71 years. Based on pathological classification and grading standards of brain glioma, patients were divided into grade I - II (n=30) and grade III- IV (n = 33). All cases received one operation but no radiotherapy and chemiotherapy before operation. Sample tissues were collected from tumor parenchyma. Non-neoplastic brain tissues were collected from another 12 non-tumor subjects who received craniocerebral trauma infra-decompression and regarded as the control group. There were l0 males and 2 females and their ages ranged from 16 to 54 years. The experiment had got confirmed consent from local ethic committee and the collection was provided confirmed consent from patients and their relatives. All samples were restained with HE staining so as to diagnose as the brain glioma. While, all patients with brain glioma received radiotherapy after operation and their survival periods were followed up. METHODS: Primary lesion wax of brain glioma was cut into serial sections and stained with S-P immunohistochemical staining. Brown substance which was observed in tumor nucleus was regarded as the positive expressions of both proliferating cell nuclear antigen and P27 protein. Automatic imaging analytic system was used to quantitatively analyze staining results of tumor. MAIN OUTCOME MEASURES: To compare the expressions of proliferating cell nuclear antigen and P27 protein in brain glioma tissues and non-tumor brain tissues and investigate the effect of various sexes, ages, survival periods and severities on the expressions of them in brain tissues. RESULTS: There was no significant difference of sexes and ages in the expressions of proliferating cell nuclear antigen and P27 protein (P 〉 0.05); however, the expressions of proliferating cell nuclear antigen and P27 protein were milder in non-tumor brain tissues than those in the brain glioma tissues (P 〈 0.05). Expression of proliferating cell nuclear antigen in brain tissue of grade III- IV severity was stronger than that of grade I - II severity, and the expression in ≥ 5-year survival periods were also stronger than that in 〈 5-year survival periods (P 〈 0.05). In addition, expression of P27 protein in brain tissue of grade III- IV severity was stronger than that of grade I - II severity, and the expression in ≥ 5-year survival periods were also stronger than that in 〈 5-year survival periods (P 〈 0.05). CONCLUSION: Abnormal expressions of proliferating cell nuclear antigen and P27 protein in human brain glioma are closely related to onset, development and prognosis of tumor.展开更多
Objective: To study the role of SV40 early region gene coding product large tumor antigen(Tag) expression and the interaction between Tag and tumor suppressors p53 and pRb in human brain tumorigenesis. Methods: Tag wa...Objective: To study the role of SV40 early region gene coding product large tumor antigen(Tag) expression and the interaction between Tag and tumor suppressors p53 and pRb in human brain tumorigenesis. Methods: Tag was investigated by immunoprecipitation followed by silver staining and Western blot in 65 cases of human brain tumors and 8 cases of normal brain tissues. Tag-p53 and Tag-pRb complexes were screened by immunoprecipitation and Western blot in 18 and 15 Tag positive tumor tissues respectively. Results: SV40 Tag was expressed generally in human brain tumors, its positive rate was 66. 2% (43 /65). However, Eight normal brain tissues were all negative for Tag, there was significant difference between them(P < 0. 05). Tag-p53 complex was detected in all of 18 Tag positive tumors as well as Tag-pRb complex in all of 15 Tag positive tumors. Conclnsion: SV40 Tag expression is associated with human brain tumorigenesis. The inactivation of p53 and pRh due to the formation of Tag-p53 and Tag-pRb complexes is possibly an important mechanism in the etiopathogenesis of human brain tumors.展开更多
Axonal growth inhibitors are released during traumatic injuries to the adult mammalian central nervous system, including after spinal cord injury. These molecules accumulate at the injury site and form a highly inhibi...Axonal growth inhibitors are released during traumatic injuries to the adult mammalian central nervous system, including after spinal cord injury. These molecules accumulate at the injury site and form a highly inhibitory environment for axonal regeneration. Among these inhibitory molecules, myelinassociated inhibitors, including neurite outgrowth inhibitor A, oligodendrocyte myelin glycoprotein, myelin-associated glycoprotein, chondroitin sulfate proteoglycans and repulsive guidance molecule A are of particular importance. Due to their inhibitory nature, they represent exciting molecular targets to study axonal inhibition and regeneration after central injuries. These molecules are mainly produced by neurons, oligodendrocytes, and astrocytes within the scar and in its immediate vicinity. They exert their effects by binding to specific receptors, localized in the membranes of neurons. Receptors for these inhibitory cues include Nogo receptor 1, leucine-rich repeat, and Ig domain containing 1 and p75 neurotrophin receptor/tumor necrosis factor receptor superfamily member 19(that form a receptor complex that binds all myelin-associated inhibitors), and also paired immunoglobulin-like receptor B. Chondroitin sulfate proteoglycans and repulsive guidance molecule A bind to Nogo receptor 1, Nogo receptor 3, receptor protein tyrosine phosphatase σ and leucocyte common antigen related phosphatase, and neogenin, respectively. Once activated, these receptors initiate downstream signaling pathways, the most common amongst them being the Rho A/ROCK signaling pathway. These signaling cascades result in actin depolymerization, neurite outgrowth inhibition, and failure to regenerate after spinal cord injury. Currently, there are no approved pharmacological treatments to overcome spinal cord injuries other than physical rehabilitation and management of the array of symptoms brought on by spinal cord injuries. However, several novel therapies aiming to modulate these inhibitory proteins and/or their receptors are under investigation in ongoing clinical trials. Investigation has also been demonstrating that combinatorial therapies of growth inhibitors with other therapies, such as growth factors or stem-cell therapies, produce stronger results and their potential application in the clinics opens new venues in spinal cord injury treatment.展开更多
背景:肿瘤干细胞与肿瘤的复发、转移以及耐药等之间存在十分密切的联系。目的:探讨CD44^+CD24^(-/low)乳腺癌干细胞活性与多药耐药的相关性。方法:运用免疫磁珠法从多药耐药乳腺癌细胞株MCF-7/ADR中分选出CD44^+CD24^(-/low)乳腺癌干细...背景:肿瘤干细胞与肿瘤的复发、转移以及耐药等之间存在十分密切的联系。目的:探讨CD44^+CD24^(-/low)乳腺癌干细胞活性与多药耐药的相关性。方法:运用免疫磁珠法从多药耐药乳腺癌细胞株MCF-7/ADR中分选出CD44^+CD24^(-/low)乳腺癌干细胞。流式细胞仪测定分选后CD44^+CD24^(-/low)乳腺癌干细胞亚群比例和细胞膜P-gp荧光强度,RT-PCR法检测多药耐药基因MDR m RNA表达水平。结果与结论:(1)获得的CD44^+CD24^(-/low)乳腺癌干细胞比例在90%以上;(2)CD44^+CD24^(-/low)细胞亚群成球比例明显强于non-CD44^+CD24^(-/low)细胞亚群;(3)CD44^+CD24^(-/low)细胞亚群的细胞膜P-gp荧光强度显著高于MFC-7/ADR细胞株(P<0.05);(4)CD44^+CD24^(-/low)细胞亚群的MDR mRNA表达水平显著高于MFC-7/ADR细胞株(P<0.05);(5)结果表明,分选得到的CD44^+CD24^(-/low)乳腺癌干细胞具有很强的体外成球能力,高表达P-gp蛋白和MDR mRNA可能是导致多药耐药的原因之一。展开更多
文摘To investigate the relationship of bcl-2, p53, proliferating cell nuclear antigen (PCNA) to cell proliferation, apoptosis and pathological parameters, the patterns of cell growth and turnover in renal cell carcinoma (RCC), formalin-fixed and paraffin-embedded tissue blocks from 34 patients with RCC were examined. Cell proliferation activity was detected by PCNA immunostaining and the proliferation index (PI) was expressed as a percentage of the PCNA-positive cells in the tumor cells. Apoptosis was detected by terminal deoxy- nucleotidyl transferase-mediated dUTP-biotin nick end labeling (TUNEL), and the apoptotic index (AI) was expressed as a percentage of the TUNEL-positive cells in the tumor cells. Expressions of bcl-2 and p53 were assessed immunohistochemically. Our results showed that the PI ranged from 6.0 % to 24.0 % (median 12.3 %) and the AI from 2.0 % to 8.0 % (median 5.4 %) in RCC. The expression of the bcl-2 protein was demonstrated in 15 cases (44.1 %); the expression of the p53 protein, however, was seen in only 3 case. bcl-2 positivity was not associated with PI or AI or any pathological parameters. There were close associations between PI and tumor grade and stage, and a significant relationship between AI and the tumor grade of RCC. Our study suggests that bcl-2 positivity was not associated with PI or AI or any pathological parameters. There are close associations between PI and AI and tumor grade and stage of RCC. Active cell proliferation may be accompanied by frequent apoptosis in RCC.
基金supported by the National Natural Science Foundation of China[no.21677006]National Key Research and Development Project[2017YFC1200500].
文摘Objective To develop a rapid,highly sensitive quantitative method for detecting P24 antigen based on near-infrared fluorescent microsphere immunochromatography.Methods First,we prepared a lateral flow assay test strip,and labeled the detection antibody using a fluorescent microsphere.Second,we optimized the antibody labeling conditions.Third,we optimized the detection conditions.Fourth,we created a working curve.Fifth,we conducted a methodological assessment of the established fluorescent microsphere immunochromatography method.Sixty-six clinical samples were tested,and we compared the established fluorescent microsphere immunochromatography with the quantitative ELISA method.Results According to the working curve,the detection limit of the method is 3.4 pg/mL,and the detection range is 3.4 pg/mL to 10 ng/mL.The average intra-assay recovery was 99.6%,and the Coefficient of Variation(CV)was 5.4%–8.6%;the average inter-assay recovery was 97.3%,and the CV was 8.5%–11%.The detection rate of fluorescent microsphere immunochromatography was higher than ELISA method,and had a good correlation with ELISA.Conclusion The P24 antigen quantitative detection method based on near-infrared fluorescent microsphere immunochromatography has the advantages of rapid detection,high sensitivity,and wide detection range;thus,it is suitable for early clinical diagnosis and continuous monitoring of AIDS.
文摘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.
文摘BACKGROUND Colorectal cancer(CRC) is a common malignancy of the gastrointestinal tract. The worldwide mortality rate of CRC is about one half of its morbidity. Ubiquitin is a key regulatory factor in the cell cycle and widely exists in eukaryotes. Human leukocyte antigen F-associated transcript 10(FAT10), known as diubiquitin, is an 18 kDa protein with 29% and 36% homology with the N and C termini of ubiquitin. The function of FAT10 has not been fully elucidated, and some studies have shown that it plays an important role in various cell processes.AIM To examine FAT10 expression and to analyze the relationship between FAT10 expression and the clinicopathological parameters of CRC.METHODS FAT10 expression in 61 cases of CRC and para-cancer colorectal tissues was measured by immunohistochemistry and Western blotting. The relationship between FAT10 expression and clinicopathological parameters of CRC was statistically analyzed.RESULTS Immunohistochemical analysis showed that the positive rate of FAT10 expression in CRC(63.93%) was significantly higher than that in tumor-adjacent tissues(9.84%, P < 0.05) and normal colorectal mucosal tissue(1.64%, P < 0.05). Western blotting also indicated that FAT10 expression was significantly higher in CRC than in tumor-adjacent tissue(P < 0.05). FAT10 expression was closely associated with clinical stage and lymphatic spread of CRC. FAT10 expression also positively correlated with p53 expression.CONCLUSION FAT10 expression is highly upregulated in CRC. FAT10 expression is closely associated with clinical stage and lymphatic spread of CRC.
文摘OBJECTIVE: To investigate the effect of inhibiting factor of cell cycle regulation p27<sup>kipl</sup>,retinoblastinoma protein (Rb protein), and proliferating cell nuclear antigen (PCNA) on the genesis andprogression of human pancreatic cancer.METHODS: The expression of p27<sup>kipl</sup>, Rb protein and PCNA in the tumor tissue and adjacent tissue of32 patients with pancreatic cancer was detected by SP immunohistochemical technique.RESULTS: The p27<sup>kipl</sup> protein positive-expression rate in the tumor tissue of pancreatic cancer was56.25%, which was lower than that in the adjacent pancreatic tissue (P【0.05). p27<sup>kipl</sup> proteinpositive-expression was correlated significantly with tumor cell differentiation and lymph node metastasis(P【0.05). The Rb gene protein positive-expression rate in the tumor tissue was 50%, which was alsolower than that in the adjacent pancreatic tissue (P【0.05 ). The PCNA positive-expression rate was71.87%, which was higher than that in the adjacent pancreatic tissue (P【0.05). PCNA positive-expression was also correlated significantly with tumor cell differentiation and lymph node metastasis(P【0.05).CONCLUSION: The decreased expression of p27<sup>kipl</sup>, Rb protein and over-expression of PCNA may playan important role in the genesis and progression of pancreatic cancer.
基金supported by the Natural Sciences Basic Research Project,Education(08KJD310005)Department of Jiangsu Provincethe 5th"Six Talent-Person-Peak-Program",Jiangsu Province,ChinaThe progress main program fund of Nanjing Medical University 2007(nmu07002)
文摘Objective: Colorectal cancer is one of the major contributors to cancer death worldwide. Lack of reliable colorectal cancer markers has hampered the management of these cancer patients. Our main purpose was to study the correlation between histopathological variables of colorectal adenocarcinomas and identify histopathological markers that are of prognostic value in patients with colorectal cancer. Methods: In the present study, we examined the expression of carcinoembryonic antigen (CEA), p53, Ki-67 and glutathion Stransferase (GST) -n by using immunohistochemical staining methods in 126 colorectal carcinoma patients and evaluated the lymph node metastasis status in these patients by histopathological examination. Results: The positive rates of CEA, p53, Ki-67 and GST-π expression in the colorectal cancer tissue specimens examined were 95.23%, 55.56%, 53.38% and 82.30%, respectively. Expression of p53 and Ki-67 was significantly correlated with the Dukes stages of the tumor, with higher levels of these proteins in Dukes' C and D tumors than those in Dukes' A and B tumors. Furthermore, the expression of p53, GST-π and Ki-67 correlated with prognosis of patients with colorectal cancer. Additionally, the expression of p53 in colorectal cancer was closely related to the expression of Ki-67 and the expression of GST-π was directly correlated with that of p53. Conclusion: The expression of CEA, p53, Ki-67 and GST-π was correlated with various clinical features of patients with colorectal cancer. The combined use of these histopathological markers appeared to be a promising tool in predicting the prognosis of patients with this type of cancer.
基金President’s Fund of CUHKSZ,Longgang Key Laboratory of Applied Spintronics,at The Chinese University of Hong Kong,the National Natural Science Foundation of China(Grant Nos.11974298 and 61961136006)the Shenzhen Fundamental Research Fund,China(Grant No.JCYJ20170410171958839)Shenzhen Peacock Group Plan,China(Grant No.KQTD20180413181702403).
文摘We report a p24(HIV disease biomarker)detection assay using an MgO-based magnetic tunnel junction(MTJ)sensor and 20-nm magnetic nanoparticles.The MTJ array sensor with sensing area of 890×890μ2 possessing a sensitivity of 1.39%/Oe was used to detect p24 antigens.It is demonstrated that the p24 antigens could be detected at a concentration of 0.01μg/ml.The development of bio-detection systems based on magnetic tunnel junction sensors with high-sensitivity will greatly benefit the early diagnosis of HIV.
文摘Both proliferating cell nuclear antigen and P27 protein are important factors to regulate cell cycle. While, the combination of them can provide exactly objective markers to evaluate prognosis of patients with brain glioma needs to be further studied based on pathological level. OBJECTIVE: To observe the expressions of proliferating cell nuclear antigen and P27 protein in both injured and normal brain glioma tissues and analyze the effect of them on onset and development of brain glioma. DESIGN: Case contrast observation. SETTING: Department of Neurosurgery, the Second Affiliated Hospital of Xi'an Jiaotong University. PARTICIPANTS: A total of 63 patients with brain glioma were selected from Department of Neurosurgery, the Second Affiliated Hospital of Xi'an Jiaotong University from July 1996 to June 2000. There were 38 males and 25 females and their ages ranged from 23 to 71 years. Based on pathological classification and grading standards of brain glioma, patients were divided into grade I - II (n=30) and grade III- IV (n = 33). All cases received one operation but no radiotherapy and chemiotherapy before operation. Sample tissues were collected from tumor parenchyma. Non-neoplastic brain tissues were collected from another 12 non-tumor subjects who received craniocerebral trauma infra-decompression and regarded as the control group. There were l0 males and 2 females and their ages ranged from 16 to 54 years. The experiment had got confirmed consent from local ethic committee and the collection was provided confirmed consent from patients and their relatives. All samples were restained with HE staining so as to diagnose as the brain glioma. While, all patients with brain glioma received radiotherapy after operation and their survival periods were followed up. METHODS: Primary lesion wax of brain glioma was cut into serial sections and stained with S-P immunohistochemical staining. Brown substance which was observed in tumor nucleus was regarded as the positive expressions of both proliferating cell nuclear antigen and P27 protein. Automatic imaging analytic system was used to quantitatively analyze staining results of tumor. MAIN OUTCOME MEASURES: To compare the expressions of proliferating cell nuclear antigen and P27 protein in brain glioma tissues and non-tumor brain tissues and investigate the effect of various sexes, ages, survival periods and severities on the expressions of them in brain tissues. RESULTS: There was no significant difference of sexes and ages in the expressions of proliferating cell nuclear antigen and P27 protein (P 〉 0.05); however, the expressions of proliferating cell nuclear antigen and P27 protein were milder in non-tumor brain tissues than those in the brain glioma tissues (P 〈 0.05). Expression of proliferating cell nuclear antigen in brain tissue of grade III- IV severity was stronger than that of grade I - II severity, and the expression in ≥ 5-year survival periods were also stronger than that in 〈 5-year survival periods (P 〈 0.05). In addition, expression of P27 protein in brain tissue of grade III- IV severity was stronger than that of grade I - II severity, and the expression in ≥ 5-year survival periods were also stronger than that in 〈 5-year survival periods (P 〈 0.05). CONCLUSION: Abnormal expressions of proliferating cell nuclear antigen and P27 protein in human brain glioma are closely related to onset, development and prognosis of tumor.
基金National Natural Science Foundation of China!No.39470724
文摘Objective: To study the role of SV40 early region gene coding product large tumor antigen(Tag) expression and the interaction between Tag and tumor suppressors p53 and pRb in human brain tumorigenesis. Methods: Tag was investigated by immunoprecipitation followed by silver staining and Western blot in 65 cases of human brain tumors and 8 cases of normal brain tissues. Tag-p53 and Tag-pRb complexes were screened by immunoprecipitation and Western blot in 18 and 15 Tag positive tumor tissues respectively. Results: SV40 Tag was expressed generally in human brain tumors, its positive rate was 66. 2% (43 /65). However, Eight normal brain tissues were all negative for Tag, there was significant difference between them(P < 0. 05). Tag-p53 complex was detected in all of 18 Tag positive tumors as well as Tag-pRb complex in all of 15 Tag positive tumors. Conclnsion: SV40 Tag expression is associated with human brain tumorigenesis. The inactivation of p53 and pRh due to the formation of Tag-p53 and Tag-pRb complexes is possibly an important mechanism in the etiopathogenesis of human brain tumors.
基金a Ph D fellowship by FCT-Fundacao para a Ciência Tecnologia (SFRH/BD/135868/2018)(to SSC)。
文摘Axonal growth inhibitors are released during traumatic injuries to the adult mammalian central nervous system, including after spinal cord injury. These molecules accumulate at the injury site and form a highly inhibitory environment for axonal regeneration. Among these inhibitory molecules, myelinassociated inhibitors, including neurite outgrowth inhibitor A, oligodendrocyte myelin glycoprotein, myelin-associated glycoprotein, chondroitin sulfate proteoglycans and repulsive guidance molecule A are of particular importance. Due to their inhibitory nature, they represent exciting molecular targets to study axonal inhibition and regeneration after central injuries. These molecules are mainly produced by neurons, oligodendrocytes, and astrocytes within the scar and in its immediate vicinity. They exert their effects by binding to specific receptors, localized in the membranes of neurons. Receptors for these inhibitory cues include Nogo receptor 1, leucine-rich repeat, and Ig domain containing 1 and p75 neurotrophin receptor/tumor necrosis factor receptor superfamily member 19(that form a receptor complex that binds all myelin-associated inhibitors), and also paired immunoglobulin-like receptor B. Chondroitin sulfate proteoglycans and repulsive guidance molecule A bind to Nogo receptor 1, Nogo receptor 3, receptor protein tyrosine phosphatase σ and leucocyte common antigen related phosphatase, and neogenin, respectively. Once activated, these receptors initiate downstream signaling pathways, the most common amongst them being the Rho A/ROCK signaling pathway. These signaling cascades result in actin depolymerization, neurite outgrowth inhibition, and failure to regenerate after spinal cord injury. Currently, there are no approved pharmacological treatments to overcome spinal cord injuries other than physical rehabilitation and management of the array of symptoms brought on by spinal cord injuries. However, several novel therapies aiming to modulate these inhibitory proteins and/or their receptors are under investigation in ongoing clinical trials. Investigation has also been demonstrating that combinatorial therapies of growth inhibitors with other therapies, such as growth factors or stem-cell therapies, produce stronger results and their potential application in the clinics opens new venues in spinal cord injury treatment.
文摘背景:肿瘤干细胞与肿瘤的复发、转移以及耐药等之间存在十分密切的联系。目的:探讨CD44^+CD24^(-/low)乳腺癌干细胞活性与多药耐药的相关性。方法:运用免疫磁珠法从多药耐药乳腺癌细胞株MCF-7/ADR中分选出CD44^+CD24^(-/low)乳腺癌干细胞。流式细胞仪测定分选后CD44^+CD24^(-/low)乳腺癌干细胞亚群比例和细胞膜P-gp荧光强度,RT-PCR法检测多药耐药基因MDR m RNA表达水平。结果与结论:(1)获得的CD44^+CD24^(-/low)乳腺癌干细胞比例在90%以上;(2)CD44^+CD24^(-/low)细胞亚群成球比例明显强于non-CD44^+CD24^(-/low)细胞亚群;(3)CD44^+CD24^(-/low)细胞亚群的细胞膜P-gp荧光强度显著高于MFC-7/ADR细胞株(P<0.05);(4)CD44^+CD24^(-/low)细胞亚群的MDR mRNA表达水平显著高于MFC-7/ADR细胞株(P<0.05);(5)结果表明,分选得到的CD44^+CD24^(-/low)乳腺癌干细胞具有很强的体外成球能力,高表达P-gp蛋白和MDR mRNA可能是导致多药耐药的原因之一。