AIM: To study the effect of some genes especially those involved in cell cycle regulation on hepatocellular carcinoma. METHODS: Paraffin-embedded tissue samples of 25 patients (18 males and 7 females) with hepatocellu...AIM: To study the effect of some genes especially those involved in cell cycle regulation on hepatocellular carcinoma. METHODS: Paraffin-embedded tissue samples of 25 patients (18 males and 7 females) with hepatocellular carcinoma were collected from 22 pathology centers in Tehran during 2000-2001, and stained using immunohistochemistry method (avidin-biotin-peroxidase) for detection of p53, cyclinD1, RB1, c-fos and N-ras proteins. RESULTS: Six (24%), 5 (20%), 12 (48%) and 2 samples (8%) were positive for p53, cyclinD1, C-fos and N-ras expression, respectively. Twenty-two (88%) samples had alterations in the G1 cell-cycle checkpoint protein expression (RB1 or cyclinD1). P53 positive samples showed a higher (9 times) risk of being positive for RB1 protein than p53 negative samples. Loss of expression of RB1 in association with p53 over-expression was observed in 4 (66.7%) of 6 samples. Loss of expression of RB1 was seen in all cyclinD1 positive, 20 (90.9%) N-ras negative, and 11 (50%) C-fos positive samples, respectively. CyclinD1 positive samples showed a higher (2.85 and 4.75 times) risk of being positive for c-fos and N-ras expression than cyclinD1 negative samples. CONCLUSION: The expression of p53, RB1 and c-fos genes appears to have a key role in the pathogenesis of hepatocellular carcinoma in Iran. Simultaneous overexpression of these genes is significantly associated with their loss of expression during development of hepatocellular carcinoma.展开更多
BACKGROUND: Ischemia/reperfusion is the main cause of hepatic damage in liver transplantation. Immediate early genes (IEGs) encode proteins can regulate expression of cellular response genes after injury, and is assoc...BACKGROUND: Ischemia/reperfusion is the main cause of hepatic damage in liver transplantation. Immediate early genes (IEGs) encode proteins can regulate expression of cellular response genes after injury, and is associated with tissue repair and cell apoptosis. The purpose of this re- search was to investigate the effects of preconditioning on expression of immediate early genes c-fos and c-jun follow- ing hepatic ischemia/reperfusion (IR) and its roles in cellu- lar regeneration and apoptosis. METHODS: Ninety-six Wistar rats were randomly divided into IR group and hepatic ischemic preconditioning (IPC) group, and each group was further divided into eight sub- groups (n =6). The model of partial liver ischemia/reper- fusion was used. The rats were subjected to 60-minute liver ischemia, preceded by 10-minute preconditioning. After 0-, 0.5-, 1-, 2-, 4-, 8-, 12-, 24-hour reperfusion, the se- rum and liver tissue in each group were collected to detect the level of serum ALT/AST, liver histopathology, expres- sion of c-fos, and c-jun mRNA. Flow cytometer was used to detect Ki67 and Sub-G1 as the quantity indicators of cell regeneration and apoptosis respectively. RESULTS: Compared with IR group, IPC group showed a significantly lower ALT/AST level in 0. 5-hour sub-group to 8-hour sub-group (P<0.05). Ki67 elevated significantly at 0.5, 1, 2 hours, but decreased significantly at 24 hours ( P < 0 . 05). Ap index decreased significantly after 1-hour reperfusion(P<0.05). Expressions of c-fos and c-jun mR- NA were low, especially c-jun at 0.5, 1 and 2 hours after reperfusion. CONCLUSION: Ischemic preconditioning can protect liver cells against ischemia/reperfusion injury, and this protec- tive effect may be related to influence transcription levels of c-fos and c-jun.展开更多
Objective: This study was designed to determinewhether regulatory regions p250 of c-fos gene wereresponsive to SeO2 and to seek the possible mechanisms of regulation. Methods: HeLa cells were transfected withplasmids...Objective: This study was designed to determinewhether regulatory regions p250 of c-fos gene wereresponsive to SeO2 and to seek the possible mechanisms of regulation. Methods: HeLa cells were transfected withplasmids p250-tk CAT containing upstream regulatingregions of c-fos gene. Cells were treated by SeO2 for 20 min. CAT expression in transfected cells was observed by thinlayered chromatography. Results: In transfected HeLa cells CAT expression showed obvious increase after exposure to SeO2, especially in 10 mmol/L and 30 mmol/L group (P<0.05). Conclusion: Through affecting regulatory regions p250 of c-fos gene, SeO2 exerted biological effect on tumor cells. SeO2possibly had anti-tumor effects.展开更多
目的:探讨便秘型肠易激综合征(C-IBS)大鼠模型对直肠球囊扩张的内脏敏感性改变和脊髓背角5-羟色胺(5-HT)、c-fos的分布和异常表达.方法:C-IBS大鼠模型组应用冰水ig方法建立(A组,n=10),和正常对照大鼠(B组,n=10).所有大鼠给予直肠内球囊...目的:探讨便秘型肠易激综合征(C-IBS)大鼠模型对直肠球囊扩张的内脏敏感性改变和脊髓背角5-羟色胺(5-HT)、c-fos的分布和异常表达.方法:C-IBS大鼠模型组应用冰水ig方法建立(A组,n=10),和正常对照大鼠(B组,n=10).所有大鼠给予直肠内球囊扩张,检测球囊扩张引起腹部收缩反射的最小容量阈值及球囊不同容量扩张时腹部收缩反射的次数.腰骶段脊髓背角5-HT和c-fos表达应用免疫组织化学染色及计算机图像分析系统半定量进行分析.结果:直肠内球囊扩张时,A组引起腹部收缩的最小容量阈值略高于B组,无明显统计学差并(0.59±0.09 vs 0.57±0.13,P>0.05).直肠球囊扩张体积1.0mL时A组腹部收缩反射次数低于B组(10.3±3.3 vs 18.3±5.5,P<0.05);体积1.5和2.0mL高容量扩张时两组无明显差异(P>0.05).A组腰骶段脊髓背角5-HT、c-fos阳性神经组织的面积均明显高于B组(5-HT面积:146.5±15.1 vs 109.3±18.5;5-HT OD:45826±2563.2 vs 29358±8965.5:c-fos面积:125.4±23.3 vs 88.7±23.2;c-fos OD:46258±4642 vs 33238±4587;均P<0.05).结论:C-IBS大鼠模型存在对直肠球囊扩张的内脏敏感性异常,脊髓背角5-HT、c-fos的异常表达可能参与C-IBS大鼠内脏敏感性异常的调节.展开更多
文摘AIM: To study the effect of some genes especially those involved in cell cycle regulation on hepatocellular carcinoma. METHODS: Paraffin-embedded tissue samples of 25 patients (18 males and 7 females) with hepatocellular carcinoma were collected from 22 pathology centers in Tehran during 2000-2001, and stained using immunohistochemistry method (avidin-biotin-peroxidase) for detection of p53, cyclinD1, RB1, c-fos and N-ras proteins. RESULTS: Six (24%), 5 (20%), 12 (48%) and 2 samples (8%) were positive for p53, cyclinD1, C-fos and N-ras expression, respectively. Twenty-two (88%) samples had alterations in the G1 cell-cycle checkpoint protein expression (RB1 or cyclinD1). P53 positive samples showed a higher (9 times) risk of being positive for RB1 protein than p53 negative samples. Loss of expression of RB1 in association with p53 over-expression was observed in 4 (66.7%) of 6 samples. Loss of expression of RB1 was seen in all cyclinD1 positive, 20 (90.9%) N-ras negative, and 11 (50%) C-fos positive samples, respectively. CyclinD1 positive samples showed a higher (2.85 and 4.75 times) risk of being positive for c-fos and N-ras expression than cyclinD1 negative samples. CONCLUSION: The expression of p53, RB1 and c-fos genes appears to have a key role in the pathogenesis of hepatocellular carcinoma in Iran. Simultaneous overexpression of these genes is significantly associated with their loss of expression during development of hepatocellular carcinoma.
文摘BACKGROUND: Ischemia/reperfusion is the main cause of hepatic damage in liver transplantation. Immediate early genes (IEGs) encode proteins can regulate expression of cellular response genes after injury, and is associated with tissue repair and cell apoptosis. The purpose of this re- search was to investigate the effects of preconditioning on expression of immediate early genes c-fos and c-jun follow- ing hepatic ischemia/reperfusion (IR) and its roles in cellu- lar regeneration and apoptosis. METHODS: Ninety-six Wistar rats were randomly divided into IR group and hepatic ischemic preconditioning (IPC) group, and each group was further divided into eight sub- groups (n =6). The model of partial liver ischemia/reper- fusion was used. The rats were subjected to 60-minute liver ischemia, preceded by 10-minute preconditioning. After 0-, 0.5-, 1-, 2-, 4-, 8-, 12-, 24-hour reperfusion, the se- rum and liver tissue in each group were collected to detect the level of serum ALT/AST, liver histopathology, expres- sion of c-fos, and c-jun mRNA. Flow cytometer was used to detect Ki67 and Sub-G1 as the quantity indicators of cell regeneration and apoptosis respectively. RESULTS: Compared with IR group, IPC group showed a significantly lower ALT/AST level in 0. 5-hour sub-group to 8-hour sub-group (P<0.05). Ki67 elevated significantly at 0.5, 1, 2 hours, but decreased significantly at 24 hours ( P < 0 . 05). Ap index decreased significantly after 1-hour reperfusion(P<0.05). Expressions of c-fos and c-jun mR- NA were low, especially c-jun at 0.5, 1 and 2 hours after reperfusion. CONCLUSION: Ischemic preconditioning can protect liver cells against ischemia/reperfusion injury, and this protec- tive effect may be related to influence transcription levels of c-fos and c-jun.
文摘Objective: This study was designed to determinewhether regulatory regions p250 of c-fos gene wereresponsive to SeO2 and to seek the possible mechanisms of regulation. Methods: HeLa cells were transfected withplasmids p250-tk CAT containing upstream regulatingregions of c-fos gene. Cells were treated by SeO2 for 20 min. CAT expression in transfected cells was observed by thinlayered chromatography. Results: In transfected HeLa cells CAT expression showed obvious increase after exposure to SeO2, especially in 10 mmol/L and 30 mmol/L group (P<0.05). Conclusion: Through affecting regulatory regions p250 of c-fos gene, SeO2 exerted biological effect on tumor cells. SeO2possibly had anti-tumor effects.
文摘目的:探讨便秘型肠易激综合征(C-IBS)大鼠模型对直肠球囊扩张的内脏敏感性改变和脊髓背角5-羟色胺(5-HT)、c-fos的分布和异常表达.方法:C-IBS大鼠模型组应用冰水ig方法建立(A组,n=10),和正常对照大鼠(B组,n=10).所有大鼠给予直肠内球囊扩张,检测球囊扩张引起腹部收缩反射的最小容量阈值及球囊不同容量扩张时腹部收缩反射的次数.腰骶段脊髓背角5-HT和c-fos表达应用免疫组织化学染色及计算机图像分析系统半定量进行分析.结果:直肠内球囊扩张时,A组引起腹部收缩的最小容量阈值略高于B组,无明显统计学差并(0.59±0.09 vs 0.57±0.13,P>0.05).直肠球囊扩张体积1.0mL时A组腹部收缩反射次数低于B组(10.3±3.3 vs 18.3±5.5,P<0.05);体积1.5和2.0mL高容量扩张时两组无明显差异(P>0.05).A组腰骶段脊髓背角5-HT、c-fos阳性神经组织的面积均明显高于B组(5-HT面积:146.5±15.1 vs 109.3±18.5;5-HT OD:45826±2563.2 vs 29358±8965.5:c-fos面积:125.4±23.3 vs 88.7±23.2;c-fos OD:46258±4642 vs 33238±4587;均P<0.05).结论:C-IBS大鼠模型存在对直肠球囊扩张的内脏敏感性异常,脊髓背角5-HT、c-fos的异常表达可能参与C-IBS大鼠内脏敏感性异常的调节.
