Monoclonal antibody (MAb) to rat liver cyto-chrome P-450j isozyme, an activating enzyme specific to nitrosamine metabolism, was used coupled with immunoblotting, densitometer scanning of SDS-PAGE gels and immunohistoc...Monoclonal antibody (MAb) to rat liver cyto-chrome P-450j isozyme, an activating enzyme specific to nitrosamine metabolism, was used coupled with immunoblotting, densitometer scanning of SDS-PAGE gels and immunohistochemical technique. The trace P-450HSj isozyme (Mr. 51.5 Kd) was found in human gastric mucosa. It was similar to P-450j in molecular weight, catalytic and immunochemical properties. The concentrations of P-450HSj in mucosa of lesser curvature were higher than those in greater curvature. This might be one of the important reasons that lesser curvature is the commonest area for gastric carcinoma. But there was possibly less P-450HSj in gastric mucosa with cancer. Im-munohistochemically, P-450HSj was discovered in the cytoplasm of some glandular epithelial cells, especially in the glands with hyperplastic and intestinal metaplastic changes adjacent to carcinoma. It was also found in some normal glands and in tumor cells of high-differentiated adenocarcinoma, but not in those of low-differentiated ones. Following subjects are discussed: (1) the method of detecting trace P-450HSj, (2) the rule of distribution of P-450HSj, and (3) the relationship between the isozyme and the occurrence of gastric cancer caused by nitrosa-mines.展开更多
Objective To localize cytochrome P450 enzymes 4A and 2C in central nervous cells of normal male rats.Methods Eight drug/alcohol untreated normal male rats (150-200 g of body weight) were treated by the optimized perfu...Objective To localize cytochrome P450 enzymes 4A and 2C in central nervous cells of normal male rats.Methods Eight drug/alcohol untreated normal male rats (150-200 g of body weight) were treated by the optimized perfusion technique, then brain tissues were postfixed, paraffin-embedded and cut into series sections, which were labeled by the improved strept-avidin-biotin complex DAB-nickel enhancer (SABC-DAB-Ni) immunohistochemistry and hematoxylin & eosin (H & E) stain techniques.Results The immunohistochemical results indicated that P450 2C-11 enzyme was localized in diverse numbers of neurons as well as some neuroglial cells, with focal or defuse distribution in many brain regions such as cerebrum, thalamus, olfactory bulb, hypothalamus, brain-stem, hippocampus, cerebellum, interpositus nucleus, caudate-putamen, and globus pallidus. In contrast, no positive findings of P450 4A-2, 3 and 8 enzymes were obtained in the same animals. With high magnification, 2C-11 protein was able to be roughly observed on the endoplasmic reticulum of the rat neurons.Conclusions P450 2C-11 protein, rather than P450 4A-2, 3 and 8, may be a candidate of brain P450 enzymes in the normal male rats.展开更多
目的观察二苯乙烯苷(TSG)对小鼠肝微粒体细胞色素P450(CYP)的影响。方法将昆明种雄性小鼠分为空白组、TSG低剂量组和TSG高剂量组,TSG灌胃3、5、7d后分别麻醉处死小鼠,取肝脏通过荧光实时逆转录聚合酶链反应(real time RT-PCR)检测小鼠...目的观察二苯乙烯苷(TSG)对小鼠肝微粒体细胞色素P450(CYP)的影响。方法将昆明种雄性小鼠分为空白组、TSG低剂量组和TSG高剂量组,TSG灌胃3、5、7d后分别麻醉处死小鼠,取肝脏通过荧光实时逆转录聚合酶链反应(real time RT-PCR)检测小鼠肝脏组织CYP相关基因mRNA的表达。结果 TSG作用第3、5、7天时均能够抑制CYP1A2和CYP3A4mRNA表达;TSG呈时间依赖性的增加CYP2E1mRNA表达;TSG作用7d能够显著抑制CYP4A14mRNA表达。此外,TSG对CYP2B10、3A11和3A25mRNA表达无显著性影响。结论 TSG对CYP1A2、CYP2E1、CYP3A4和CYP4A14有显著影响,对CYP2B10、3A11和3A25无明显作用。展开更多
文摘Monoclonal antibody (MAb) to rat liver cyto-chrome P-450j isozyme, an activating enzyme specific to nitrosamine metabolism, was used coupled with immunoblotting, densitometer scanning of SDS-PAGE gels and immunohistochemical technique. The trace P-450HSj isozyme (Mr. 51.5 Kd) was found in human gastric mucosa. It was similar to P-450j in molecular weight, catalytic and immunochemical properties. The concentrations of P-450HSj in mucosa of lesser curvature were higher than those in greater curvature. This might be one of the important reasons that lesser curvature is the commonest area for gastric carcinoma. But there was possibly less P-450HSj in gastric mucosa with cancer. Im-munohistochemically, P-450HSj was discovered in the cytoplasm of some glandular epithelial cells, especially in the glands with hyperplastic and intestinal metaplastic changes adjacent to carcinoma. It was also found in some normal glands and in tumor cells of high-differentiated adenocarcinoma, but not in those of low-differentiated ones. Following subjects are discussed: (1) the method of detecting trace P-450HSj, (2) the rule of distribution of P-450HSj, and (3) the relationship between the isozyme and the occurrence of gastric cancer caused by nitrosa-mines.
文摘Objective To localize cytochrome P450 enzymes 4A and 2C in central nervous cells of normal male rats.Methods Eight drug/alcohol untreated normal male rats (150-200 g of body weight) were treated by the optimized perfusion technique, then brain tissues were postfixed, paraffin-embedded and cut into series sections, which were labeled by the improved strept-avidin-biotin complex DAB-nickel enhancer (SABC-DAB-Ni) immunohistochemistry and hematoxylin & eosin (H & E) stain techniques.Results The immunohistochemical results indicated that P450 2C-11 enzyme was localized in diverse numbers of neurons as well as some neuroglial cells, with focal or defuse distribution in many brain regions such as cerebrum, thalamus, olfactory bulb, hypothalamus, brain-stem, hippocampus, cerebellum, interpositus nucleus, caudate-putamen, and globus pallidus. In contrast, no positive findings of P450 4A-2, 3 and 8 enzymes were obtained in the same animals. With high magnification, 2C-11 protein was able to be roughly observed on the endoplasmic reticulum of the rat neurons.Conclusions P450 2C-11 protein, rather than P450 4A-2, 3 and 8, may be a candidate of brain P450 enzymes in the normal male rats.
文摘目的观察二苯乙烯苷(TSG)对小鼠肝微粒体细胞色素P450(CYP)的影响。方法将昆明种雄性小鼠分为空白组、TSG低剂量组和TSG高剂量组,TSG灌胃3、5、7d后分别麻醉处死小鼠,取肝脏通过荧光实时逆转录聚合酶链反应(real time RT-PCR)检测小鼠肝脏组织CYP相关基因mRNA的表达。结果 TSG作用第3、5、7天时均能够抑制CYP1A2和CYP3A4mRNA表达;TSG呈时间依赖性的增加CYP2E1mRNA表达;TSG作用7d能够显著抑制CYP4A14mRNA表达。此外,TSG对CYP2B10、3A11和3A25mRNA表达无显著性影响。结论 TSG对CYP1A2、CYP2E1、CYP3A4和CYP4A14有显著影响,对CYP2B10、3A11和3A25无明显作用。
