大肠癌及正常肠黏膜组织中金属硫蛋白阳性表达的临床意义

目的:检测金属硫蛋白(MT)在大肠癌及正常肠黏膜组织中的表达,探讨MT在大肠癌组织中表达的临床意义。方法:对12例大肠癌新鲜标本采用RT-PCR方法检测MT在大肠癌及正常肠黏膜中的表达。对53例存档大肠癌石蜡组织标本采用免疫组化SABC法染色,结果按不同大肠癌肿块大小、组织分级、浸润深度及临床分期进行比较。所有病例随访6-48个月,分析MT表达与大肠癌患者生存、复发和远处转移的关系。结果:MT在大肠癌和正常肠黏膜组织中均有表达。MT阳性表达与大肠癌肿瘤大小、组织分级、浸润深度均无显著相关(P>0.05)。阳性表达者3年总生存率较阴性表达者低(62.5%比87.3%),但无统计学差异(P>0.05)。将37例完成术后辅助化疗者分为阳性表达与阴性表达两组比较,两组无病生存率(52.9%比64.7%)和无远处转移生存率(86.9%比91.3%)有显著性差异(均为P<0.05)。结论:大肠癌MT阳性表达与不良预后相关,可能与术后辅助化疗相对不敏感有关。     

Effect of methoxyethanol, cyclophosphamide and cadmium on metallothionein levels during prenatal development in the mouse

Three known teratogenic agents—methoxyethanol (ME), cyclophosphamide (CP) and cadmium (Cd)—are possible inducers of metallothionein (MT) in the embryo and/or in the fetus. Their effect on the MT levels of forelimbs, brain and liver during prenatal development and in dam's liver was studied in the mouse to elucidate whether MT could be used as an early biochemical indicator of teratogenicity. Pregnant mice were injected with 2 doses of each teratogen at different days of the middle gestational phase and their embryos and fetuses were obtained thereafter. Quantitative estimation of MT in the S9 from homogenates of the embryo/fetal tissues and organs and maternal liver showed major alterations in the dam's hepatic MT content but only small changes in prenatal MT levels. These results do not support MT as an early indicator of teratogenicity. However, a causal relationship between the maternal MT changes induced by the tested agents and their teratogenic effect could be possible.     

甲状腺疾病中金属硫蛋白的表达检测及生物学意义

目的探讨金属硫蛋白(MT)在不同甲状腺疾病中表达的检测及其生物学意义。方法应用免疫组织化学方法检测50例不同甲状腺疾病病理组织上MT的表达并比较其差别。结果MT在甲瘤、甲癌、Graves病和桥本甲状腺炎表达的阳性频度均为100%,甲癌中MT的AGV为87.60±9.20,明显高于甲瘤(62.20±12.40)、Graves病(61.10±13.20)和桥本甲状腺炎(58.50±10.60),P<0.05。结论MT与甲癌的发生发展关系密切,当AGA在80以上时,应高度警惕甲癌的可能。