目的探讨慢性间歇低氧(CIH)大鼠肺组织中磷酸化的蛋白激酶样内质网激酶(p-PERK)、CCAAT增强子结合蛋白(C/EBP)同源蛋白(CHOP)表达变化及意义。方法将60只大鼠随机分成正常组(UC组)、CIH组,每组各自分成3、7、14、21和28 d 5个时间亚组...目的探讨慢性间歇低氧(CIH)大鼠肺组织中磷酸化的蛋白激酶样内质网激酶(p-PERK)、CCAAT增强子结合蛋白(C/EBP)同源蛋白(CHOP)表达变化及意义。方法将60只大鼠随机分成正常组(UC组)、CIH组,每组各自分成3、7、14、21和28 d 5个时间亚组。采用HE法观察UC组和CIH组大鼠肺组织病理形态变化;采用免疫组织化学法检测p-PERK、CHOP蛋白表达及两者的相关性;采用逆转录-聚合酶链反应(RT-PCR)方法检测两组大鼠肺组织CHOP mRNA表达。结果 1CIH组肺泡壁及间质轻度水肿,少量炎症细胞浸润,肺泡结构紊乱,部分肺泡融合;UC组大鼠肺组织无明显病理变化。2CIH组肺组织p-PERK、CHOP蛋白表达高于UC组,于21 d表达最高。3CIH组肺组织CHOP mRNA表达高于UC组,于21 d表达最高。4P-PERK、CHOP表达的上调呈正相关。结论慢性间歇低氧可引起肺组织损伤,而p-PERK、CHOP蛋白的活化表达在慢性间歇低氧大鼠肺组织的损伤中可能存在一定的作用。展开更多
C / EBP is a sequence-specific DNA-binding protein. In order to indentify its distribution and localization, immunohistochemical technique (ABC method) was done using anti-C / EBP polypeptide antibodies 1103#, 425# in...C / EBP is a sequence-specific DNA-binding protein. In order to indentify its distribution and localization, immunohistochemical technique (ABC method) was done using anti-C / EBP polypeptide antibodies 1103#, 425# in liver specimens from 20 normal adults, 5 neonates, 6 patients with hepatitis, 25 with liver cirrhosis, 80 with hepatocellular carcinoma (40 cases were associated with surrounding nontumorous tissues) and 26 patients with cholangiocarcinoma (15 cases were associated with surrounding nontumorous tissues). The results showed that C / EBP was diffusely distributed in nuclei and cytoplasm of differentiated liver cells and very low or undetectable in liver cancer cells. The manifestation of C / EBP correlated with degree of differentiation of tumour cells, and was obviously weaker than that in surrounding nontumorous tussues. C / EBP positive staining has also been found in regenerating epithelial cells of bile ductules. The results suggested that C / EBP should play an important role in establishing and maintaining the differentiation of liver cells.展开更多
文摘C / EBP is a sequence-specific DNA-binding protein. In order to indentify its distribution and localization, immunohistochemical technique (ABC method) was done using anti-C / EBP polypeptide antibodies 1103#, 425# in liver specimens from 20 normal adults, 5 neonates, 6 patients with hepatitis, 25 with liver cirrhosis, 80 with hepatocellular carcinoma (40 cases were associated with surrounding nontumorous tissues) and 26 patients with cholangiocarcinoma (15 cases were associated with surrounding nontumorous tissues). The results showed that C / EBP was diffusely distributed in nuclei and cytoplasm of differentiated liver cells and very low or undetectable in liver cancer cells. The manifestation of C / EBP correlated with degree of differentiation of tumour cells, and was obviously weaker than that in surrounding nontumorous tussues. C / EBP positive staining has also been found in regenerating epithelial cells of bile ductules. The results suggested that C / EBP should play an important role in establishing and maintaining the differentiation of liver cells.
