NIK和IKKβ连接蛋白、C-myc和细胞周期蛋白D1在结肠癌组织中的表达及意义

目的检测结肠癌组织中NIK和IKKβ连接蛋白(NIBP)、磷酸化p65(p-p65)和C-myc、细胞周期蛋白D1(cyclin D1)的表达,并探讨其意义。方法收集广西医科大学第一附属医院结直肠外科2013年2月—2014年2月经外科手术切除及消化内科肠镜活检的部分标本151例,其中正常结肠黏膜16例、结肠腺瘤21例、结肠癌114例。采用SP免疫组化法分别检测正常结肠黏膜组织、结肠腺瘤组织及结肠癌组织NIBP、p-p65、C-myc和cyclin D1阳性细胞表达率;分析结肠癌组织中NIBP、C-myc和cyclin D1阳性细胞表达率与p-p65阳性细胞表达率的相关性。结果正常结肠黏膜组织、结肠腺瘤组织、结肠癌组织的NIBP、p-p65、C-myc和cyclin D1阳性细胞表达率比较,差异均有统计学意义(P<0.05)。结肠癌组织NIBP、p-p65、C-myc和cyclin D1阳性细胞表达率高于正常结肠黏膜组织和结肠腺瘤组织(P<0.017);正常结肠黏膜组织、结肠腺瘤组织中NIBP、p-p65、C-myc和cyclin D1阳性细胞表达率比较,差异无统计学意义(P>0.017)。不同组织学类型、浸润深度及有无淋巴结转移、远处转移患者结肠癌组织NIBP、p-p65、C-myc和cyclin D1阳性细胞表达率比较,差异有统计学意义(P<0.05)。分化程度越低、TNM分期越高、Duke's分期越高患者结肠癌组织NIBP、p-p65、C-myc和cyclin D1阳性细胞表达率越高(P<0.05)。NIBP、C-myc、cyclin D1阳性细胞表达率与p-p65阳性细胞表达率均呈正相关(P<0.05)。结论 NIBP可能通过激活核因子κB(NF-κB)信号转导通路上调C-myc和cyclin D1等的表达而影响结肠癌的治疗发生、发展、侵袭和转移,为临床发现结肠癌的治疗新靶点提供了参考依据。

Abrupt decrease of c-myc expression by antisense transcripts induces terminal differentiation and apoptosis in human promyelocytic leukemia HL-60 cells

This study was designed using c-myc antisense transcripts to evaluate how alteration of c-myc expression in human myeloid leukemic HL-60 cells could influence the myelomonocytic differentiation and induction of apoptosis. The recombinant plasmid pDACx expressing antisense transcripts to c-myc fragment containing a part of intron 1 and 137 nt exon 2 was constructed. pDACx was transfected into HL-60 cell line by lipofectin reagent.Cytochemical stainings including NBT reduction, peroxidase and α -NAE as well as detection of CD13 and CD33 antigens by flow cytometric analysis indicated occurrence of myelomonocytic differentiation in cells expressing antisense transcripts to c-myc. DNA degradation measured by DNA gel electrophoresis and typical morphological changes observed under electron microscope proved the switchon of apoptosis in terminally differentiating HL-60 cells.

外源性表皮生长因子治疗大鼠慢性胃溃疡对原癌基因表达的影响

目的通过观察外源性ＥＧＦ对大鼠实验性胃溃疡治疗后，对胃粘膜组织学及原癌基因ｃｍｙｃ基因及ｃｆｏｓ基因表达的影响，探讨ＥＧＦ在溃疡治疗中应用的可能性．方法乙酸烧灼法制备溃疡模型．术后次日１５只以西咪替丁１００ｍｇ／（ｋｇ·ｄ）ｓｃ治疗，６只以生理盐水治疗，１４只及１０只对照组大鼠以ＥＧＦ１０μｇ／（ｋｇ·ｄ）ｓｃ治疗，共４ｗｋ．于实验的１ｗｋ及１２ｗｋ分别处死动物，进行组织学及原位杂交检查．结果ＥＧＦ治疗后胃粘膜无异型增生出现．正常胃粘膜ｃｍｙｃ基因表达阴性，ｃｆｏｓ基因表达弱阳性；治疗１ｗｋ后的溃疡边缘ｃｍｙｃ基因、ｃｆｏｓ基因表达弱阳性．实验ｗｋ１２溃疡治愈后胃粘膜ｃｍｙｃ基因表达阴性，ｃｆｏｓ基因表达水平无升高．ＥＧＦ作用正常胃粘膜后，ｃｍｙｃ基因，ｃｆｏｓ基因表达水平无升高．结论外源性ＥＧＦ长期作用于正常及溃疡状态胃粘膜后。

Induction of Rat Prolactinoma by β－Estradiol and Its Relation to Expression of c－myc Oncogene

Sprague-Dawley rats were implanted with silastic capsules containing β-estradiol. After 60 days, their pituitary weights, serum prolactin contentsand transcription level of c-myc proto-oncogene were found increasedsignificantly. It was also found that the anterior pituitary cells proliferatedsignificantly, but their differentiation was suppressed.

In Vitro transformation of LW13 rat liver epithelial cells

A rat liver epithelial cell line designated LW13 was established using a sequential sedimentation method. The cell line retained many normal properties of liver epithelial cells and showed some structural and functional features resembling those of liver parenchymal cells. LW13 cells became malignant after the introduction of exogenous transforming EJ Ha ras gene. Tumors produced by inoculation of the transformed cells into baby rats .contained areas of poorly differentiated hepatocellular carcinoma. In situ hybridization analysis confirmed the random rather than specific integration of exogenous ras gene into host chromosomes. Furthermore , an at least tenfold increase in the expression of the endogenous c myc gene was detected among transformed cell lines, suggesting the involvement of the c myc proto oncogene in the in vitro transformation of rat liver epithelial cells by EJ Ha ras oncogene.

多态性上皮黏蛋白1和原癌基因C-myc在老年甲状腺乳头状癌患者中的表达

目的 探讨多态性上皮黏蛋白1 （mucin 1,MUC1）和原癌基因蛋白质（proto-oncogene proteins C-myc,C-Myc）基因在老年甲状腺乳头状癌（PTC）患者中的表达和临床意义. 方法 应用免疫组化法检测30例腺瘤旁正常甲状腺组织、35例结节性甲状腺肿和58例PTC标本中MUC1和C-myc的表达水平. 结果 MUC1基因在甲状腺癌中表达率为77.6％（45/58）,MUC1在有局部浸润和淋巴结转移患者中的检出率分别为90.0％（9/10）和88.2％（15/17）.C-myc基因在甲状腺癌中阳性率为81.0％ （47/58）;C-myc在淋巴结转移组中的检出率为100.0％ （17/17）. 结论 MUC1和C myc的阳性表达在甲状腺良恶性病变间有差异,并与甲状腺癌的转移有关.

Regulating Effects of Herb Cake-partitioned Moxibustion on the Expression of p53 and C-myc Protein in Rats with Ulcerative Colitis

Objective： To investigate the mechanism of herb cake-partitioned moxibustion treating ulcerative colitis （UC） from the relationship between expression of p53 and C-myc protein, and morbidity of UC. Methods： Rats model of UC was made with immune methods and local stimulation. Forty SD rats were divided into normal, model, herb cake-partitioned, and mild moxibustion group by a random number table, 10 rats in each group. Hanging moxibustion in the mild moxibustion group was applied to Tianshu （ST 25） and Qihai （CV 6） for 10 rain. Two moxa cones of herb cake-partitioned moxibustion were applied to the same acupoints respectively, in the herb cake-partitioned moxibustion group. Expression of p53 and C-myc protein was measured with immuno- histochemistical method in the colonic tissue of rats with UC. Results： Postive area, strength, and the immunohistochemistry index of the expression of p53 and C-myc protein were found more in the model rats than those in the normal rats （P〈0.01）, whereas less in the herb cake-partitioned moxibustion and mild moxibustion groups than those in the model group （P〈0.01）. Conclusion： p53 and C-myc play important roles in the morbidity and development of UC, and herb cake-partitioned moxibustion could regulate the expression of p53 and C-myc protein in the colonic tissue of UC rats.